预铸复合螺箍SRC柱之轴压行为研究

开展了一系列大尺寸钢骨钢筋混凝土矩形柱的轴压试验,旨在探讨新型的复合螺旋箍筋或“尹氏螺箍”在矩形SRC柱之使用效益。由于“尹氏螺箍”采用自动化加工制造,可大幅降低箍筋绑扎之人力及缩短工期,极具经济效益,很适合用于预铸工法。依据力学原理探讨SRC柱箍筋用量的合理性,研究参数包括箍筋的型式、间距及钢骨之型式、SRC柱之轴压强度与韧性。由于SRC柱内部的钢骨亦能够围束混凝土,有助于降低SRC柱箍筋之需求量,达到更经济的设计结果;且螺旋箍筋对混凝土的围束效果比传统水平闭合箍筋更好,可提升柱之强度与抗震能力。试验结果显示,配置新型五螺箍之SRC柱可以发展出良好的强度与韧性,且具备良好的经济效益。研究并建立了一组适合这种新型SRC柱之围束箍筋设计方法,以提供学术界与工程界参考。

Axial Compressive Behavior of Precast SRC Columns With Multi-Spirals

Presented herein is an experimental study on the axial compressive behavior of rectangular SRC(steel reinforced concrete) columns confined with a new type of multi-spiral cages.The multi-spiral is a device of five interconnected spiral cages,named "5-Spirals" or "Yin's Spirals" in this study,with a large spiral at the center and four small ones at the corners.The innovation of applying the 5-spirals to rectangular SRC columns is to take its superiority in concrete confinement and its efficiency in automatic production for the precast construction industry.The major parameters of this study included the cost effectiveness of the multi-spirals,and the strength and ductility of the spirally confined SRC columns.As compared to the reinforced concrete column tied with traditional rectilinear hoops,the test results showed that,with significant cost savings of confinement steel,the SRC columns confined with 5-spirals demonstrated excellent performances in both strength and ductility.