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根据混凝土受压应力-应变的常用曲线方程,对压弯截面压区混凝土应力图形进行矩形等效,推导出等效矩形应力图形参数的一般表达式。选取GB50010—2002《混凝土结构设计规范》、欧洲规范以及Hognestad三者建议的应力-应变模型,计算得到各模型的等效参数值,并在此基础上对比分析了各模型截面压弯承载能力理论结果与试验结果的关系。分析表明,3种模型的应力-应变关系对截面承载能力影响不大,欧洲规范模型的理论值略大于其它两个模型的5%;各模型承载能力的理论值与试验结果均吻合较好。
According to the common curve equation of compressive stress-strain of concrete, the stress-strain curves of concrete with compressive-bending cross-section are rectangularly equivalent, and the general formula of equivalent rectangular stress graph parameters is deduced. Select the GB50010-2002 “Design Code for Concrete Structure”, the European norms and Hognestad recommended stress-strain model to calculate the equivalent parameters of each model, and on this basis, comparative analysis of the model section bending load carrying capacity theory Relationship between results and test results. The analysis shows that the stress-strain relationship of the three models has little effect on the bearing capacity of the section, and the theoretical value of the European standard model is slightly larger than 5% of the other two models. The theoretical values of the carrying capacity of each model are in good agreement with the experimental results.