摘要
为了明确双结合组合梁在中支点梁体顶升与回落过程的受力变化情况,以一主跨70 m的双结合组合梁为例,采用板壳-实体有限元模型分析浇筑底板混凝土和钢梁顶升的施工顺序对双结合组合梁负弯矩区受力性能的影响。计算结果表明:背景工程中采用先顶升钢梁再浇筑底板混凝土的方案增加底板混凝土受到的拉应力,但最大拉应力仅有1.2 MPa,不存在主梁回落时受拉开裂的风险。通过研究底板混凝土的厚度参数发现,双结合组合梁在顶升/回落过程中,底板混凝土的厚度对底板混凝土的受力影响较大,对混凝土桥面板和钢梁的受力影响很小。
In order to study the structural behavior of double-connected composite girder bridge with jacking-up the middle fulcrum method,this paper takes a double-connected composite girder bridge with a main span of 70mas an example to calculate the structural performance of the negative bending moment zone in the double-connected composite girder simulated by the shell-solid finite element model considering the construction sequence of casting the bottom concrete slab and jacking-up the middle fulcrum.The calculation result shows that the background project adopted to the scheme of jacking-up the middle fulcrum prior to casting the bottom concrete slab increases the tensile stress produced in the bottom concrete slab.However,the maximum tensile stress is only 1.2MPa,so there is no risk of cracking when the middle fulcrum falls down.By studying the thickness of bottom concrete slab,it is found that during the jacking-up and falling process of double-connected composite beams,the thickness of bottom concrete slab has great influence on the stress of bottom concrete slab,but little impact on the stress of concrete bridge deck and steel girder.
作者
周法根
邹迪升
陶仙玲
王伟群
ZHOUF agen;ZOU Disheng;TAO Xianling;WANG Weiqun
出处
《上海公路》
2022年第3期79-84,M0006,M0007,共8页
Shanghai Highways
基金
浙江省交通运输厅科技项目(No.2020031)。
关键词
桥梁工程
组合梁
双结合
顶升/回落
bridge engineering
composite girder
double-connected
jacking-up/falling
