弹性基础上纳米二氧化硅混凝土梁的静力性能研究

IF 2.9 4区 工程技术 Q2 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Computers and Concrete Pub Date : 2021-06-01 DOI:10.12989/CAC.2021.27.6.575
Zouaoui R. Harrat, S. Amziane, B. Krour, M. B. Bouiadjra
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引用次数: 3

摘要

本文研究了二氧化硅纳米颗粒浸渍混凝土梁的静力性能。纳米二氧化硅由于其粒径小,可以影响混凝土的微观结构,提高混凝土的性能。采用Voigt模型考虑团聚效应,得到等效的纳米复合材料性能。此外,采用高阶剪切变形理论对钢筋混凝土梁进行了数学模拟,具有简单、准确的优点。采用含剪切层和温克勒弹簧的帕斯捷尔纳克弹性地基模拟土体介质。利用虚功原理推导了平衡方程,利用哈密顿原理得到了能量方程。同时,采用解析方法得到了简支梁的闭型解。给出了考虑SiO2纳米颗粒体积百分比、机械载荷、几何参数和土壤介质等不同参数对梁静态性能影响的数值结果。这项工作的大多数发现表明,在混凝土中使用SiO2纳米颗粒增加了它们的机械阻力,并且挠度和应力减少。此外,弹性基础对混凝土梁的弯曲有显著的影响。
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On the static behavior of nano Si02 based concrete beamsresting on an elastic foundation
The present study investigates the static behavior of concrete beams impregnated with silicon dioxide (SiO2) nanoparticles. Nanosilica, by virtue of its small particle size, can affect the microstructure of concretes and enhance their properties. Voigt's model is used to take account of the agglomeration effect and obtain the equivalent nano-composite properties. Furthermore, the reinforced concrete beam is simulated mathematically with higher-order shear deformation theory because of its simplicity and accuracy. The soil medium is simulated with Pasternak elastic foundation, including a shear layer, and Winkler spring. The equilibrium equations are derived using the principle of virtual work, and using Hamilton's principle, the energy equations are obtained. Also, analytical methods are employed to obtain the closed-form solutions of simply supported beams. Numerical results are presented, considering the effect of different parameters such as the volume percent of SiO2 nanoparticles, mechanical loads, geometrical parameters, and soil medium, on the static behavior of the beam. The majority of findings from this work indicate that the use of SiO2 nanoparticles in concretes increases their mechanical resistance, and that the deflections and stresses decrease. In addition, the elastic foundation has a significant impact on the bending of concrete beams.
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来源期刊
Computers and Concrete
Computers and Concrete 工程技术-材料科学:表征与测试
CiteScore
8.60
自引率
7.30%
发文量
0
审稿时长
13.5 months
期刊介绍: Computers and Concrete is An International Journal that focuses on the computer applications in be considered suitable for publication in the journal. The journal covers the topics related to computational mechanics of concrete and modeling of concrete structures including plasticity fracture mechanics creep thermo-mechanics dynamic effects reliability and safety concepts automated design procedures stochastic mechanics performance under extreme conditions.
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