Behavior of cold formed steel sheet piles

• Main Author: Liu, Qiaoxia.
• Other Authors: Chiew Sing Ping
• Format: Final Year Project
• Language: English
• Published: 2013
• Subjects: DRNTU::Engineering
• Online Access: http://hdl.handle.net/10356/52804
• Institution: Nanyang Technological University

Steel sheet piles are heavily used in construction industry for the purpose of creating a barrier for earth and water pressure by driving it deep into underground through various driven method. Steel sheet pile are fabricated by either hot-rolled process or cold-formed process. In the past few decades, peoples usually adopted hot-rolled sheet pile for the construction purpose. However, with more and more country promoting less dependency on foreign workers and simplified construction method with better quality control, cold-formed sheet pile became popular in worldwide. Compared to hot-rolled sheet piles, cold-formed sheet piles have the advantage of lightweight, less cost, fast erection and easier construction. Whereas the cold-formed sheet piles are newly adopt in the construction market, there have no much research done to examine the performance of the cold-formed sheet piles and there is a concerned about the bending strength of cold-formed sheet pile. In addition, the cold-formed sheet pile adopted in the construction site will be used either as permanent application or temporary application. The steel sheet pile use as temporary application is often being pulled out afterwards and reuse, thus, there is raising concern regard about the slippage and effectiveness of the interlock of the cold-formed sheet pile. Therefore, this study aims to investigate the flexural behavior as well as the behavior of the interlock of the cold-formed steel sheet piles. In this final year project, flexural tests were conducted on a U-shape pile (OT18) and an Omega-shape pile (Omega 625-650) to investigate the behavior of sheet pile under loadings. Prior to the flexural test, a material test was conducted on three pieces of coupon specimen for each sheet pile to find out the actual yield strength of sheet pile. In this report, only the methodology of a flexural test on an OT18 sheet pile was presented with a comparison of the result of both U-shape and Omega-shape pile. Beside the flexural test, slippage test was also conducted to investigate the effectiveness of the interlock of cold-formed sheet pile. In this test, three specimens were used; the first specimen was a plain section interlock joint. The result obtained from this test was used as a benchmark. The second specimen was a welded interlock joint and the last specimen was an interlock joint filled with sand. A comparison of these three tests was present in this report.