现浇大跨径箱梁满堂支架的计算分析

总结了太子河景观路独塔斜拉桥主梁预应力混凝土箱梁满堂支架的施工计算分析,就如何保证满堂支架施工工艺安全和质量控制要点进行阐述。     

沥青封层对水泥路面振动性能的影响

考虑在水泥路面上增设几种不同厚度的乳化沥青上封层,采用有限元分析软件ANSYS计算分析沥青上封层对受动荷载作用的水泥路面振动性能的影响。计算结果表明:在水泥路面上加铺薄层沥青上封层可以有效降低车辆行驶对水泥路面的感应刚度,从而对抑制振动冲击荷载作用效应在路表的扩散有明显效果;总体上看,薄层沥青上封层对改善水泥路面在振动冲击荷载作用下的变形及受力有一定作用,但不明显;随着封层厚度的增加,面层底部正应力和剪应力值都有所降低,厚度变化初期降幅小,后期降幅增大。     

道路养护中封层与病害整治技术的综合运用

针对养护、预养护中存在的问题,提出了综合养护的概念,即在修复原有道路病害的基础上实施封层罩面。针对单层稀浆封层易出现的问题,提出了双封层的概念。双封层处治方案既恢复了路表功能,同时又抑制了老路潜在病害的反射。采用了综合养护方案的路面比直接实施封层罩面方案的路面更加耐久。     

路面级配碎石基层设计方法探讨

级配碎石广泛应用于低等级路面基层和高等级路面的防反射裂缝结构层,级配碎石层的设计对使用性能有重要的影响。从级配碎石的材料选择、级配选择、级配设计进行了探讨,并对其应力应变特性和永久变形进行了定性分析。     

沥青路面层间粘结材料施工质量控制技术

针对目前广东省高等级公路路面透层、下封层和粘层施工质量控制和管理得薄弱环节,结合各项目成功的施工经验,提出沥青路面透层、下封层和粘层原材料、施工工艺、质量检测以及施工管理等关键环节的控制要点,可供同行参考借鉴。     

汽车密封性连接器中密封圈的设计方法

对汽车密封性连接器的防水密封性能进行分析,提出在连接器防水性能中起关键作用的密封圈的设计方法,以及密封圈在装入连接器后的壁厚变形量的计算公式。     

自卸汽车用新型结构液压缸

介绍了一种适用于重型自卸汽车的新型液压缸结构及其特点,指出该液压缸与老式结构液压缸相比之下的加工工艺改进,新结构油缸比原结构油缸减少了内泄漏量,仅为原结构油缸内泄量的1/30。     

机械限位开关有效监控的方法

起重设备的一些重要的机械限位开关的安全可靠性要求很高 ,通过PLC编程和编码器的应用 ,可对其进行有效监控 ,一旦发生位置变化或失效 ,便及时报警和停车 ,以确保设备安全。     

Test of extensively damaged hybrid ship hull

A hybrid ship hull model made with a steel truss and composite sandwich panels was tested and analyzed with the goal of gaining insight into how well this structural concept holds up after major damage. One of the ideas of the concept was to mount the sandwich panels to the steel truss such that they can be blown out in a controlled fashion to ventilate a large internal blast. The hull should be designed to have sufficient strength for the ship to reach a port safely even after such extensive damage. A 6-m model of such a hybrid ship hull, consisting of a stainless steel truss and 60 composite sandwich panels, was manufactured and mechanically tested. A number of panels were then removed one by one and the hull was retested to the design load after each panel had been removed. The removed panels simulated major damage. After nine panels had been removed, from all the different areas of the hull, it could still carry the design load, although with considerable nonreversible deformations of the hull girder. The hull was eventually loaded to final failure, which occurred at 25% above the design load.     

论我国船用柴油机机加工工艺技术水平现状与发展策略

通过对目前国内外船用柴油机机加工工艺技术水平现状的调研和分析，提出了发展我国船淫柴油机加工工艺技术的基本思路，探讨了“九五”期间的重点任务和关键技术。