桥墩类型对连续刚构桥抗震及稳定性影响分析

Influence of Pier Type on Seismic and Stability of Continuous Rigid Frame Bridge with Corrugated Steel Webs

为了研究不同的桥墩类型对连续刚构桥抗震及其稳定性的影响,以某实际工程波纹钢腹板连续刚构桥为研究对象,利用MIDAS-civil软件建立3种模型,进行时程分析和稳定性分析。结果表明:双肢空心薄壁墩的抗推刚度小,能增加墩的柔度,对抗震有利,但其稳定性差,且墩高越高,稳定性越差;箱型空心薄壁墩的抗推刚度大,其稳定性好,造价低,但对抗震不利。因此在墩高有差异时,矮墩可选用双肢空心薄壁墩,高墩可选用箱型空心墩。

In order to study the influence of different pier types on the earthquake resistance and stability of continuous rigid frame bridge,taking a practical continuous rigid frame bridge with corrugated steel webs as the research object,three models were established by Midas civil software for time history analysis and stability analysis.The results show that the anti push stiffness of the double leg hollow thin-walled pier is small,which can increase the flexibility of the pier,which is beneficial to the earthquake resistance,but its stability is poor,and the higher the pier height is,the worse the stability is;The box hollow thin-walled pier has a large anti push rigidity,good stability and low cost,but it is not good for seismic resistance.Therefore,when there is difference in pier height,the short pier can choose double limb hollow thin-walled pier and high pier can choose box type hollow pier.