基础下减震垫的减振性能

IF 2.2 4区 工程技术 Q2 ENGINEERING, CIVIL Structural Engineering and Mechanics Pub Date : 2021-01-01 DOI:10.12989/SEM.2021.78.4.425
J. Sadeghi, E. Haghighi, M. Esmaeili
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引用次数: 7

摘要

在基础下使用减震垫在目前的实践中,以减少/阻尼建筑物通过周围环境接收的振动。虽然对基础下减震垫的性能进行了一些研究,但对其在降低铁路诱发振动方面的有效性还没有进行充分的研究,特别是在考虑下土介质的情况下。在这方面,本研究旨在研究在考虑土-结构相互作用的情况下,用于降低铁路诱发振动的建筑物基础下的减震垫的性能。为此,建立了建筑物及其周围土体的二维有限元模型。它包括弹性土介质、铁路路堤、减震垫和建筑物。模型结果用文献中报道的解析解进行了验证。通过对土壤类型、冲击垫层模量和主激励频率的广泛参数分析,检验了冲击垫的性能。结果表明,减震垫虽然能有效地降低建筑物的振动,但其性能受其下部土体介质的影响较大。土壤越软,减震垫的效率越低。此外,随着列车激励频率的增加,减震垫的性能也有所提高。利用所获得的结果,开发了一种简化的模型/方法来预测减震垫在减少铁路引起的振动方面的有效性。
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Performance of under foundation shock mat in reduction of railway-induced vibrations
Under foundation shock mats have been used in the current practice in order to reduce/damp vibrations received by buildings through the surrounding environment. Although some investigations have been made on under foundation shock mats performance, their effectiveness in the reduction of railway induced-vibrations has not been fully studied, particularly with the consideration of underneath soil media. In this regard, this research is aimed at investigating performance of shock mat used beneath building foundation for reduction of railway induced-vibrations, taking into account soil-structure interaction. For this purpose, a 2D finite/infinite element model of a building and its surrounding soil media was developed. It includes an elastic soil media, a railway embankment, a shock mat, and the building. The model results were validated using an analytical solution reported in the literature. The performance of shock mats was examined by an extensive parametric analysis on the soil type, bedding modulus of shock mat and dominant excitation frequency. The results obtained indicated that although the shock mat can substantially reduce the building vibrations, its performance is significantly influenced by its underneath soil media. The softer the soil, the lower the shock mat efficiency. Also, as the train excitation frequency increases, a better performance of shock-mats is observed. A simplified model/method was developed for prediction of shock mat effectiveness in reduction of railway-induced vibrations, making use of the results obtained.
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来源期刊
Structural Engineering and Mechanics
Structural Engineering and Mechanics 工程技术-工程:机械
CiteScore
3.80
自引率
18.20%
发文量
0
审稿时长
11 months
期刊介绍: The STRUCTURAL ENGINEERING AND MECHANICS, An International Journal, aims at: providing a major publication channel for structural engineering, wider distribution at more affordable subscription rates; faster reviewing and publication for manuscripts submitted; and a broad scope for wider participation. The main subject of the Journal is structural engineering concerned with aspects of mechanics. Areas covered by the Journal include: - Structural Mechanics - Design of Civil, Building and Mechanical Structures - Structural Optimization and Controls - Structural Safety and Reliability - New Structural Materials and Applications - Effects of Wind, Earthquake and Wave Loadings on Structures - Fluid-Structure and Soil-Structure Interactions - AI Application and Expert Systems in Structural Engineering. Submission of papers from practicing engineers is particularly encouraged.
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