【摘要】 开展微粒混凝土不同加载应变率和不同初始静态荷载下力学性能和抗压强度尺寸效应试验研究。试验结果表明:微粒混凝土的动态抗压强度和弹性模量随着加载应变率的增加而提高,不同应变率下微粒混凝土峰值应力处的应变基本相同,应力-应变曲线相似,破坏形式相同;微粒混凝土的动态抗压强度随着初始静载比例的提高而降低,但破坏形式相同。振动台模型试验中微粒混凝土可以较好地模拟原型普通混凝土。在试验的基础上,进一步建立考虑应变率和初始静载影响的微粒混凝土抗压强度和弹性模量计算方法,提出微粒混凝土不同应变率下本构关系实用计算模型和抗压强度尺寸效应计算公式,建立振动台模型试验微粒混凝土强度控制准则。研究成果可用于振动台模型试验微粒混凝土相似关系设计和结果分析。更多还原

【Abstract】 The mechanical property and size effect of microconcrete under compression are investigated through experiments,implemented under different strain rate loadings and distinctive initial static loadings.The observations illustrate that the dynamic compressive strength and elastic modulus of the microconcrete increase with the strain rate.Under different strain rate,the microconcrete strain values at peak stress are close,and the constitutive model and failure type are also quite similar.The dynamic compressive strength of the microconcrete decreasinges with increase of the initial static load,and the failure types are identical.The microconcrete in the experiment is for simulation of general concrete in shaking table test.Based on the experiments,the computation of compressive strength and elastic modulus of the microconcrete is further formulated,considering the influence of the stain rate and initial static load.The constitutive model and size effect are also studied.The law for the compressive strength of microconcrete is presented.更多还原