考虑海水冻融和侵蚀耦合作用的混凝土Ottosen强度准则

Ottosen Strength Criterion of Concrete by Sea Water Freeze-thaw and Erosion Coupling Action

为了有效评估海水冻融和侵蚀耦合作用后混凝土的力学性能,通过试验研究了海水冻融和侵蚀耦合作用下混凝土的力学性能退化规律,并基于连续损伤力学和经典破坏准则模型,建立了考虑混凝土干湿循环次数和海水冻融循环次数的Ottosen四参数强度准则,以及不同的冻融循环次数和海水干湿循环作用后混凝土的弹性模量和泊松比退化模型。分析结果表明:随着冻融循环次数和干湿循环次数的增加,混凝土轴心抗压强度、弹性模量逐渐下降,Ottosen强度准则的拉、压子午线纵坐标绝对值减小,混凝土的抗裂性能降低。

In order to effectively assess mechanical property of concrete after sea water freeze-thaw and erosion coupling action by test,authors studied mechanical property degeneration rule of concrete after sea water freeze-thaw and erosion coupling action by test.Based on continuum damage mechanics and the classical failure criteria model,four-parameters Ottosen strength criterion with wet-dry cycle number and sea water freeze-thaw cycle number after erosion was deduced.Degeneration model of concrete elastic modulus and Poisson ratio was presented.Analysis results show that with the increase of the numbers of wet and dry cycles and freeze-thaw cycles,concrete axial compressive strength,modulus of elasticity and other mechanical properties of concrete decline gradually.The absolute value of axis of ordinates of meridian line declines and anti-crack property of concrete reduces.