Experimental study on seismic performance of semi-rigid replaceable energy-dissipative high-strength steel column-base joint

被引：0
|
作者：
Li G. [1 ,2 ]
Wang S. [1 ]
Zhong Y. [1 ]
机构：
[1] College of Civil Engineering, Tongji University, Shanghai
[2] State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2023年 / 44卷 / 10期
关键词：
column-base joint; earthquake-resilient; high-strength steel; quasi-static test; seismic performance; semi-rigid;
D O I：
10.14006/j.jzjgxb.2022.0445
中图分类号：
学科分类号：
摘要：
The typical way to employ high-strength steel structures in seismic zone is using the 'strong-column-weak-beam' frame, namely, using high-strength steel and normal strength steel in columns and beams, respectively. However, the bottom section of the first-floor columns in a steel frame bears large loads and is thus easy to yield under an earthquake, which is unfavorable for the seismic performance of structures. Therefore, a novel semi-rigid replaceable energy-dissipative steel column-base joint was proposed in this paper, and two full-scale specimens were designed and prepared. Each of the two specimens was tested two times under low-cycle repetitive loads to investigate the energy-dissipative and recovery performance of the column-base joint, and further study was conducted to investigate the influence of the opening-shape and dissipative plate thickness on the seismic performance of the joint. The test results indicate that this column-base joint possessed rotation stiffness, and its load-resisting capacity and energy dissipation ability increase with the imposed displacement amplitude. Under a constant axial compression ratio of 0. 23, the tested joints exhibit a maximum moment-resisting capacity of 57% of the yield moment of steel column. The post-yield equivalent viscous damping factor is in the range of 0. 1 to 0. 22. Using a trapezoidal-opening in the covering plate can improve the stiffness and energy dissipation capacity of the joint but reduces its low-cycle fatigue performance. The failure modes of all tested energy-dissipative plate are characterized by the crack propagating at opening edges. Increasing the energy-dissipative plate thickness can improve the seismic performance of the joint. Except for the energy-dissipative plate, the remaining components keep elastic during the test, and the performance of the damaged column-base joint was repaired by replacing the energy-dissipative plates. © 2023 Science Press. All rights reserved.
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页码：26 / 37
页数：11
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