公路环境保护监理的工作要点探讨

基于环境保护的重要性,阐述了公路工程环境保护监理在施工准备阶段、施工阶段、缺陷责任期阶段监理工作的要点,以及采取的主要措施.     

综合交通信息平台 建设运营机制研究

在分析国内外已建交通信息系统和信息平台建设、运营和服务情况的基础上,研究了信息的平台性质与功能定位、建设运营模式和保障机制。提出了3种适合我国现状的信息平台建设运营模式:政府行为型;政府建设、企业运营型;政府引导、企业运作型。研究了各类模式的特点和适用性。     

梁拱组合体系关键部位应力分析

结合某拱梁组合体系桥的建设,采用有限元程序建立该桥关键部位结构分析空间有限元模型,模拟该部位在各种荷载工况下的受力情况,得出该部位的应力状态,揭示了常规分析中不能发现的一些问题。     

后张法预应力在桥梁工程中的应用

结合工程实例介绍了后张法预应力在桥梁施工中的应用，主要包括孔道设置、穿柬、张拉、压浆等关键工序的施工和质量控制．以及千斤顶活塞伸长值的理论计算方法．提出确保桥梁结构物满足规范要求的具体措施。     

重庆菜园坝长江大桥结构细节设计

重庆菜园坝长江大桥主桥设计首创组合式刚构-系杆拱拱式桥梁结构体系,设计上采用了“钢”与“混凝土”的材料组合,同时又采用预应力混凝土刚构与钢箱系杆拱的结构组合。要使这一组合式拱桥结构体系安全、经济、美观,结构的细节设计尤为重要,它是确保该桥体系成立的关键,又是确保大桥安全营运的基础。对该桥的边墩接头、系杆锚固键、钢混凝土接头及前次横梁等部分结构的细节设计做简要介绍。     

苏通大桥特大型钢吊箱整体吊装的关键技术

苏通大桥主桥6、7、8号墩的特大型钢吊箱采用整体吊装施工工艺。基于施工实践,重点介绍吊箱整体吊装的关键技术。     

高速公路危险点控制管理研究

针对高速公路交通安全管理的特征和需要，引入危险点控制管理的思想，比较详细地阐述了危险点控制管理的概念，性质，特点和原则，探讨了危险点评价，确定，分级和系统综合分析的方法，并在此基础上，就危险点控制管理机制建设提出了一定的设想和建议。     

Inventory,Classification, and Analysis of Special Management Areas Associated with U.S. Coastal Programs

Area-based management approaches may be beneficial in integrating sectoral, single-purpose laws and regulations; however, these benefits may not be attained if special area designations are equally sectoral or single-purpose in nature. Over 60 types of special management areas were documented under U.S. coastal programs, and a new classification scheme was developed to allow comparisons and analyses across programs. Results indicate that requirements and incentives for special area designations under the Coastal Zone Management Act did little to standardize or influence area-based management systems associated with state and territory coastal programs. Further, the absence of clear patterns within and between coastal programs with respect to special area policies suggests a limited commitment to this important aspect of coastal management. Continued research is needed to document the effectiveness of the various area-based management approaches presented in this article.     

Technical Note: Force Control in Electrohydraulic Active Suspensions Revisited

The inner loop control for the actuator force can be quite simply compensated by means of a correction term to the desired force signal at the input. The correction requires only a measurement of the actuator piston velocity and is employed to cancel the loop disturbance caused by the oil flow to the actuator. Although an additional time constant is introduced by the integration in the inner loop force control, the overall performance is nevertheless quite close to that of an ideal optimal system.