多边形骨料混凝土弹性模量预测的数值方法

发布时间：2018-05-04 06:55

本文选题：混凝土 + 弹性模量　；参考：《浙江工业大学学报》2017年04期

【摘要】：混凝土在建筑、水利、海洋和道路工程中应用广泛,其弹性模量是结构变形计算的关键参数.将混凝土细观结构模拟与快速傅里叶变换相结合,提出了混凝土弹性模量预测的数值方法.考虑周期性边界条件给出了多边形骨料和界面在水泥石基体中的随机分布模拟方法.利用快速傅里叶变换方法给出了三相混凝土在外荷载作用下的平均应力、平均应变和弹性模量.将数值方法与文献中的试验数据进行比较,结果表明:当骨料面积百分数分别为40%,60%时,它们之间的相对误差小于5%,初步验证了该数值方法的有效性.基于数值结果,量化了界面弹性模量和厚度对混凝土弹性模量的影响,发现提高界面弹性模量或减小界面厚度都可以有效提高混凝土弹性模量.
[Abstract]:Concrete is widely used in construction, water conservancy, ocean and road engineering, and its elastic modulus is the key parameter of structural deformation calculation. A numerical method for predicting the elastic modulus of concrete is presented by combining the simulation of concrete mesoscopic structure with the fast Fourier transform (FFT). Considering the periodic boundary condition, a method for simulating the random distribution of polygonal aggregate and interface in cement base is presented. The average stress, average strain and elastic modulus of three-phase concrete under external load are obtained by using the fast Fourier transform method. The numerical method is compared with the experimental data in the literature. The results show that when the percentage of aggregate area is 40 and 60, the relative error between them is less than 5. The validity of the numerical method is preliminarily verified. Based on the numerical results, the effects of interface elastic modulus and thickness on concrete elastic modulus are quantified. It is found that increasing interface elastic modulus or decreasing interface thickness can effectively increase concrete elastic modulus.
【作者单位】：浙江工业大学建筑工程学院;浙江省工程结构与防灾减灾技术研究重点实验室;
【基金】：国家自然科学基金资助项目(51379188) 浙江省自然科学基金资助项目(LY15E090006) 浙江省科技计划项目(2016C33106)
【分类号】：TU528

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