Experimental Study on Hybrid RC Columns with Continuous Fiber Sheet Tube as Stay-in-place Formwork and Transverse Confinement

本报告总结了琉球大学工程学院山川实验室1999至2001年间的研究成果。在本次研究中，研究人员得到了教育部科学体育文化部11650592、1999年科学研究资助第c(2)号的资助。在本研究中，提出了一种新的结构概念，即用预制芳纶纤维增强聚合物管代替钢管来设计具有驻留模板和横向加固双重功能的混杂钢筋混凝土柱。AFRP管材用环氧树脂浸渍芳纶纤维板，截面为方形和圆形。混合钢筋混凝土柱试件在反复水平荷载作用下进行试验，同时在恒定竖向荷载作用下进行试验。试验证明，AFRP管混凝土柱可以作为一种抗震结构构件。试验数据表明：1)AFRP管和钢箍的双重约束对改善钢筋的抗剪加固和横向约束，阻止保护层混凝土的剥落，提高混杂钢筋混凝土柱的强度和延性具有良好的效果。2)对于AFRP管和钢箍双重约束的混杂钢筋混凝土柱，当计算的抗剪强度和粘结强度超过计算抗弯强度时，可以保证延性受弯破坏。

This report concludes research results obtained by the investigators at the Yamakawa Laboratory, Faculty of Engineering, University of the Ryukyus from 1999 to 2001. During conducting this research project, the investigators has received financial support from the Ministry of Education, Science, Sports and Culture,Grant-in-Aid for Scientific Research c (2), 11650592, 1999.In this research, a new structural concept has been proposed for design of hybrid RC columns with premanufactured Aramid Fiber Reinforced Polymer (AFRP) tube, instead of steel tube, which performs dual function of stay-in-place formwork and transverse reinforcement. The AFRP tube impregnated aramid fiber sheet with epoxy resin, and had square and circular cross sections. Hybrid RC column test specimens were tested under cyclic lateral load while simultaneously subjected to constant vertical load. It was proved experimentally that the AFRP tubed concrete column can be utilized as a kind of seismic structural member. The experimental data made the following remarks.1) The double confinement of the AFRP tube and steel hoops has a beneficial effect on improving the shear reinforcement and transverse confinement, ceasing the spalling of the cover concrete and enhancing the strength and ductility of the hybrid RC columns.2) For the hybrid RC columns doubly confined by the AFRP tube and steel hoops, ductile flexural failure can be ensured when the calculating shear and bond strengths exceed calculating flexural strength.