STUDY ON FLEXURAL DUCTILITY ENHANCEMENT OF REINFORCED CONCRETE WALLS BY TRANSVERSE CONFINING STEEL
Multistory core walls installed in high-rise reinforced concrete buildings effectively reduce seismic vibration. In high-rise buildings with the core wall system, which consists of four L-shaped core walls, the axial load of the core wall is remarkably high under the action of a diagonal seismic force. In particular, the corner and the area near the corner of the L-shaped core walls are subject to high compressive stress. Reinforcing these areas is therefore considered effective for improving the deformation capacity of the core walls. On the other hand, in wall columns with a rectangular section, the edge area is subjected to high compressive and shear stress at flexural yielding; reinforcing this area is considered to be effective for improving the deformation capacity of the wall columns. This paper examines the relationship between the confinement effect or reinforcement arrangement of these areas and the deformation capacity of the reinforced concrete walls. The evaluation was based on the results of core wall lateral loading and compression tests. Based on the results of lateral loading tests of L-, T-, H-shaped core walls and wall columns, an edge confinement index was proposed. This index is composed of the confinement effect of concrete, confinement area, axial stress, and depth-to-width ratio. The relationship between the edge confinement index and limit drift angle was shown.
shear wall core wall deformation capacity confining steel axial load
T. Nakachi
Professor, Dept. of Architecture and Civil Engineering, Architecture Major,Fukui University of Technology, Fukui, Japan
国际会议
14th World Conference on Earthquake Engineering(第十四届国际地震工程会议)
北京
英文
2008-10-12（万方平台首次上网日期，不代表论文的发表时间）