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采用复合试件试验对不同的桥面铺装结构进行性能评价,推荐合理的双层SMA桥面铺装典型结构,为桥面铺装结构选择提供参考。 相似文献
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钢纤维混凝土在京福路K30+924通道桥桥面铺装抢修工程中的应用表明:钢纤维混凝土可以发挥良好的抗拉、抗弯、抗裂等性能,可改善桥面铺装的使用性能,延长桥面铺装使用寿命,缩短施工工期,是重交通量路段桥面铺装局部抢修最佳方案之一。 相似文献
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环氧沥青钢桥面铺装技术 总被引:1,自引:0,他引:1
通过对钢桥面铺装的特点、技术要求的分析,从环氧沥青钢桥面铺装结构、混合料性能、配合比设计、施工质量控制等几个方面,对环氧沥青钢桥面铺装技术进行了介绍,提出了环氧沥青钢桥面铺装质量的控制要点. 相似文献
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本文通过对复合桥面混凝土铺装过程中容易出现的平整度问题进行分析,找出影响复合桥面混凝土铺装平整度的主要因素,采取切实有效措施,提高复合桥面混凝土铺装平整度。 相似文献
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文章结合广西玉林至铁山港铁高速公路白沙头港跨海大桥工程实例,分析了沿海盐湿热环境对沥青混合料桥面铺装耐久性的影响因素,从沥青混合料桥面铺装的材料要求、桥面铺装层结构优化和施工工艺控制等方面,探讨提高沥青混合料桥面铺装耐久性的技术措施。 相似文献
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文章针对钢桥面铺装体系受力复杂、铺装表面承受较大的弯拉应力、钢桥面铺装使用的荷载与温度条件相对恶劣等情况,对钢桥面沥青铺装表面的拉应力进行了粘弹性有限元计算分析,介绍采用粘弹性材料模型,利用试验数据计算得到的材料计算参数,为铺装设计提供参考。 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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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
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介绍了城市轨道交通工程中杂散电流不同的监测系统的构成,分析了集中式、分散式和智能型等监测系统的配置和功能,以及智能型实时在线监测系统的重要意义,为轨道交通工程杂散电流监测系统的选择与应用提供参考。 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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天然气自动计量系统有多种组态软件,由于软件的不相通性,造成了计量系统数据采集的通用性差、数据传输与入库的时效性差、数据利用的可靠性低.结合各组态软件的实际情况,从设计上充分利用Oracle大数据处理能力以及Partition(分区表)的特性,实现历史数据的存储,应用WebService与COM+数据访问组件提供多层数据访问架构,采用OPC与DDE工业数据交换协议,实现了各站场计量数据的实时上传,为连续数据采集和实时监控提供了可能,节约了改造成本. 相似文献
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Joseph N. Prashker 《Transportation》1979,8(4):329-346
Reliability of travel modes was found to be the most important characteristic of transportation systems in several attitudinal investigations of individual travel behavior. This paper represents the first part of a research effort aimed at gaining a better understanding of the characteristics of reliability of transportation modes in urban travel. In this research, reliability characteristics are identified; their importance relative to each other is assessed, and an insight into possible structure of an objective reliability index is discussed. The research is based on perceived values of reliability, which were identified through a large attitudinal survey conducted in the Chicago metropolitan area. 相似文献