玄武岩纤维约束预压混凝土的应力-应变模型

针对实际工程中对结构构件进行现场加固时不能卸载这一现象,开展了玄武岩纤维片材(BFRP)约束预压混凝土方柱的轴压性能试验,并重点分析了试验所得应力-应变曲线,通过研究发现其形式接近抛物线,结合前人研究确定了抛物线加直线的应力-应变模型。通过对试验数据的处理,进一步得出抛物线顶点对应的峰值应力及峰值应变的计算模型,再加上一定的理论推导,最终得出完整的应力-应变模型。此模型的优点在于考虑了试件加固之前所受荷载的影响,同已有众多模型相比,与工程实践更为接近。

Stress-strain model for BFRP-confined preloaded concrete

For the reinforcement of structural member on site,the member can not be unloaded.So this paper studies BFRP constraint preloaded square concrete column under uniaxial load.The stress-strain curve of the specimen is deeply researched into.It is found that the curve is close to the parabola.Based on previous researches,the model of parabola plus linear is determined.Through the processing of test data,the model of peak stress and strain of the parabola vertex is obtained.Moreover,with the theoretical derivation,the complete stress-strain model is obtained.The preload taken into account,the model is closer to actual engineering compared with other models.