考虑冻融损伤的钢筋混凝土框架节点恢复力模型研究

王斌; 郑山锁; 汪锋; 王帆

doi:10.6052/j.issn.1000-4750.2015.11.0913

考虑冻融损伤的钢筋混凝土框架节点恢复力模型研究

王斌^1,,
郑山锁²,
汪锋²,
王帆¹

1.
西安工业大学建筑工程学院, 陕西, 西安 710021;
2.
西安建筑科技大学土木工程学院, 陕西, 西安 710055

基金项目: 国家科技支撑计划基金项目（2013BAJ08B03）；教育部高等学校博士学科点专项科研基金项目（20136120110003）；陕西省教育厅科研计划项目（15JK1357）

详细信息

作者简介:
郑山锁(1960-),男,陕西渭南人,教授,博士后,博导,从事结构工程与工程抗震研究(E-mail:zhengshansuo@263.net);汪锋(1988-),男,山东济宁人,硕士生,从事结构工程研究(E-mail:wangfeng@126.com);王帆(1982-),女,陕西西安人,讲师,博士,从事结构工程研究(E-mail:ship_wang2955@163.com).

通讯作者:
王斌(1983-),男,陕西渭南人,副教授,博士,从事工程抗震及危险性评估研究(E-mail:wangbin1853@163.com).

中图分类号: TU375.4
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出版历程
- 收稿日期: 2015-11-15
- 修回日期: 2016-04-17
- 刊出日期: 2017-05-24

RESTORING FORCE MODEL OF FREEZE-THAW DAMAGED RC FRAME JOINTS

1.
School of Civil and Architecture Engineering Xi'an Technological University, Xi'an, Shaanxi 710021, China;
2.
School of Civil Engineering Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, China

More Information

Corresponding author:
WANG Bin: 10.6052/j.issn.1000-4750.2015.11.0913

摘要

摘要: 为了研究冻融环境下钢筋混凝土框架节点的抗震性能，对6个经受不同冻融循环次数作用后的钢筋混凝土框架节点进行低周反复加载试验，分析框架节点的滞回曲线特性。基于试验结果，得到了简化三折线型骨架曲线模型，并给出了相应的确定方法。采用回归分析方法，得到考虑冻融损伤的钢筋混凝土框架节点的极限功比系数I数学表达式，进而确定基于循环耗能的循环退化指数，通过对构件在反复荷载作用下的屈服荷载、硬化刚度、卸载刚度以及承载力等各项力学性能的退化机理进行了描述，进一步建立适应于冻融损伤的钢筋混凝土框架节点的恢复力模型，并给出了具体的滞回曲线规则。研究表明：冻融作用使得节点梁纵筋粘结性能劣化明显，累积耗能随着冻融循环次数的增加而降低；通过考虑刚度、强度的循环退化规律能更好的反应冻融节点“捏缩”效应，更与实际吻合；建议的恢复力模型与试验结果想接近，可为该类结构的弹塑性时程分析提供理论参考。
- 钢筋混凝土 /
- 框架节点 /
- 冻融损伤 /
- 滞回特性 /
- 恢复力模型
Abstract: To research the aseismic behavior of reinforced concrete (RC) frame joints damaged by freeze-thaw cycling, the hysteretic behavior of 6 RC frame joint specimens were investigated experimentally, which have been damaged by the freeze-thaw cycles under low cyclic reversed loading. Based on the test results, a trilinear skeleton curve model of frame joints was established, and the key parameters of the skeleton curve were determined. The limiting work ratio I of RC frame joints was expressed through regressive analysis, which considered freeze-thaw damage. The cyclic degradation indexes of RC frame joints based on freeze-thaw damage was proposed, so as obtained to describe the degradation law of specimens' mechanical properties such as yield load, hardening stiffness, unloading stiffness. And then, a restoring force model of RC frame joints based on freeze-thaw damage was established. The specific hysteretic rule was developed. The results show that the bond performance degradation of longitudinal reinforcements of a joint beam is obvious under the freeze - thaw, that the cumulative energy dissipated is decreased as the increase of cyclic numbers of freeze-thaw, and that the effect of pinching is affected by considering stiffness and strength reduction, which can well reflect the practical purpose. The study results will shed light on the theoretical research about the elastic-plastic dynamic analysis of RC structures.
- reinforced concrete /
- frame joints /
- freeze-thaw damage /
- hysteretic behavior /
- restoring force model

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参考文献(16)

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施引文献(7)

期刊类型引用(5)

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2.	王燕，徐善华，李安邦. 冻融损伤钢筋混凝土柱恢复力模型研究. 工业建筑. 2022(08): 97-102 . 百度学术
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4.	李逸，李升才，朱永甫. 不同轴压比带楼板RCS梁柱组合件恢复力模型. 地震工程与工程振动. 2021(02): 199-210 . 百度学术
5.	郑山锁，郑跃，董立国，江梦帆，张晓辉，可亮. 酸雨环境下锈蚀RC剪力墙恢复力模型研究. 工程力学. 2019(10): 75-85 . 本站查看