大跨度混合梁刚构桥整体承载性能试验研究

发布时间：2018-05-29 23:23

本文选题：桥梁工程 + 混合梁　；参考：《北京交通大学》2014年硕士论文

【摘要】：本文以瓯江大桥为工程背景,建立1：16的缩尺模型,通过模型试验对该桥的承载性能进行了研究。试验获取了试验桥梁的变形特性、应力发展规律及裂缝发展规律,并对混合梁刚构桥模型的受力特性、承载能力、破坏形态等进行了深入的研究,最后利用有限元对模型试验的弹性工况进行数值模拟,对比试验结果,得出了如下主要研究结论： (1)1.4倍活载作用下,桥梁关键截面位置的变形和内力均能够恢复到初始加载状态,混合梁整体处于弹性工作状态；桥梁在加载至1.4倍活荷载后,依旧能够继续承载,并维持其弹性工作状态,桥梁拥有相当的安全储备。 (2)弹性工况下,有限元软件Midas和ABAQUS对模型桥、实桥仿真分析结果与试验结果相差不大,说明利用有限元软件进行仿真分析的结果有效可靠。 (3)1倍汽车荷载和1.4倍汽车荷载加载时,有限元仿真分析和试验的主要变形和应变结果皆小于设计计算出的变形和应变,说明按规范设计的桥梁存有相当的安全储备。 (4)破坏工况试验中,约5.85倍的活荷载作用下,结构仍旧处于弹性工作状态；随着荷载的继续增加直至结构达到极限状态,结构共能承载大约12.68倍的汽车活载作用,拥有充分的安全储备。 (5)总结了混合梁刚构桥模型的受力控制截面、变形特性、应力发展规律、裂缝发展及分布规律以及最终的破坏失效形式。
[Abstract]:Taking Oujiang Bridge as the engineering background, the 1:16 scale model is established in this paper, and the bearing capacity of the bridge is studied by model test. The deformation characteristic, stress development law and crack development law of the test bridge are obtained by the test. The stress characteristics, bearing capacity and failure form of the model of the hybrid beam rigid frame bridge are studied deeply. Finally, the numerical simulation of the elastic condition of the model test is carried out by using finite element method, and the main research conclusions are obtained by comparing the test results. Under the action of 1.4 times live load, the deformation and internal force of the key section of the bridge can be restored to the initial loading state, the hybrid beam is in an elastic working state, and the bridge can still carry load after loading to 1.4 times live load. And maintain its flexible working state, the bridge has a considerable safety reserve. 2) under the elastic condition, the simulation results of the real bridge with the finite element software Midas and ABAQUS are not much different from the experimental results, which shows that the simulation analysis by using the finite element software is effective and reliable. The main deformation and strain results of finite element simulation analysis and test are smaller than those of design and calculation, which shows that the bridges designed according to the specifications have a considerable safety reserve. 4) in the failure condition test, the structure is still in elastic working state under the action of about 5.85 times of live load, and with the increase of load until the structure reaches the limit state, the structure can carry about 12.68 times of the live load of the automobile. Have sufficient safety reserves. The stress control section, deformation characteristic, stress development law, crack development and distribution law and ultimate failure mode of hybrid beam rigid frame bridge model are summarized.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U446;U448.23

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