【摘要】 目的为提高预应力FRP布加固钢与混凝土组合梁的承载力,增加其刚度减小变形.方法考虑预应力FRP布钢与混凝土组合梁的结构与受力特性,利用平截面假定和应变变化计算方法,对预应力FRP布加固组合梁承载力进行分析.结果相比一般FRP布加固钢与混凝土组合梁,预应力FRP布能更有效改善其受力性能;给出其抗弯极限承载力计算公式.结论提出利用预应力FRP布加固钢与混凝土组合梁的方法是切实可行的;所建立的预应力FRP布加固钢与混凝土组合梁抗弯承载力理论计算公式具有合理性.更多还原

【Abstract】 The design characteristics of steel-concrete composite beams can be enhanced significantly by epoxy bonding fiber reinforced polymers(FRP) sheets to the critically stressed tension areas.Compared with the general strengthening technology using FRP sheets,the strengthening technology using prestressed FRP has a great many of merits:it exerts high strength on FRP effectually,decreases the bending deformation of steel-concrete composite beams and improves the bending performance in the regular service course.Analyzing the structure and bearing characteristics of steel-concrete composite beams strengthened with prestressed FRP sheets,failure modes are considered according to steel yielding and strain of compressive concrete reaching extremum.Furthermore,bend-bearing capacity calculation formulas are established with regard to neutral axis in different position.更多还原