薄壁变截面混凝土曲线箱梁施工阶段剪力滞效应分析

发布时间：2018-01-23 12:29

  本文关键词： 薄壁变截面宽幅箱梁 剪力滞效应 能量法 Midas Civil/fea　出处：《长沙理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：本文对国内外箱型截面桥梁的剪力滞效应研究的现状以及研究分析的方法做了详尽的综述,并对能量法运用在薄壁宽幅变截面连续梁的剪力滞分析的公式和原来进行了详细的推导,并以此为基础,第一步,通过对薄壁宽幅变截面连续梁的进行理论计算,得出腹板与翼板交接处剪力滞效应参数在纵向上分布规律,第二步,结合实际的桥涵工程即虎门白花山大桥,利用有限元软件对薄壁宽幅箱型梁这种截面形式的主梁上的剪力滞效应进行计算分析和研究,并得出其分布规律,第三步,对比工程实践的数据,对其准确性进行对比分析,其主要工作内容,为如下所示的几个方面：(1)对箱型梁桥的剪力滞效应以及负剪力滞效应的研究背景、研究意义以及国内外相关的研究现状和剪力滞效应的力学特点进行阐述,并列出本文的研究内容和研究目标。(2)详细介绍能量变分法、比拟杆法、有限段法的计算原理。(3)通过基于能量变分法的最小势能原理详细推导了箱型截面的剪力滞效应以及负剪力滞效应的求解公式,并运用此公式对工程实例中出现的变截面曲线薄壁宽幅箱型梁在自重荷载作用下的剪力滞效应参数在腹板与翼板交接处的理论数值,进而拓展对其分布规律进行的分析和阐述,得出在理论范围内剪力滞效应和负剪力滞效应影响最大的截面。(4)通过建立虎门白花山大桥工程实例的Midas Civil杆单元有限元模型,对变截面曲线薄壁宽幅箱型梁在自重荷载作用下的关键施工阶段进行有限元模拟计算和分析,得出了在剪力滞效应影响下纵向应力的分布规律；通过建立Midas Fea实体单元有限元模型,对Midas Civil有限元计算中得出的受剪力滞效应影响最大的截面(控制性截面)进行局部分析,得出在剪力滞效应和负剪力滞效应影响下纵向正应力沿横向分布规律。(5)结合工程实例中的应力监控数据,对选定的关键截面应力应变值进行分析,得出在剪力滞效应影响下,纵向应力沿横向的分布规律并对理论数据和实测数据进行对比分析。
[Abstract]:In this paper, the present situation of research on shear lag effect of box section bridges at home and abroad and the methods of research and analysis are summarized in detail. The formula of shear lag analysis of thin-walled and wide-width continuous beams with variable cross-section and the original formula are derived in detail, and based on this, the first step is to apply the energy method to the analysis of shear lag of continuous beams with variable cross-section of thin-walled and wide-amplitude. Through the theoretical calculation of the thin-walled wide variable cross-section continuous beam, the longitudinal distribution law of shear lag effect parameters at the junction of web and flange is obtained. The second step, combined with the actual bridge and culvert project, is the Humen Baihuashan Bridge. By using finite element software, the shear lag effect on the main girder with thin-walled and wide-width box girder is calculated and analyzed, and the distribution law is obtained. The third step is to compare the engineering data. Its accuracy is compared and analyzed. The main work is the background of the research on the shear lag effect and negative shear lag effect of box girder bridge in the following aspects: 1. The significance of the research and the research status at home and abroad as well as the mechanical characteristics of the shear lag effect are expounded, and the research contents and research objectives of this paper are listed. (2) the energy variation method and the analogy rod method are introduced in detail. Based on the minimum potential energy principle of the energy variational method, the formulas for solving the shear lag effect and the negative shear lag effect of the box section are derived in detail. Using this formula, the theoretical value of shear lag effect parameters of variable section curve thin-walled wide box girder under the action of deadweight load at the junction of web and fender is given by using this formula. And then expand the analysis and elaboration of its distribution law. The section with the greatest influence of shear lag effect and negative shear lag effect within the theoretical range is obtained. The finite element model of Midas Civil bar element is established through the engineering example of Humen Baihuashan Bridge. The finite element simulation and analysis of the key construction stage of variable section curve thin-walled and wide-width box girder under deadweight load are carried out, and the distribution of longitudinal stress under the influence of shear lag effect is obtained. The finite element model of Midas Fea solid element is established. The local analysis of the section (control section), which is most affected by shear lag effect, is carried out in the finite element calculation of Midas Civil. Under the influence of shear lag effect and negative shear lag effect, the longitudinal normal stress distribution along the transverse direction is obtained. (5) combined with the stress monitoring data of engineering examples, the selected stress and strain values of key sections are analyzed. Under the influence of shear lag effect, the distribution of longitudinal stress along the transverse direction is obtained, and the theoretical data and the measured data are compared and analyzed.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445;U448.213
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本文编号：1457537