摘要
为控制某斜拉桥索塔横梁在采用先施工塔肢后施工横梁的异步施工工况下双向倾斜段塔肢的应力和线形,通过在索塔双向倾斜段设置主动横撑、将后施工的横梁采用等效荷载加载至塔肢上并采用Midas Civil有限元软件建模对索塔塔肢及横梁进行全过程施工阶段分析,对塔肢混凝土应力及变形进行控制。结果表明:相关措施可将混凝土拉应力有效控制在1.0MPa以内,变形控制在H/3000以内,不出现变形开裂、扭曲错位等现象。因此合理加载横梁等效荷载、设置主动横撑并采取顶推、锁定、预抬等措施,能有效保证索塔横梁异步施工工况下双向倾斜段塔肢的应力和线形。
In order to control the stress and linear shape of the bidirectional inclined cable pylon of the Mystic Valley Lancang River Bridge in Jinghong,Yunnan Province,under the asynchronous construction condition that cable tower limbs first and then the cross beam,setting the active transverse brace in the bidirectional inclined section of the tower,loading the cross beam to the tower limb with equivalent load,and using Midas Civil finite element software to analyze the whole construction stage of the tower limb and cross beam,the stress and deformation of the tower limb concrete were controlled.The results showed that the relevant measures can effectively control the tensile stress of concrete within 1.0MPa and the deformation within H/3000,without deformation crack,distortion and dislocation.Therefore,reasonable load of equivalent cross beam load,active cross brace and relevant measures,such as jacking,locking and pre-elevating,can effectively control the stress and linear of the tower limb in the bidirectional inclined section under the asynchronous construction condition of the tower beam.
作者
张平
李育文
路艳松
赵向坤
林珊
Zhang Ping;Li Yuwen;Lu Yansong;Zhao Xiangkun;Lin Shan(Yunnan Railway Group Co.,Ltd.,Kunming 650118,China;Civil Engineering College,Central South University of Forestry and Technology,Changsha 410004,China)
出处
《特种结构》
2023年第3期53-59,共7页
Special Structures
关键词
索塔横梁
异步施工
倾斜塔肢
应力
线形控制
Cross beam
Asynchronous const ruction
Tiling tower limb
Stress
Linear control
