Experimental study on seismic behavior of concrete-filled steel tube squat wall under high axial compression ratio

被引：0
|
作者：
Zhao Z. [1 ]
Fan G. [1 ]
He X. [2 ]
机构：
[1] Key Laboratory of Civil Engineering Safety and Durability of the Ministry of Education, Tsinghua University, Beijing
[2] Architectural Design and Research Institute, Tsinghua University, Beijing
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2020年 / 41卷 / 01期
关键词：
Concrete-filled steel tube squat wall; High axial compression ratio; Quasi-static test; Seismic behavior;
D O I：
10.14006/j.jzjgxb.2018.0110
中图分类号：
学科分类号：
摘要：
In order to improve the axial stability and the lateral deformability of the squat wall, the concrete-filled steel tube squat wall was proposed. Quasi-static tests of five concrete-filled steel tube squat walls with shear-span ratio 0.95 and high axial ratio (0.5) were carried out. The bearing capacity, deformability, failure modes and energy dissipation were studied. The strains of the reinforcement and steel tube were obtained. The main design parameters included the layout of steel tubes, axial compression ratio, shear connector type and braces between steel tubes. The test results indicate that before the peak load, the concrete-filled steel tube squat wall shows an obvious shear mode with a large number of shear diagonal cracks distributed along the web. After reaching the peak load, the damage tends to concentrate around the steel tubes. The failure mode of the slit wall is gradually formed, and the lateral deformability is obviously improved. When the test is finished, the concrete of the web has serious spalling. However, the concrete-filled steel tube squat wall still has favorable vertical and lateral stability.The drift ratio at the peak load is about 1/290-1/106, and the ultimate drift ratio reaches 1/70. The hysteretic behavior of the concrete-filled steel tube squat wall specimens is improved significantly. It can be concluded that the concrete-filled steel tube squat wall designed here have an excellent seismic performance and collapse prevention capacity. © 2020, Editorial Office of Journal of Building Structures. All right reserved.
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页码：33 / 41
页数：8
相关论文
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