Experimental Analysis And Modeling Study On Seismic Performance Of HSCC-T Short-limb Shear Wall

Short-leg shear wall structure is a relatively novel structural form,but it has less practical engineering applications in areas with high seismic intensity.The "High Regulations" also imposes strict restrictions on its application.Therefore,in order to fully improve the The seismic performance of the structure,using its favorable parameter indicators to better guide production and design practice,lays a solid foundation for the expansion of its practical application and promotion.With the upgrading of the strength level and performance of building materials,the use of highstrength materials in buildings can improve seismic performance.Therefore,in accordance with the above objectives and combined with the current research status and conditions of the research group,this article mainly focuses on the short-leg shear wall specimens equipped with high-strength steel bars of conventional strength grade concrete(hereinafter referred to as HSCC-T,not repeated below).Repeated load tests,objectively evaluated its seismic performance,and then through the establishment of a nonlinear finite element numerical model and a four-fold line hysteresis model,this research is important for enriching and improving the existing short-leg shear wall seismic theory and technology and corresponding engineering applications The theoretical and engineering practical significance of this article can provide certain technical support for the engineering application of short-limb shear walls in strong earthquake areas and frequent earthquake areas.The main tasks completed in this paper are as follows:(1)The existing seismic theories,methods,tests,engineering applications and corresponding research results of short-limb shear walls at home and abroad are sorted out,and the main research content of this paper is put forward for the current problem of insufficient seismic performance of ordinary short-limbed shear walls.And technical route.(2)Completed the production of 6 specimens of HSCC-T cross-section short-leg shear wall specimens with a ratio of 1/2 and carried out low-cycle repeated load tests on them,focusing on the analysis of the axial compression ratio and the high section thickness.The degree of influence of factors such as the ratio of stirrup reinforcement on the bearing capacity,ductility,stiffness,hysteresis characteristics and other seismic performance indicators of the specimen.The weak location,failure mechanism and failure mode of the short-leg shear wall are clarified.Relevant design improvement suggestions.(3)Established 6 short-leg shear wall numerical entity models through the ABAQUS finite element analysis software,introduced the modeling process,and verified the reliability of the finite element analysis on the basis of comparison with the test.Design parameters such as ratio,section height-to-thickness ratio,stirrup ratio,stirrup strength,longitudinal reinforcement strength,concrete strength,edge restraint member reinforcement length,range and other design parameters,obtained the favorable design parameter range of short-leg shear wall,and expanded the test As a result,the finite element model was optimized by adding round steel pipes at the ends of the web,and it was concluded that its seismic performance could be greatly improved.(4)Through theoretical research and data fitting of the restoring force characteristics of the test hysteresis curve,the relationship between forward and backward loading stiffness,forward and backward unloading stiffness and elastic stiffness is given,and the hysteresis rule is established.A four-fold hysteresis curve analysis model suitable for HSCC-T short-leg shear wall is presented.This model can better reflect the restoring force characteristics of the structure and can be used for the elastic-plasticity of HSCC-T short-leg shear wall structure.Response analysis.Through the calculation of the peak load,it is found that it is similar to the actual bearing capacity of the wall,which indicates that the application of the concrete structure design code to calculate the HSCC-T short-leg shear wall of this type is effective,and it can be used for this type of new structure short.The calculation of the bearing capacity of the pier shear wall provides a certain reference basis and reference.(5)The shell finite element model was established by applying SAP2000 finite element software to the actual engineering of a 14-story high-rise short-leg shear wall structure,and the modal analysis and the effects of octave frequent earthquakes and octave rare earthquakes were carried out.Time history analysis,the calculation results are compared with the calculation results of YJK software to determine the reliability of the established model;through the octave rare earthquake elastoplastic time history analysis,the interlayer displacement angle envelope curve of the structure and the displacement time of the structure vertex are obtained The curve shows that the shortleg shear wall structure has good mechanical performance and can meet the fortification requirements of not falling under a major earthquake.