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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第13卷    第1期    总第70期    2016年1月

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文章编号:1672-7029(2016)01-0089-07
先简支后连续T梁桥全过程力学行为及极限承载力分析
朱小青,陈代海,陈淮

(郑州大学土木工程学院,河南郑州 450001)

摘 要: 为研究先简支后连续T梁桥从施工至极限破坏的全过程受力性能,以河南省省道S318线西张村大桥为工程背景,运用有限元软件midas/FEA建立同时考虑几何非线性和材料非线性影响的全桥三维实体模型,分别在6种工况下进行了仿真分析研究。研究结果表明:桥梁达到极限承载力时,偏载工况下的活荷载系数小于相应对称荷载工况下的活荷载系数;偏载工况下边梁相应的支座截面底部混凝土先被压碎,对称荷载作用下,受荷位置主梁相应关键截面顶板的混凝土先被压碎;预制主梁上缘的混凝土先于湿接缝处的混凝土达到极限应力状态,二者受力不同步。

 

关键字: 先简支后连续T梁桥;极限承载力;有限元;全过程受力

Study on full loading process performance of simplysupported continuous T-beam bridge
ZHU Xiaoqing, CHEN Daiha, CHEN Huai

School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China

Abstract:The paper studied the stress performance of simply supported continuous T-beam bridge from construction stage to the ultimate failure. By considering the material and geometric nonlinear conditions, the finite element software Midas/FEA was used to simulate the three-dimensional solid model of a full-bridge under the six kinds of conditions in the engineering background of Xizhangcun Bridge in Henan Province Highway S318. The results showed that: The live load factor in unbalance loading working condition was less than that of balanced when the bridge reach the ultimate bearing capacity; The concrete in the bottom of support cross-section of the spandrel beam was crushed firstly in unbalance loading working condition; In the condition of balance loading working the concrete in the top of the key sections of girder at the load position was crushed firstly; The concrete at the top of the girder precast reached the critical stress earlier than in the wet-joint and their force were asynchronous.

 

Key words: simply supported continuous T-beam bridge; ultimate bearing capacity; finite element; full loading process

ISSN 1672-7029
CN 43-1423/U

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