预应力钢板箍约束RC柱轴压性能数值模拟及试验验证  

BEHAVIOR OF RC COLUMNS CONFINED BY PRESTRESSED STEEL JACKETS UNDER AXIAL LOADING

作　　者：曾建宇[1] 郭子雄[2] 

机构地区：[1]同济大学土木工程学院,上海200092 [2]华侨大学土木工程学院,福建泉州362021

出　　处：《工程力学》2013年第2期203-210,共8页Engineering Mechanics

基　　金：国家自然科学基金项目(50978107;51178197);福建省自然科学基金项目(2010J01298)

摘　　要：为研究预应力钢板箍(Prestressed Steel Jacket,PSJ)约束下RC柱的轴压性能,分析施加横向预应力构件的轴压作用机理,建立了PSJ约束RC柱有限元模型,开展弹塑性数值模拟,并进行试验验证。结果表明,增大箍板预应力能减小约束RC柱竖向裂缝宽度,提高其轴压承载力,但可能减小约束柱的轴向峰值变形。箍板配箍特征值的增加能够显著提高约束RC柱的承载力和变形能力,并改善其破坏模式。由于箍板与RC柱外表面间空隙的存在,预应力钢板箍的拉应变增量要滞后于箍筋的拉应变。Numerical simulation and static loading test were carried out to investigate the compress resistant behavior of the RC columns confined by Prestressed Steel Jackets （PSJ）, and the transfer mechanism between PSJ and RC columns was analyzed. The results show that, with the augment of PSJ prestressing level, the maximum vertical crack width of confined columns decreases, and the axial compression bearing capacity of confined columns increases. However, the axial deformability of confined columns may be reduced at the same time. Axial compression performance of confined columns is enhanced as PSJ configuration parameter increases, which is followed by improved column failure mode. PSJ tensile strain increments lag behind the stirrup tensile strain due to the gap between PSJ and the outer surface of the RC columns.

关 键 词：RC柱 预应力钢板箍 数值分析 轴向变形 应变滞后 

分 类 号：TU398[建筑科学—结构工程]