Seismic Behavior Analysis Of K-type Eccentrically Braced Composite High Strength Steel Frame

With the development of social economy and the continuous innovation of scientific research work,the steel structure has the characteristics of high strength,light weight,good plasticity,convenient demolition and high industrialization,etc.,and has been widely used in various fields of national economy.Commonly used in the form of steel structure for the central support and pure framework.Eccentric support structure of the introduction of the two will play to the extreme strengths.Under the action of earthquake,most of the components are in the phase of linear stress,and the performance indexes meet the requirements of specifications.Under the action of rare earthquakes,the eccentric system exerts good energy-dissipation performance,so the structure does not collapse.The current steel structure design and construction generally use ordinary strength steel,the actual project is almost no eccentric support high-strength steel frame,whether the new seismic structure system applied to the actual,but also the vast number of researchers continue to improve and perfect its seismic performance Research methods,give a reliable and comprehensive design calculation methods and research theory,and strive to promote this eccentric high-strength steel frame in the production and living applications.In this paper,K-type eccentrically braced composite high-strength steel frame structure is adopted,and the cross-section design is carried out by using SAP2000 finite element analysis software.The energy dissipation beam section of steel frame adopts shear type and bending type respectively.Pushover and dynamic time history analysis of three-,The seismic behavior of the structure and the distribution of the plastic hinge are studied.The results show that the double lateral resistance system constructed by the high energy steel beam can be used as the first "fuse" to enter the plastic,And the other members are basically in elastic state.Because the yield strength ratio and elongation of high strength steel do not meet the requirements of specifications,eccentric bracing and energy dissipation beam are introduced to provide the possibility for engineering application.As the participants of the project,monotonic loading and cyclic loading of the single-span and single-span specimens in the eccentrically braced high-strength steel frame of K-type are carried out in the experimental part of the experiment.The length of the beam can be regarded as a single variable,the failure mode of the specimen and the main seismic performance index are studied and analyzed.