The possible designation of the Mediterranean Sea as a SECA: A case study

In view of the ongoing discussions concerning the possible designation of the Mediterranean Sea as a Sulphur Emission Control Area (SECA), a modal split model was applied to a case involving the transportation of consolidated cargoes between Thessaloniki, Greece and industrial hubs of northern Germany. A road-only option was assessed against a combined-transport route involving a ferry (Greece–Italy) and a truck-on-train (Italy–Austria) service. The logit model used considers two variables as determinants of the modal selection: transport cost and time. The data are derived from interviews with a small transport service provider, typical for Greece, and are based on actual trips made (revealed preferences). The results predict that the designation of the Mediterranean as a SECA will cause a modal shift in favour of the road-only route by 5.2%, which under certain assumptions can reach 17.1%. However, the environmental implications of the resulting modal choices, calculated through the EcoTransIT World web based tool, are positive in relation to all emissions examined. This is attributed to the longer distance of the combined-transport option in comparison to the road-only one and, the poor environmental performance of the Ro-Pax vessels basically due to the need to maintain a relatively high speed.     

CFG桩帽混凝土完全湿揭法的施工与检测效果

由反射波法检测CFG桩(桩帽)完整性,一些桩的反射波曲线为正弦波衰减、周期大、无桩底反射信号,经分析和验证,原因是施工桩时,造成了桩浅部垂向裂纹、水平断裂、桩帽与桩没有连结成一体。为确保CFG桩(桩帽)质量完整,采用CFG桩帽混凝土完全湿揭法施工,效果良好。     

全幅双柱大挑臂预应力盖梁施工支架的搭设与受力验算

介绍山岭重丘区高速公路的部分桥梁因受地形限制,下部结构采用全幅双柱大挑臂预应力盖梁施工时,支架的搭设与受力验算的施工经验和建议。     

桥梁预应力盖梁的设计与应用

结合忻保高速公路的设计经验,对某处桥梁预应力盖梁的设计及其应用情况进行了较详细的介绍。     

螺旋桨毂帽鳍节能装置的数值评估与试验研究

对螺旋桨毂帽鳍装置的节能效果采用粘流CFD数值模拟与模型试验的方法进行了评估.利用CFD数值工具对毂帽鳍的节能机理、螺旋桨与毂帽鳍的相互作用,以及雷诺数对节能效果评估的影响进行了详细研究.研究表明,在将桨毂、毂帽鳍和桨叶看作一个系统来考虑时,才能定量评估出节能效果.毂帽鳍对整个系统总推力影响很小,对总扭矩显著减小,从而效率增加.实型尺度雷诺数下毂帽鳍计算得到的节能效果更高,这间接证实了毂帽鳍实船节能效果可能比模型试验节能效果更显著.     

桥梁大体积混凝土水化热及管冷仿真技术

应用大型有限元软件分析桥梁承台施工中管冷的作用,通过有管冷、无管冷和降低管冷温度模拟大体积混凝土降温的效应.根据湖北十堰地区某大桥承台施工中的真实记录,证明文中的仿真分析是正确的,所得结论对类似工程具有较大的参考价值.     

中堂水道桥外包盖梁加固桥梁基础

中堂水道桥在下部结构加固过程中遇到航道等限制情况,针对工程设计过程中遇到的问题,通过方案比选,采取植筋、砼外包盖梁、增加盖梁预应力、顶升、横向增加桩柱等措施,以分担不同比例上部荷载的技术应用于复杂状态的桥墩加固。通过此项体系转换、主动加固桥墩的新技术,开拓加固新思维。     

具有油气分离功能的摩托车油箱盖

一种集成油气分离器功能的油箱盖，在有效收集汽油蒸气，防止燃油溢流的同时，还能平衡油箱内部气压，保证燃油箱正常供油，确保摩托车运行正常。该油箱盖不仅解决了油气分离效果不佳的问题，而且性能可靠、安装方便和应用成本低。     

海上承台施工技术

以杭州湾跨海大桥Ⅳ合同工程为背景,从承台的钢套箱设计、钢套箱封底、承台钢筋混凝土,以及混凝土养护和温控等方面的施工,介绍海上承台施工的关键技术。     

钟宅湾大桥主桥承台围堰施工方法

厦门钟宅湾大桥主桥为58 m 208 m 58 m三跨中承飞翼式钢箱提篮拱桥,主桥承台采用钢板桩围堰施工。介绍了承台钢板桩围堰施工方法。