竖向地震动对连续刚构桥受力影响分析  

Influence of Vertical Ground Motion on the Continuous Rigid Frame Bridge

作　　者：何伟[1,2] 刘鹏[3] 

机构地区：[1]四川建筑职业技术学院,四川德阳618000 [2]重庆交通大学,重庆400074 [3]西南交通大学,四川成都610031

出　　处：《工程抗震与加固改造》2016年第2期128-132,114,共6页Earthquake Resistant Engineering and Retrofitting

基　　金：四川省博士后基金资助课题

摘　　要：近断层地震动的一个明显特征就是可能会出现较大的竖向地震动,而规范对竖向地震动加速度峰值的规定没有考虑该情况,因此开展竖向地震动对连续刚构桥抗震性能影响的研究十分必要。本文以一座连续刚构桥为例,研究了竖向地震动加速度峰值与水平地震动加速度峰值之比分别为0.5、1.0、1.5、2.0、和3.0等5种情况时,结构的地震响应和桥墩损伤情况。从计算结果看以看到,在竖向加速度峰值较大时,边支座出现较大上拔力,桥墩可能出现轴向拉力,桥墩损伤情况随着地震动竖向加速度峰值与水平向加速度峰值之比的增大也有增加的趋势,这在进行设计时应给予足够的重视。An obvious characteristics of near-fault ground motion could appear large vertical ground motion. However,the situation had not to be considered in the specification. So it is necessary to study the influence of the large vertical vibration on the continuous rigid frame bridge. Based on a continuous rigid frame bridge as an example,influences of the vertical and horizontal ground motion acceleration peak value ratio（ 0. 5,1. 0,1. 5,2. 0,and 1. 5） on the bridge are analyzed. The results show that the side bearings could appear large pulling force and pier could arise axial tension when the vertical acceleration peak value is large. And the damage of piers is also an increasing trend with the ratio increasing. These issues require enough attention in the design.

关 键 词：近断层地震动 竖向地震动 连续刚构桥 纤维单元 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]