混凝土箱梁和T梁交接处剪应力传递与应力分布

项目名称： 混凝土箱梁和T梁交接处剪应力传递与应力分布

项目编号： No.51278207

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 建筑科学

项目作者： 董毓利

作者单位： 华侨大学

项目金额： 80万元

中文摘要： 本项目主要研究混凝土箱梁、T梁腹板-翼板交接处剪应力传递及对翼板中正应力分布的影响。通过对混凝土简支箱梁、连续箱梁、不同厚度和不同宽度简支T梁进行试验，考察梁在纯弯曲段、反弯点和支座处梁截面的变形特征和整个梁的受力力学性能；在翼板上、下对称布置应变片同时，利用特制装置对混凝土内部的应变也进行测定；根据测定的混凝土箱梁和T梁截面应变，利用混凝土应力－应变关系计算截面的应力，比照Bernoulli-Euler梁理论，确定箱梁、T梁交接处腹板剪应力在翼板中沿宽度方向和厚度方向的传递规律，考察它们对受拉和受压弯曲应力的影响；利用Timoshenko梁单元考虑腹板的剪切变形，根据测定的截面变形修正箱梁、T梁翼板的位移形函数，建立合理的有限元分析方法，并对重要参数进行分析；综合试验和有限元分析结果，提出便于工程应用的箱梁、T梁截面应力计算公式。

中文关键词： 剪力滞效应；混凝土；T梁；箱梁；应力分布

英文摘要： The transfer of shear stresses from web-flange junction to flange and the distribution of normal stresses in box beams and T beams on concrete will be investigated. The typical sectional characteristics at which without shear forces or bending moments and the mechanical properties of box beams and T beams will be studied during the beam tests. The beam tests consists of one two-span continuous box beam, one simply supported box beam, six T beams with different web widths and six T beams with different flange heights. At every section, the strain gauges are attached on the top and bottom surfaces of the flanges and special gauges are embedded in the flanges as well. Based on concrete stress-strain relationship, the stresses at the section may be calculated. As per the Bernoulli-Euler theory, the transfer of shear stresses from junction to flange can be determined, and the influence of which on the bending stresses in tensile and compression will be studied meanwhile. Using the Timoshenko theory to consider the shear deformation of the web, a modified finite element method with an additive displacement shape function for flange will be proposed, and some important parameters will be studied as well. A formula to calculate the stresses in box beams and T beams of concrete will be given, which is based on the experi

英文关键词： Shear lag effect；concrete；T beams；Box beams；stress distribution