钢筋混凝土柱剪切粘结破坏影响因素分析  

ANALYSIS OF THE INFLUENCING FACTORS FOR THE SHEAR-BOND FAILURE OF RC COLUMNS

作　　者：史庆轩[1] 王朋[1] 王秋维[1] 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《工程力学》2013年第11期136-142,179,共8页Engineering Mechanics

基　　金：国家自然科学基金项目(50978215;51108370;51178380);教育部高等学校博士学科点专项科研基金项目(20116120110004)

摘　　要：剪切粘结破坏是钢筋混凝土压弯构件一种常见的震害形式,剪切粘结破坏柱刚度退化快、延性差、滞回曲线"捏拢"现象明显、耗能能力差,因此,有必要进一步研究钢筋混凝土柱剪切粘结破坏的影响因素,以避免此类震害的发生。该文通过试验数据和有限元模拟分析了面积配箍率、混凝土强度、轴压比、剪跨比、纵筋直径及加载方式对钢筋混凝土柱破坏形态的影响,结果表明钢筋混凝土柱易于发生剪切粘结破坏的条件为:面积配箍率较大、混凝土强度等级较低、轴压比0.1≤n≤0.5、剪跨比1.25<λ<2.5、配筋率较大且纵筋直径较大、低周往复荷载作用。Shear-bond failure of reinforced concrete columns is a common form of the earthquake damage. And RC columns of this failure types have fast stiffness degradation, poor ductility. The hysteresis loops pinch obviously and the energy dissipation capacity is poor. Therefore, it is necessary to further research on the effect factors of shear-bond failure of reinforced concrete columns to avoid the occurrence of such damage. The effect factors on the failure modes of RC columns such as stirrup ratio, concrete strength, axial compression ratio, shear span ratio, the diameter of longitudinal bar and the loading mode are analyzed by the results of test and finite element simulation. The results indicate that the conditions of RC columns, which are easy to failure under shear-bond failure mode, are as follows： larger stirrup ratio, lower concrete strength grade, axial compression ratio 0.1 ≤n≤0.5, shear span ratio 1.25〈λ〈2.5, larger reinforcement ratio and reinforcement bar diameter and the cyclic loading.

关 键 词：钢筋混凝土柱 数值模拟 剪切粘结破坏 影响因素 柱粘结破坏判别式 

分 类 号：TU375.3[建筑科学—结构工程]