钢-混凝土组合梁侧向稳定承载力

Lateral buckling elastic solution of steel-concrete composite beams acted onIts ends with an equal constant bending moment

鉴于钢-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,根据组合梁整体失稳的形式建立了2种失稳模型,并采用能量法对组合梁负弯矩区的侧向稳定性进行探讨,给出组合梁在弹性受力阶段临界弯矩的计算公式。与现有的方法相比较,给出的承载力计算公式具有更高的可靠性。

I-shaped steel beam＇s bottom flange is subjected to compressive force in negative bending regions of composite beams, so lateral buckling easily occurs without lateral bracing. Two models of lateral bucking were given on the basis of composite beams＇ buckling form, composite beams＇ lateral buckling was studied in negative bending regions by the energy method, and the formula which was used to calculate critical bending moment in the elastic stage was deduced. The formulas for beating capacity have the advantage of higher reliability and economical efficiency comparied with other methods.