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变换施加于钢筋砼平板试件水平及垂直方向拉力与压力的比值以及钢筋的配置方向,使平板内产生不同的应力状态、用于研究砼强度的软化性能。研究表明:在二向拉压力作用下,钢筋砼平板中的砼不仅主应力方向的抗压强度降低,而且抗拉强度也降低,即存在砼强度软化现象。同一砼和配筋率情况下,砼强度的降低程度与配筋角度及施加于试件两向的拉压应力比有关,而与加載路径无关。通过分析,提出了砼抗压和抗拉的强度软化计算公式。
The ratio of the tension and pressure in the horizontal and vertical directions and the orientation of the reinforcing bars applied to the steel plate specimens are changed, so that different stress states are generated in the plates and used to study the softening properties of the strength of the crucible. The study shows that under the action of the two-direction tensile stress, the crucible in the reinforced concrete plate not only has reduced compressive strength in the direction of the principal stress, but also has reduced tensile strength, ie, there is a phenomenon of strength softening of the crucible. In the case of the same concrete and reinforcement ratio, the reduction in the strength of the crucible is related to the ratio of the reinforcement angle and the ratio of the tensile and compressive stresses applied to the specimen in both directions, irrespective of the loading path. Through the analysis, the calculation formulas for the strength softening of concrete and compressive strength are proposed.