EARTHQUAKE RESPONSE PROPERTIES OF REINFORCED CONCRETE BUILDINGS WITH SHEAR WALLS

The reinforced concrete buildings with the base rotating shear walls recently have been recognized that it becomes harder for the shear failure to occur, and that expected well ductile. However, the behaviors of base rotation of a structural wall are not clearly understood. This paper examines fundamental response properties of frames, the relationship between frames and constituent members and the effect of reinforcement ratio of members on the horizontal deflections and the ultimate strength of frames. A seven-story reinforced concrete building with shear walls on footing foundation was chosen as a prototype one. The results obtained here could be summarized as follows: (1) Regardless of seismic loading, there was a good similarity between the hinge formation patterns at ends of member of structures in the same story deformation level. (2) Between the maximum ductility factor of boundary beam and the maximum interstory deflection angle had a plain linear relation. This relationship suggests the possibility estimating frame deformations subjected to earthquake by the deformation ability of boundary members. (3) While the reinforcement ratio of boundary column had little effect on story displacements and ultimate strength of buildings, the reinforcement ratio of column with wall had large one. Furthermore, the poor reinforcement ratio of wall had the possibility developing of plastic hinge at ends of wall members.