简支箱梁剪力滞效应变化规律的研究

发布时间：2018-10-09 18:09

【摘要】：箱梁与其他桥型相比较,因其良好的抗扭性能等优点,使得其在桥梁建设中使用最为广泛。但在同等情况下对比其他桥型,箱梁受剪力滞效应的破坏程度最为显著,而且这是工程界一直都未解决的难题。随着社会交通的快速发展,受使用功能、环境、造价等因素的影响,箱梁截面的设计需要不断地完善优化,而截面的优化设计可以减轻剪力滞效应的影响。基于此,本文依托于河北省研究生创新基金项目“钢筋混凝土剪力滞效应的研究”(项目编号:213),以简支箱梁为研究对象,探讨了其几何截面积不变,截面特性对跨中截面剪力滞效应的影响。本课题的研究完成了以下工作:1,本文进行了有机玻璃模型试验研究,对简支箱梁受跨中集中荷载时,其跨中截面剪力滞系数受截面几何特性影响的变化规律,进行了深入的探讨和研究。2,对32米简支箱梁在《高速铁路设计规范TB 10621-2014》中的“ZK标准活载”工况进行了计算,对其跨中截面剪力滞系数、翼板与腹板的纵向剪切应力的变化规律进行了详细的分析。3,对简支箱梁在移动荷载下,其跨中截面剪力滞系数、挠度和截面正应力的变化规律进行了研究。4,本文对简支箱梁在地震作用下,其跨中截面剪力滞系数、挠度和截面正应力的变化规律进行了研究。5,对简支箱梁受跨中集中荷载时,能量变分法计算剪力滞系数的公式进行了优化分析,并给出最优计算方法。通过本课题的研究,为后人提供了一种研究思路:由于实际情况需要对简支箱梁截面进行优化设计时,如何更好地减小剪力滞效应造成的影响,但又要兼顾桥梁的其他力学行为,从而优化箱梁的截面设计,对于我国桥梁设计与建设具有重要意义。
[Abstract]:Compared with other bridge types, box girder is widely used in bridge construction because of its good torsion resistance and other advantages. But under the same condition, the damage degree of box girder subjected to shear lag effect is the most significant, and this is a difficult problem which has not been solved by the engineering field. With the rapid development of social transportation, the design of box girder section needs to be improved and optimized, and the optimum design of the section can reduce the influence of shear lag effect due to the influence of the function of use, the environment, the cost of the box girder and so on. Based on this, this paper is based on the research of reinforced concrete shear lag effect (Project No.: 213), which is a project of Hebei Provincial Graduate Innovation Foundation, and takes simply supported box girder as the research object, and discusses its geometric cross-sectional area invariance. The effect of cross section characteristics on shear lag effect of cross section. The research of this subject has completed the following work: 1. In this paper, the model tests of plexiglass have been carried out. The variation law of shear lag coefficient of simply supported box girder subjected to the concentrated load in the middle of span is influenced by the geometric characteristics of the cross section. In this paper, the "ZK standard live load" working condition of 32-meter simply supported box girder in TB 10621-2014 is calculated, and the shear lag coefficient of the mid-span section of the box girder is calculated. The variation law of longitudinal shear stress of wing plate and web plate is analyzed in detail. The shear lag coefficient of span section of simply supported box girder under moving load is analyzed in detail. The variation law of deflection and normal stress of section is studied in this paper. In this paper, the shear lag coefficient, deflection and normal stress of span section of simply supported box girder under seismic action are studied. 5. When simply supported box girder is subjected to concentrated load in span, the variation law of shear lag coefficient, deflection and normal stress of cross section are studied in this paper. The formula of calculating shear lag coefficient by energy variational method is optimized and the optimal calculation method is given. Through the research of this subject, it provides a research idea for future generations: how to reduce the influence of shear lag effect better when the section of simply supported box girder needs to be optimized for the actual situation. However, it is of great significance for bridge design and construction to optimize the cross-section design of box girder by taking into account other mechanical behaviors of bridges.
【学位授予单位】：河北建筑工程学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U441

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