厝角头索塔下塔柱施工及温度应力分析  

Construction and thermal stress analysis of the lower pylon of Cuojiaotou cable tower

作　　者：丘燊 蔡小杨 李俊诺 王雷 QIU Shen;CAI Xiaoyang;LI Junnuo;WANG Lei(Guangdong Communication Planning&Design Institute Group Co.,Ltd.,Guangzhou 510507,China)

机构地区：[1]广东省交通规划设计研究院集团股份有限公司,广东广州510507

出　　处：《长沙理工大学学报（自然科学版）》2023年第2期146-156,共11页Journal of Changsha University of Science and Technology:Natural Science

基　　金：交通运输行业重点科技项目(2018-MS1-007)。

摘　　要：【目的】分析厝角头造型索塔的施工及温度应力,为该类索塔构造的设计施工积累经验。【方法】以主跨468.00 m的牛田洋大桥主桥为背景,建立三维局部有限元模型,采用静力分析和稳态热分析方法研究塔柱间板墩在不同施工方式及温度条件下的应力情况。【结果】板墩区域的受力主要取决于其浇筑成形后继续承受的荷载;移动荷载在下塔柱中主要产生纵桥向弯矩、轴力及扭矩,且纵桥向弯矩方向与恒载产生的弯矩方向相反,这对板墩结构受力有利;后浇带横向预应力可对板墩区域施加横桥向压力,在施工分界位置存在应力集聚情况;在下塔柱整体升降温条件下,板墩肋板与底座相接处、板墩与下塔柱相接处存在拉应力。【结论】在下塔柱板墩区域设置后浇带时,结构是安全的;当下塔柱板墩区域一侧在日照下升温5~30℃时,下塔柱拉应力均低于混凝土强度标准值2.74 MPa,因此不会引起下塔柱混凝土开裂。[Purposes]The stress characteristics of the Cuojiaotou style cable tower are analyzed to accumulate experience for the design and construction of this type of cable tower structure.[Methods]Taking the Niutianyang Bridge with a main span of 468.00 m as the background,this paper establishes a spatial local finite element model and uses the static analysis and steady⁃state thermal analysis methods to study the stress of slab piers between tower columns under different construction methods and temperature conditions.[Findings]The stress of the slab pier area mainly depends on the load that it continues to bear after casting.The moving load mainly produces the bending moment,axial force,and torque of longitudinal direction in the lower tower column.Moreover,the direction of the longitudinal bending moment is opposite to that of produced by the dead load,which is beneficial to the stress of the slab pier structure.The transverse prestress of the post⁃cast strip can exert transverse pressure on the slab pier area,and there is stress concentration at the construction boundary.Under the condition of overall temperature rise and decrease of the lower tower column,there are tensile stresses at the connection between the plate pier rib and the base,and the connection between the plate pier and the lower tower column.[Conclusions]The stress of the structure is safe when the post⁃cast strip is set in the slab pier area of the lower tower column.Considering a solar temperature rise of 5~30℃at one side of the slab pier area of the lower tower column,the tensile stress value of the lower tower column is lower than the concrete standard strength value of 2.74 MPa.Hence,the concrete cracking of the lower tower column is not caused.

关 键 词：斜拉桥 厝角头造型 下塔柱 温度效应 应力分布 

分 类 号：TU7[建筑科学—建筑技术科学]