C匝道简支钢箱梁桥的力学性能分析

发布时间：2018-01-10 03:12

本文关键词：C匝道简支钢箱梁桥的力学性能分析　出处：《燕山大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着公路交通运输的迅速发展,曲线钢箱梁桥在现代交通中应用越来越广泛。因为匝道上布置桥梁墩位时要充分考虑到所跨越的桥梁和地面道路系统,并留出现有和规划的公共设施位置,所以通常选择曲线钢箱梁桥。钢箱梁是典型的空间薄壁结构,弯扭耦合作用使得其即使在恒载作用下的应力分布也比较复杂,因此必须按照设计规范对其力学性能进行仿真分析。首先本论文采用有限元软件ANSYS Workbench和ANSYS/LS-DYNA,对昆明南连线高速公路40米C匝道钢箱梁桥进行了数值仿真。根据设计图纸建立了整桥的有限元模型,按照公路桥涵设计通用规范,确定了荷载。通过静力分析得到了整桥应力分布及不同工况下的最不利位置。其次通过自振特性分析得到了该桥的固有频率和振型,验证其是否满足规范,为其动力学分析和克服共振和有害振动提供了基础。最后是用ANSYS有限元软件采用板壳单元建模,利用非线性有限元软件ANSYS/LS-DYNA采用ALE多物质流固耦合算法对该桥做爆炸模拟,得出不同量的炸药对该桥的同一位置和同种爆炸量在不同高度响应,本文进行了对比分析,研究其对钢箱梁桥破坏程度的影响和破坏机理。本文对C匝道简支钢箱梁桥的分析计算获得的结论将对于同类型桥梁设计具有一定的理论意义和工程实际应用价值。
[Abstract]:With the rapid development of highway transportation, curved steel box girder bridges are more and more widely used in modern traffic. Because of the location of public facilities, curved steel box girder bridge is usually chosen. The steel box girder is a typical thin-walled space structure. The coupling of bending and torsion makes the stress distribution more complicated even under dead load. Therefore, the mechanical properties must be simulated and analyzed according to the design specification. Firstly, the finite element software ANSYS Workbench and ANSYS/LS-DYNA are used in this paper. The numerical simulation of 40m C ramp steel box girder bridge of Kunming South Link Expressway is carried out. According to the design drawings, the finite element model of the whole bridge is established, and the general specification for the design of highway bridge and culvert is established. Through static analysis, the stress distribution of the whole bridge and the most unfavorable position under different working conditions are obtained. Secondly, the natural frequency and vibration mode of the bridge are obtained by the analysis of the natural vibration characteristics to verify whether the bridge meets the specifications. It provides a foundation for dynamic analysis and overcoming resonance and harmful vibration. Finally, the finite element model of plate and shell is used in ANSYS software. The nonlinear finite element software ANSYS/LS-DYNA is used to simulate the explosion of the bridge using ALE multi-material fluid-solid coupling algorithm. It is concluded that the same position of the bridge and the same amount of explosive at different heights are responding to different quantities of explosives, and the comparison and analysis are carried out in this paper. The analysis and calculation of C ramp simply supported steel box girder bridge will have certain theoretical significance and practical application value for the design of the same type of bridge. Value.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.213

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