【作者】 王作虎；

【导师】 刘景园；

【作者基本信息】 北京工业大学 ， 结构工程， 2006， 硕士

【摘要】 纤维增强塑料筋(以下简称纤维塑料筋)是采用多股连续纤维作为增强纤维,热固性树脂作为基体材料,胶合、挤拉固化成型的一种新型复合材料,纤维塑料筋具有轻质、高强、耐腐蚀、耐疲劳等很多优点。但是,其应力-应变关系为弹性,不具有钢筋那样明显的屈服点,所以用纤维塑料筋配筋的构件在破坏状态时的延性较差,耗能能力较弱,为了弥补这一缺点,本文采用预应力纤维塑料筋与非预应力普通钢筋混合配筋的部分预应力混凝土方案,对CFRP筋预应力粗纤维混凝土梁的抗震性能进行了研究。本文共设计了5根试件梁,试验的主要变化参数有预应力度,预应力水平和是否掺加粗合成纤维。基于碳纤维增强塑料筋(CFRP)预应力粗纤维混凝土梁的低周反复加载试验,对其受力过程、破坏形态、滞回曲线、骨架曲线、延性、刚度退化、耗能能力等抗震性能进行了较为深入的研究与分析。除了试验研究外,还采用了ANSYS通用有限元软件对试件梁进行了非线性分析。可以得到以下几点主要结论:预应力FRP筋能明显提高试件梁的承载力;影响CFRP筋预应力混凝土梁抗震性能的主要因素是预应力度,当预应力度为0.65左右时混凝土梁有较好的抗震性能和延性;对于相同预应力度的混凝土梁,当预应力水平为0.4左右时延性相对较好;掺入粗合成纤维能明显增加混凝土梁的抗震性能和延性。更多还原

【Abstract】 Fiber Reinforced Polymer(FRP) tendon,a new advanced composite material,is formed through pultrusion of epoxy-impregnated reinforced。FRP tendons have many advantages such as lightweight,high strength,corrosive resistance, fatigue resistance,and so on。However, since its stress-strain relationship is linear elastic without the yield point like steel bars, the mechanical performances and energy dissipation capacity of the beams reinforced with FRP tendons are unfavorable under the ultimate state。To eliminate the above mentioned shortcomings,the partially prestressed concrete,which combines the prestressing FRP tendons with ordinary steel bar, is adopted and carried experimental studies on the seismic performance of CFRP prestressed macro-fiber concrete beams。In this paper, 5 partially prestressed concrete beams were designed, the main variety parameters including stress degree, the level of stress and whether be mixed into macro-fiber. Based on experiments of FRP prestressed macro-fiber concrete beams under low reversed cyclic loading,failure pattern,hysteresis curves,ductility,rigidity degeneration,energy dissipation are studies systematically。And have a nonlinear analysis of concrete beams on the basis of ANSYS program in order to overcome the shortcomings of experiments。Studies show prestressed FRP tendons can obviously improve the carrying capacity of concrete beams;the main infactor influence of prestressed concrete beam’s seismic performance is stress degree,if stress degree is about 0.65,FRP prestressed concrete beams had better seismic performance and ductility;for the same stress degree,the prestressed concrete beams’level of stress is about 0.4 have better ductility;be mixed macro-fiber into FRP prestressed concrete beams can obviously improve the ductility and seismic performance of the beams。更多还原