基于屈服面的曲线梁桥地震动最不利输入方向

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振动与冲击 ›› 2013, Vol. 32 ›› Issue (3) : 115-118.

论文

基于屈服面的曲线梁桥地震动最不利输入方向

孟杰1 刘钊2

作者信息 +

Critical angle of seismic incidence for curved bridges based on yield surface

MENG Jie1, LIU Zhao2

Author information +

文章历史 +

摘要

曲线梁桥由于线形、刚度及质量的不规则分布，需要研究其地震动最不利输入方向。Bresler屈服面给出了钢筋混凝土构件在轴压力与双向弯矩组合作用下的截面屈服条件，本文据此将地震中桥墩截面最易发生屈服的方向定义为最不利地震动输入方向。在应用反应谱法得到两个正交方向地震反应的基础上，提出了基于Bresler屈服面的地震动最不利输入方向的一种新算法，该法考虑了水平面内双向地震动共同作用及曲线梁桥振型间的相关性。进一步，给出基于时程分析法的地震动最不利输入方向确定算法。最后，以某闭合圆环匝道桥为对象，分析了各墩的地震动最不利输入方向，同时验证了方法的准确性。

Abstract

Considering the irregular geometry, stiffness and mass distribution, the critical angle of seismic incidence for curved bridges is investigated. Allow for the yield condition for concrete structure under axial compression and bi-axial flexural moments being well depicted by the Bresler Yield Surface, the most vulnerable direction for piers is therefore defined as the critical angle of seismic incidence. Upon having the seismic response from two orthotropic directions by response spectrum analysis, a new algorithm is proposed in which multicomponent ground motion and correlation of natural vibration modes are considered. Further more, procedures for time history analysis are developed. Finally a worked example of a closed circular ramp is given to illustrate the validity of the method.

导出引用

孟杰刘钊 . 基于屈服面的曲线梁桥地震动最不利输入方向[J]. 振动与冲击, 2013, 32(3): 115-118

MENG Jie;LIU Zhao. Critical angle of seismic incidence for curved bridges based on yield surface[J]. Journal of Vibration and Shock, 2013, 32(3): 115-118