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在修正压力场理论(MCFT)基础上,结合现行混凝土结构设计规范中钢筋混凝土深受弯构件受剪承载力公式,提出了混杂纤维钢筋混凝土深梁抗剪承载力简化计算模型.模型引入纤维对钢筋混凝土深梁受剪承载力的贡献,并考虑了纵筋配筋率的相对影响.采用该模型对试验梁进行预测,将试验值与该模型计算值以及现行纤维混凝土结构技术规程中钢纤维混凝土深梁抗剪公式的计算值进行比较.结果表明,该模型可以综合反映混凝土强度、纤维种类和形状、纤维体积率、长径比和配筋率等诸多影响因素,计算结果与试验值吻合较好,并且适用范围广,适用于纤维钢筋混凝土有腹筋和无腹筋深梁的抗剪承载力计算.
Based on the revised theory of pressure field (MCFT), a simplified calculation model of shear strength of hybrid reinforced concrete deep beam is put forward based on the formulas of shear capacity of RC members with deep flexural strength under current design code of concrete structure. The contribution of longitudinal shear reinforcement to the shear capacity of reinforced concrete beams and the relative influence of reinforcement ratio of longitudinal reinforcement are taken into account.The model is used to predict the test beam.The experimental values and the calculated values of the model and the technical parameters of the existing steel fiber reinforced concrete structure The results show that the model can comprehensively reflect concrete strength, fiber type and shape, fiber volume fraction, aspect ratio and reinforcement ratio and so on. The calculation results are consistent with the experimental values Which is suitable for the calculation of the shear strength of reinforced concrete with web and without web reinforcement.