刚构-单肋系杆拱组合桥梁空间非线性稳定分析

Three Dimension Nonlinear Stability Analysis of the Combinational Bridges with Rigid Frame and Single-ribbed Tied Arch

对刚构-单肋系杆拱组合桥梁的整体稳定性进行详细的数值分析,并与线弹性的计算结果进行对比。计算结果表明:刚构-单肋系杆拱组合桥梁的稳定问题已转化为考虑结构材料屈服强度的极限承载力问题,同时考虑结构几何非线性对稳定的影响亦不能忽略。

The stability is very important for the design and construction of the combinational bridges with rigid frame and single-ribbed tied arch. Based on the geometric and material nonlinearity of structure, the three dimension stability analysis of the cc^nbinational bridge with rigid frame and single-ribbed tied arch is performed on the base of the numerical analysis, and comparison of the linear and nonlinear results is done. The analysis results show that the stability of the combinational bridge with rigid frame and single-ribbed tied arch is actually the ultimate load carry capacity considering the yield strength of material and the effect of geometric nonlinearity on structure can not be ignored.