Study On Pored Position For The Elastic-plastic Buckling Of Web In ?-steel Beam

Modern architecture structure layers often require interweaving equipment layer,besides,the line pipes and conduits shall be laid from the beams to meet the demand of the architecture for the building ceiling height.So we need to take the open pore design for ?-section steel beams.Open pore design will also trigger the beam stability problem,and the research of integrity of the beam center hole in ?-section steel beams from traditional scholars is almost saturated,but the study of open pore design in other places is an void.The research contents of this paper is derived from the tutor's research topic as well as the local buckling on the web of ?-section steel beams of the certain Bridge beam in hole bridge with no navigable section.Accordingly,the paper had completed the research about the impact of the elastic-plastic buckling performance of the web of ?-section steel beams caused by the open pore position.Specially,it mainly includes the following contents:1.The paper thoroughly described the theory course of elastic buckling from home and abroad as well as the Small Deflection Theory and Large Deflection Theory used for solving the buckling problem,and so on;Furthermore,it stated the appliance of Elastic-plastic Buckling Theory and Ansys in solving the buckling problem;2.In accordance with the case of the Hong Kong,zhuhai and macau bridge and steel structure design code,simplify the entity project,on the basis of the finite element model is set up;With case to prove the feasibility of the elastic-plastic buckling problems to solve by the finite element software;3.To begin with,according to the Small Deflection Theory,the Large Deflection Theory and buckling theory of Ansys eigenvalue,the paper did the research of diverse buckling performances of rectangular plates with four edges under the effect of different open pore positions;Based on this foundation,it took a deeper analysis of different buckling under the action of the uniformly distributed load of the web plates of ?-section steel beams with four edges;At the same time,it introduced the buckling effect coefficient from flange slabs to holed web plate of ?-section steel beams;4.When it comes to the impact of elastic-plastic buckling caused from open pore positions to the web plates of ?-section steel beams under partial load,the analytic method is similar to analyzing it subjected to uniformly distributed load.The only difference is the study increased the concept of partial load width affected coefficient.Based on the above research data,we can ultimately summarize the followingseveral conclusions:(1).The buckling coefficient increases following the increase of the diameter-depth ratio,on the contrast,it decreases while the hole diameter increases.(2).Buckling coefficient increases with the increase of the width of load;(3).Due to the constraint function of flange plate,so the buckling coefficient of open pore ?-section steel beams with flange plate is bigger than the rectangular plates with no flange plate in the same condition.This Illustrated the flange plate build-in effect had a certain influence on buckling coefficient,and this effect increases in pace with the increase of hole diameter.(4).For the choice of opening location,the component is safer when the position of round hole on the neutral axis web than it on the Oblique 45°line.