吊拉组合体系桥施工过程抗风稳定性研究  

Wind stability of cable-stayed suspension bridges under construction

作　　者：张新军[1] 潘航滨[1] 

机构地区：[1]浙江工业大学建筑工程学院,浙江杭州310032

出　　处：《浙江工业大学学报》2011年第5期541-545,共5页Journal of Zhejiang University of Technology

基　　金：浙江省自然科学基金资助项目(502118;Y104577)

摘　　要：以某1 400m主跨的吊拉组合体系方案桥为工程背景,分别模拟主梁从两侧桥塔向中跨跨中对称拼装以及同时从两侧桥塔和中跨跨中开始最后在斜拉段与悬吊段结合处合拢的对称拼装施工的两种施工顺序,采用三维非线性空气静力和动力稳定性分析方法,分析了主梁拼装过程结构的动力特性、空气静力和动力稳定性的演变规律,并从抗风稳定性角度提出了吊拉组合体系桥适宜的主梁拼装施工顺序.结果表明:主梁采用从两侧桥塔向中跨跨中对称拼装施工顺序时,结构可以获得较大的自振频率,并具有较好的空气静力和动力稳定性,是吊拉组合体系桥一种适宜的主梁拼装施工顺序.Taking a cable-stayed suspension bridge with main span of 1400 meter as an example, under the construction sequences of the deck erected symmetrically from the pylons toward the midpoint of main span and simultaneously from the pylons and the midpoint of main span toward the junctions of the cable-stayed and suspension segments respectively, evolutions of structural dynamic characteristics, aerostatic and aerodynamic stability during the deck erection process are investigated numerically by 3D nonlinear aerostatic and aerodynamic analysis, and the favorable deck erection sequence is discussed with respect to the wind stability. The results show that the bridge has higher natural frequencies and better wind stability as the deck is erected simultaneously from the two pylons towards the midpoint of main span, which is considered to be favorable for cable-stayed suspension bridges.

关 键 词：吊拉组合体系桥 主梁拼装施工顺序 动力特性 空气静力稳定性 空气动力稳定性 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]