摘要
郑万高速铁路跨郑西高速铁路为(32+138+138+32)m预应力混凝土独塔斜拉桥,主梁采用满堂盘扣支架法施工,斜拉索安装完成后平转至设计目标位置,施工难度大,控制风险高。针对其特点,通过方案比选,采用了盘扣式满堂支架结构形式。有限元全桥分析模型表明,主梁施工阶段,支架受力重分配,不利工况前端立杆轴力相对于浇筑阶段增加147%。支架有限元模型分析、现场变形与受力监测研究、反演分析表明,主梁与支架多层接触间存在相对滑动,摩擦系数接近多层之间的最小值。
The bridge of Zhengzhou-Wanzhou High Speed Railway across Zhengzhou-Xi’an High Speed Railway is designed as(32+138+138+32) m prestressed concrete single tower cable-stayed type. The main girder is constructed with full plate buckle scaffold method. After the cable is tensioned, it is leveled to the design target position. The construction of the bridge is difficult and the control risk is high. According to its characteristics, through comparison and analysis, the structural type of full plate buckle scaffold is designed. The finite element analysis model of the whole bridge shows that in the construction stage of the main girder, the force of the support is redistributed, and the axial force of the front end vertical bar under the unfavorable condition is increased by 147% compared with the pouring stage. The support model simulation, in-situ deformation, stress monitoring and back analysis show that there is relative slide between the main girder and the scaffold, and the friction coefficient is close to the minimum value between the multi-layer contact.
作者
郑建新
于哲
孙南昌
黄甘乐
ZHENG Jianxin;YU Zhe;SUN Nanchang;HUANG Ganle(CCCC Second Harbor Engineering Co.,Ltd.,Wuhan,Hubei 430040,China;Key Laboratory of Large-span Bridge Construction Technology,Wuhan,Hubei 430040,China;Research and Development Center of Transport Industry of Intelligent Manufacturing Technologies of Transport Infrastructurer,Wuhan,Hubei 430040,China;CCCC Highway Bridge National Engineering Research Centre Co.,Ltd.,Beijing 100120,China;CCCC Second Highway Consultants Co.,Ltd.,Wuhan,Hubei 430056,China)
出处
《施工技术（中英文）》
CAS
2021年第23期5-8,12,共5页
Construction Technology
基金
国家重点研发计划专项资助项目(2017YFC0805304)。
关键词
桥梁工程
斜拉桥
主梁
满堂支架
受力
变形
摩擦系数
有限元分析
bridges
cable stayed bridges
main girders
full scaffold
stresses
deformation
friction coefficient
finite element analysis
