适用于农田水利建筑物的改良型数字混凝土模型  

The improved random aggregate model of concrete for irrigation and water conservancy

作　　者：覃源[1] 柴军瑞[1,2] 党发宁[1] 

机构地区：[1]西安理工大学水利水电学院,陕西西安710048 [2]三峡大学土木水电学院,湖北宜昌443002

出　　处：《河北农业大学学报》2012年第2期130-135,共6页Journal of Hebei Agricultural University

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)

摘　　要：通过对传统数字混凝土建模方法的研究,提出了改良型数字混凝土建模方法,优化了数字混凝土界面厚度。对新建立的模型进行多工况分析,并将结果与传统模型的数值模拟结果以及试验结果相比较,通过分析得到以下主要结论:①当级配相同时,改变混凝土内部骨料分布会使彼此之间损伤形态产生很大差别,但是损伤单元数量相近;②在超过材料峰值强度之前,混凝土内部骨料位置的变化不会对其力学性能造成显著影响,而在达到失稳阶段时影响较显著;③改良后的模型能够使界面厚度明显降低,计算结果更加贴近试验结果,可以取代传统的数字混凝土模型在工程中的应用。The improved random aggregate model of concrete was established based on the tradi- tional random aggregate model. The thickness of the interfacial transition zone was reduced. The numerical simulation was carried out and the result was compared And the numerical re- suits can be listed as follows： ①The fracture morphology had a big difference from each other, but the quantity of damage element was close when the grading of concrete is same. ②There was no significant influence on the mechanical property of concrete before the value of load ex- ceeds the peak strength, after the value of load exceed the peak strength, this influence become more significant than before. ③The thickness of the interfacial transition zone was reduced a lot in the improved model, and the computational accuracy was increased. It was deduced that the improved model may take place of the traditional model in engineering practice.

关 键 词：混凝土 细观模型 随机骨料模型 三点弯试验 数值模拟 

分 类 号：TU501[建筑科学—建筑技术科学]