摘要
为克服钢筋混凝土墙肢底部易发生脆性破坏的缺点,提高联肢剪力墙结构的抗震性能,采用PEC剪力墙肢代替混合联肢剪力墙结构中的钢筋混凝土剪力墙肢,形成新型混合联肢PEC墙结构.通过改变钢连梁截面尺寸、PEC墙肢宽厚比以及楼层数形成3个系列共8个模型,研究了弹性耦连比和改变弹性耦连比的方式对混合联肢PEC墙结构滞回性能和应力分布的影响.结果表明:各个系列模型滞回曲线均饱满而稳定,未出现明显捏缩现象,证明混合联肢PEC墙结构抗震性能好、耗能能力强,适用于高烈度抗震设防地区;与已有联肢墙结构研究成果一致,弹性耦连比是影响混合联肢PEC墙结构整体性能的主要因素,并不会因为实现方式不同而影响结构应力分布规律;为保证结构达极限承载能力状态时各层钢连梁均发生剪切屈服并充分发展塑性,同时避免受拉侧墙肢发生延性较差的小偏心受拉破坏,应控制弹性耦连比小于等于70%;基于有限元模型分析结果,探讨了混合联肢PEC墙结构受力机理,建立了结构简化力学分析模型,给出了极限承载力计算公式;试验及有限元模型分析结果与理论计算结果误差在15%以内,且均为理论值偏低,证明本文提出的混合联肢PEC墙结构极限承载力计算公式精度较高且偏于安全,可用于计算结构极限承载力.
To address the shortcomings of reinforced concrete wall pier,which is prone to brittle shear failure at the bottom and to enhance the seismic performance of hybrid coupled walls,partially encased composite(PEC)wall piers are employed as a replacement of reinforced concrete wall piers.This resulted in the formation of a hybrid coupled PEC wall.A systematic study is conducted by varying steel coupling beam cross-sections,PEC wall pier widththickness ratios,and number of stories to form eight models of three series.This analysis examines the impact of elastic coupling ratios and the way of changing elastic coupling ratio on the hysteretic performance and stress distribution in hybrid coupled PEC walls.The findings reveal that the hysteretic curves of each series of models are full and stable,without significant pinching.This demonstrates that hybrid coupled PEC walls have good seismic performance and strong energy dissipation capacity,making them suitable for high-intensity seismic fortification zones.The elastic coupling ratio is the primary factor influencing the overall performance of hybrid coupled PEC walls and the way of changing elastic coupling ratio has minimal impact on stress distribution,aligning with existing research on coupled walls.To ensure that when the wall reaches the ultimate bearing capacity,all the steel coupling beams undergo shear yielding and fully develop plasticity,and at the same time,the small eccentric tensile failure with poor ductility is avoided in the tensile side wall pier.The elastic coupling ratio should not exceed 70%.Based on finite element model analysis,the force mechanism of the hybrid coupled PEC wall is explored,a simplified mechanical analysis model is established,and the calculation formula of the ultimate bearing capacity is provided.The discrepancies between experimental results,finite element model analysis results,and theoretical calculation results are below 15%,with theoretical values being lower.This demonstrates that the proposed formula for calculating the ulti
作者
周巧玲
赵仕兴
苏明周
石韵
周婷
Zhou Qiaoling;Zhao Shixing;Su Mingzhou;Shi Yun;Zhou Ting(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Sichuan Provincial Architectural Design and Research Institute Co.,Ltd.,Chengdu 610095,China;Department of Civil Engineering,Xi’an Shiyou University,Xi’an 710065,China;School of Architecture,Tianjin University,Tianjin 300072,China)
出处
《天津大学学报（自然科学与工程技术版）》
EI
CAS
CSCD
北大核心
2024年第2期186-200,共15页
Journal of Tianjin University：Science and Technology
基金
国家自然科学基金资助项目(51908461)
陕西省高校科协青年人才托举计划资助项目(20200426)
陕西省教育厅重点科学研究计划资助项目(22JT034)
住房和城乡建设部科技示范项目(2019-S-044).
关键词
PEC剪力墙
钢连梁
弹性耦连比
简化力学分析模型
极限承载力
PEC shear wall
steel coupling beam
elastic coupling ratio
simplified mechanical analysis model
ultimate bearing capacity
