冻融循环下轴心受压砖砌体损伤本构关系模型

Damage Constitute Model of Brick Masonry under Freeze Thaw Cycles and Axial Compression

关键词:  冻融循环  砌体  轴心受压试验  损伤本构关系模型  损伤力学  应变等价原理

Key words:  freeze thaw cycle  masonry  axial compression experiment  damage constitutive model  damage mechanics  strain equivalence principle

摘要:

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.

Abstract:

Based on damage mechanics and strain equivalence principle, the damage of （brick） masonry under freeze thaw cycles and axial compression was discussed in terms of the nonlinear coupling of freeze thaw damage and axial compression damage. Then the evolution equations for two damages were deduced. The evolution equation for the damage of masonry under freeze thaw cycles and axial compression was deduced. Furthermore, the damage constitute model of masonry under freeze thaw cycles and axial compression was put forward, which was verified by the axial compression experimental data of masonry under freeze thaw cycles. It is indicated that the damage constitutive model of masonry under freeze thaw cycles and axial compression is in good agreement with axial compression experimental data of masonry under freeze thaw cycles, which can be beneficial for the finite element simulation and durability assessment for existing masonry structure in the cold region.