Analysis Of Bearing Behavior For Steel Beams And Composite Beams With Web Opening

If web openings with H- steel beams and composite beams, its mechanical properties changed, the current domestic literatures most focused on research of designings strength performance, but its deformation performance rarely attracted people's attention. Theory and experiment show that the steel beams H-beam assembling and open hole, can cause the hole place after top and bottom t-shaped section produce local bending moment (also called secondary moment), under load outside the area nearby, the hole has obviously shearing deformation, flat section, although the hole was assumption that no longer each section of the above and below the flat still, but the two local section of the normal sections have mutual dislocation and not in total cross-section formed within a flat section, which makes the hole area within a period of length and the theory of traditional beam cannot use the way to calculate deflection, our country "steel structure design rules" (GB50017-2003) also gives no h-beam assembling steel beams after open hole with torsion deformation calculation method.In this paper, the deformation of the rigid arm holes based on this model, the concentric open hole perforation H-beam simply-supported steel beam concentrated force in cross elastic buckling load deformation problems were analyzed and investigated, puts forward a simple and reasonable calculating method. And with hole hole of wide variety with high beam position and change and not take holes beam in the same loads deflection curves were compared. And this paper by using finite element software to open various shapes the mouth of the cave perforation of elastic composite steel and buckling analysis and calculation of the ultimate bearing capacity, and gives the opening every hole perforation after the steel beams and torsion deformation graphics and stress strain graphics, will force transmission model introduced to the truss girder beams of webs, and round, square and steel beams of diamond hole with different effects of the deformation and stress made reasonable analysis and explanation.