Table of contents

The 2020 2nd International Conference on Structural Seismic and Civil Engineering Research (ICSSCER 2020) was planned to be held on December 11-13, 2020 in Zhengzhou, China. Currently, the entire world is struggling against the virulent pandemic COVID-19. Unfortunately, each of us is affected, either overtly or covertly. Our conference, 2020 2nd International Conference on Structural Seismic and Civil Engineering Research (ICSSCER 2020) was not an exception.

Nowadays, mass gatherings are not permitted by the government. It is uncertain when the COVID- 19 would end, so it remains unclear for postponement time, while many scholars and researchers wanted to attend this long-waited conference and have academic exchanges with their peers. Therefore, in order to actively respond the call of the government, and meet author's request, the ICSSCER 2020 which was planned to be held in Zhengzhou, China from December 11-13, 2020, was changed to be held online through Zoom software. This approach not only reduces people gathering, but also meets their communication needs.

List of Committee member, Conference Chair, Technical Committee, Organizing Committee and this titles are available in this pdf.

All papers published in this volume of IOP Conference Series: Earth and Environmental Science have been peer reviewed through processes administered by the Editors. Reviews were conducted by expert referees to the professional and scientific standards expected of a proceedings journal published by IOP Publishing.

• Type of peer review: Double-blind

• Conference submission management system: AI Scholar System

• Number of submissions received: 60

• Number of submissions sent for review: 57

• Number of submissions accepted: 32

• Acceptance Rate (Number of Submissions Accepted / Number of Submissions Received X 100): 53.3%

• Average number of reviews per paper: 2

• Total number of reviewers involved: 30

• Any additional info on review process:

• Step 1. Each of selected paper will be reviewed by two/three professional experts in the related subject area.

• Step 2. Review Reports received from the experts will be judged by one of the editors either Review Reports are logical or not?

• Step 3. If not logical, then editor can assign new reviewer or can also judge at his/her own.

• Step 4. If logical, then Review Reports will be sent to authors to modify the manuscript accordingly.

• Step 5. Authors will be required to revise their papers according to the points raised.

• Step 6. Revised version will then be evaluated by the editor for the incorporation of the points raised by the reviewers.

• Step 7. Then the editor will send the revised manuscript to the reviewers again for re-evaluation.

• Step 8. If the reviewers approve the revise version of the manuscript, then will be accepted for publication.

• Contact person for queries:

Xuexia Ye

publication@keoaeic.org

AEIC Academic Exchange Information Centre

This paper introduces the connection between construction management and BIM in large commercial complex projects. Through the technical means of BIM technology in construction site management, working face division, l design, steel structure deepening design, safety management, auxiliary simulation construction vehicle driving route, tower crane whole process management, etc. The purpose of shortening construction period, ensuring quality and quantity, ensuring safety and improving cooperation ability in the whole construction project is realized, and good economic benefit is obtained, and the application effect is remarkable.

Temperature and relative humidity affect the test of geomembrane. Here, using mathematical statistics, we analyzed the influence of temperature and relative humidity during state regulation and test on the results. The test data of geomembrane were obtained by changing the temperature and relative humidity ranging from 18°C to 25°C and from 50% to 70% respectively. Variation characteristics of discreteness and numerical value of test results with temperature and relative humidity are obtained by statistical analysis method. The results show that the influence of temperature and relative humidity on the test results stability is the change of numerical value and distribution characteristics. Under different temperature and relative humidity, the coefficient of variation of the test value of mass per unit area is 3.4% ∼ 4.1%, and the coefficient of variation of average value is 0.3%, which shows good stability; the coefficient of variation of thickness test value is 2.9% ∼ 7.0%, and the coefficient of variation of average value is 6.8%, and the value decreases with the increase of temperature.

Based on the investigation and analysis of the brick-concrete and single-story houses in a rural area of southern Guangxi, the author established four different overall models of single-story house according to a certain proportion by ABAQUS-a software of finite element analysis, so as to analyze the seismic response of brick-concrete and single-storey buildings in this area under the action of 6-magnitude frequent earthquake. The results show that, under the action of 6-magnitude frequent earthquake, if the single-storey and brick-concrete house is built without reinforced concrete, its wood beam support or column support cannot reduce the stress concentration of the structure obviously;the displacement deviation between the top and the middle of the outer wall can be reduced when the wood beam is used as the support between the inner wall and the outer wall.

In this paper, a static failure test was carried out on a confined concrete beam and a normal reinforced concrete beam. The theoretical and experimental bearing capacity of ordinary reinforced concrete beams and regional confined concrete beams are analyzed. The experimental and theoretical calculation results show that the regional confined concrete beam can effectively increase the bearing capacity of the beam without changing the section size. Since ordinary reinforced concrete participates in the compression zone in order to consider the compression zone, the calculation formula for regional confined concrete beams given in the code is conservative.

Due to many advantages, prefabricated buildings are the trend of future development. In order to study the mechanical properties of the steel structure beam-beam connection node, referring to related materials, this paper designs a bolted connection node between main and secondary steel beams. By changing the key parameters such as the thickness of the supporting plate and the diameter of the bolt, the finite element software ABAQUS is used to simulate the primary and secondary beam nodes. Based on the finite element results, the force mechanism, failure mode, flexural bearing capacity and rotational stiffness of the nodes are analyzed, and some parameter design suggestions are proposed: the thickness of the supporting plate should not be less than 8mm, and the bolt diameter should not be less than 20mm.

Dynamic triaxial tests are carried out on saturated expansive soil of Qinchong Road, Guangxi at different compaction degrees, numbers of reinforced layers, confining pressure, dynamic stress dynamic strain relationship, and dynamic modulus attenuation law under frequency combination to study the dynamic characteristics of reinforced saturated expansive soil under different influencing factors. Results show that the dynamic constitutive relationship of the saturated expansive soil when the loaded waveform is a half-sine wave conforms to the R. L. Kondner hyperbolic model; the dynamic elastic modulus decreases with the increase of dynamic strain, and the relevant fitting parameters are given. A dynamic elastic modulus attenuation model considering different degrees of compaction, numbers of reinforced layers, confining pressure, and frequency is proposed through regression analysis of the test results.

In filling engineering, the mechanical properties of geomaterials are the most important mechanical indicators. With the improvement of the measurement technology, the falling ball test (FBT) method has been gradually popularized and applied to the testing of geomaterials mechanical properties. In order to verify the testing accuracy of the FBT method, experimental results of the deformation modulus tested for the homogeneous fine-grained materials and the layered structures using the FBT method are compared with the K₃₀ plate load test, which is the earliest and the most widely used in-situ test method. And some conclusions are drawn in this present paper.

The protection and monitoring of subway tunnels have always been an important guarantee for the safe operation of urban rail transit. The current monitoring of tunnel deformation and convergence relies on traditional technology methods such as convergence meters and electronic total stations. Although the 3D laser scanning method of stationary station setup and station-to-station splicing of monitoring station is gradually becoming mature, the error accumulation and slow operation efficiency brought by station-to-station splicing are still the bottleneck of subway tunnel protection and monitoring. Based on the analysis of the principles and advantages of mobile 3D laser scanning technology, this paper deeply studies the mobile 3D laser scanning technology for rapid collection of point cloud data in subway tunnels, proposes an improved RANSAC algorithm based on the tunnel ellipse parameter model, and extracts metro tunnel deformation information through denoising and fitting of the tunnel cross section point cloud data, achieving convergence analysis of metro tunnel section. The results show that this method can quickly and accurately obtain tunnel section data, which provides a new and efficient technical approach for subway tunnel protection monitoring.

Based on the practical problems in the geological modeling of rail transit engineering in Chongqing, this study conducts a comparative analysis of the commonly use methods of engineering geological modeling. In view of the special geological conditions such as sand-mudstone interbedding and lens in mountainous cities, the problem of unified stratification of complex strata is solved by means of three-dimensional auxiliary layering and a process of three-dimensional modeling suitable for regular underground running tunnels and deep-buried underground running tunnels in mountainous cities is established.

In order to study the influence of the thickness of the rubber damping layer on the damping performance of the rock mass arch structure under explosive load, a finite element model was established based on the ANSYS/LS-DYNA dynamic finite element analysis software, and four rubber damping layers with different thicknesses of 0 m, 0.2 m, 0.4 m and 0.6 m are set between the rock mass and the lining. The fluid-solid coupling algorithm is used to compare and analyze the maximum effective stress, peak pressure and peak displacement of the outer lining dome, spandrel and arch foot elements. Numerical simulation results show that the maximum effective stress of the arch, spandrel and arch foot decreases after setting the vibration damping layer, and the arch foot reduces by more than 80%; with the increase of the thickness of the vibration damping layer, the peak pressure of the vault, spandrel and arch foot decreases, and the peak displacement increases. When the thickness exceeds 0.4 m, the damping and anti-blasting effect is not obvious, and the peak displacement tends to be stable; the vault is a strong response part, and reinforcement measures should be taken; comprehensive consideration of economic factors, it is recommended to set a 0.4 m thick damping layer.

The earthquake is an emergency with low probability and high risk. Constructing a real earthquake disaster scene can be used for earthquake emergency exercises, and timely inspection of escape, self-rescue and mutual rescue, and government decision-making deficiencies. Conducting the earthquake exercises under realistic conditions is not easily realized. Compared to the previous methods, the method based on virtual simulations is considered as one of the best effective ways. In this study, we employ the virtual simulations to construct earthquake disaster scenarios. The disaster scenarios immerse people in a virtual environment, where they learn to respond to earthquakes. We demonstrated the system architecture and its components, adopted 3dMAX and virtual simulations to reconstruct the modeling and reproduction of the regional topography, the city and the roads, bridges, hospitals, and building collapses in disaster areas. Virtual reality technology is used to realize the construction of the virtual city. Tests show that the system has good stability and effect, and reached the target set by the system.

Gravel materials are widely used in dam engineering in western China due to their excellent engineering characteristics such as high compaction density, high shear strength and strong water permeability. The compaction standard of gravel materials is evaluated by the relative density index. Therefore, after a reasonable compaction standard is determined, the next most critical link is the control of construction filling quality. Based on the results of field rolling tests, this paper analyzes the basic influence laws of gravel content, paving thickness, rolling times and water content on the compaction dry density and relative density of gravel materials, and studies the basic compaction characteristics of gravel materials, and determines the construction compaction parameters based on satisfying the design compaction standard. By controlling the gradation, rolling parameters and water content of dam construction gravel materials, the filling quality of dam construction can meet the design compaction standard, so as to ensure the safety and stability of dams.

A reciprocating force loading test was performed of a single-layer shear-yield eccentric brace frame specimen, and the finite element model of stiffeners of several energy-dissipating beam segments with different spacing is established. On the basis of verifying the validity of the finite element analysis, a non-linear numerical analysis of its hysteretic performance is performed, and the bearing capacity, initial stiffness, stiffness degradation and energy dissipation capacity of different model structures are analyzed. Studies have shown that appropriately reducing the spacing of the stiffeners in the energy dissipating beam segments can increase the load-bearing capacity, initial stiffness and energy dissipation capacity of the component, but the residual stiffness of the structure can be reduced.

According to the investigation of earthquake damages in China and abroad, the earthquake resistant behavior of frame shear wall structure is better than that of frame structure. Compared to the reinforced concrete fame shear wall structure, the fame structure is easier to be damaged under the action of earthquakes. In this paper, the five-storey frame structure model is taken as the research object, and a certain number of shear walls are reasonably arranged to form a frame shear wall structure to compare and analyze the earthquake resistant behavior of the two structures. The analysis results show that the frame shear wall structure can achieve good earthquake resistant behavior compared with the frame structure.

The manufacturing technology of SFRC segment is introduced. The main differences between SFRC segment and ordinary reinforced concrete segment are clarified. The cost norm of SFRC segment is established. By studying material and mechanical consumption in the production process of SFRC segment, the entire-cost of SFRC segment is obtained. Based on the production and application process of SFRC segment in the test section of Qingdao Metro Line 1, the engineering cost of SFRC segment and ordinary reinforced concrete segment were compared and analyzed.

In this paper, the finite element model of FRP reinforced concrete frame structure is established, and the seismic performance characteristics of CFRP bars and GFRP Bars concrete frame models are analyzed, such as stiffness degradation, strength attenuation, energy dissipation capacity, etc. The stiffness of CFRP reinforced concrete frame model is obviously greater than that of CFRP reinforced concrete frame model. The stiffness degradation curves of the two FRP reinforced concrete frame models are consistent, and the strength attenuation and energy dissipation capacity of GFRP reinforced concrete frame structure are better than that of CFRP reinforced concrete frame structure.

Based on the seismic simulation shaking table test of steel reinforced concrete frame model with special-shaped column, the lateral-torsional vibration response, dynamic eccentricity effect and nonlinear torsion response law of the model structure are studied. The results show that, under the action of three-way earthquake, the Y-direction and X-direction horizontal torsion coupling phenomena occur in the high-order vibration mode of the model structure, and the accidental eccentric torsion has a light influence on the seismic performance of the special-shaped column structure which does not exceed the height limit. The nonlinear torsion analysis shows that the inter-storey displacement angle of the model structure is affected by floor position, eccentricity and ground motion intensity. As the eccentricity and seismic intensity increases, the inter-storey torsion Angle of the model structure increases constantly. In case the relative eccentricity is less than or equal to 0.5 and the peak acceleration is less than or equal to 0.62g, then the amplitude of the inter-storey torsion Angle of the model increases slightly; In case the relative eccentricity is more than 0.5, then the lateral-torsional coupled effect of earthquake response of the structure is obvious, and the influence of eccentricity on torsion effect of the model structure is more obvious. The results show that steel reinforced concrete frame with special-shaped column has good ductility and torsion resistance.

In order to study the influence of steel tube diameter thickness ratio on the bearing capacity of steel tube angle steel tower joint, the finite element model of tube plate joint was established, and the failure mode and bearing capacity of the joint under different steel tube diameter thickness ratios were studied, and the influence law of steel tube diameter thickness ratio on the bearing capacity of steel tube tower joint was obtained, and the relationship between steel tube diameter thickness ratio and steel tube tower joint bearing capacity was established through regression analysis in this paper. The results show that angel steel tube plate K-type joint has two kinds of failure mode, and in a certain range, the bearing capacity of the joints increases with the increase of the steel tube diameter thickness ratio, and decreases after reaching the maximum bearing capacity.

Tunnel monitoring and measurement is the guarantee of tunnel construction safety and implementation of dynamic parameter design; relying on the surface settlement, vault settlement and convergence deformation in the tunnel during the construction of Da-Puling tunnel on Guangxi expressway, based on the monitoring data, the stress situation and deformation characteristics of the tunnel are analyzed; the results show that the construction parameters of Da-Puling tunnel are basically reasonable, and the portal section is the key to the control of the whole construction parameters, the settlement of the tunnel vault in the V-Class surrounding rock of the portal section is about 4 times of the convergence deformation, which is mainly caused by the gravity of the overlying soil layer. The settlement of the tunnel vault in the IV-class surrounding rock is close to the convergence deformation, and the stress release deformation in the loose area of the tunnel surrounding rock is the main one. The monitoring and analysis in the construction process provides reliable data for design and construction in time, and ensures the smooth progress of tunnel construction.

There are many other names for performance-based design, such as "performance based", "performance evaluation", "performance explicit standards" and "performance-based standards". The so-called "performance-based" refers to the performance specified in the specification or the performance proposed in the specification. When designing the design method, the specification only specifies the target performance, and leaves the checking method to the designer. In other words, performance-based design is a technology to set reliable performance goals and achieve them through reasonable structural analysis methods.

Recycled concrete is a product of the recycling of building materials. It has the characteristics of low cost and large demand, and its application in engineering is gradually expanding. However, there are still many unclear problems in the performance of recycled concrete in cold regions. In order to solve this problem, this paper puts forward the performance research of recycled concrete under low temperature condition, and designs the recycled concrete low temperature structure model through the ratio of recycled concrete materials and experimental construction. According to its indexes, the changes of its cryogenic antifreeze performance, compressive strength, stiffness stability and other aspects are compared and analyzed. The comparative experimental results show that when the air content of recycled concrete is gradually reduced, the insulation effect is reduced, the strength of recycled concrete is reduced, the frost resistance is also reduced, the durability and stability is poor, and the frost resistance is poor. With the continuous increase of displacement and load seismic force, the crack of recycled concrete gradually changes, the stiffness decreases faster, the stiffness degrades to a greater extent, and the low temperature seismic performance is poor.

Because of the rapidly increasing total electric load of buildings, effective electric load management should be achieved quickly. This can be realized via electric load forecasting. In this study, a novel clustering-based hybrid prediction model is proposed to predict the 24-daily electric load of buildings. In this study, fuzzy c-means (FCM) clustering, ensemble empirical mode decomposition (EEMD), and some intelligent prediction algorithms are combined. FCM is used to extract the daily data exhibiting similar features, whereas EEMD is used for breaking down the optimal prediction algorithm is selected for each component, and the prediction results are integrated. When compared with the remaining conventional prediction models based on real data, the proposed hybrid model exhibits higher prediction accuracy.

Using mathematical statistics, we analyzed the influence of temperature and relative humidity during test on the results. The test data of geomembrane were obtained by changing the temperature and relative humidity ranging from 18°C to 25°C and from 50% to 70% respectively. The results show that under different temperature and humidity, the coefficient of variation of the maximum tensile test value is 8.0%∼17.4%, and the coefficient of variation of average value is 6.7%, which is poor in stability; the coefficient of variation of the test value of elongation at break is 4.7% ∼ 11.7%, and the coefficient of variation of average value is 4.6%, and the value increases with increasing temperature; the coefficient of variation of right angle tear strength is 6.0% ∼ 20.7%, and the coefficient of variation of average value is 6.4%; the coefficient of variation of puncture strength test value is 4.2% ∼ 7.3%, and the coefficient of variation of average value is 6.1%, and the value decreases with the increase of temperature. These results will shed light on analyzing the influence of temperature and humidity on the mechanical test results of geomembrane and determining a reasonable temperature and humidity control range for geomembrane testing.

in order to study the mechanical properties of steel-concrete composite beams with asymmetric friction connections and considering the structural factors, three simple steel-concrete composite beams with friction connections were fabricated, and the uniaxial low cycle cyclic loading sine wave tests were carried out on the steel-concrete composite beams with friction connections. The test results show that the composite beam can get stable two-stage hysteretic curve in structure 1 and structure 3, and has reliable hysteretic energy dissipation capacity. The hysteretic curve of structure 1 is more full and stable, and the strength increases first and then decreases with the loading.

To investigate the dynamic characteristics of the horizontally encrypted column network spring vibration isolated turbine-generator foundation, according to similarity theory, a 10:1 scale model of the horizontally encrypted column network spring vibration isolated turbine-generator foundation, including two condensers, was tested on site, and the dynamic characteristics of the model are analyzed by excitation method, and the natural frequencies, mode shapes and damping ratio of the integral structure are acquired. This study shows that the first two mode shapes of the turbine-generator foundation are translation and torsion, the high mode shape is accompanied by column-end swing and local distortion; the condenser is more stable in the integral structure; the natural frequency of this foundation is higher than the dual-row column spring vibration isolated turbine-generator foundation, and it is significantly lower than rigid foundation, and the mode shape distribution is different from them.

In order to study the bearing capacity of flap gate under impact load, this paper uses the finite element calculation model to calculate the bending and shear resistance of the buttress of the flap gate under the design model, and designs the reinforcement amount of the section to study the bearing capacity of the flap gate under the impact load. The research result shows that the impact load controls the bearing capacity of the pier section, and the reduction of impact load can effectively alleviate the stress concentration at the corner of the pier. It is necessary to reconfigure the appropriate tension and compression reinforcement, but the stirrup and diagonal reinforcement do not need to be reconfigured.

As the last step of the project cost review, auditing plays a vital role in the entire project. It can not only make the project cost more accurate, but also bring some economic indicators to the entire construction industry. This article uses the game method to take the auditor as The center analyzes the pros and cons of the auditors and the reviewers during the audit, and proposes a series of balancing mechanisms based on the pros and cons of each party to alleviate the contradictions between the two parties. This article also analyzes the psychology of the game between the auditors and the leadership. It is hoped that various management and control will make the development of the engineering audit industry more stable.

In the process of orogenesis, the geological conditions of vertical strata were formed due to the intense compressive tectonic movement, and lithologic stratification occurred in the rock mass of the plant along the horizontal plane and vertically upstream and downstream. The main powerhouse of a power station straddles two types of rock formations along the axis. Considering the lithological differences between the two ends, traditional support methods will inevitably fail to meet the requirements of safety and economy. In this paper, under the condition of systematic bolt support for the whole plant, prestressed anchor cables are added to the upstream and downstream side walls of the plant in the type III surrounding rock area to increase the stability, and the anchoring effect is analyzed and compared with the calculation of the burrow. The results show that the deformation around the cave in the surrounding rock areas of type II and III under unsupported conditions differs by 31.48%, and the depth of the plastic zone in the surrounding rock area of type III exceeds the anchoring depth of the bolt; After partition support, The horizontal displacements of typical cross-sections in the two types of surrounding rock areas have decreased by 8.66% and 17.11% respectively, the stress distribution is more uniform, the distribution range of the plastic zone in the downstream wall of the plant is significantly reduced, and the stability of the surrounding rock is guaranteed.

Because of the randomness and uncertainties of earthquake and its structures, it is a natural choice to analyze and evaluate the risk of earthquake in the way of seismic risk analysis. Effective prediction of earthquakes can minimize property losses and protect citizens' safety. In this article, Bayes rule was used to make a simple prediction of the risk of a strong earthquake in a certain area. Then we conducted probabilistic seismic risk analysis (PSHA) to tackle the problem of a specific earthquake about where the earthquake will occur, how big the earthquake will be and when will the earthquake occur. Furthermore, we dived into spatial uncertainty, temporal uncertainty, and size uncertainty, respectively. Since earthquake intensity is significant for seismic vulnerability analysis, PGA (peak ground acceleration) was used as the index of earthquake intensity in this article. To be more specific, Wenchuan city in Sichuan province in China was chosen as the subject. Finally, seismic risk analysis was performed and the failure probability of the system was gained.

In recent years, viscous energy dissipation wall is widely used in China. In the case of a 5-story frame structure, the combination of viscous damping wall (VDW), buckling restrained brace (BRB) and (VDW + BRB) is used for seismic design. Under frequent earthquakes, (VDW + BRB) scheme has the best damping effect, which can effectively reduce the response of superstructure and greatly improve the seismic safety of building structures.

In this research, phosphogypsum composite cementing material using phosphogypsum powder, slag powder, fly ash and cement were prepared as the main cementing materials, and sodium silicate was used as the activator. The influence of the cement content of 0 wt.%, 5 wt.%, 10 wt.%, 15 wt.% and the change of 0%, 2%, 4% alkali equivalent on the mechanical properties of cementing materials was studied, the types and content of admixtures suitable for phosphogypsum cementitious materials were also studied. The cost of the materials used was calculated and analyzed. The results showed the increase in cement content and alkali equivalent will improve the mechanical properties of the cementitious material, and the strength can reach 23.0 MPa; the change of alkali equivalent had a more obvious impact on the early (1 d) mechanical properties of the cementitious material than cement; when these two factors synergistically worked, the cement content should not exceed 10 wt.%, or the mechanical properties of the material would decline; the effect of using the naphthalene-based water-reducing agent was better than that of the polycarboxylic acid water-reducing agent, and when cement, sodium silicate and naphthalene water reducer were used together, the maximum compressive strength of 7 d reached 24.4 MPa, which was higher than 39.4% of the sample without water reducer. The ratio used in the experiment was relatively low cost, which had a great reference value for the comprehensive utilization of industrial by-product phosphogypsum.

Secondary lining cracking always occurs in existing tunnels when the tunnel passes through the weathered argillaceous siltstone layer, which seriously affects the safety of the tunnel. In order to study the mechanical properties of weathered argillaceous siltstone and the cracking law of the secondary lining, this study analyzes the relationship of accumulative plastic strain between the dynamic stress amplitude and static deviator stress, as well as the cracking law of the secondary lining of the sample. The results show that under cyclic loading, there are obvious accumulative plastic strain in weathered argillaceous siltstone; the bearing capacity of the secondary lining structure at the biased part shows an evident increase than that of others with cracking generating faster. The research results provide a reference for the safety and operation of the tunnel that runs through the weathered argillaceous siltstone layer.