PC鋼棒による能動的横拘束を利用したRC柱の耐震補強法に関する研究

概要

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A number of seismic retrofit techniques have been developed in order to prevent collapse of the buildings and bridges, which were constructed according to the old seismic design code, from earthquake attack. The seismic retrofit techniques are classified into three categories, namely, improving ductility, strength and reduction of seismic load. By paying attention to the fact that the transverse confinement of concrete is very useful in order to improve ductility for RC members subjected to compression, a new seismic retrofit technique is proposed as one of improving ductility for RC columns in this paper. The technique is an active confinement by PC bar prestressing. There are two arrangements in this seismic retrofit technique. One is to arrange PC bars through corner blocks or corner angles around the RC column as if external hoops and then to introduce prestressing by torque wrench. The other one is to arrange diagonal braces by PC bars in addition to the above-mentioned PC bar prestressing on the top and bottom parts of RC column in case of very short columns. Both techniques are easy to apply to the seismic retrofit of columns with or without wall or window and also beam-column connections. The purposes of this investigation is to clear the effectiveness of the column retrofit technique by PC bar prestressing and to put this new technique into practical use.
琉球大学工学部の論文