摘要
设计了5个钢筋混凝土核心筒试件并进行了拟静力试验,对其开裂过程、屈服顺序、滞回性能、耗能能力、承载力、延性、变形能力、刚度退化、截面应变及剪力滞后等进行研究,得到了试件开裂、屈服直至破坏时的荷载,分析了核心筒的破坏机理和较大塑性变形区域受力情况,研究了试件高宽比、连梁纵筋配筋率、连梁跨高比及加载角度等因素对核心筒的破坏模式、承载力、延性、耗能能力和剪力滞后的影响。研究结果表明,高宽比对核心筒结构的承载力和变形性能有较大影响,并决定着核心筒的破坏模式;过度增大连梁纵筋配筋率在提高侧向承载力的同时降低了试件的延性;增大连梁跨高比可以显著提高核心筒的侧向刚度和承载力,但也严重影响了试件开裂后的性能,变形能力较差;不同加载角度的侧向力改变了整个核心筒的受力承载模式,各墙肢积极参与受力,空间效应明显,增大加载角度仍可获得较好的滞回性能。
The pseudo-static test of five reinforced concrete core wall specimens were carried out.The cracking process,yielding sequence,hysteretic behavior,energy dissipation capacity,bearing capacity,ductility,deformation performance,stiffness degradation,section strain and shear lag phenomenon of core walls were investigated.The cracking,yielding and ultimate loads were obtained.The failure mechanisms of core walls and force distribution in large plastic deformation regions were also analyzed.The influences of the height-width ratio,reinforcement ratio of coupling beam,span-depth ratio of coupling beam and loading direction on the failure mode,bearing capacity,ductility,energy dissipation and shear lag of core walls were studied systemically.The test results indicate that the ratio of height to width not only has effect on the bearing capacity and deformation,but also determines the failure mode of core walls.The bearing capacity of core walls increases and displacement ductility reduces with the excessive increase of reinforcement ratio of coupling beams.The lateral stiffness and strength of core walls can be improved while the deformation capacity and the behavior after cracking can be affected adversely with the significant increase of the span-depth ratio of coupling beams.The bearing mode of core walls can be changed by altering of the lateral loading direction,resulting in the increased force area of wall piers due to the obvious spatial effect.A better hysteretic behavior of core walls can be obtained with the increase of the loading angle.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2011年第10期119-129,共11页
Journal of Building Structures
基金
国家自然科学基金项目(507781495
0978215)
陕西省教育厅专项科研项目(2010JK625)
关键词
钢筋混凝土核心筒
拟静力试验
破坏模式
滞回性能
抗震性能
reinforced concrete core walls
pseudo-static test
failure mode
hysteretic behavior
seismic behavior
