【摘要】 为了研究桥墩布置形式对连续刚构桥地震响应的影响,以某弯连续刚构桥为例,采用通用有限元程序分析了5种不同的双薄壁墩间距对桥梁结构自振频率的影响,选取桥位场地人工合成地震波,对其进行了弹性地震响应分析。分析结果表明:当双薄壁墩间距在主跨径的1/20～1/25之间变化时,结构基频变化不超过5%,在地震作用下,主梁的弯矩、墩底弯矩及主梁位移最大变化不会超过12%,说明薄壁墩间距对结构自振频率及地震响应的影响不大,在初步设计阶段或进行弹性地震响应分析时,如果双薄壁间距在以上范围内变化,可以不考虑它对结构动力性能的影响。更多还原

【Abstract】 In order to study the effect of pier’s layout on the seisimic response of continuous rigid frame bridge,a curved rigid frame bridge was taken as an example,the natural frequencies of the bridge under five double-thin-wall distances were analyzed by finite element procedure,and artificial earthquake wave was employed to compute the elastic seismic response of the bridge.The result shows that when double-thin-wall distance lies between 1/20 and 1/25 of main span,the change of fundamental frequency is not more than 5%,and the seismic responses of the moments of girder and pier and the displacement of the superstructure are not more than 12%,which indicates that the natural frequencies and the seismic response of the structure are not sensitive to double-thin-wall distance.So during the period of primary design,the effect of double-thin-wall distance on the dynamic performance of continuous rigid frame bridge can be neglected if the bridge has ordinary double-thin-wall distance.3 tabs,6 figs,10 refs.更多还原