Experiment on the Seismic Behavior of Freeze-Thaw RC Shear Walls with Different Axial Compression Ratios

被引：0
|
作者：
Zheng S. [1 ]
Dong J. [1 ]
Rong X. [1 ]
Zhang Y. [1 ]
Dong L. [1 ]
机构：
[1] School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an
来源：
Tianjin Daxue Xuebao (Ziran Kexue yu Gongcheng Jishu Ban)/Journal of Tianjin University Science and Technology | 2019年 / 52卷 / 07期
基金：
中国国家自然科学基金;
关键词：
Axial compression ratio; Freeze-thaw cycle; Pseudo-static loading; RC shear wall; Seismic performance;
D O I：
10.11784/tdxbz201809026
中图分类号：
学科分类号：
摘要：
The freeze-thaw cycle test of four RC shear wall specimens with the shear span ratio of 2.14 was carried out by simulating the actual freeze-thaw environment of concrete structure with artificial climate rapid freeze-thaw technology. Then a quasi-static loading test was carried out using a cantilever beam loading scheme to investigate the influence of both freeze-thaw cycles and axial compression ratio on the seismic behavior of RC shear wall, that include bearing capability, deformation capacity, strength degradation, initial stiffness, stiffness degradation, and energy-dissipating capacity.The results reveal that the RC shear wall specimens subjected to freeze-thaw cycles suffered more serious damage than the intact specimen with the same axial compression ratio.Their initial stiffness, horizontal bearing capacity, deformation capacity, and energy dissipation capacity all showed different degrees of degradation.In addition, the strength attenuation amplitude, rate of stiffness degradation, shear deformation under different stress states, and ratio of shear deformation to total deformation under different loading conditions increased to varying degrees.When the number of freeze-thaw cycles is the same, with the increase in axial compression ratio, the crack distribution range, horizontal bearing capacity, initial stiffness, strength attenuation amplitude, and rate of stiffness degradation of RC shear wall specimens gradually increased, while the deformation capacity, energy dissipation capacity, and the shear deformation under different stress states decreased.The ratio of shear deformation to total deformation gradually decreased in the yield state, but it gradually increased and became the main deformation in the peak state.Considering the influence of freeze-thaw damage parameter D and axial compression ratio n on the peak load and ultimate displacement of RC shear wall, the calculation formula of RC shear wall peak load and ultimate dislacement correction factor that accounts for the influence of freeze-thaw damage was established by using multi-parameter fitting.This research can provide a reference for performance evaluation of in-service high-rise building structures using shear walls as the main lateral load resisting system in severely cold areas. © 2019, Editorial Board of Journal of Tianjin University(Science and Technology). All right reserved.
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页码：690 / 698
页数：8
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