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早龄期混凝土的本构关系是施工期混凝土结构非线性分析和计算的基础,由于其理论研究的严重滞后,造成了早龄期混凝土结构分析时先进算法和粗略模型的不匹配,也找不到可以依据的本构关系。借鉴弹塑性本构理论,根据早龄期C20混凝土材料的破坏包络面、初始屈服包络面以及参照面对八面体应力空间的划分状况,依据被划分区域和两个强度包络面及参照面在应力空间中的相对位置关系,分别给出了各划分区域的本构模型,得到了早龄期C20混凝土材料一般形式的弹塑性本构关系,从而为早龄期C20混凝土结构或构件在双轴受力状态下的非线性分析提供了理论依据。
The constitutive relationship of early age concrete is the basis of nonlinear analysis and calculation of concrete structure during construction period. Due to the serious lag of its theoretical research, the mismatch between advanced algorithm and rough model in early age concrete structure is caused To the constitutive relationship can be based on. According to elasto-plastic constitutive theory, according to the damage envelope, initial yield envelope and reference surface of octahedral stress space of early age C20 concrete material, according to the divided area and two intensity envelopes and reference Surface structure in the stress space, the constitutive model of each divided area is given respectively, and the general form of elasto-plastic constitutive relation of C20 concrete material in the early age is obtained. Nonlinear analysis under biaxial stress provides the theoretical basis.