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文章通过运用大型通用有限元软件ANSYS建立桥梁有限元模型,对刚构拱桥在大型运输车荷载作用下的受力特点进行分析,提出针对性的加固方案,并采用有限元模型分析了加固方案的可行性。 相似文献
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针对水泵支架质量稍重,不利于节能环保的问题,首先利用三维软件Pro/E建立符合有限元分析的三维模型,然后导入有限元分析软件Workbench,进行结构分析和模态分析,得到分析结果;根据分析结果有针对性的对水泵支架进行轻量化改进,然后再导入有限元分析软件Workbench进行结构分析和模态分析,验证轻量化改进的结果;经过对比分析结果,轻量化改进前后性能基本没变化,但重量下降了20%,从而验证了轻量化改进的效果。结果证明:改变传统类比的方法,借助限元分析有针对性的轻量化改进是可行的。 相似文献
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文章在对拟建南宁外环公路大冲邕江特大桥的自然条件、水文、地质、航道等因素进行分析研究的基础上,对原方案大桥主塔承台进行优化设计,并采用有限元软件建立全桥和局部有限元模型进行结构计算分析及验算,确定优化方案的合理性及可行性,为类似工程设计提供参考。 相似文献
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以独塔空间索自锚式悬索桥为工程背景,运用大型有限元分析软件midas/civil建立有限元模型,对独塔空间索自锚式悬索桥的动力特性、抗震性能和减隔震等方面进行了探讨研究。 相似文献
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本文根据某连续梁桥的病害情况、受力特点,采用有限元软件midas/civil对结构进行有限元建模计算分析。通过对该连续梁桥的体外预应力加固施工全过程进行施工监控,分析比较施工中体外索的伸长量、箱梁控制截面的应力、桥梁挠度等的理论值和实测值,得出有价值的结论,用于指导工程实践。 相似文献
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Pedestrians as compared to vehicular traffic enjoy a high degree freedom of movement even in heavily congested areas. Consequently, there are more alternative links available to pedestrians between a given origin‐destination (O‐D) pair. This paper describes a study done by the University of Calgary to evaluate the factors affecting the choice of route on intra‐CBD trips or trips within the Central Business District (CBD). An origin destination survey conducted in downtown Calgary, Alberta enabled the identification of the most significant factors influencing the choice. These factors were analyzed in relation to the physical characteristics of the location, personal characteristics of the trip maker and the type of the trip. It appears that most people chose the shortest link and factors such as the level of congestion, safety or visual attractions were only secondary. This suggests that the length should be made a major consideration when planning and designing pedestrian links. 相似文献
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本文阐述了混合动力列车的技术特点及其相应优势与劣势,同时介绍了其在国内外的研究动向,并对其应用前景进行了展望。尽管该类新型铁道车辆的续航能力、电池寿命以及成本等相关问题目前仍有待改善,但以其对城市环境的美化作用与优越的舒适驾乘性能,以及高效节能、绿色环保的显著优势,依然不失为一类充满前景的新型轨道交通运输方式。 相似文献
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明确埋地管道防腐保温层的技术评价标准,对埋地钢质管道的安全运行,延长管道使用寿命具有重要意义。为了对埋地管道防腐保温层做出有效评价,从间接检测与开挖检测2个方面,结合现场检测数据,提出了基于防腐保温层的电流衰减率、绝缘电阻率、质量状况与厚度的分级评价标准及基于4种评价指标的综合评判方法。工程实践表明,该评价标准对防腐保温层是否存在失效能做出有效判断。 相似文献
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In India pedestrians usually cross the road at mid-block crosswalks due to ease of access to their destination or the development of adjacent land use types such as shopping, business areas, school and residential areas. The behaviour of pedestrian will change with respect to different land use type and this change in behaviour of pedestrian further reflects change in perceived level of service (LOS). So, it is important to evaluate the quality of service of such crossing facilities with respect to different land-use type under mixed traffic conditions. In this framework, pedestrian perceived LOS were collected with respect to different land-use type such as shopping, residential and business areas. The ordered probit (OP) model was developed by using NLOGIT software package, with number of vehicles encountered, road crossing difficulty as well as safety considered as primary factors along with pedestrian individual factors (gender and age), land-use type and roadway geometry. From the model results, it has been concluded that perceived safety, crossing difficulty, land-use condition, number of vehicles encountered, median width and number of lanes have significant effect on pedestrian perceived LOS at unprotected (un-signalized) mid-block crosswalks in mixed traffic scenario. The inferences of these results highlights the importance of land use planning in designing a new set of pedestrian access facilities for unprotected mid-block crosswalks under mixed traffic conditions. Also the study results would be useful for evaluating pedestrian accessibility taking into account different land-use type and planning required degree of segregation with vehicular movement at unprotected mid-block crosswalk locations. 相似文献
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This paper estimates the efficiencies and productivity changes of 12 international airports in the Asia-Pacific region based on data from 1998 to 2006. We apply stochastic frontier analysis (SFA) to compute efficiency estimates and use the Malmquist productivity index (MPI) to analyze productivity changes. We use the SFA model with a translog-type production function after testing the statistical hypotheses. According to the results of the SFA hypothesis tests, airports have experienced a technological regression; the deviations from the efficiency frontier are caused more by technical inefficiency than random noise. However, the inefficiency was found to decrease. The MPI reveals a declining trend resulting more from technological change than from efficiency change, with a decrease in inefficiency. Taken together, both the hypothesis tests and the MPI not only provide consistent conclusions, but also suggest that airports should concentrate on technological progress. 相似文献