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| Application experimental study of high-strength lattice girders with heat treatment in tunnel engineering |
| TAN Zhongsheng
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| Application experimental study of high-strength lattice girders with heat treatment in tunnel engineeringTAN Zhongsheng(School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China |
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Abstract The heat treated-high strength steel bar have many advantages,such as high strength,good ductility,high strength ratio, good welding and cold bending performance, etc. It could effectively reduce the amount of steel bars and improve the project quality, and was successfully applied in civil engineering at home and abroad. However, the application of heat treated-high strength steel bar has limited study in the tunnel engineering. Based on the railway and highway tunnel construction, field tests of heat treatment high-strength lattice girders was carried out. By comparing the results, the supporting performance of high-strength lattice girders and I20b steel was analyzed. The result showed that settlement and convergence between high-strength lattice girders test section and I20b steel was reduced 7%~30%, and the surrounding rock pressure was close. But the steel stress of high-strength lattice girders was higher than I20b steel. Because of better combination between lattice girders and shotcrete, high-strength lattice girders ultimate bearing capacity was bigger than I20b steel, and steel material consumption of high-strength lattice girders was about 36% less than I20b steel. So high-strength lattice girders had good social and economic efficiency.
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Received: 27 November 2018
Published: 22 February 2019
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