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中文摘要：
针对普通混凝土受冻融循环损伤作用后,其力学行为不仅依赖于混凝土基体的行为,而且与冻融循环次数有关的特性,以冻融循环作用后混凝土试件在双轴压加载条件下的应力-应变关系曲线为研究对象,考虑到混凝土主压向应变会受到次压向有效应力影响的特点,建立了基于损伤力学理论和热力学原理,并考虑了双轴压应力比影响的普通混凝土双轴压损伤本构模型,与冻融循环作用后普通混凝土在双轴压加载条件下测得的应力-应变关系的试验曲线进行了对比分析.研究结果表明：所建立的普通混凝土双轴压损伤本构模型,可以较好地描述冻融循环作用后普通混凝土在双轴压加载条件下的本构关系.
英文摘要：
The mechanical performance of plain concrete depends on not only the plain concrete body,but also the behavior suffered from the damage of freeze-thaw cycles.The biaxial compression stressstrain curves of concrete after freeze-thaw cycles were taken as research objects,and the characteristics of strain of ε3in the direction of main pressure affected by effective stress of 珚σ2were considered.The brittle elastic damage constitutive model of plain concrete specimens under biaxial compression after freeze-thaw cycles was established based on thermodynamics mechanics and damage mechanics.The computed results according to brittle elastic damage constitutive model were compared with the experimental results.The results show that the proposed model can well describe the stress-strain curves of plain concrete under biaxial compression after freeze-thaw cycles.
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