Increasing pile tension with CFRP reinforcement by load impact during pile driving with monitoring and GRLWEAP 2010

Pile driving by using piling device of drop hammer or diesel hammer models can induce damage of the capital of column. Excessive tension caused by pile driving can induce dynamic load on the capital of column continuously. Structural damage is influenced by the exhausting piling materials. The analysis on pile driving by using GRLWEAP 2010 software produces tension and hammer performance during pile driving. Maximum tension in the used piles was by choosing the type and the weight of the used hammers. This experiment used square piles of 20 x 20 cm with concrete quality of K-450, the weight of hammer was 1.6 tons with pile compressive capacity of 20.352 mPa. From the analysis with GRLWEAP 2010 software, it was found that the maximum tension was 26.883 mPa with ram stroke of 3 meters. In this test, the tension capacity during pile driving increased with the reinforcement on the structure which received tension during pile driving so that the pile capacity increased and reduced damages during pile driving. The reinforcement on the capital of column was temporary, only during the pile driving. The reinforcement on the capital of column was done by using Carbon Fiber Reinforced Polymers (CFRP), the type of sika®wrap 231C. The experiment of pile driving was done by conducting pile monitoring, using Pile Driving Analyzer (PDA) Test in order to find out the hammer performance and observing the capacity of piles without using any reinforcement and with using reinforcement. The structural behavior without using the reinforcement of capital of column indicated pile damage with ram stroke of 1.20 m; with the reinforcement of sika®wrap 1 layer the stroke was 1.90 m, and the reinforcement of sika®wrap 2 layers ram stroke was 2.80 m. The increase in the structural capacity toward tension during the pile driving with 1 layer of FRP was14.720% and with 2 layers of FRP was 51,776 %.