Research Of Box Beam Shear Lag Effects Under Different Lateral Loading Position Though Model Test Studies And Finite Element Analysis

Professor Wu Yaping study on the effect of the lateral loading position in the structural to the mechanical properties of the box beam.His Student, Yang Mei had deduced the analytic theory of solutions about the shear lag of Crest plank and Scale board.This thesis study the issue further from doing lots of experiments.This thesis establish the trial models using the organic glass plate and Give imitate analysis to the real box beam.This thesis also analyses the theories though building up the finite element model using ANSYS software.Main research shear lag effect and the curve line type under the length ways contingency horizontal distribute(length ways contingency function ).This article is divided into 6 chapters. Chapter 1 of the study of thin-walled box girder and the shear lag effect of the existing theories and methods are overview. Chapter 2 makes the preparatory work before the trial and makes the simply supported box girder of the organic glass plate.Tested the elastic Flexible mold quantity, Poisson's ratio, Strength of materials and bonding materials, as well as time to load deformation effects.Chapter 3 explains the Experiment, analyse and research the test result.The chapter is concerning on the box loading process, methods, test results analysis and synthesis of a separate comparative analysis about the four different forms structure.Chapter 4 based on the experiment model and the characteristics of finite element model using ANSYS software to build the finite element model according to experiment model,so the test results are provided a reliable basis.Chapter 5 is based on the comparison to the test model results and the results of ANSYS analysis.To verify the comparability between the test results and the ANSYS results and the accuracy of the test results and the ANSYS results. Chapter 6 gives the conclusions of this paper and prospects.In this thesis, complete the following tasks:(1) Creating a reasonable Box beam model with Organic glass template.The model including: Having wing edge plank and only a side plate flange box beam model, Not having wing edge plank and only a side plate flange box beam model, Having wing edge plank and have five flange plate box beam mode,Not having wing edge plank and have five flange plate box beam mode,Exert the load in the cross-beam and inter-quartile position respectively to the four box models, and the lateral loading changed position should be considered. Research:the vertical strain distribution curves and the shear lag effect of the roof cross, cross in the floor, roof and a quarter of a quarter of an inter-cross-floor considering the lateral loading changed position in exerting noodles;compared the relationship between shear lag effect.(2) Building up finite models using SHELL63 finite element,Research:the different shear lag effect caused by the different bound location of simply supported box beam;The difference between the shear lag effect increase and not the middle of the diaphragm in the same load difference;Analyse lag effect and vertical distribution of horizontal strain curve, Analyse shear deformation of the cross-box in the roof support, cross-in floor, roof cross-quarter, a quarter of an inter-plate shear when load in across; Analyse shear lag effect of horizontal and vertical distribution of strain,cross-horizontal shear deformation of the cross-box in the roof support, cross-in floor, roof cross-quarter, a quarter of cross-bottom when lateral changing load in a quarter.(3) Giving comparisons between test results and finite element results to verify and contrast accuracy of two kinds of result. Combination of shear lag effect of past research results, given the results of this study reliable.