Out-of-plan Behavior Research of Prefabricated Light Steel Frame Composite Floor
A new type of prefabricated light steel frame composite floor was proposed,In order to investigate its out-of-plan force performance,a full-scale prefabricated light steel frame composite floor specimen was fabricated.Out-of-plan loading tests were conducted on the full-scale specimen to investigate the failure characteristics of the light steel frame composite floor.The bearing capacity,stiffness,deformation capacity,and strain of the specimen were analyzed.A refined finite element model of the prefabricated light steel frame composite floor was established,and out-of-plan performance numerical simulation and parameter analysis were carried out.The results show that when the composite floor reached the ultimate state of bearing capacity,the tensile cracks at the bottom of the slab were fully developed,the steel beam underwent torsional deformation along the weak axis,and the bottom reinforcement fractured.The load-carrying capacity of the composite floor increased by 37.3％,65.2％when the reinforcement ratio of the prefabricated floor slab increased from 0.16％to 0.42％,0.65％,respectively.When the spacing of the shear studs increased from 200mm to 400,600mm,the load-carrying capacity of the floor decreased by 8.2％,19.0％,respectively.After removing the shear studs between the floor and the H-shaped steel beam,the bearing capacity and stiffness of the floor decreased by 26.4％,46.0％,respectively.The numerical simulation results agreed well with the experimental results,and the structural design of the floor was optimized through parameter analysis,providing references for engineering design.
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