新型复合结构拟静力试验的变形和裂缝  

Deformation and cracks on new compound structure under low-cycle and repeated load

作　　者：王新玲[1] 刘伟[1] 曹双寅[2] 

机构地区：[1]郑州大学土木工程学院,郑州450002 [2]东南大学土木工程学院,南京210096

出　　处：《东南大学学报（自然科学版）》2007年第6期1036-1040,共5页Journal of Southeast University：Natural Science Edition

基　　金：河南省自然科学基金资助项目(511050400);国家自然科学基金资助项目(50478050);河南省教育厅自然科学研究资助项目(200510459055)

摘　　要：针对用于代替粘土砖住宅结构的钢筋混凝土柔性梁柱加"人字"支撑形成的复合结构,采用1∶2的试验缩尺模型,根据抗震试验规程和理论计算的开裂荷载、屈服荷载及7,8和9度地震作用,设计出加载方案,进行了拟静力-低周反复荷载试验,研究该复合结构模拟地震作用下的刚度和裂缝.试验结果表明,该复合结构在水平低周反复荷载作用下,首先在2个支撑上出现多条较均匀的裂缝;然后梁截面和柱顶、底截面混凝土相继开裂.在水平力相当于9度多遇地震作用时,其裂缝最大宽度小于0.3mm、最大层间位移小于弹性层间位移限值,即复合结构满足正常使用极限状态的要求.引入了综合循环刚度的概念,绘出了刚度退化曲线,探讨了复合结构刚度及强度的退化规律.Experiment on new compound structure composed of reinforced concrete small beam and column and chevron ＂ A ＂ braces under low-cycle and repeated load were analyzed. 1 ： 2 scale model was adopted in the test. The loading process was designed based on code, calculating crack load, yield load and different grade of earthquake actions. The stiffness and cracks on the compound struc- ture were analyzed. The experimental results show that for the compound structure cracking first occurs at the braces sections and then beam and columns sections. The compound structure satisfies serviceability limit state under 9 degree small earthquake action. The concept of synthetically cycle stiffness is introduced. The curve of stiffness reducing is drawn and the rules of reduction of stiffness and strength are studied.

关 键 词：复合结构 低周反复荷载 裂缝 刚度 

分 类 号：TU375[建筑科学—结构工程]