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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Vibration analysis of concrete foundations retrofit with NFRP layer resting on soil medium using sinusoidal shear deformation theory
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Vibration analysis of concrete foundations retrofit with NFRP layer resting on soil medium using sinusoidal shear deformation theory

机译：基于正弦剪切变形理论的土壤介质上装有NFRP层的混凝土地基振动分析

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摘要

After decades of service, concrete foundations may be in need of strengthening and retrofitting due to continuous aging. However, the main objective of this work is presenting a mathematical model for, vibration of concrete foundation with nano fiber reinforced polymer (NFRP) layer resting on soil medium. The nano fibers of NFRP layer are made from carbon nanotubes (CNT) where the effective material properties of nano-composite structure are obtained by Mori-Tanaka model considering agglomeration effects. The soil medium is simulated with spring constants of Winker foundation model. Based on the sinusoidal shear deformation theory (SSDT), energy method and Hamilton's principle, the motion equations are derived. Applying Navier method, the frequency of the structure is calculated analytically so that the effects of volume percent and agglomeration of CNTs, soil medium, structural damping and geometrical parameters of structure are shown on the frequency of system. Results show that considering NFRP layer leads to higher frequency for NFRP thickness to concrete foundation thickness ratio of higher than 0.005.
机译：经过数十年的服务，由于不断老化，混凝土基础可能需要加固和翻新。但是，这项工作的主要目的是提出一个数学模型，用于在土壤介质上放置纳米纤维增强聚合物（NFRP）层的混凝土基础振动。 NFRP层的纳米纤维由碳纳米管（CNT）制成，其中考虑到团聚效应，通过Mori-Tanaka模型获得了纳米复合结构的有效材料性能。用Winker基础模型的弹簧常数模拟土壤介质。基于正弦剪切变形理论（SSDT），能量法和汉密尔顿原理，推导了运动方程。应用Navier方法，对结构的频率进行了解析计算，从而显示了碳纳米管的体积百分数和团聚，土壤介质，结构阻尼和结构几何参数对系统频率的影响。结果表明，考虑NFRP层导致NFRP厚度与混凝土基础厚度之比的较高频率高于0.005。

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