Performance Research Of Two-level Yielding Stainless Steel Coupling Beam

Made up of wall limbs and beams,shear wall is the normal structure.The beam,link the wall limbs to resist capsizing moment,is extremely important component in shear walls,while is a important source of lateral stiffness.Structurally,the beams play a role of fuse in the shear wall structure.When comes the earthquake,the beams crack firstly and form the plastic hinge to dissipate energy while protecting the major structure.Combine the stainless-steel's outstanding performance,with low proportional limit,good ductility and strain hardening capacity,almostly important its design strength is lower than the ordinary carbon steel,author come up with four new scheme using stainless steel for the replaceable stainless-steel beam link,the perforated replaceable stainless-steel beam link,the two-level yielding stainless-steel coupling beam and the perforated two-level yielding stainless-steel coupling beam in this paper.In this paper,the general finite-element software Abaqus is adopted to make analysis for link beams,replaceable link beams and the two-level yielding stainless steel coupling beam.Beyond that,the shear wall with three two-level yielding stainless-steel coupling beams is conducted analysis for nonlinear seismic performance research to make a contrast with the normal shear wall.Complete progressive analysis is reflected from the element,the component and substructure.The main works and conclusions are as follows:1.Calculated in the method based on practical engineering,27 groups of beam link models with different parameters are established and analyzed.The influence on the BLs' mechanical performance caused by different parameters is studied,including the materials in web,shaped-hole,hole quantity,hole ratio,the height ratio between web and flange,the materials in flange,which provide reference data for actual project.2.Combined with stainless-steel material performance and the law of the hole in beam link,author come up with new schemes such as the replaceable stainless-steel beam link and the perforated replaceable stainless-steel beam link,the two-level yielding stainless-steel coupling beam and the perforated two-level yielding stainless-steel coupling beam.It makes a contrast in types of the replaceable beam link and verifies the feasibility of the two-stages energy dissipation mechanism.3.13 groups of the two-level yielding stainless-steel coupling beams were established and analyzed.Web material in the first-stage energy dissipation part,length ratio between the the first-stage energy dissipation part and the second-stage energy dissipation part,width-to-thickness ratio in the first-stage energy dissipation part,height-thickness ratio in the beam,thickness ratio between web and flange,the positons of stiffening plate were compared and analyzed.Besides,9 groups of the two-level yielding stainless-steel coupling beams and 9 groups of the perforated two-level yielding stainless-steel coupling beams were analyzed for the feasibility of the two-stage yield energy dissipation mechanism.4.Author makes analysis in texted shear wall to prove the feasibility of the method of analyze by Abaqus.The shear wall with the two-level yielding stainless-steel coupling beams and the normal shear wall were analyzed for the pushover curve,overall structural deformation,the order of failure of various components,final form in concrete,final form of bar-mat reinforcement.