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介绍了高强混凝土的特点和在实际应用中存在的问题及解决这些问题的方法 ,分析了影响高强混凝土极限压应变的主要因素 ,提出了在综合考虑轴压比和配箍率的情况下计算高强混凝土极限压应变的公式 ;在考虑箍筋的影响后 ,讨论了高强混凝土的本构关系 ,箍筋的影响主要体现在本构关系的下降段上 ,并提出了约束高强混凝土本构关系模型 .从这个模型可以看出 ,高强混凝土的本构关系的下降段与配箍率的关系 ,随着配箍率的增大 ,高强混凝土的延性有很大的提高 .
This paper introduces the characteristics of high-strength concrete, the problems existing in practical application and the methods to solve these problems. The main factors that affect the ultimate compressive strain of high-strength concrete are analyzed. It is put forward that the calculation of high strength under comprehensive consideration of axial compression ratio and stirrup ratio After considering the influence of stirrups, the constitutive relation of high-strength concrete is discussed. The influence of stirrups is mainly reflected in the descending section of the constitutive relation, and the constitutive model of constrainted high-strength concrete is proposed. From this model, it can be seen that the relationship between the descending section of the constitutive relationship of high-strength concrete and the ratio of the tie-in, the ductility of the high-strength concrete has been greatly improved with the increase of the tie-in ratio.