Study On Seismic Behavior Of Cellular Beam Steel Frame Considering The Effect Of Floor

At present,the theoretical research and experimental analysis of the seismic performance of the cellular beam steel frame structure are relatively few.And the experimental research is limited to pure steel structure pseudo static test research,it cannot fully reflect the whole process of structure under the action of earthquake stress.The research did not consider the combination of the floor effect on seismic performance of structures.And in the actual cellular beam steel frame structure,due to the existence of concrete slabs,it increases the cross section stiffness and bearing capacity,it will have great influence on the overall seismic performance of steel frame structure.Because of the existence of the holes,the cellular beam web is weakened by the existence of holes,forming weak section.By properly selecting the opening ratio of the honeycomb and the distance between the first hole and the column edge,the plastic hinge can be moved from the cylinder to the first hole at the time of the earthquake,and it can effectively alleviate the stress concentration at the joint of beam column joints,and reduce the possibility of brittle failure at the joints.In this paper,based on the existing test of honeycomb composite beam-column joints,taking the research method of combining theoretical analysis and numerical simulation,the seismic performance of the frame structure of the cellular beam steel frame with the floor is analyzed,the cellular beam is a regular hexagon..A finite element model of the honeycomb cellular beam column joints is established,and compared with the experimental results,the rationality of parameters setting in the model is verified,it laid a foundation for the analysis of seismic performance of cellular beam steel frame.The finite element model of the cellular beam steel frame with the floor of the frame is established,the pass is regular hexagon.A static loading analysis of a cellular beam steel frame is carried out,the influence of the opening ratio,the distance between the first hole and the column edge on the yield load and the yield displacement of the structure are studied;A study on the low cycle reciprocating load of the cellular beam steel frame is carried out,the influence of the opening ratio,the distance between the first hole and the column edge on the hysteretic curve,skeleton curve,ductility and energy dissipation capacity of the structure are analyzed.The formation mechanism of plastic hinge and the final failure mode were investigated.Modal analysis of the cellular beam steel frame is carried out,the influence of the opening rate and the distance between the first hole and the column edge on the natural vibration characteristics of the cellular beam steel frame structure is analyzed;The elastic plastic dynamic time history analysis of the cellular beam steel frame structure is carried out,the dynamic response of the structure under different ground motions is studied,the influence of opening ratio and the distance between the first hole and the column edge on the dynamic characteristics of the frame structure of the steel frame beam is analyzed.The influence of the opening rate and the distance between the first hole and the column edge on the plastic hinge of the structure and the stress distribution of the cross section are investigated.A comparative analysis of the dynamic performance of the steel frame structure without floor slab is carried out.The effect of floor slab combined effect on the dynamic response of the beam steel frame structures under different ground motions is studied.After entering into the plastic stage,the effect of the composite effect on the stress distribution of the beam in the vicinity of the nodes is analyzed.The effect of floor slab composite effect on the plastic hinge formation of the beam is revealed.