Study On Seismic Performance Of Shear Frame Structure System With Metallic Rubber Dampers

With the acceleration of China's social-economic development and urbanization,high-level and high-rise buildings appear more and more pervasive. Reinforced concrete frame-shear wall and frame-tube structure have become the preferred structure of the high-risebuildings. There is no doubt that the study about the seismic performance of shear wall,whichis the main component of frame-shear wall and frame-tube structure, has great theoreticalsignificance and important practical value. Shear wall structure, with greater overall stiffness,is likely to cause stress gathering and the occurrence of brittle shear failure under theearthquake. So it is profoundly important to improve the structure's seismic performance, toreduce the irreversible cumulative plastic seismic damage of the component for the safety ofstructure, and to reduce the economic losses caused by post-earthquake rehabilitation.According to the concept of ductility seismic design, coupling beams in shear wall structure arerequired to yield prior to the damage of wall limb. However, damage in coupling beams resultsin repair cost post earthquake and even in some cases, it is difficult to repair the couplingbeams if the damage is severe.According to above background, this article is based on the studies of Metallic Rubber(MR) damping materials which the deformation of the dampers can recover automaticallyafter earthquakes, the new energy-intensive shear wall coupling beam design and the nonlinearmechanical properties. At the same time, it also concentrates on the nonlinear seismic responseanalysis based on the MR damper energy coupling beams-frame shear wall structure, themechanism of the passive energy dissipation, the structural damage indicators and the failuremode and so on.(1) Studying the preparation of the MR. The compression and shear mechanical propertiesof stainless steel MR specimens with various nominal densities were test under the static anddynamic loads. During the tests, the influence of several important factors, such as nominaldensity, strain amplitude, cyclic number and speed of loading and the ambient temperature,onthe mechanical behavior of MR were addressed.In order to establish a material constitutivemodel and to provide the basis for the development about the new energy-consuming devicesof the MR, several researches are conducted such as the hysteretic energy performance and thedamping mechanism.(2) Establishing the stiffness hardening constitutive model of MR, developing materialsubroutine. The subroutine which can be used to simulate a variety of stiffness hardening constitutive relations is added to the finite element analysis ABAQUS software materiallibrary.Loading the seismic waves to the single-pole and shearwall model of MR to test theaccuracy of the subroutine.(3) Putting forward to the conceptual design and theoretical models based on the new typeof energy-consuming coupling beam of two-way pusher-over bar MR sleeve damper. Thisresearch take12-storey reinforced concrete coupled shear wall and18-storey reinforcedconcrete frame shear walls for example, the coupling beams connecting wall limbs are split inthe middle, and the dampers are installed between the ends of the two cantilevers. Then therelative flexural deformation of the wall limbs is transferred to the ends of coupling beams andthen to the MR dampers. Establishing a high precision and high computational efficiency finiteelement model based on ABAQUS software. It conducts intensive research for the differentparameters of the MR damper coupling beam-shear wall's nonlinear seismic responsesimulation analysis. Analytical results indicate that the displacement and acceleration responsesof the shear wall structure with MR dampers are reduced remarkably.(4) Researching on the seismic failure mode of the new type of energy-consumingcoupling beam-frame shear wall of MR damper. Quantify the failure mode with damage indexof whole structure, studying the influences on the structure's failure mode and theenergy-consuming distribution under different parameters of MR damper. Analytical resultsindicate that the appropriate parameters of MR damper can make the failure mode of structuremore reasonable.This paper which comes up with a new way of seismic resistance to the shear wallstructure has great theoretical significance.