Research On Design Method And Key Technology For Stiffness-tandem Energy Dissipation Coupling Beam Structure

The reinforced concrete shear wall structure is one of the most commonly used types of tall building structure.Energy dissipation technique as an effective means to control the structure vibration response are increasingly used in reinforced concrete shear wall structures.The coupling beam as an important component of reinforced concrete shear wall structure plays important roles as follows: increase structural lateral stiffness,transfer load and displacement between wall limbs,act anti-seismic first defendant line,consume vibration energy under strong motion.Due to the importance of the coupling beam,the routine coupling beams,oblique cross dark pillared reinforcement coupling beam,diamond reinforcement coupling beam,oblique cross reinforced coupling beam,a pair of beams,stiffness coupling beam,stiffening beam,attached steel plate energy dissipation coupling beam,energy dissipation coupling beam with stiffness tandem type and so on have been put forward by domestic and foreign researchers since the 1960 s.The reinforced concrete-mild steel damper stiffness tandem type energy dissipation coupling beam(hereinafter referred to as energy dissipation coupling beam with stiffness tandem type)as a new technique of energy dissipation for reinforced concrete shear wall structure is adopted gradually by many projects.The design plan of energy dissipation coupling beam with stiffness tandem type is researched by domestic and foreign scholars since the 1990 s.But the research results focus on type design of damper mainly,and few people research the spatial location optimization of dampers.Based on the overseas and domestic research status,the design concept,technology and spatial location optimization of coupling beams are analyzed.The main research works in this dissertation listed as follows:1.The coupling beam mechanics characteristic of reinforced concrete shear wall structure and working mechanism of energy dissipation coupling beam with stiffness tandem type are summarized and analyzed.First of all,the damage characteristics and shear stress distribution law along section height direction of coupling beam are analyzed.Then,on the basis of the principles of ductility design,the reasonable value range of coupling ratio for coupled shear wall is determined.Finally,according to the working principles of building structures damper,combining distribution characteristics of internal force and damage characteristics of coupling beam,the working mechanism of energy dissipation composite coupling beam are analyzed.2.Based on the response spectrum theory,calculation formula of damping effect correction coefficient for velocity response spectrum considering many factors are fitting,and the working principles of damping systems are analyzed.The correlation theories of seismic response spectrum are introduced.The working mechanisms and applicable scopes of two damping systems are analyzed then.The damping principles of two systems are analyzed in detail based on of response spectrum theories.Finally fitted velocity response spectrum damping effect correction coefficient calculation formula based on the strong earthquake records.3.Puts forward and analyses the basic theory of seismic reduction performance curves,curves constructing method and curve form for stiffness-tandem seismic reduction structures,and set up the preliminary design method for stiffness-tandem seismic reduction structures based on seismic reduction performance curve.Deduced the calculation formula of equivalent damping ratio and equivalent period for single degree freedom seismic reduction system according to mechanical model,corresponding hysteresis curve and the basic principle of the equivalent linearization method of elastic-plastic response spectrum.And then determined method and key technology of making the seismic reduction performance curves,established the seismic reduction performance curves of stiffness-tandem seismic reduction structures,and discussed the engineering application value of seismic reduction performance curves.Proposed the design method and design process based on seismic reduction performance curves of stiffness-tandem seismic reduction structures.4.Proposed the distribution design method,design principle and design calculation formula along with the vertical layout of the reinforced concrete shear wall structure for the mild steel damper.Researched the distribution principle and method of damper stiffness along the height of strurcture for multiple degrees of freedom seismic reduction structure based on seismic reduction performance curves.The physical meaning of each vertical layout principle and the relationship between every principle is analysed detailedly.The stiffness and ductility coefficient distribution calculation formula for dampers of each structure layer is deduced.5.The layer arrangement principle in reinforced concrete shear wall structure,design method,design principle and calculation formulas of mild steel damper are proposed.The basic arrangement principles of damper along structure horizontal direction are given.Based on actual working performance of coupling beam and the mechanics characteristic of mild steel damper,three design principles of metal damper for energy dissipation coupling beam with stiffness tandem type are put forward.The method and formula corresponding kinds of damper are deduced respectively according to the mechanics theories and material properties.6.This article is adopted to establish the design method of the structure of the energy dissipation damping,of a typical reinforced concrete shear wall structure optimization design for energy dissipation damping and use Seismostruct finite element analysis software for elastic-plastic time history analysis have been carried out to verify the design results,test results show that the identified tandem energy dissipation suspension stiffness method is scientific and reasonable design,reliable results,has engineering practical value.6.The energy dissipation design of a typical reinforced concrete shear wall structure is optimized by using the energy dissipation design method established in this paper.And the design results are validated by elastic-plastic time history analysis method by using Seismostruct finite element analysis software.The results show that the design method of stiffness-tandem energy dissipation is scientific,reasonable and reliable,also has engineering practical value.