Evaluating method of axial load carrying capacity of reinforced concrete columns failing in shear considering reinforcing details

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Final objective of this study is to prevent pancake type collapse of R/C old buildings during sever earth quake. For this purpose axial load carrying capacity of columns failing in flexure have been studied. In this study the scope was extended to shear failing columns, axial load capacity under residual deformation and effects of reinforcing details. Ten R/C specimens with square sections were tested. Two types of specimens were made with varying only reinforcing details. The hoop of H-series had 135 degrees hook. And the hoop of P-series had 90 degree hook details. Another main variable was loading methods ; i.e.monotonic centric axial loading, eccentric axial loading under constant lateral drift and normal reversed lateral loading under constant axial load. Main conclusions were as follows. (1)Specimens with high axial load lost scheduled axial load far before it's axial deformation reached axial load-axial deformation relation of specimen with centric axial load. On the other hand, Specimens with low axial load lost scheduled axial load when its axial deformation reached axial load-axial deformation relation of specimen with centric axial load. (2)There was little difference of behavior between specimens with normal reinforcing details (H-series) and those with poor reinforcing details (P-series).