Failure Criterion Of Steel Frame Based On Strain Energy Density And Its Application In Damping Structure

In view of the current situation that the steel frame structure system in the field of structural seismic analysis is short of a rational failure criterion related problem,this paper analyzes the whole process behavior of the H steel structure and steel frame structure under static and dynamic load based on the parameter of the sum of structural exponential strain energy density ESED.The purpose of this study is to summarize and propose a set of failure criteria for the steel frame structure from the angle of energy and have a certain theoretical basis,and extend it to the BRB damping structure to verify the applicability of the criterion.First,the concept of thin-walled structure and thin film stress stiffening is introduced,and in this paper the change of energy composition in a structure when a large number of units accumulated a lot of strain energy is analyzed.The strain energy changes of steel members and steel frame structures before and after structural failure are analyzed and compared from the theoretical level.Secondly,this study takes the single degree of freedom mass system as an example,and the variation of strain energy of structural element with the external load is explored.It is proved that the element strain energy can be used to judge the failure parameters of the structure.At the same time,the strain energy of the structural element is studied by the analytical solution and the numerical solution.The accuracy of the theoretical basis is further verified.By combining the description of the concept of the stress state of different structures,the sum of structural exponential strain energy density ESED are introduced and the failure criterion of the steel structure system is summed up in combination with the numerical simulation results,and the eigenvalue points of the above failure criteria are selected in a certain range.The reasonableness is discussed.Then,this study takes H steel element,component,simple frame and complex frame as an example.The changes of the structural responses of various structures under static or full load domain dynamic time history analysis are extracted and analyzed,and the energy parameters and displacement of the structural index stress density and value are compared.The reference value of the parameter dis(the maximum node displacement of the structure)to the characterization of the overall working behavior of the structure shows that the structural exponential strain energy density and the value of the structure have obvious advantages over the maximum structural node displacement.Furthermore,the application range of failure criterion of steel structure based on the sum of structural exponential strain energy density ESED is discussed,and the relationship between the exponential strain energy density and the value of the structure and the peak acceleration of the earthquake is discussed.The performance of the ESED-A curve for the whole and local performance of different structures is also discussed.The related research of the problem will provide some reference.Finally,the steel frame failure criterion based on the sum of structural exponential strain energy density ESED is introduced into the damping steel frame with additional BRB,and its applicability is verified.At the same time,the pure frame and BRB damping frame are compared from the angle of failure load,and the changes of the structural failure load before and after the BRB arrangement are discussed.It is found that the reasonable arrangement of BRB can effectively improve the failure load of the structure.