Seismic Performance Analysis Of Weakened Joints With Local Corrugated Webs At The End Of I-beam

How to keep traditional steel frame stable in earthquakes is the direction of research scholar insists on,which reduced beam section connections ofsteel frame is a good way to shift the plastic incursion.The weakened joint of steel beam is a good method to realize plastic hinge transfer,and the weakened joint of beam end mainly includes flange weakened joint and web weakened joint.Both types of joints can make the plastic hinge form in the weakened part and stay away from the beam-column joints.But at the same time,it also reduces the compressive and shear capacity of the beam,reduces its out-of-plane stiffness,and weakens its flexural capacity.Corrugated web steel has good out-of-plane stiffness,buckling resistance and shear buckling strength.In this paper,the weakened beam-end joints with corrugated webs are studied,that is,the corrugated webs are used to replace the plane webs in the local position of the beam-end.Based on the ABAQUS,the essay is about the construction of the AW-RBS node model that corresponding to experimental model and the analytics of earthquake resistance of corrugated reduced beam-column connections of H-beam position.Conducting a detailed comparative study for the experimental results and finite element results on existing joints and evaluating the applicability of finite element software analysis to simulate the local corrugated reduced beam-column connections joint of H-beam local position can provide a reference for the finite element numerical analysis technology of the joints.In this paper,two kinds of joints,TX-RBS and ZX-RBS,were selected,conducting comparative analytics of seismic performance with the joint AW-RBS showed that ZX-RBS joint had the strongest earthquake resistance,while AW-RBS joint had the weakest.Data comparison of the three joints:the initial stiffness of ZX-RBS joint was 2.16%and 4.12%higher than that of TX-RBS and AW-RBS joint.The yield load of ZX-RBS joint was 4.38%higher than that of TX-RBS joint and 5.47%higher than that of AW-RBS joint.The ultimate load of ZX-RBS joint was 5.12%higher than that of TX-RBS node and 6.09%higher than that of AW-RBS joint.The ZX-RBS and TX-RBS joints with good seismic performance were selected for parameter expansion analysis,focusing on the analysis of parameters such as the length of corrugated webs a,the distance from corrugated webs to beam-column joints c,the thickness of webs wt and the height of beam section hw,and establishing 4 corresponding series models.The seismic performance of the joint is evaluated reasonably by comparing six indexes:failure mode,hysteretic curve,skeleton curve,displacement ductility factor,stiffness degradation curve and energy dissipation capacity.Result shows that:(1)ZX-RBS joint:a,c,hw,wt have effects on the seismic performance of ZX-RBS joint,but a,c is less of that while wt,hw is bigger.A,80mm?120mm,can meet the seismic requirement,and with its increase,seismic performance will improve,but not by much.C has little influence on the seismic performance of ZX-RBS joint,and the c is 50mm-150mm,which can meet the seismic requirements.The seismic performance of ZX-RBS joint increases with the increase of c,but the improvement is small.Hw has a great effect on the seismic performance of ZX-RBS joints,with the hw ranging from 250mm to 350mm which can meet the seismic requirements.The seismic performance of ZX-RBS joints increases with the increase of hw,and it is large.Wt has a great influence on the seismic performance of ZX-RBS joint,and the wt is 6mm?10mm,which can meet the seismic requirements.The seismic performance increases with the increase of wt,and the increase is large.(2)as for TX-RBS joint:a,c,hw and wt have an impact on the seismic performance of TX-RBS joint;c has a small impact on the seismic performance of TX-RBS joint;a and wt have a general impact on the seismic performance of TX-RBS joint,while hw has a large impact on the seismic performance of TX-RBS joint.Among them,c has little influence on the seismic performance of the TX-RBS joint.When c is 50mm?150mm,it can meet the seismic requirements.When the c is increased,the seismic performance hardly increases.A has a general effects on the seismic performance of the TX-RBS joint.When a is 80mm?120mm,the seismic performance meets the seismic requirements will decrease with the increase of a.Hw has a great influence on the seismic performance of TX-RBS joint,and the hw is ranging from 250mm to 350mm,which can meet the seismic requirements.With the increase of hW,the seismic performance increases gradually,and the increase rate is large.Wt has a general impact on the seismic performance of the TX-RBS node.Wt is ranging from 6mm to 10mm,which can meet the seismic requirements.The seismic performance increases with the increase of wt,but not by much.