薄壁花盆形托架的双幅四索面独柱多塔斜拉桥设计  

Design of Single-column and Multi-tower Cable-stayed Bridge with Double Deck and Four Cable Plane Based on Thin-walled Flowerpot Shaped Bracket

作　　者：袁微微 徐文平[2] YUAN Weiwei;XU Wenping(China Design Group Co.,Ltd.,Nanjing 210014,China;School of Civil Engineering,Southeast University,Nanjing 210096,China)

机构地区：[1]华设设计集团股份有限公司,南京210014 [2]东南大学土木工程学院,南京210096

出　　处：《现代交通技术》2021年第5期27-32,共6页Modern Transportation Technology

基　　金：江苏省自然科学基金项目(BK2012755)。

摘　　要：针对超长距离跨海大桥提出薄壁花盆形托架的双幅四索面独柱多塔斜拉桥的设计方案,采用单叶双曲面薄壁花盆形托架代替悬臂X形托架结构,薄壁花盆形托架顶部设置椭圆形托板以及环形排列支座,薄壁花盆形托架支撑斜拉桥双幅主梁,将主梁和索塔之间的相对转动自由度加以约束,提高多塔斜拉桥的刚度,降低不利布置活荷载作用下的中间跨主梁的竖向位移变形。结合200 m+2×420 m+200 m的双幅四索面多塔斜拉桥方案,进行工程参数设计,建立MIDAS有限元分析模型,开展动力模态分析研究,验证薄壁花盆形托架的双幅四索面独柱多塔斜拉桥设计的合理性。For the super long sea crossing bridge,the design of single-column and multi-tower cable-stayed bridge with double deck and four cable plane based on thin-walled flowerpot shaped bracket is proposed,which uses single leaf hyperboloid thinwalled flowerpot shaped bracket instead of cantilever X-shaped bracket structure.The top of the thin-walled flowerpot shaped bracket is provided with elliptical bracket and ring arrangement bracket,and the thin-walled flowerpot shaped bracket supports the double main beams of the cable-stayed bridge,which rotates the main beam and the pylon relatively.The stiffness of multitower cable-stayed bridge is improved and the vertical displacement and deformation of the main beam of the middle span under the unfavorable arrangement of live load are reduced by the restraint of the degree of freedom.Combined with the 200 m+2×420 m+200 m double deck and four cable plane multi-tower cable-stayed bridge,the engineering parameter design is carried out,the MIDAS finite element analysis model is established,the dynamic modal analysis research is carried out,and the rationality of the single-column and multi-tower cable-stayed bridge with double deck and four cable plane based on thin-walled flowerpot shaped bracket is verified.

关 键 词：独柱多塔斜拉桥 双幅四索面斜拉桥 海峡大桥 环排支座 薄壁花盆形托架 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]