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基于损伤力学理论和应变等价原理,将冻融循环下轴心受压(砖)砌体损伤等效为砌体冻融损伤和轴心受压损伤的非线性耦合,推导了砌体冻融损伤和轴心受压损伤演化方程,获得了冻融循环下轴心受压砌体损伤演化方程,建立了冻融循环下轴心受压砌体损伤本构关系模型.利用冻融循环后砌体轴心受压试验数据验证所建立模型的合理性.结果表明:所建立的冻融循环下轴心受压砌体损伤本构关系模型能很好地拟合冻融循环后砌体轴心受压试验数据.该模型可为寒冷地区在役砌体结构有限元模拟及耐久性评估提供理论基础.
Based on the theory of damage mechanics and strain equivalence, the axial compression (brick) masonry damage under the freeze-thaw cycle is equivalent to the nonlinear coupling of the freeze-thaw damage and the axial compression damage. Damage and axial compression damage evolution equations were obtained, and the damage evolution equations of axial compression masonry under the freeze-thaw cycle were obtained, and the constitutive model of axial compression masonry damage under freezing-thawing cycles was established. Body axial compression test data to verify the rationality of the model established.The results show that under the established freeze-thaw cycle, the constitutive model of axial compression masonry damage can well fit the axis of the masonry after the freeze-thaw cycle Compression test data.The model can provide theoretical basis for finite element simulation and durability evaluation of the masonry structures in service in cold area.