摘要
首先针对钢-连续纤维复合筋(SFCB)的特点设计了一套单向拉伸的试验装置和方法,然后对工业化制备的SFCB制品进行了单向拉伸试验,观察其破坏过程和破坏特征,测定其初期弹性模量、二次刚度、屈服强度、极限强度。试验结果表明,SFCB的应力-应变关系曲线在纤维断裂前呈现出明显的双折线,钢筋屈服后SFCB具有稳定的二次刚度。根据材料的复合法则推导出SFCB单向拉伸的理论计算模型,并与试验数据进行比较,发现吻合得较好,证明了可以根据复合法则对SFCB的性能进行预测和设计。
In this paper, a uniaxial tension test device and methods for steel fiber composite bar （SFCB） is firstly designed, and then the uniaxial tensile tests of the industrialized SFCB products are carried out, the process of destruction and damage characteristics are observed, their initial modulus of elasticity and post-yielded stiffness, the yield strength, ultimate strength, ect. are determined. The results showed that the stress-strain curve of SFCB before its outer fiber fracture is a clear double broken line and has a stable post-yielded stiffness after its core steel bar yielded. According to the mixing rule, the theoretical models for stress-strain curve of SFCB under uniaxial load are derived. The theoretical calculation is in good agreement with experimental results. It proves that the performance of SFCB could be predicted and designed based on mixing rule.
出处
《工程抗震与加固改造》
北大核心
2009年第1期1-7,共7页
Earthquake Resistant Engineering and Retrofitting
基金
国家自然科学基金项目(50608015)
国家973计划(2007CB714200)
国家十一五科技支撑计划(2006BAJ03B07)
