独柱墩桥梁抗倾覆稳定性分析

Analysis on Anti-overturning Stability of Single-column Pier Bridge

以某高速公路立交四跨一联独柱曲线连续箱梁桥为背景,基于《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG 3362-2018)对桥梁抗倾覆的相关规定进行研究。利用Midas Civil建立桥梁有限元模型,分析该桥的抗倾覆稳定性,并研究了联端支座间距、中支座外偏心距及温度效应对独柱墩桥梁倾覆稳定性的影响。结果表明,增大联端支座间距、设置合理中支座外偏心距可有效提升桥梁抗倾覆能力;温度效应在独柱墩梁桥抗倾覆设计验算中不可忽视。

Taking a four-span single-column pier curved continuous box girder bridge of expressway as the background,the related provisions of overturning resistance of bridge are studied according to Specifications for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts(JTG 3362-2018).Using Midas Civil to establish a bridge finite element model,the anti-overturning stability of the bridge is analyzed.The influences of joint-end support spacing,outer eccentricity of middle supports and temperature effect on the overturning stability of the single-column pier bridge are studied.The results show that the increase of the joint-end support spacing and the setup of reasonable outer eccentricity of the middle supports can effectively improve the anti-overturning capability of the bridge.And the temperature effect should be considered in the design and calculation of anti-overturning capacity of the single-column pier girder bridge.