运用层板理论、平截面假定和平衡条件对FRP管混凝土梁柱构件进行了理论计算,分析了轴压比、径厚比、混凝土强度、配筋率和铺层角度对弯矩-曲率曲线的影响以及FRP配置率与弯矩-轴力相关曲线关系.部分理论分析与试验结果作了比较,弯矩-曲率曲线吻合较好.计算表明,FRP管混凝土组合结构能有效地提高构件的承载力,并由于FRP管的约束作用而提高混凝土强度和延性;弯矩-曲率曲线为双线性,第一刚度取决于混凝土刚度,第二刚度取决于FRP壳体刚度;当径厚比较小时轴压比对弯矩-曲率曲线影响较小,当径厚比较大时,随着轴压比增加,弯矩和极限曲率先增后减;配筋率增加则极限弯矩提高,耗能能力增加;随着纤维与杆件纵轴的角度减小,第二刚度和极限弯矩提高.
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