围绕某圆形煤场120.8 m跨度球面网壳结构,研究了杆件布置对结构的影响,发现增加斜杆可以明显地增加结构刚度;研究了风荷载和地震作用对网壳的影响,发现基本风压小于0.6 k N/m2或地震烈度小于8度时,二者的变化对网壳耗钢量影响较小;研究...围绕某圆形煤场120.8 m跨度球面网壳结构,研究了杆件布置对结构的影响,发现增加斜杆可以明显地增加结构刚度;研究了风荷载和地震作用对网壳的影响,发现基本风压小于0.6 k N/m2或地震烈度小于8度时,二者的变化对网壳耗钢量影响较小;研究了结构布置、厚度与耗钢量的关系、结构的动力特性和抗震性能、结构的整体稳定性。涵盖了该类型结构设计需要注意的几个主要方面,并提出设计建议。展开更多
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 ...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.展开更多
文摘围绕某圆形煤场120.8 m跨度球面网壳结构,研究了杆件布置对结构的影响,发现增加斜杆可以明显地增加结构刚度;研究了风荷载和地震作用对网壳的影响,发现基本风压小于0.6 k N/m2或地震烈度小于8度时,二者的变化对网壳耗钢量影响较小;研究了结构布置、厚度与耗钢量的关系、结构的动力特性和抗震性能、结构的整体稳定性。涵盖了该类型结构设计需要注意的几个主要方面,并提出设计建议。
文摘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.