中文摘要：

在已有的研究的基础上,针对单塔部分斜拉桥顺桥向地震作用下主梁的易损部位进行了研究.经分析,在顺桥向地震作用下,单塔部分斜拉桥易损性部位出现离塔第四根索到第五根索之间的近梁跨中段;地面运动加速度达到0.20g时,主梁有进入弹塑性阶段的概率,随地面运动加速度的增大,概率不断增大.

英文摘要：

This thesis would,based on the existing studies,conduct specific study on the vulnerability of the single-tower extra-dosed PC bridge’s beam.It reveals that the fragility position of partially cable-stayed bridge with single tower is locked closely to the midspan between the fourth and fifth cable under the action of earthquake along the longitudinal direction of bridge.The main girder is likelihood to reach the elastoplastic phase when the peak ground acceleration is up to 0.2g and the probability will increase as the peak ground acceleration increases.