解放大桥钢管混凝土系杆拱桥的非线性稳定

NONLINEAR STABILITY OF THE JIEFANGCONCRETE-FILLED STEEL TUBETIE-BAR ARCH BRIDGE

考虑拱肋初始挠度等缺陷的影响，采用杆系结构大位移分析的有限元方法，建立了拱桥非线性稳定的计算方法，并编制了相应的计算程序．文中计算了解放大桥钢管混凝土拱桥在施工阶段及成桥后运营期间的弹性侧倾稳定．结果表明：考虑拱肋初始挠度和结构大位移影响后，拱桥的非线性侧倾稳定安全系数比按线性稳定计算值低．

Accounting for the effects of imperfection and large displacement of arch, an approachfor the stability analysis of arch bridge is presented, and a program is developed to predict thenonlinear buckling of arch. The elastic lateral stability of the Jiefang Arch Bridge in Guangzhouduring the construction phases and operating periods after its completion is analyzed. The resultsshow that the effects of initial deflection and large displacements on the critical load of lateralstability are significant, and that once the initial deflection and large displacement are taken intoaccount, the values of the safety factor are smaller than those obtained by linear buckling analysis.