斜拉桥结构体系比选与优化设计  

Comparative Selection and Optimal Design of Cable-stayed Bridge Structure System

作　　者：许夏荧 陈杰 唐川 XU Xiaying;Chen Jie;TANG Chuan(Guangxi Baima Airport Expressway Co.,Ltd.,Nanning,Guangxi 530002,China;Guangxi Hetian Expressway Co.,Ltd.,Nanning,Guangxi 530002,China)

机构地区：[1]广西百马机场高速公路有限公司,广西南宁530002 [2]广西河田高速公路有限公司,广西南宁530002

出　　处：《黑龙江交通科技》2024年第6期67-70,共4页Communications Science and Technology Heilongjiang

摘　　要：为了研究斜拉桥结构体系差异对斜拉桥整体的结构受力特性影响规律,以六安市齐望路大跨度斜拉桥为工程背景,分别建立塔梁固结斜拉桥体系、塔墩梁固结斜拉桥体系和半漂浮斜拉桥体系,利用有限元软件建立不同斜拉桥结构体系模型,分别针对静力荷载作用和地震荷载作用下主梁、主塔和桥墩的内力进行分析。结果表明,在静力工况下当斜拉桥采用塔梁固结体系时,其主梁和主塔弯矩值均小于其他两种结构体系,在标准组合作用下结构主梁最大弯矩值最大减小了39.50%,主塔最大弯矩减小了65.08%;但采用塔梁固结体系斜拉桥主梁刚度反而有所下降,其中在汽车荷载作用下中跨跨中最大下挠达到了88.4 mm;在地震工况下塔梁固结体系主梁和桥塔受力更加有利。In order to study the influence of structural system differences on the overall structural mechanical characteristics of cable-stayed bridges,the large-span cable-stayed bridge of Qiwang Road in Lu'an City was taken as the engineering background,and the pylon beam consolidated cable-stayed bridge system,the pylon beam consolidated cable-stayed bridge system and the semi-floating cable-stayed bridge system were established,and the structural system models of different cable-stayed bridges were established by using finite element software.The internal forces of the main beam,tower and pier under static load and seismic load are analyzed respectively.The results show that the bending moment of the main beam and the main tower of the cable-stayed bridge under static condition is smaller than that of the other two structural systems.Under the action of standard combination,the maximum bending moment of the main beam and the maximum bending moment of the main tower are reduced by 39.50%and 65.08%respectively.However,the stiffness of the main girder of the cable-stayed bridge with the tower beam consolidation system decreases,and the maximum deflection of the mid-span reaches 88.4 mm under the action of automobile load.It is more advantageous to stress the main beam and the bridge tower under seismic conditions.

关 键 词：斜拉桥 结构体系比选 塔梁固结 塔墩梁固结 半漂浮 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]