【摘要】 FRP筋(Fiber Reinforced Plastics)是通过拉挤工艺胶合高强纤维形成,具有强度高、重量轻、耐腐蚀、无磁性等优良性能,可作为加强材用于盐害地区、海洋工程等条件严酷混凝土结构中,不仅可以解决钢筋锈蚀问题,提高结构的耐久性和使用寿命,而且还可以显著降低结构自重。提出将FRP筋应用于预应力混凝土桥梁结构最好选择无粘结预应力技术的观点,应用等效的塑性区长度来计算无粘结预应力结构FRP筋的极限应力,为结构极限强度分析提供必要技术指标。更多还原

【Abstract】 Fiber Reinforced Plastics bar is formed by bonding high strength fiber through pultrude technology,which possesses excelent performances of high strength,light weight,corrosion resistance and antimagnetic,etc.It can be used as reinforced material in concrete structure in rigorous conditions such as salt damaged region and ocean engineering,etc.Therefore,the application of FRP bar not only solves the problem of steel bar corrosion and heighten structural durability and service life,but also reduces structural self weight remarkably.This paper thinks that adopting unbonded prestressing technology for prestressed concrete bridge is the best option.Applying equivalent length of plastic zone to calculate ultimate stress of unbonded prestressing structure can supply necessary technical indexes for ultimate strength analysis.更多还原