摘要
提出了一种塑性可控的钢制连接装配式剪力墙,将结构的塑性损伤与破坏集中在钢制连接件上,主体结构基本保持完好,能够改善钢筋混凝土剪力墙的破坏模式,避免罕遇地震作用下剪力墙在墙体底部发生严重塑性损伤,提高剪力墙的震后可恢复性。对高宽比为1.0的现浇剪力墙、塑性可控的钢制连接装配式剪力墙及更换损伤钢制连接件的装配式剪力墙进行了拟静力试验研究,考察其破坏形态、抗剪承载力、滞回性能、耗能能力等抗震性能指标。结果表明:钢制连接装配式剪力墙的破坏集中在钢制连接件上,墙体损伤程度明显减轻,具有较高的抗剪承载力,其变形能力和等效黏滞阻尼系数均可达到现浇剪力墙相应值的2倍,损伤钢制连接件更换前后试件的总耗能分别为现浇剪力墙总耗能的5.23倍和4.55倍;位移角达到3%时,上部墙体出现细微裂缝,但钢筋未发生屈服,保持较好的完整性,钢制连接件的耗能占总耗能的89.2%以上,实现了结构的塑性耗能集中控制。更换损伤连接件后的装配式剪力墙可获得与原试件相接近的性能指标,表明更换损伤的钢制连接件可较快恢复剪力墙的力学性能,塑性可控的钢制连接装配式剪力墙具有较好的可恢复性。
A plasticity-controlled steel connected precast shear wall is proposed,which can concentrate the damage and failure to the steel connectors while the main reinforced concrete(RC)wall remains in good condition.The proposed precast shear wall can improve the failure mode of traditional RC wall,avoid the severe plastic damage at the base of wall under rare earthquake and enhance the post-earthquake resilience of RC shear walls.A set of pseudo-static loading tests were carried out on a cast-in-place shear wall,a plasticity-controlled steel connected precast shear wall and a repaired steel connected precast shear wall to study the failure modes,shear resistance,hysteresis behavior as well as energy-dissipation capacity,etc.Results showed that the failure of the proposed precast shear wall was mainly located in the steel connectors,and damage on the precast RC wall was obviously reduced.The proposed precast shear wall developed sufficient shear resistance,the deformation capacity and the viscous damping coefficient were two times of those of cast-in-place shear wall.The total energy dissipation of the specimens before and after replacement of damaged members was 5.23 times and 4.55 times that of the cast-in-place shear wall,respectively.The precast RC wall cracked slightly without reinforcement yielding at the drift of 3%and remained in good condition,and the steel connectors consumed up to 89.2%of the total dissipated energy,indicating that the proposed precast shear wall achieved plastic energy dissipation control.The mechanical behaviors of repaired precast shear wall by replacing damaged steel connectors were close to that of the original precast shear wall.It indicates that the proposed precast shear wall can restore seismic capacity quickly by replacing damaged steel connectors and the plasticity-controlled steel connected precast shear walls has good structural resilience.
作者
刘如月
王昊
颜桂云
陈亚辉
余勇胜
LIU Ruyue;WANG Hao;YAN Guiyun;CHEN Yahui;YU Yongsheng(Fujian-Taiwan Cooperative Institute of Civil Engineering Technology in Universities of Fujian Province,Fujian University of Technology,Fuzhou 350118,China)
出处
《建筑钢结构进展》
CSCD
北大核心
2023年第7期1-11,共11页
Progress in Steel Building Structures
基金
国家自然科学基金(51878174)
福建省自然科学基金(2020J05185)
福建省建设厅科技研究开发计划项目(2022-K-302)。
关键词
塑性可控
装配式剪力墙
钢制连接件
震后可恢复性
抗剪性能
拟静力试验
plasticity-controlled
precast shear wall
steel connector
post-earthquake resilience
shear behavior
pseudo-static loadingtest
