考虑自重扭矩和剪切变形影响的曲线梁桥的受力分析

发布时间：2018-05-08 08:58

本文选题：曲线梁桥 + 自重扭矩　；参考：《长沙理工大学》2015年硕士论文

【摘要】：弯桥在空间上受力复杂,其箱梁结构在受到荷载作用时,将会同时产生弯矩和扭矩,并且之间相互影响,该效应成为弯——扭耦合效应。本文在总结前人研究的基础上,对曲线梁桥自重扭矩对支座脱空的影响以及考虑剪切变形时曲线箱梁的受力计算进行分析研究。本文首先分别对曲线梁桥箱梁截面按整体和沿中轴线分割成内弧部分及外弧部分两种形式时进行自重扭矩的计算,得到弯梁在自重扭矩作用下内、外支座产生的反力,判断支座是否脱空,并且与有限元模型对比得出两种截面形式下计算的最优值。其次,在原有弯梁的计算理论上考虑剪切变形的影响,推导出曲线梁桥在考虑剪切变形时内力和反力的计算公式。最后,通过对一个产生支座脱空的工程实例的成桥荷载试验进行分析,给出若干建议,对现行的设计具有理论指导意义。
[Abstract]:The bending bridge is subjected to complex force in space. When the box girder structure is subjected to the load, the bending moment and torque will be produced simultaneously, and the interaction between the bending and torsional moment will occur. This effect is called the bending-torsional coupling effect. In this paper, based on the previous studies, the influence of deadweight torque on support void of curved girder bridge and the force calculation of curved box girder considering shear deformation are analyzed and studied. In this paper, the dead weight torque of box girder section of curved girder bridge is calculated when the section of box girder is divided into internal arc part and outer arc part according to the whole and along the central axis, and the reaction force generated by the external support of the curved beam under the action of self-weight torque is obtained. To determine whether the support is empty or not, and to compare with the finite element model to obtain the optimum value of the two cross section forms. Secondly, considering the influence of shear deformation on the calculation of the original curved beam, the formulas for calculating the internal force and reaction force of the curved beam bridge considering shear deformation are derived. Finally, through the analysis of the bridge load test of an engineering example that produces the pedestal void, some suggestions are given, which is of theoretical significance to the current design.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.21

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