摘要
钢-连续纤维复合筋（Steel Fiber Composite Bar，简称SFCB）是一种以钢筋为内芯外包纵向纤维的新型增强材料，具有较高的弹性模量、稳定的二次刚度及优异的耐腐蚀性能等特点。本文基于10个标准拉拔试件对SFCB与混凝土之间的粘结性能进行了研究，结果表明：SFCB与混凝土的粘结强度约为相应带肋钢筋的94％；拉拔试件的破坏形态可分为钢筋内芯屈服后SFCB拔出、钢筋内芯屈服前SFCB拔出和SFCB拉断3种；钢筋内芯屈服后SFCB拔出试件应力峰值点对应的自由端滑移值为1．76～1．84mm。本文所用SFCB为首次工业化制备出的复合筋，其粘结性能有一定的离散性，可以通过表面喷砂、表面缠肋以及变化肋的缠绕方向、间距和深度及制作工艺的进一步改善、成熟和稳定等方法来改善SFCB与混凝土的粘结性能。
Steel Fiber Composite Bar （SFCB）, a new kind of reinforcing material, is made up of steel wrapped by fiber reinforced polymer （FRP） in longitudinal direction, with high elastic modulus, stable post-yield stiffness and excellent corrosive resistance. The bond behavior between SFCB and concrete is analyzed in this paper based on ten standard pullout tests. The results show： bond strength between SFCB and concrete is approximately 94% of that of corresponding ribbed rebar; there are three failure modes including SFCB pulling out after steel yielding, SFCB pulling out before steel yielding, and SFCB rupture; the free end slip is 1.76 ～ 1.84ram corresponding to the peak bond stress when SFCB pull out after yielding. Since the industrial production of SFCB is the first time, there is some variation of bond behavior, which can be improved by sandblasting, yarn wrapping, changing of the wrap direction, distance and depth and further improvement of production technology.
出处
《工程抗震与加固改造》
北大核心
2009年第1期21-27,共7页
Earthquake Resistant Engineering and Retrofitting
基金
国家自然科学基金(50608015)
国家“973”计划(2007CB714200)
国家十一五科技支撑计划(NCET-07-0184)
