泡粒混凝土的力学性能与本构关系

Mechanical Property and Constitutive Relation of Foamed Particles Concrete

考虑聚苯颗粒体积比及湿密度等级两个影响因素,配制了共计25组不同配比的泡粒混凝土.研究了加载速率对泡粒混凝土应力-应变曲线的影响情况,结果表明其应变率效应不明显;并研究了不同聚苯颗粒含量以及不同湿密度等级对泡粒混凝土的应力-应变曲线的影响情况,结果表明此材料的密度以及聚苯颗粒含量对其力学性能影响均很大,并表现出不同的规律性.通过对其弹性模量、压溃应力、压溃应变等参数的分析,结合试验结果,建立了该材料的单轴压缩唯象本构模型,通过试验结果与预测结果的比较,唯象本构模型与试验结果吻合较好.

Considering two factors of the polystyrene particle content and wet density, 25 groups of foamed particles concrete with different proportions were prepared. The strain rate effect is not obvious by studying the loading speed on stress-strain curve of foamed particles concrete. The effect of different polystyrene particles content and different wet density on stress-strain curve of foamed particles concrete was also studied. The results show that the influence of polystyrene particles content and wet density on mechanical properties was obvious. Through the analysis of modulus of elasticity, crushing stress, crushing strain and other parameters, combining with test results, a phenomenological uniaxial compressive constitutive model of foamed particles concrete is established. Comparing test results with modeling predictions, good agreements are obtained between the phenomenological constitutive model and test results.