Steel Hysteretic Damper And Its Application In Seismic Design Of High-rise Shear Wall Structure

The traditional structural seismic design method focuses on increasing thestrength, stiffness and ductility of components, and leads to servere damages ofcomponents during strong earthquake. This is the passive seismic strategy.However, another active method by employing different kinds of dampers is morereasonalble and effective.Under the guidance of conceptual design of structure, the main content ofthis paper is arranging the new composite coupling beam reasonably but notchanging the original overall arrangement of structures to satisfy theseismic-resistance demand which is half or one degree more than the originalfortification intensity. The new composite coupling beam is formed throughinstalling the steel hysteretic damper in coupling beams of shear wall structure,according to the deformation features of the entire structure and coupling beamunder the seismic action. The specific research work is summarized as follow.1. This paper summarizes seismic damage characteristics of shear-wallstructures and the current research situation of the seismic energy dissipationtechnique and application.2. The energy dissipation principals of steel hysteretic damper are analyzedand the plasticizing process and yield mechanism of the structure systems aresummarized. It's worth noting that the yield mechanism of high-rise shear wallstructure based on the seismic energy dissipation technique is illustratedemphatically.3. Pseudo-static tests involving two simplified structure models are carried,one is called wall limb-coupling beam-damper test model which install the steelhysteretic damper in coupling beams, and the other is wall limb-coupling beamtest model. The pseudo-static tests verify the hysteretic energy dissipatingcharacteristics of damper and how the damper controls the response of structuremodel.4. A practical high-rise shear wall structure is designed based on the seismicenergy dissipation technique and the corresponding structure model is establishedand carried the time history analysis by ETABS software. According to thedeformation features of the high-rise shear wall structure and referring to thedesign parameters of the coupling beam, some dampers are arranged in thecoupling beams located in the floors which deformation is relatively greater, with the propose of making the analysis result satisfy the code demand, achieving theprospective design target, that is, increase the seismic capacity of the structurearranged some dampers optically from8to8.5degree.5. This paper summarizes and analyzes how the overturning momentinfluence high-rise structures, and the simplified calculation of the overturningmoment of the bottom floor is carried for the original structure and the otherstructure which applies the seismic energy dissipation technique, both structuresare under the horizontal rarely-met seismic action corresponding to the differentseismic fortification intensity, taking a practical building for example and inaccordance with the static equivalent principal. Through the process as illustratedbelow, the bearing capacity of the wall limb of the bottom floor under the actionof the overturning moment is verified and compared.