摘要
为了探究复杂多维地震作用下带翼缘剪力墙的损伤机理和抗震性能,进行了5个T形截面RC剪力墙的水平单、双轴拟静力试验,研究双轴加载对T形墙破坏模式、滞回性能、承载力、延性与耗能能力的影响,考察T形墙在不同双轴加载路径下的受力机理和多维抗震性能。结果表明:T形墙在单、双轴加载下的破坏均发生在墙肢自由端底部,双轴加载加剧了裂缝的开展和混凝土的剥落,且对翼缘的损伤影响更大;T形墙两正交方向的受力行为存在明显的相关性,双轴耦合受力产生的内力重分布和局部附加应力会改变T形墙的局部受力机理和整体性能,表现为一个方向受荷时,其正交方向在位移不变的情况下荷载会产生突变;相较于单轴加载,双轴加载下T形墙各方向承载力平均降低了6.90%,极限变形能力平均降低了11.28%,单个方向破坏时的累积耗能减小,且双轴耦合效应按“十”字形、“8”字形、矩形加载路径的顺序依次增强。鉴于地震动的随机性以及结构响应的多维耦合性会显著改变带翼缘RC剪力墙在实际地震作用下的抗震能力,建议在剪力墙结构抗震设计时合理考虑承载力的折减并适当减小层间位移角限值。
To study the damage mechanism and seismic behavior of shear wall with flange under a complex multidimensional earthquake,the uniaxial and biaxial quasi-static tests of five T-shaped reinforced concrete shear walls were carried out.The effect of biaxial loading on the failure mode,on the hysteretic behavior,on the bearing capacity,on the ductility and on the energy dissipation capacity of T-shaped walls were investigated,and the force mechanism and multidimensional seismic behavior of T-shaped walls under different biaxial loading paths were also analyzed.The research results show that the failure part of T-shaped RC walls under both uniaxial and biaxial loadings are concentrated at the bottom of the free end of wall segment.Biaxial loading aggravates the crack development and concrete spalling,and it has a greater impact on flange damage.There is an obvious correlation of the mechanical behavior of T-shaped wall between its two orthogonal directions.The internal force redistribution and local additional stress generated by biaxial loading would change the local stress mechanism and overall performance of T-shaped wall,that is,when the loading in one direction,the force in the orthogonal direction would change under a constant displacement.Compared with uniaxial loading,the bearing capacity under biaxial loading is reduced by 6.90%on average,the ultimate deformation capacity is reduced by 11.28%on average,the cumulative energy consumption in single direction is decreased,and the biaxial coupling effect increases with the loading paths alternating from cruciform to eight-shaped to rectangular.Due to the randomness of ground motion and the multidimensional coupling of structural response will significantly change the seismic capacity of RC wall with flange under a real earthquake,it is suggested to rationaly consider the reduction of bearing capacity and appropriately reduce the inter-story drift ratio limit in the aseismic design of shear wall structures.
作者
王斌
吴梦臻
史庆轩
蔡文哲
王朋
WANG Bin;WU Meng-zhen;SHI Qing-xuan;CAI Wen-zhe;WANG Peng(State Key Laboratory of Green Building in Western China,Xi’an University of Architecture&Technology,Xi’an,Shaanxi 710055,China;School of Civil Engineering,Xi’an University of Architecture&Technology,Xi’an,Shaanxi 710055,China;School of Urban Planning and Municipal Engineering,Xi’an Polytechnic University,Xi’an,Shaanxi 710055,China)
出处
《工程力学》
EI
CSCD
北大核心
2023年第7期145-157,共13页
Engineering Mechanics
基金
国家自然科学基金项目(51808435,51878540)
陕西省自然科学基础研究计划项目(2022JQ-392)
西部绿色建筑国家重点实验室自主研究课题项目(LSZZ202221)
西部绿色建筑国家重点实验室开放基金项目(LSKF202212)。
关键词
T形截面
RC剪力墙
拟静力试验
双轴加载
耦合作用
加载路径
抗震性能
T-shaped section
reinforced concrete shear wall
quasi-static test
biaxial loading
coupling effect
loading path
seismic behavior