Influence of Aggregate Distribution on the Effective Elastic Modulus of Concrete Based on XFEM

被引：0
|
作者：
Zhang D. [1 ]
Zhang X. [2 ]
Mo J. [1 ]
Wang Q. [3 ,4 ]
机构：
[1] Inst. of Systems Eng., China Academy of Eng. Physics, Mianyang
[2] Sichuan Univ., Jinjiang College, Pengshan
[3] College of Architecture and Environment, Sichuan Univ., Chengdu
[4] Chengdu Univ., Chengdu
来源：
Gongcheng Kexue Yu Jishu/Advanced Engineering Sciences | 2019年 / 51卷 / 03期
关键词：
Concrete; Effective elastic modulus; Extended finite element method; Interfacial transition zone;
D O I：
10.15961/j.jsuese.201800447
中图分类号：
学科分类号：
摘要：
Elastic modulus of concrete plays an important role in civil engineering design, thus it is important to keep the accuracy of its computation. Based on the on-hand three-layered spherical-shell model, an equivalent inclusion that consists of the aggregate, the interfacial transition zone and cement mortar was made, and its elastic modulus was calculated by the three-layered spherical-shell model. Then, the concrete was seen as a two-phase composite, which consists of the equivalent inclusion and basic cement mortar. Under the fixed-grid background, the extended finite element method without augmented degree of freedom was used to calculate the effective modulus of two-dimensional two-phase concrete composed of equivalent inclusions and cement mortar. This kind of XFEM can avoid the problem of dimensional inconsistency after aggregate distribution being changed. And the aggregate degradation was obtained through giving different aggregate diameters. It was shown that the aggregate degradation has no influence on the effective modulus of concrete, and the analytical solutions for predicting the effective modulus of concrete are only reliable when aggregate content is low, and the effective modulus of concrete has a linear relationship with aggregate content. © 2019, Editorial Department of Advanced Engineering Sciences. All right reserved.
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页码：108 / 113
页数：5
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