大跨度钢管混凝土拱桥施工稳定性分析

阐述了钢管混凝土拱桥稳定性的计算方法,然后根据江西吉安赣江大桥分析了钢管混凝土拱桥施工过程的线性和非线性稳定性,得到了各个施工阶段的稳定安全系数。分析结果表明,在钢管中混凝土已经灌注但是还没有形成强度的时候,整体稳定性最低;当混凝土刚度形成以后,整体稳定性最高;成桥以后,因为自重增加,稳定性略有降低;考虑非线性,尤其是材料非线性以后,稳定安全系数降低较大,因此,在施工过程的稳定性分析中应该考虑非线性的影响。

Analysis of stability of long-span concrete filled steel tube arched bridge in construction

The two methods for stability analysis,i.e.,the linear and nonlinear buckling analysis,were introduced.Then according to Jiangxi Ji'an Ganjiang concrete-filled steel tubular arch bridge,some aspects about stability were discussed.The results show that the coefficients of stability are smaller when the concrete is filled but not frozen and coefficients of stability increase when the concrete in the tube is frozen;the nonlinear must be considered in the analysis of stability of CFST arch bridge in construction;the material nonlinear has a greater influence than the geometrical nonlinear on the stability of the bridge.