Abstract
Through experiments to investigate effects of variables, such as quantity and pitch of confining reinforcement, material strength and thickness of hollow cylinders on strength and deformation characteristics of cylindrical confined concrete with hollow, equations to estimate the characteristics are derived. Main results obtained are as follows. (1) Experimental variables adopted in the tests expect thickness of hollow cylinder show similar influence on the characteristics to that in the case of cylindrical confined concrete. (2) About linear relations between effects of the thickness on the characteristics and ratios of the thickness to diameter of hollow cylinder are observed. (3) Equations for predicting strength and deformation characteristics are obtained through modifying the previous equations by authors for cylindrical confined concrete and the test results.
