大跨径变截面单箱三室波纹钢腹板组合连续箱梁桥剪力滞效应研究

发布时间：2018-06-30 01:43

本文选题：桥梁工程 + 波纹钢腹板组合截面　；参考：《长安大学》2014年硕士论文

【摘要】：21世纪以来，随着我国组合梁桥的迅速发展，波纹钢腹板组合箱梁桥的应用越来越广泛。本文在总结前人研究成果基础上，，通过理论推导和有限元分析，系统地研究了大跨径变截面单箱三室波纹钢腹板组合连续箱梁桥剪力滞后效应，本文主要完成的工作：首先介绍了波纹钢腹板组合梁桥在桥梁工程结构中的发展历史和应用现状；然后基于剪切变形规律确定各箱室翼缘板剪力流的比值，定义了单箱三室波纹钢腹板组合截面上、下翼缘板的剪力滞翘曲位移函数，应用能量变分法的最小势能原理分别推导了在集中荷载和均布荷载作用下单箱三室波纹钢腹板组合连续梁桥上、下翼缘板的纵向正应力及其剪力滞系数的计算公式。针对大跨径变截面波纹钢腹板组合连续箱梁桥奉化江大桥，采用有限元方法研究了在集中荷载、均布荷载、实桥工况（体外预应力荷载、自重+体外预应力荷载、移动荷载）作用下全桥关键截面（即中跨跨中、中跨l/4、中支座、边跨l/4及边跨跨中位置）上、下翼缘板的纵向正应力及其剪力滞系数的分布；并针对剪力滞后效应较为严重的中跨跨中位置上、下翼缘板的关键计算点，采用第二章推导的纵向正应力的理论计算公式进行了复核；对全桥梁段截面在集中荷载和均布荷载作用下上、下翼缘板的最大剪力滞系数沿主梁纵向位置的分布规律进行了分析。采用有限元方法对影响单箱三室波纹钢腹板组合箱梁桥关键截面的上、下翼缘板剪力滞后效应的结构构造参数如宽跨比、宽高比、悬翼比（内室悬翼比及外室悬翼比进行了参数分析，并提出了以敏感参数为变量的剪力滞系数的经验公式。本文最后依据翼缘板的有效分布宽度比与最大剪力滞系数的倒数关系，提出了适用于单箱三室波纹钢腹板组合箱梁桥上、下翼缘板计算有效分布宽度的经验公式，并与同跨等荷载等截面混凝土腹板连续梁桥翼缘板的有效分布宽度进行了对比分析。
[Abstract]:Since the 21st century, with the rapid development of composite girder bridges in China, corrugated steel webs composite box girder bridges are more and more widely used. Based on the previous research results, the shear lag effect of long span variable cross section single box, three compartment corrugated steel web composite continuous box girder bridge is systematically studied by theoretical derivation and finite element analysis in this paper. The main work of this paper is as follows: firstly, the development history and application status of corrugated steel web composite beam bridge in bridge structure are introduced, and then the shear flow ratio of flange plate in each box is determined based on shear deformation law. The shear lag warpage displacement function of the lower flange plate on the combined section of three compartments corrugated steel web in a single box is defined. By using the principle of minimum potential energy of the energy variational method, the formulas for calculating the longitudinal normal stress and shear lag coefficient of the lower flange plate on the three-compartment corrugated steel web composite continuous beam bridge with order box issued by concentrated load and uniform load are derived, respectively. In view of Fenghua River Bridge with corrugated steel webs combined with long span variable cross section, the finite element method is used to study the concentrated load, uniform load, real bridge condition (external prestressing load, self-weight external prestress load). The distribution of longitudinal normal stress and shear lag coefficient of the bottom flange plate on the key section of the whole bridge under the action of moving load (that is, the middle span, the middle span l / 4, the middle support, the side span l / 4 and the side span middle position); According to the key calculation point of the lower flange plate where the shear lag effect is more serious in the middle span and the middle span, the theoretical formula of the longitudinal normal stress derived in the second chapter is used to recheck. The distribution of the maximum shear lag coefficient of the lower flange plate along the longitudinal position of the main beam is analyzed under the action of concentrated load and uniform load on the section of the whole bridge section. The structural parameters, such as width to span ratio and width to height ratio, which influence the shear lag effect of flange plate on the key sections of a single box, three compartment corrugated steel web girder bridge, are studied by finite element method. The parameter analysis of the hanging wing ratio (the ratio of the inner wing and the outer wing) is carried out, and the empirical formula of the shear lag coefficient with the sensitive parameter as the variable is proposed. Finally, according to the reciprocal relation between the effective distribution width ratio of flange plate and the maximum shear lag coefficient, an empirical formula for calculating the effective distribution width of the lower flange plate on a single box and three compartment corrugated steel web composite box girder bridge is presented. And the effective distribution width of the flange plate of the concrete web continuous beam bridge with the same span and equal load is compared and analyzed.
【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】：U441;U448.213

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