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J. J. Kalker has been the first to consider non-steady-state or transient contact mechanics. Based on Kalker the second author developed a linear contact model for the non-steady-state rolling contact of a wheel running over slightly corrugated rails. The theoretical investigations are concentrated on linear, non-steady-state contact mechanics superimposed to a nonlinear reference state. The reference state is given by the running behaviour of a wheelset due to traction, curving or hunting. For the linear, non-steady-state analysis Kalker's theory has to be modified to predict wear rates in dependency of the corrugation wavelengths. As a result corrugations are only amplified in the range between 2 and 10 cm. Therefore, non-steady-state contact mechanics and wear are responsible for a wavelength fixing mechanism. Structural mechanics of the rail indicate that wavelength in this range is predominantly amplified. 相似文献
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薄祥照 《国防交通工程与技术》2006,4(3):58-60
针对支座安装过程中使用环氧树脂砂浆具有对环境污染大、清除困难等缺点,介绍了杭州湾跨海大桥50m箱梁支座安装过程中采用高强无收缩灌浆新材料替换环氧树脂砂浆的措施和技术,取得较好的应用效果和经济效益,可供同类工程借鉴。 相似文献
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自行式移动模架法现浇40.6 m简支箱梁施工技术 总被引:1,自引:0,他引:1
天兴洲长江大桥34孔40.6m简支箱梁采用两套挪威生产的自行式移动模架进行桥位制梁,介绍了模架系统的结构组成和工作原理,重点介绍了模架安装、模架预压、支座安装和箱梁施工等关键技术,对同类工程有借鉴意义。 相似文献
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傅耕野 《减速顶与调速技术》2008,(4):10-16
影响减速顶临界速度的因素很多,有外部因素和内部因素,本文主要是研究和分析影响减速顶临界速度的外部因素,而且重点分析和计算车轮直径、车轮与减速顶接触点高度对减速顶临界速度产生的影响。 相似文献