| Cellular beam is an laced beam formed by rolling or welding the web of H steel in a particular line or curve.Cellular beams are widely used in large span steel structures,industrial buildings and multi high-rise steel structures.Because of the increase of Web reaming,the cellular beam not only improves the flexural rigidity and flexural bearing capacity of the prototype steel beam,but also facilitates the crossing of the pipeline and effectively reduces the height of the building.The steel is saved so that the beam has good mechanical properties and deformation characteristics.Cellular composite beam steel frame structure is a frame structure which is formed by connecting steel column and cellular composite beam.The main parts of beam column joints as the structure stress,when the earthquake occurred,the most common failure in steel frame beam to column joints,through reasonable design of hole size and hole position of cellular beams can make the structure of the plastic hinge in the earthquake,so as to avoid the beam column connections in beam to form brittle failure before the occurrence of plastic hinge.In the cellular composite beam structure,the cellular beam and the concrete floor are combined together by the shear connector to resist the external force,and the performance of the two building materials,steel and concrete,can be fully utilized.The study on seismic performance of the cellular composite beam column joints at home and abroad is not deep,study on the seismic behavior of frame beam of steel cellular combination is still in the blank state,China is still not a perfect specification for cellular beam structure,which is not conducive to the use and promotion of cellular structure.In order to further understand the dynamic response and failure mode of cellular composite beam steel frame structures under earthquake action.By means of theoretical analysis and model test,the seismic performance of castellated beam steel frame considering floor effect is studied.In accordance with the current codes,a steel frame structure with a span of two stories with a concrete floor is designed.The test equipment and measurement contents of pseudo dynamic test and pseudo static test are designed.Analysis of floor displacement under earthquake time history curves,time history curves of base shear and base shear top displacement curve,the results show that the layer displacement test model reaction trend curve is basically the same,the layer displacement and the peak position is roughly the same,to increase the seismic peak acceleration and floor quality,obviously increase the structure seismic response,base shear top displacement curve under different conditions of the basic structure as a straight line,is still in elastic state,good seismic performance.The two layer single span steel frame considering honeycomb beam plate concrete of pseudo static test,and on the hysteretic behavior of the analysis,the results show that two frame hysteretic curve is stable,full,better energy capacity,the framework of the upper skeleton curve in peak load,rapid decline the bearing capacity of A frame;strength degradation,stiffness degradation and ductility coefficient obviously than the B framework,the framework of the upper two were above 3.Based on the analysis of the failure process,the failure modes of the frame are studied.The periphery of the orifice before the node yield and the formation of plastic hinge,the plastic hinge position away from the beam column connection,the destruction of the structure showing a typical plastic hinge failure mode,to avoid the brittle failure of beam column joints. |
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