Study On Buckling Of Web With Circle Openings In I-Shaped Beam

There are strict requirements of Modern architecture of interior clearance height, equipment of the pipeline usually needs to pass through from the beams.Therefore,the creation of a certain size holes in the vicinity of the beam web beam-column joints,it met the function of housing and improved the seismic performance multi-tall steel frame structure joint.In the field of steel structure,joist has been widely used because it producte convenience and force reasonable. Scholars study for the overall stability of the web openings beam relatively mature,but research the local stability of the open web joist is less.This paper studies uniformly distributed load and partial loads of beam which research elastic buckling of web with circle openings.The research of elastic buckling of web with circle openings in I-Shaped Beam under uniform loads.Firstly,discussing unidirectional under pressure of rectangular plate and with circle openings rectangular plate which research elastic buckling. Then analyzed under uniform loads rectangular plate and with circle openings rectangular plate bucking behavior.Finally analyzed under uniform loads beams which of web with circle openings.According to the calculation results can be obtained.①At the same binding effect on the I-beam flanges, buckling coefficient of web with circle openings in I-Shaped Beam with increasing aspect ratio decreases.②When L/h is greater than one,buckling coefficient with increase of the opening ratio;when L/h is equal to one,it with increase of the opening ratio,then a slight increasing trend.Study on partial loads with circle openings in I-Shaped Beam elastic buckling. Consider three variable parameters affect buckling,such as loading width codfficient cc=0.0-0.5,the opening rate d/h=0.1-0.8,the board aspect L/h=1.0-2.0,then the discuss buckling performance of rectangdular plate or rectangular plate with opening which of the two boundary conditions is simply supported and clamped.Further analysis partial load with circle openings in I-Shaped Beam which is under the same binding effect on joist flanges of the case elastic buckling. According to the calculation results can be obtained. ①Under partial load the rectangular plate with circle openings buckling coefficient increases with aspect ratio gradually decreases opening rate increases, gradually increases load width increases. ②Under partial loads the web with circle openings in I-Shaped Beam of buckling coefficient with increasing aspect ratio decreases,with load factor cc increases gradually increases.This changes coincide with open rectangular plate. ③At the same of aspect ratio and the opening rate, Under partial loads the web with circle openings in I-Shaped Beam of buckling coefficient greater than simply supported rectangular plate and less than clamped rectangular plate which has circle openings.This is consistent with the specification theory which joist flanges constraint on the web.