Feasibility Study on the Application of Multiple Star and Circular Spirals to Rectangular SRC Columns

• Main Authors: C. R. Lu, 呂承儒
• Other Authors: Frank C. C. Weng
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/8ts28p

碩士 === 國立交通大學 === 土木工程系所 === 96 === A series of full-scale rectangular steel reinforced concrete (SRC) columns confined with a new type of multiple spiral cage were tested under monotonic axial compression and cyclic lateral load. The multiple spiral cage is a device of two interwoven spirals including a circular spiral at the center and a star-shaped spiral surrounding the perimeter of the column. The innovation of applying the star spiral to rectangular SRC columns is to take its advantage in concrete confinement at the four corners of the rectangular cross-section. The multiple spiral cage can be easily produced by automatic processing, which will dramatically reduce labor force and is suitable for precast construction. The major parameters of this study included the cost effectiveness of the multiple spirals, and the axial strength and seismic performance of the spirally confined SRC columns. As compared to the reinforced concrete column tied with traditional rectangular hoops, the test results revealed that, with significant saving of the consumption of the confinement steel, the SRC columns confined with the multiple spiral cage demonstrated excellent performances in both strength and ductility.