【摘要】 曲线梁桥兼具建筑美学以及能很好地适应地形、地物限制条件的优点,在国内外城市高架桥梁、立交工程及高等级公路中得到了广泛应用。然而,历次破坏性地震中,曲线梁桥屡有出现严重震害甚至垮塌的现象,表明其抗震设计问题迄今未得到很好的解决。本文以公路单跨混凝土曲线梁桥为研究对象,建立基准有限元模型,通过参数分析,系统研究了曲率半径、跨宽比、跨高比和跨径等主要设计参数对单跨曲线梁桥地震反应的影响规律,进而给出单跨曲线梁桥可采用"以直代曲"方法进行地震反应简化计算的条件,并提出适用于不规则单跨曲线梁桥地震反应的简化计算方法。更多还原

【Abstract】 The curved girder bridges are used widely in city viaducts,interchanges and hig h-grade highway in China and abroad for its structural advantages and architect ural aesthetics.However,severe damage even collapses of curved girder bridges were often occurred during the past damage earthquakes.This implies that the pr oblem of seismic design of curved girder bridges has not been solved perfectly. In this paper,the finite element model of a typical single-span concrete curve d girder bridge is built for numerical analysis.The parameter analysis method i s employed in the numerical analysis to study the effects of main design paramet ers,such as curvature radius,span-width ratio,span-depth ratio and span,on the seismic response of single-span curved girder bridges.The center angle li mits of a single-span curved girder bridge which can be seen as a regular bridg e are given.A simplified method for calculation the seismic response of a irreg ular single-span curved girder bridge is also proposed.更多还原