Experimental And Theoretical Research On Damage Model Of Steel Frame Substructure With Reduced Beam Section

Earthquake damage model is one of the important means to describe the structuredamage degree under earthquake, which is important for quantitative assessment ofthe damage to the structure. In this paper, the calculation method of the cumulativehysteretic energy dissipation capacity involved in the refined Park-Ang two-parameterdamage model which is proposed by the literature [24] were studied in detail. Atpresent, taking into account that the research of the load history to cumulativehysteretic energy dissipation capacity is not perfect, this paper take the Steel Framewith RBS as the research object, combined with the experiment and the finite elementanalysis, calculation method of the interlayer cumulative hysteretic energy dissipationcapacity is proposed and provide reference for improving the use of refined Park-Angdamage model to reasonable assessment of structural damage, this paper completedthe following tasks:Five one-bay, three-story, test specimens on one-third are designed and testedunder four different cyclic loading history. The failure modes, the hysteretic behavior,stiffness degradation, deformation and ductility, and cumulative hysteretic dissipatedenergy capacity of the substructure of Steel Frame with RBS are systematic studied.This paper focused on the influence of loading history on hysteretic dissipated energycapacity of the substructure of Steel Frame with RBS.The five specimens was analyzed by software ABAQUS and the results wascompared with experimental results. This paper focused on the comparative analysisof the hysteresis curve, the horizontal bearing capacity, the lateral stiffness, thecumulative hysteretic energy and the equivalent energy dissipation factor ofsubstructure of Steel Frame with RBS. And the rationality and correctness of finiteelement analysis was further validated.In this paper, combining with experiment results, the computational formula ofcumulative plastic corner of the connection node of Steel Frame with RBS proposedby Lignos is modified, and the computational formula of cumulative plastic rotationlimits considering historical influence is proposed to provide the basis to reasonablydetermine destruction of connections node.Software ABAQUS was used to do the finite element analysis of substructureof Steel Frame with RBS. This paper investigates the influence rule of girder span,steel beam flange thickness ratio, girder web thickness ratio, strength of steel and steel column axial compression ratio to cumulative hysteretic energy and the equivalentenergy dissipation factor of Steel Frame with RBS.Based on the finite element analysis results of substructure of Steel Frame withRBS, considering the impact of girder span, steel beam flange thickness ratio, steelbeam web thickness ratio, the strength of steel and load history, and statisticalregression of computational formula of limit equivalent energy dissipation coefficientand provide reference for improving the use of refined Park-Ang damage model toreasonable assessment of structural damage.