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Numerical simulation of vibrational response characteristics of railway subgrades with insulation boards

Research in Cold and Arid Regions 2022年第1期14卷 23-31页

作者： ZiYu Wang XianZhang Ling YingYing Zhao Feng Zhang LiHui Tian School of Marine Science and Technology Hainan Tropical Ocean UniversitySanyaHainan 572022China School of Civil Engineering Harbin Institute of TechnologyHarbinHeilongjiang 150090China School of Civil Engineering Southeast UniversityNanjingJiangsu 211189China School of Mining Engineering Heilongjiang University of Science and TechnologyHarbinHeilongjiang 150022China

This study presents a numerical method based on the surface temperature data and the ground temperature increase in Daqing for predicting temperature field distribution in the Binzhou Railway subgrade and analyzing the temporal and spatial distribution of freeze−thaw status of railway *** calibrated numerical method is applied to simulate the temperature field distribution and roadbed vibrational response of the railway subgrade with a thermal insulation layer at different *** results show the following:(1)The thermal insulation layer can remarkably increase the soil temperature below it and maximum frost depth in the subgrade.(2)Thermal insulation can effectively reduce the subgrade vibration and protect it from frost damage.(3)Given that the strength requirements are met,the insulation layer should be buried as shallow as possible to effectively reduce the subgrade vibration *** research findings provide theoretical support for the frost damage prevention of railway subgrades in seasonally frozen regions.

关键词： seasonally frozen regions railway subgrade insulation layer vibrational response frost depth

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Impact Noise of Non-homogeneous Floors： Analysis of Different Input Parameters for Computational Modeling Predictions

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Journal of Civil Engineering and Architecture 2017年第3期11卷 274-281页

作者： Maria Fernanda de Oliveira Jorge Vicoso Patricio2 Technological Institute onCivil Construction - itt Performance Unisinos University Sao Leopoldo 93022-750 Brazil National Laboratory for Civil Engineering-LNEC Lisbon1700-066 Portugal

Floor systems with non-homogeneous slabs have more complex means of propagation than homogeneous systems, with more variables to be considered in predictions by theoretical models. For those slabs, it is necessary to understand the differences of each material composing each subsystem, and the connection types between the elements of each one of this subsystem. Some floors integrating lightweight elements without structural purposes, are broadly used in several countries in precast slabs. The predictions based on computer modelling for building systems can be influenced by the input parameters related to connections between the elements of the floor system. In building structures, the analysis of radiation due to element vibrations may be represented by wave propagation relationships as a one-dimensional system, a two-dimensional system or a three-dimensional solid. In these floors, the modelling of the interaction between elements can be basically a face, a line or a point connection. In addition, the choice of the connection type can determine the vibration transmission amongst all the floor elements. This study focuses on the differences that can be obtained in the induced vibration response due to an impact source on non-homogeneous slabs. It also presents some examples of modelling options for several floor systems, considering input parameters for different connection types.

关键词： Non-homogeneous floors vibrational response finite element analysis.

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