Experimental study on seismic behavior of steel-concrete composite columns under bidirectional loading paths

被引：0
作者：
Wang P. [1 ]
Shi Q. [1 ]
Wang F. [1 ]
Zhang T. [1 ]
机构：
[1] School of Civil Engineering, Xi'an University of Architecture & Technology, Xi'an
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2018年 / 39卷 / 01期
关键词：
Bidirectional loading; Coupling effect; High-strength concrete; Low cycle loading test; Seismic behavior; Steel-concrete composite column;
D O I：
10.14006/j.jzjgxb.2018.01.007
中图分类号：
学科分类号：
摘要：
The behavior of 8 steel-concrete composite columns was investigated experimentally under low cyclic loading. The effects of the steel configuration and loading path on the failure process, hysteretic characteristics, stiffness degradation, ductility and cumulative energy dissipation were studied, as well as the stress level of the longitudinal reinforcing bars and steel. The research results indicate that at the same steel ratio the deformation capacity of square steel tube reinforced concrete columns is better than that of cross steel reinforced concrete columns, and the ultimate failure drift ratio is increased by 24% approximately. Loading paths can affect hysteretic characteristics of the specimens significantly. Under asymmetrical loading path, hysteretic characteristics of the specimens are also asymmetry. Compared with specimens under unidirectional cyclic loading, specimens subjected to bidirectional cyclic loading have small peak load, fast stiffness degradation, small yielding displacement, poor ductility and small ultimate failure drift ratio. However, cumulative energy dissipation of specimens under bidirectional cyclic loading is larger than those under unidirectional cyclic loading. Longitudinal reinforcement yielding occurs before the peak load, while steel yielding occurs at the peak load. During late displacement loading, strain of longitudinal reinforcing bars and steel of bidirectional loading specimens increase faster than those of specimens subjected to unidirectional loading. Therefore, the bidirectional loading path has great influence on the seismic performance such as load carrying capacity, deformation performance and cumulative energy dissipation, which should be considered in the design. © 2018, Editorial Office of Journal of Building Structures. All right reserved.
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页码：52 / 60
页数：8
相关论文
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