支座的横向宽度对桥梁抗倾覆性能的影响研究

Research on the Influence of Lateral Width of Support on the Anti-overturning Performance of Bridge

现有规范较少考虑支座的横向宽度,通常将支座视为铰接点来处理,这可能导致抗倾覆稳定系数计算结果偏小。通过对温岭市西环路三联连续弯梁桥进行Midas Civil建模分析,探究支座横向宽度对桥梁抗倾覆稳定性的影响。研究发现,独柱墩支座有限度的抗扭能力对梁桥抗倾覆稳定性有较大影响,支座的横向宽度越大,可抵抗的扭矩也就越大,对梁桥抗倾覆稳定性的提升就越大;今后,独柱墩梁桥设计和在役桥梁加固分析工作可以适当考虑独柱墩支座的横向宽度对梁桥抗倾覆的有利影响,从而节约造价。

The lateral width of support is rarely considered in the existing specification.The support is usually regarded as the hinge joint for treatment,which may lead to smaller result in the calculation of anti-overturning stability coefficient.The influence of lateral width of support on the anti-overturning stability of the bridge is explored by making the Midas civil modeling analysis on the triple continuous curved beam bridge of the west ring road in Wenling city.The research shows that,the limited torsional resistance of single column pier support has a large influence on the anti-overturning stability of the beam bridge.The larger the lateral width of the support,the greater the torque it can resist,and the greater the improvement in the anti-overturning stability of the beam bridge;in the future design of single column pier beam bridge and the reinforcement analysis of the in-service bridge,the favorable influence of the lateral width of the single column pier support on the anti-overturning of the beam bridge can be appropriately considered,so as to save the cost of construction.