摘要
为了分析水利工程中大体积混凝土材料的非均质性和力学性质多样性的特点,应用随机数学方法建立了多组混凝土随机骨料模型。编写了在ANSYS二次开发基础上的FORTRAN程序。通过此程序对混凝土梁进行了3种工况的数值模拟。结果表明,(a)骨料位置的改变对混凝土材料的静、动强度影响很小。(b)加载类型的不同则能使其强度产生明显的差别,动强度总是高于静强度。(c)对于同一种混凝土模型来说,加载速率的不同会使其动强度大小不同。将所得结论与相关数值模拟和物理试验结果进行对比,发现该分析方法可以较好的模拟出荷载作用下混凝土材料的力学特性,具有较好的实用价值。
To resolve the heterogeneous and changeful mechanical properties of the dam concrete under various loads in practice, the random aggregate model was established through applying a stochastic mathematical method. Based on the secondary development of ANSYS program, the FORTRAN language was compiled. Then the numerical simulation was made for three different working conditions of concrete. The results show： （a） There would be a little influence on static and dynamic strength of concrete by transforming the position of aggregate. （b） With the changing of different kinds of loads, the strength would be changed obviously, and the dynamic strength would be generally higher than the static strength. （c） For the same concrete model, the different loading rate would result in the different dynamic strength. At last, it is found that the method could be used for better simulating the mechanical characteristics of the concrete under loading by comparing with the experimental results, simultaneously, it has the better practical value.
出处
《水利与建筑工程学报》
2013年第1期1-6,共6页
Journal of Water Resources and Architectural Engineering
基金
国家自然科学基金面上项目(50679073)
国家自然科学基金重点项目(90510017)
西安理工大学优秀博士基金(106-211108)
关键词
混凝土
细观损伤
随机骨料模型
三点弯曲试验
数值模拟
concrete
mesoscopic damage
random aggregate model
3-point-bending test
numerical simulation
