Comparative Research On Seismic Performance Of RC Frame-shear Wall Structure With Two Types Of Energy Dissipation Coupling Beams

Frame-shear wall structure system is widely used in high-rise building. Accordingto thedesign idea of “strong wall limbs-weak coupling beam”, the coupling beamsshould yield before wall limbs to dissipate energy underrare earthquake, which alsoreduce the structural stiffness and the input of seismic energy. But the coupling beamswith small span-depth ratio are prone to brittle fracture, result in the limit of the energydissipation capacity. Once the damage occurs, it is so difficult and costly to repair thecoupling beams that the structure can’t be fast recovery after earthquake. Therefore,there is great theoretical and practical significance to research on energy dissipationcoupling beam which has good ductility and energy dissipation capacity, and makes thefailure mode more reasonable.To solve the above problem, the paper proposes to install the steel slit damper orshape memory alloy (SMA) damper in the coupling beam. The damper is a kind ofenergy dissipation device to control the structural vibration response.The steel slitdamperhas advantages of easy produce, high energy consumption and low cost.Because of the superelastic behavior of NiTi, the SMA damper has the capacity ofself-centering that the plastic deformation can restore within a range. By means ofparametric analysis, the reasonable design parameters that can make deformation anddamage concentrate in damper are obtained. The ideal damage mode of theframe-shear wall structure is: the damper yield, yield of the reinforcement in thecoupling beam, yield of the reinforcement in the frame beam, yield of thereinforcement in the coupling beam, yield of the reinforcement atbottom of the wall.The main contents of the dissertation are as follows:(1) Based on the former research, the dissertation advises to install the steel slitdamper or SMA damper in the center of the coupling beam. According to themechanical design of two types of energy dissipation coupling beams with dampers, thecommon design parameters (yield force ratio and yield displacement ratio) areproposed.(2) The finite model of the energy dissipation coupling beam with steel slit damperis established by Abaqus. Static monotonic and cyclic loading are applied on the model.Influence of the design parameters on its mechanics performance and damage mode isaddressed. Compared with the coupling beam with SMA damper, the paper discussestheir characters ofmechanical behavior, deformation behavior and damage mode.(3) A18-story frame-shear wallplanner structure is utilized. The steel slit dampersor shape memory alloy (SMA) dampers are installed in the coupling beam at each story. Static monotonic and cyclic loading are applied on the two types of structure withdifferent parameters. Influence of design parameters on the mechanics performancedamage mode and energy dissipation capacity of the whole structure is addressed. Onthe basis of the summery on seismic performance, the dissertation gives the designsuggestions on RC frame-shear wall structure with two types of energy dissipationcoupling beams.