钢-混凝土组合箱梁的侧向屈曲

The Lateral Buckling of Steel-concrete Composite Box-beams

本文通过对组合箱梁侧向失稳形式的理论分析,提出组合箱梁稳定性分析的计算模型,采用能量法对钢-混凝土组合箱梁负弯矩区的侧向稳定性进行探讨,推导在等端弯矩作用下组合箱梁在弹性受力阶段时的临界失稳弯矩计算公式,确定箱型组合梁负弯矩区稳定设计的修正方法和建议意见,通过研究对比表明本文提出的计算公式比现行组合梁的稳定理论和计算方法具有更高的可靠性和经济性。

Based on the theoretical analysis of steel-concrete composite box-beams＇ lateral buckling, computational model on the stability of composite box-beams are proposed. Based on this model, composite beams＇ lateral buckling was studied in negative bending regions by the energy method, and the formulas which are used to calculate critical bending moment in negative bending regions in the elastic stage are deduced. By comparison with other stability theories, this paper indicates the design correction and suggestion about the stability of composite box-beams in negative bending regions. Compared with other methods, the formulas have the advantage of higher reliability and economical efficiency.