EXPERIMENTAL STUDY ON SEISMIC BEHAVIORS OF REINFORCED CONCRETE FRAME STRUCTURE WITH FRICTIONALLY DAMPED INFILL WALL

摘要

In this paper,a new-type frictionally damped infill wall(FDIW)developed by the authors recently was presented,and low cyclic reversed loading tests for FDIW-frame,bare frame and conventional infill wall-frame were carried out.Based on test results,the hysteretic behavior,bearing capacity,deformation capacity,rigidity degradation,energy dissipation and damage characteristic of the specimens were studied comparatively.It is found that FDIW contributes to the hysteretic energy of structure with its masonry units sliding frictionally,and plays good role in energy dissipating.The hysteretic curve of frame filled with FDIW is plumper shuttle,the energy dissipation capacity is excellent,the equivalent viscous damping coefficient reaches above 0.1.Also,FDIW can provide lateral resistance force for its surrounding frame,enhance structure's horizontal bearing capacity,strengthen structure's initial stiffness obviously,but its confined effect is much weaker than that of conventional infill wall which prevent frame columns from shear failure and avoid itself damage seriously.Furthermore,the ductility of frictionally damped in-filled frame is markedly improved from conventionally in-filled frame.The ultimate inter-story drift ratio of FDIW-frame is above 1/50 of the specification limit,achieving the plastic deformation demand of frame structure under a strong earthquake.