Model test of hollow circular reinforced concrete bridge column under seismic force

• Main Authors: Shu Chi-Chung, 許志強
• Other Authors: Kao
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/25849790549517505192

碩士 === 國立臺灣大學 === 土木工程學研究所 === 87 === In this study , we aimed at the flexure ductility and shear capacity for hollow circular reinforced concrete bridge column .First , we reviewed some studies on the confinement effects and shear capacity evaluate code, and we do some analysis about the topic purpose we concerned . Reduced scale model tests were proceeded to compare with the theoretical prediction , and verify if the analyses were applicable or not. By the way of changing the height-depth ratio(type L:4.63 , type M: 2.78 , type S:2.22)to induce different failure mode , we manufactured three column types ( type L 250cm , type M 150cm , type S 120cm) with the same outer diameter 54cm and inside diameter 27cm . The confinement arrangement we used have longitudinal bars and circular hoops on both outer and inner side , furthermore , between outer and inner longitudinal bars steel ties were configured . Horizontal force was applied by reciprocate cyclic load , and on the top of column constant axial force about 0.8 was applied to simulate the dead weight of the upper structure. Applying the stress-strain model for confined concrete which Hoshikuma & Kawashima announced in 1998 and basic mechanics hypotheses, we edit an program to evaluate the moment-curvature relation curve. Refer to several suggested code for estimating the shear capacity to evaluate the curve for shear-ductility relationship. According to the result of test, hollow circular bridge column’s ductility can reach about 5 to 6, and the flexure moment-curvature analysis by use of Hoshikuma & Kawashima model can make a good prediction. Finally, we exam the codes suggested for shear capacity, we find out that the code suggested by Priestly, Verma & Xiao is most reliable.