高强混凝土偏心受压柱中焊接环式箍筋的约束作用研究  

Research on confinement effect of welding ring stirrups in eccentrically loaded high-strength concrete columns

作　　者：李升才[1] 章炯[1] 

机构地区：[1]华侨大学土木工程学院,泉州362021

出　　处：《建筑结构》2013年第10期71-75,共5页Building Structure

基　　金：国家自然科学基金项目(50948036);福建省自然科学基金计划项目(E0810022);福建省科技计划重点项目(2012H0028)

摘　　要：以偏心距为主要控制参数,对两组共6个密置焊接环式复合箍筋约束高强混凝土柱进行大、小偏心受压静力加载试验研究和有限元数值模拟对比分析。研究结果表明,焊接环式箍筋的约束作用可以较大地提高高强混凝土偏心受压柱的极限承载力、延性性能和受压区混凝土的极限压应变,对改善柱的受力和变形性能、提高结构的抗震性能具有重要意义。建议考虑密置焊接环式复合箍筋对混凝土的约束作用,适当修改规范中偏心受压柱极限承载力计算公式。Using eccentricity as the main controlling parameter,two groups of six high-strength concrete columns confined by closely arranged welding composite ring stirrups were researched under large eccentric and small eccentric compression static loading tests,and comparative analysis of the columns by finite element numerical simulation was performed.The research results show that ultimate bearing capacity,ductility and concrete ultimate compressive strain of eccentrically loaded high-strength concrete columns are greatly improved by confinement effect of welding ring stirrups,which has great significance to improve the mechanical behavior and deformation property of columns,as well as the seismic performance of the structure.It is recommended to consider the confinement role of the closely arranged welding ring stirrups and appropriately adjust the ultimate bearing capacity calculation formula of eccentric compression column in the code.

关 键 词：高强混凝土偏心受压柱 焊接环式箍筋 约束作用 承载力 延性 

分 类 号：TU317.1[建筑科学—结构工程] TU398