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Influence of longitudinal slope on the mechanical response of steel deck pavement

Journal of Southeast University(English Edition) 2018年第1期34卷 71-77页

作者： Chen Xiaobing　 Xu Libin Luo Ruilin Liu Han School of Transportation Southeast UniversityNanjing 210096China

In order to study the influence of longitudinal slope on the mechanical response of steel deck pavement,a method of slope-modulus transformation was proposed for the mechanical analysis of the steel deck pavement based on the time-temperature equivalence *** the mechanical action on a slope,a finite element model of the deck pavement was established to determine the critical load position of tensileand shear stress of the steel deck ***,the influence of longitudinal slope on the mechanical response of the deck pavement under the conditions of uniform speed and emergency braking was *** results indicate that the maximum transverse tensile stress at the pavement surface and the maximum transverse shear stress at the pavement bottom are always greater than their longitudinal counterparts under uniform *** emergency braking,however,the critical slope gradient of t e maximum transverse and longitudinal tensile stress at t e pavement surface is 6%.The maximum longitudinal shear stess at t e pavement bottom is always greater ta n t e maximum tansverse shear *** stidy is helpful in t e strctural design of large longitudinal slope steel deck pavements.

关键词： longitudinal slope steel deck pavement stress critical load position time-temperature equivalence finite element method

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Field investigation on effects of railway track geometric parameters on rail wear

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第11期7卷 1846-1855页

作者： SADEGHI J. AKBARI B. School of Railway Engineering Iran University of Science and Technology Narmak Tehran Iran

Rail wear has dramatic impact on track performance, ride quality and maintenance costs. The amount of rail wear is influenced by various elements among which geometric parameters play an important role. The amount of wear in Iran’s railway lines and its imposed maintenance costs oblige us to make modifications on the various geometrical parameters. In order to ensure the effectiveness of these changes, it is necessary to investigate these parameters and their effects on the wear. This research is aimed at studying the effects of different track geometrical parameters on the vertical and lateral wear by conducting a three phase field investigation. The first phase was carried out at the switches of a station, the second phase at a straight line, and the third at a curved line out of the station. The results obtained are analyzed and the role of each track geometrical parameter in the rail wear is discussed. Recommendations for prevention or reduction of rail wear are presented.

关键词： Rail wear Vertical and lateral wear Superelevation Gauge longitudinal slope Track geometry

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Analysis of Driving Psychological Load in V-Shaped Subsea Tunnels Considering Driver Skin Electrical Signals

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Journal of Shanghai Jiaotong university(Science) 2022年第4期27卷 579-587页

作者： PAN Fuquan PAN Haitao ZHANG Lixia LU Linjun YANG Xiaoxia WANG Lin School of Mechanical and Automotive Engineering Qingdao University of TechnologyQingdaoShandong266520China School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China

To examine the variation law of the driving psychological load in subsea tunnels under different illumination and longitudinal slope conditions,22 drivers were recruited to participate in a real vehicle test in off peak hours under similar traffic conditions,and the skin electric signals of the drivers in the free flow state were *** the skin conductance level(SCL)as the load characteristic index,the influence of the different illuminance and slope conditions on the drivers’skin electrical signals was analyzed,and a measurement model of the relationship between the uphill and downhill slopes,illuminance and driver’s SCL value was *** results indicate that the illuminance change rate and driver’s SCL are positively correlated.A larger illuminance change rate leads to an increase in the SCL and psychological workload of the *** influence of the uphill and downhill slopes on the driver’s SCL value in different areas of the subsea tunnel is considerably *** the increase in the degree of the uphill and downhill slopes,the driver’s SCL value increases,and the maximum SCL appears in a slope range of 3.5%–4%.Moreover,the SCL of the drivers in the downhill section is higher than that in the uphill section,corresponding to a larger driving psychological load.

关键词： subsea tunnel skin electrical signal driving psychological load illuminance longitudinal slope

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