Ebook Foundations of civil and environmental engineering 12 pdf

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In the paper several specified models of ballast longitudinal resistance to behaviour of CWR track have been analysed. The considered problem is connected with local track segments in which horizontal displacements of rail cross-sections occur. The displacements occur mainly because of real non-uniform temperature distributions over the length of CWR track (e.g. variable insolation of rail, variable temperature of rails to sleepers fastening) [11, 12, 16]. On the grounds of empirical characteristics, the obtained formulae and dependences allowed an analysis of displacement distribution along the track and also an examination of forces and stress distribution. Similar phenomenon also occurs within the so-called ‘breathing’ ends of CWR track [5,9]. A significant influence of railway works (e.g. railway tamping) on a range of local temperature changes interaction along the track has been shown [1, 2].