横向大跨度连续叠合梁施工阶段有限元计算分析  

Finite Element Calculation and Analysis in Construction Stage of Long-span Continuous Composite Crossbeam

作　　者：张煜 ZHANG Yu

机构地区：[1]上海市政工程设计研究总院(集团)有限公司,上海市200092

出　　处：《城市道桥与防洪》2020年第9期76-79,M0010,共5页Urban Roads Bridges & Flood Control

摘　　要：连续叠合梁中支点负弯矩是导致混凝土桥面板开裂因素,通过调整支座高度的施工方法可有效减小中支点负弯矩,增加混凝土桥面板压应力储备。中支点横梁构造根据支座的布置情况采用大跨度横梁体系。混凝土桥面板在该体系下呈拉-压双向受力的状态。结构复杂性及施工步骤对钢梁、混凝土桥面板的空间作用效应明显,应力状态较为复杂。采用全桥空间模型,对一联连续叠合梁进行施工全过程的计算分析,总结横向大跨度连续叠合梁中支点负弯矩区钢梁及混凝土桥面板的受力性能和特点。其成果为同类型连续叠合梁中支点大跨度横梁的设计提供参考。The center fulcrum hogging moment of continuous composite beam is a factor to cause the cracking of concrete deck slab.The center fulcrum hogging moment can be effectively decreased by the construction method of adjusting the height of support.The compressive stress reserve of concrete deck slab is increased.The long-span crossbeam system is used for the construction of center fulcrum crossbeam according to the layout of supports.The concrete deck slab presents the state of double-way stress of tension and pressure under this system.The structure complexity and construction steps have the obvious spatial effects on the steel girder and concrete deck slab.The stress state is more complex.The full bridge spatial model is used to calculate and analyze the whole construction process of continuous composite beam.The stress performances and characteristics of steel beam and concrete deck slab in the center fulcrum hogging moment zone of long-span continuous composite crossbeam are summarized.The achievements can be referred for the design of the long-span center fulcrum crossbeams of the similar continuous composite beams.

关 键 词：叠合梁 混凝土桥面板 大跨度横梁 施工阶段 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]