大跨径波纹钢腹板组合梁桥挠度分析

发布时间：2018-05-25 07:03

本文选题：波纹钢腹板 + 组合箱梁　；参考：《长安大学》2014年硕士论文

【摘要】：波纹钢腹板组合箱梁是一种新的结构形式,能够有效的实现主梁的轻型化,进而减轻下部结构的工程量,同时解决了混凝土腹板出现斜裂缝的问题。多数的连续梁桥在运营过程中都出现挠度过大的问题，严重影响了桥梁线型的平顺、行车的舒适性，因此对波纹刚腹板组合梁桥的挠度研究有重要意义。论文阐述了大跨组合连续箱梁桥设计、施工的发展和研究现状；介绍了考虑剪切变形挠度的计算理论、混凝土的收缩、徐变以及预应力的损失的机理以及其对大跨波纹钢腹板挠度产生的影响；运用Midas civil/FEA建立有限元模型，并将civil/FEA计算结果进行对比，验证计算的准确性；建立了简支梁模型，分析了不同的波纹钢腹板几何参数对组合箱梁挠度的影响。以邢台某大桥为工程背景，，研究了考虑剪切变形、混凝土的收缩徐变、预应力损失及温度、刚度损失及车辆荷载对桥梁挠度的影响。通过分析得出了各因素引起挠度变化的规律。最后，从设计、施工方面给出了一些控制措施，为组合箱梁桥的长期效应计算、观测等提供有用的参考。
[Abstract]:Corrugated steel web composite box girder is a new structural form, which can effectively realize the lightening of the main girder, and then reduce the amount of construction of the substructure, at the same time, solve the problem of inclined cracks in concrete web. Most continuous beam bridges have the problem of excessive deflection in operation, which seriously affects the smoothness of bridge alignment and driving comfort, so it is of great significance to study the deflection of corrugated rigid web composite girder bridge. This paper expounds the development and research status of the design and construction of long-span composite continuous box girder bridge, and introduces the calculation theory of considering shear deformation deflection, the shrinkage of concrete, The mechanism of creep and the loss of prestress and its influence on the deflection of long-span corrugated steel webs are analyzed. The finite element model is established by using Midas civil/FEA, and the results of civil/FEA calculation are compared to verify the accuracy of the calculation, and the simply supported beam model is established. The effect of different geometric parameters of corrugated steel web on deflection of composite box girder is analyzed. Taking a bridge in Xingtai as an engineering background, the effects of shear deformation, shrinkage and creep of concrete, loss of prestress and temperature, stiffness loss and vehicle load on the deflection of the bridge are studied. Through analysis, the law of deflection change caused by various factors is obtained. Finally, some control measures are given from the aspects of design and construction, which provide useful reference for the long-term effect calculation and observation of composite box girder bridges.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.213

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