Seismic performances of fabricated circular steel tube confined concrete piers
OU Zhijing1，YAN Jianhuang1，YU Jie1，LIN Shangshun1，QIN Zhiqing2
1. College of Civil Engineering, Fujian University of Technology, Fuzhou 350118, China;
2. Fujian Communications Planning & Design Institute Co., Ltd., Fuzhou 350004, China
Abstract：In order to study the seismic performance of the fabricated circular steel tube confined concrete piers, the quasi-static test study was conducted on the three pier specimens with the constraint mode and connection mode as the parameters, and analyzes the failure mode of the bridge pier specimen, including the seismic performance of structural ductility, energy dissipation capacity, stiffness degradation, residual displacement, etc. The finite element model is established using the ABAQUS general program and performs finite element parameter analysis. The test results show that the failure modes of the prefabricated circular steel tube confined concrete pier specimens are basically the same, all of which are compression-flexuring failures. Compared with the traditional prefabricated concrete pier (T-8), the horizontal peak load of the prefabricated circular steel tube confined concrete pier specimens has increased by 30.0% and 53.9%, the displacement ductility coefficient has increased by 52.4% and 67.5%. Compared with the circular steel tube confined concrete pier connected with grouting sleeve, the hysteretic curve of the prefabricated circular steel tube confined concrete pier connected by hybrid joint (grouting sleeve and steel tube shear connector combination) is more full, higher energy dissipation capacity，and smaller residual displacement, the horizontal peak load increased by 18.4%, and the displacement ductility coefficient increased by 9.9%, showing good seismic performance. Under the conditions of different axial compression ratio, slenderness ratio and concrete strength, the circular steel tube confined concrete piers connected by hybrid joints are superior to the traditional grouting sleeve connected circular steel tube confined concrete piers in terms of horizontal peak load and displacement ductility.
Keywords：bridge Engineering; circular-steel-tube-confined; prefabricated pier; steel tube shear connector; seismic performance；skeleton curve
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