斜拉桥主塔塔型及塔高的优化分析  

Optimization Analysis on the Shape and Height of Main Tower in Cable-Stayed Bridge

作　　者：张文献[1] 王广涛 仝培周[1] 穆雅楠[1] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]中国核电工程有限公司河北分公司,河北石家庄050021

出　　处：《东北大学学报（自然科学版）》2011年第12期1770-1773,1781,共5页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(90915005);黑龙江省交通厅科研项目(311098)

摘　　要：塔型和塔高决定斜拉桥整体高度、施工难易和造价.利用MIDAS/Civil软件对某斜拉桥进行了数值模拟,以成桥恒载状态为基础,保持拉索和锚固形式及其锚固点分布基本不变,对3种塔型在恒载和地震荷载作用下的受力进行了分析,认为该桥主塔采用钻石型塔型最优.在成桥恒载作用下,对不同塔高的主梁和塔身的内力、位移以及斜拉索索力数值对比分析,提出了采用最小弯曲能量调整索力的方法来优化主塔高度,认为该桥塔高适当降低为优.The shape and height of the tower determine the height,the construction difficulty and the economical efficiency of the bridges.By using software MIDAS/Civil,this paper established spatial finite element model of whole bridge under the invariant cable and anchorage forms and the unchanged anchorage point distribution.The mechanical response of bridges with three tower shapes under the dead load and seismic load were analyzed,and it come to the conclusion that the diamond-type of tower is the optimal.Under the dead load of the finished bridge,the internal force and displacement of tower body,as well as the cable-force under the different tower heights of main girder were numerically analyzed.The least bending energy method is used to adjust cable tension in order to optimize the height of main tower,based on which,it is decided that the tower height of this bridge can be lower.

关 键 词：斜拉桥 主塔 塔型 塔高 优化分析 数值模型 

分 类 号：U446.2[建筑科学—桥梁与隧道工程]