等端弯矩作用下钢-混凝土组合梁侧向失稳的弹性解  

LATERAL BUCKLING ELASTIC SOLUTION OF STEEL-CONCRETE COMPOSITE BEAMS ACTED ON ITS ENDS WITH AN EQUAL CONSTANT BENDING MOMENT

作　　者：蒋丽忠[1] 李兴[1] 

机构地区：[1]中南大学土木建筑学院,长沙410075

出　　处：《工业建筑》2007年第z1期490-493,共4页Industrial Construction

基　　金：国家自然科学基金资助项目(50208018)

摘　　要：钢-混凝土组合梁在负弯矩作用下,组合梁中工字钢梁的下翼缘受压,在没有侧向支承的情况下,很容易出现整体失稳的现象。采用能量法对钢-混凝土组合梁负弯矩区的侧向稳定性进行了研究,并给出了组合梁在弹性受力阶段临界弯矩的计算公式。与现有方法相比,该方法具有更高的可靠性。I-shaped steel beam's lower flange is subjected to compressive force in negative bending regions of steel-concrete composite beams,so lateral distortion easily occurs without lateral bracing.It is studied steel-concrete composite beams'lateral buckling in negative bending regions by the energy method,and the formula which is used to calculate critical bending moment in the elastic stage is deduced.It has the advantage of higher reliability comparing with other methods.

关 键 词：钢-混凝土组合梁 负弯矩区 侧向失稳 临界弯矩 

分 类 号：TU398.9[建筑科学—结构工程]