设计参数变化对连续梁桥整体稳定性影响分析

Integral Stability Analysis of Continuous Girder Bridges Based on Variation of Design Parameters

为研究设计参数变化对连续梁桥整体稳定性的影响,基于有限元软件建立连续梁桥数值模型,模拟分析了不同坡度、支座横向间距、跨径及墩高条件下桥梁整体稳定性的变化规律.结果表明:增大连续桥梁的坡度会降低连续梁桥的整体稳定性;增大连续桥梁的支座横向间距能有效提高连续梁桥的整体稳定性;桥梁的整体稳定性与桥梁跨径的变化没有直接关系;考虑桥墩高度时,桥墩高度的增加对桥梁的整体稳定系数没有影响;不考虑桥墩高度时,各截点位置的桥梁整体稳定系数相对较大.

In order to study the influence of artificial design parameters on the overall stability of continuous beam bridge,the numerical model of continuous beam bridge is established by using finite element software.Under the conditions of different slope,transverse span of bearing,span and pier height,the variation rules of the overall stability of the bridge are simulated and analyzed.The study shows that:to increase the slope of continuous bridge will greatly reduce the overall stability of continuous beam bridge and the overall stability of continuous beam bridge can be improved effectively by increasing the transverse distance between the supports of continuous bridge.The overall stability of bridge has no direct relation with the change of bridge span.When considering the height of bridge pier,the increase of pier height will stabilize the whole bridge,while when the height of piers is not taken into account,the overall stability coefficient of the bridge is relatively large.