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针对目前实际工程中常用钢纤维掺量已降低至80kg·m-3以下,而现有的研究成果已不能完全为其应用提供依据的状况,设计了24组配筋低掺量钢纤维自应力混凝土棱柱体试件,开展钢筋和钢纤维共同限制作用下的自应力混凝土受拉性能的试验研究。试验通过拉伸试件中心配置的钢筋,由测试得到的荷载-应变曲线推导得出钢纤维自应力混凝土受拉应力-应变全曲线。在全曲线的推导过程中,依据对钢纤维自应力混凝土膨胀初始自应力值的研究,把自应力消压(抵消初始自应力)过程引入到钢纤维自应力混凝土受拉应力-应变全曲线中,并建立了配筋低掺量钢纤维自应力混凝土受拉应力-应变全曲线公式;同时根据试验结果统计回归曲线中的相关参数。研究结果表明:所建立的全曲线表达式是一条完全不同于普通混凝土受拉应力-应变的曲线,其上升段是与配筋率和钢纤维掺量有关的多项式,下降段是仅与钢纤维掺量有关的负指数表达式。
In view of the fact that the commonly used steel fiber content in practical engineering has been reduced below 80kg · m-3, the existing research results can not completely provide the basis for its application. The design of 24 sets of low-added steel fiber reinforced self-stress EXPERIMENTAL STUDY ON TENSION BEHAVIOR OF SELF-STRESS CONCRETE UNDER COMMON LIMITATIONS OF REINFORCED AND STEEL FIBER UNDER CONCRETE PRECURSORS. The tensile stress-strain curves of steel fiber reinforced self-stressing concrete are deduced from the tensile-stress curves of the specimens by pulling the reinforcing bars arranged in the center of the specimens. Based on the study of the initial self-stress of steel fiber self-stressing concrete during the process of deriving the full curve, the process of self-stress elimination (counteracting initial self-stress) is introduced into the tensile stress-strain curve of steel fiber self-stressing concrete , And the formula of tensile stress-strain curve of reinforced concrete with low content of steel fiber reinforced with self-stressing steel was established. At the same time, the relevant parameters in the regression curve were calculated according to the test results. The results show that the established whole curve expression is a curve completely different from the tensile stress-strain curve of ordinary concrete. The ascending section is a polynomial related to the reinforcement ratio and the steel fiber content. The descending section is only related to the steel fiber Negative exponential expression related to dosage.