In order to reduce the relative error in the calculation of the ultimate bearing capacity of ultra high span steel-concrete cable-stayed bridges and accurately analyze the stable state of the structure,this article proposes a nonlinear quasi-static modeling analysis method.Select design indicators that reflect structural stability and construct a vector of stability control indicators.By combining a simplified mechanical model with the maximum stiffness matrix,clarifying the critical conditions,a nonlinear quasi-static analysis model for the stability of cable-stayed bridges is established.Taking a large and ultra high span cable-stayed bridge as an example,the analysis model was used to obtain the following results:Column located on both sides of the cable-stayed bridge are in stable and unstable states,respectively,and Column located between the bridge spans gradually becomes unstable after reaching the critical stable state.The relative error of the ultimate bearing capacity calculated by this model is below 0.50,and the deviation from the true value is small,indicating that the constructed model can accurately calculate the ultimate bearing capacity of the structure and effectively analyze the stability of the structure.
关键词
大跨度/钢混结构/斜拉桥结构/非线性拟静态建模/稳定性分析
Key words
large span/steel concrete structure/cable-stayed bridge structure/nonlinear quasi-static modeling/stability analysis
维普
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