曲线梁桥地震响应的简化分析方法

曲线梁桥的平面不规则性引起的弯扭耦合效应,导致了地震响应的复杂性。对弹性支座上的刚性桥面系统建立了具有刚度偏心的简单曲线梁桥模型,给出了自振特性和地震响应的简化计算方法。通过数值模拟比较,系统地分析了各种影响因素及其对曲线梁桥动力响应的影响规律和计算图表,可以在抗震初步设计中参考使用。

SIMPLIFIED ANALYSIS METHOD FOR SEISMIC RESPONSE OF CURVED BRIDGES

A simplified bridge model suitable for parametric study of curved highway bridges with stiffness eccentricity is presented. The proposed model is simple, yet it captures essential features that affect the dynamic response of curved bridges. Using this simplified model, formulas for computing earthquake response of curved bridges are presented and parameters that significantly influence the dynamic response of curved bridges are identified. The study indicates that the response of a given curved bridge depends on the radius of the curved bridges, width of the deck and central angle of the curved bridges. The calculated results of natural frequencies for the proposed bridge system are illustrated in tables and diagrams. These results can be employed in preliminary seismic design.