宽箱梁桥剪力滞效应的实用计算

发布时间：2018-03-01 22:13

本文关键词： 宽箱梁桥剪力滞效应比拟杆法能量变分法实用计算函数拟合　出处：《华南理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着经济建设的发展，我国交通流量的不断增加，公路桥梁的宽度也不断增加，，从而使箱梁截面的形式从单箱单室截面向单箱多室截面发展，即宽箱梁愈来愈多的在桥梁建设中涌现。目前对单箱单室截面的剪力滞效应研究比较多，但对宽箱梁桥剪力滞问题的研究比较少。而我国现行的规范缺乏如何具体确定宽箱梁桥的剪力滞效应，因此有必要对宽箱梁剪力滞进行研究。本文系统介绍了目前剪力滞效应的发展现状和研究理论，然后根据目前的研究现状提出本文的研究内容和方向。用比拟杆法对单箱四室箱梁剪力滞效应进行分析，求得在集中和均布荷载作用下简支、悬臂梁的剪力滞系数计算公式。推导了基于能量变分法的单箱四室剪力滞效应的微分方程，根据常见的边界条件和典型结构形式对能量变分法进行求解。结合工程算例，利用有限元软件ANSYS和MIDAS计算结果对比拟杆法和能量变分法进行复核，经过比较论证了本文所推导公式的正确性。介绍了宽箱梁桥剪力滞效应的四种实用计算方法及其局限性，然后根据宽箱梁桥剪力滞效应的规律和能量变分法公式推导，提出相应的拟合函数并用已计算出的数据用Origin进行拟合，得到了简支宽箱梁桥在集中、均布荷载作用下悬臂板、翼板的实用计算公式。本文首次结合Origin软件和概率的方法拟合出剪力滞的实用计算公式，为桥梁工程设计人员提供了关于宽箱梁桥剪力滞计算的参考。
[Abstract]:With the development of economic construction, the traffic flow and the width of highway bridge are increasing, which makes the cross section of box girder develop from single box section to single box section to single box section. That is, more and more wide box girders are emerging in bridge construction. At present, there are many researches on shear lag effect of single box and single chamber section. However, there are few researches on the shear lag of wide box girder bridge. However, the current code of our country lacks of how to determine the shear lag effect of wide box girder bridge, so it is necessary to study the shear lag of wide box girder bridge. This paper systematically introduces the development and research theory of shear lag effect, and then puts forward the research content and direction of this paper according to the present research situation. The shear lag effect of single box four-compartment box girder is analyzed by analogy bar method. The formulas for calculating the shear lag coefficients of simply supported cantilever beams under concentrated and uniform loads are obtained. The differential equation of shear lag effect in a single box with four chambers based on the energy variational method is derived. The energy variational method is solved according to the common boundary conditions and typical structural forms. Combining with an engineering example, the analogy rod method and the energy variational method are checked by the finite element software ANSYS and MIDAS. Four practical calculation methods and their limitations of shear lag effect of wide box girder bridge are introduced, and then the formula of shear lag effect of wide box girder bridge is deduced according to the law of shear lag effect of wide box girder bridge and the formula of energy variation method. The corresponding fitting function is put forward and the calculated data is fitted with Origin. The cantilever plate of the simply supported wide box girder bridge under concentrated and uniform load is obtained. In this paper, the practical calculation formula of shear lag is first fitted with Origin software and probability method, which provides a reference for bridge designers to calculate shear lag of wide box girder bridge.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U448.213

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