目前,FRP(纤维增强复合材料)约束混凝土强度模型大部分都是建立在FRP约束混凝土圆形柱基础之上.而FRP约束混凝土方形柱的侧向约束力受截面形状的影响较大,与圆形柱相比,由于拐角的应力集中导致的侧向约束应力不均匀等,使得FRP包裹方形柱的侧向约束效果明显降低,强度也随之下降.本文基于FRP约束圆柱体的强度公式,考虑方形柱的有效核心区、拐角效应的影响,引入对应的影响系数,建立了BFRP(玄武岩纤维复合材料)约束方形混凝土柱轴心抗压强度模型并与试验数据对比分析,结果表明,该模型具有良好的吻合度.
Currently, strength models of the concrete confined by FRP are built on ones of concrete columns confined by FRP. Compared with circular columns, the side-by-section shape makes a greater impact on square con-crete columns confined by FRP. The uneven stress of sides constraint caused by the stress concentration at the corner make effects of sides constraint of square columns wrapped by FRP reduce significantly, strength drop subsequent-ly. Based on the strength formula of cylinders confined by FRP, considered the influences of the effective core area ot square column and the comer effects,introduced corresponding and influencing coefficients, the paper buih up axial compressing strength model of square concrete coumns confined by BFRP, compared and analyzed the test data. The results suggest that the model has a high goodness of fit.
参考文献
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