钢筋混凝土框架梁拱效应的试验研究  

Experimental investigation on the arching action in reinforced concrete frame-beams

作　　者：苏幼坡[1] 王兴国[1] 宋晓胜[1] 陈明辉[1] 倪楠[1] 王宁[1] 

机构地区：[1]河北省地震工程研究中心,河北理工大学建筑工程学院,河北唐山063009

出　　处：《西安建筑科技大学学报（自然科学版）》2009年第4期477-484,共8页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50478114);河北省自然科学基金资助项目(E2005000446)

摘　　要：利用专门的试验装置进行了24个钢筋混凝土框架梁试验,对梁中拱效应进行了系统研究,得到了不同加载速度下梁中轴力、支座约束弯矩和荷载与挠度关系曲线.试验证明拱效应可显著提高框架梁的极限承载力,试验值与按塑性铰理论计算值比值的平均值为1.94.影响框架梁中拱效应的主要因素是纵向钢筋配筋率、跨高比和支座约束刚度,其中配筋率的影响最显著.快速加载情况下框架梁中拱效应与静载条件下相同,随加载速率提高承载力增加.To determine the effects of arching action in reinforced concrete frame-beams, 24 specimens were tested using the special equipment. Curves were obtained on the axial compress force in beams, beam end restrained moment and load with the midspan deflection under different loading velocities. It was proved that arching action can significantly enhance the load-carrying capacity of reinforced concrete frame-beams. The mean of the rate of experimental ultimate loads to the calculational ultimate loads based on the plast yield theory was 1.94. The main factors that affect the arching action were the percentage of steel reinforcement, the rate of clear span to overdepth and support stiffness. In these factors the effect of percentage of steel reinforcement was bigger. The behaviors of beams under fast loading and static loading were similar. And the ultimate load increased with increase in loading velocity.

关 键 词：拱效应 钢筋混凝土 框架梁 

分 类 号：TU371.102[建筑科学—结构工程]