钢筋混凝土梯形截面桁粱桥侧倾稳定性分析

LATERAL STABILITY ANALYSIS OF REINFORCED CONCRETE TRUSS BEAM BRIDGE WITH TRAPEZOID SECTION

摘要: 根据李国豪教授的桁梁桥挠曲扭转理论,针对钢筋混凝土梯形截面桁梁桥的侧倾稳定性进行了研究。基于结构体系的变分原理,本文导出了梯形截面桁梁桥侧倾失稳微分方程及相应的边界条件,通过采用伽辽金法得到了相应的侧倾失稳临界荷载q(cr),文末给出了一个实际工程算例。

Abstract: In this paper, the theory. of flexure and torsion for the truss beam bridge is adopted to drive differential equations of the elastic lateral stability for the truss beam bridge with a trapezoid section. The lateral stability of a simply supported truss beam bridge is analyzed by using the Galerkin's method. Finally the critical load q_cr for its lateral instability is obtained.