Restoring force model of corroded RC columns with bending failure considering damage effects

被引：0
|
作者：
Shang Z.-G. [1 ,2 ]
Zheng S.-S. [1 ,2 ]
Zheng H. [3 ]
Jiang Y.-Z. [4 ]
Dong J.-Q. [1 ,2 ]
机构：
[1] School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an
[2] Key Lab of Structural Engineering and Earthquake Resistance, Ministry of Education（XAUAT）, Xi’an
[3] School of Combat Support, Rocket Force University of Engineering, Xi’an
[4] China Qiyuan Engineering Corporation, Xi’an
来源：
Zhendong Gongcheng Xuebao/Journal of Vibration Engineering | 2023年 / 36卷 / 02期
关键词：
chloride erosion; damage model; RC frame column; restoring force model; seismic behavior;
D O I：
10.16385/j.cnki.issn.1004-4523.2023.02.008
中图分类号：
学科分类号：
摘要：
To meet the needs of elastic-plastic analysis of reinforced concrete（RC）structures induced by chloride erosion，an accel⁃ erated corrosion test is conduct on six RC frame column specimens. Then，quasi-static tests are carried out. The apparent damage of corroded steel bars is observed under artificial climate environment. The influence of corrosion level and axial compression ratio on failure pattern and seismic behavior of the specimens is analyzed. Based on the test results，a double parameter damage model is used，and the value of the model parameters is defined. Then，the damage development law of corroded RC frame columns is quan⁃ titatively disclosed. Furthermore，a skeleton curve model of the RC frame columns is established by combining theoretical analysis with experimental regression. The model considered the influence of corrosion and axial compression ratio. The cyclic degradation index based on damage is introduced. The hysteresis rules reflecting the performance degradation in four stages of loading，unload⁃ ing，reloading and declining are proposed. Then a restoring force model of corroded RC frame columns with bending failure is es⁃ tablished and the accuracy is verified. The error of the calculated skeleton curve and the test skeleton curve is less than 10%，and the error of the calculated and test energy dissipation is within 20%. Since the linear characteristic of the calculated reloading curve，there is an obvious error of the reloading stage. However，the calculated hysteretic curves are in good agreement and have small er⁃ rors on the whole with the experimental results，indicating that the established restoring force model can accurately reflect the seis⁃ mic behavior of corroded RC frame column with bending failure. © 2023 Nanjing University of Aeronautics an Astronautics. All rights reserved.
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页码：369 / 378
页数：9
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