三塔悬索桥中塔弹性纵向约束对结构设计的影响

以泰州大桥为例,用有限元法分析了三塔悬索桥中塔弹性纵向约束的合理弹性刚度,研究了弹性纵向约束对主塔、加劲梁、主缆以及结构动力特性的影响,研究结果表明,设置弹性索能有效改善三塔悬索桥的受力性能。     

采用加强型贝雷梁基础的桥梁支架施工工艺

在公路、市政桥梁建设中,桥梁施工支架系统采用钢管立柱门洞、贝雷梁架门洞及型钢门洞等形式作为跨越通行道路或河道的方法,各地的操作工艺已经非常成熟,但是大跨径的门洞搭设为数不多,也未见理论性指导和操作规程的归属。本文以某高架桥的施工作为工程实例来阐述贝雷梁在桥梁支架系统中的应用。     

成都盆地西缘第四纪砾石层成因及其工程特性研究

成都盆地西南缘大面积分布第四纪沉积物,整体上岩性主要为一套黄灰色、灰黄色砂砾层、粘土层。根据多条铁路的野外考察和部分试验结果,对砾石层进行成因及风化特征研究,并对其工程地质性质作出初步评价。根据历史成因分为四个主要类型:大邑砾石层（Q1）、名邛砾石层（Q21）、丹思砾石层（Q22）、雅安砾石层（Q31）。区内砾石层普遍存在风化作用,它对工程性质的影响较为明显。     

关于17-4PH沉淀硬化不锈钢综合性能的研究

为提高汽车中轴的使用性能（抗耐磨、高硬度和较好的冲击韧性）,对17—4PH不锈钢进行试验研究,通过合理控制化学成分及调整热处理工艺,对该钢进行热处理工艺制度的优化试验,并对热处理后的材料进行力学性能、显微组织以及X射线分析试验。分析试验数据,观察材料的微观组织,研究热处理工艺对材料组织和耐磨性能的影响,摸索出在1050℃固熔＋520℃时效处理后。硬度与耐磨性最高,冲击韧性较好,满足了性能要求。     

港珠澳大桥对伶仃航道和铜鼓航道回淤影响研究

通过伶仃洋河口潮流泥沙物理模型试验,研究了港珠澳大桥建设对伶仃航道和铜鼓航道的回淤影响。研究结果表明:在假设水文泥沙条件下,港珠澳大桥建设后,伶仃航道内淤积厚度及淤积量呈减少态势;铜鼓航道内淤积厚度及淤积量略有增加。     

江苏某地互层状土的岩土工程特性

互层状土是具有某种特殊性质的土层.基于江苏某地互层状土的室内土工试验成果,结合现场原位测试的相关数据,全面阐述互层状土在物理、力学、水理等岩土工程特性,针对互层状土的室内土工试验方法和试验成果的选择提出相关建议,可供类似土层的工程勘察、室内土工试验参考.     

基于多步优化策略的地声参数反演方法与研究

传统的地声参数多步优化反演方法大多选用同一代价函数对不同频段进行反演。文章提出一种新的地声参数反演多步优化策略,针对不同参数选择不同类型的代价函数和信号频段,并应用于某海试实验数据处理,验证了其有效性。     

高速有碴轨道弹性轨枕的应用

介绍今后将成为高速有碴轨道改革重大技术动向的弹性轨枕的应用情况 ,尤其是日本的弹性轨枕 ,着重介绍该轨枕的断面形状、防振橡胶层及其耐久性试验、道床横向阻力试验与试铺效果。     

Formation of Denmark Strait overflow water and its hydro-chemical composition

The dense overflow across the Denmark Strait is investigated with hydrographic and hydro-chemical data and the water mass composition of the Denmark Strait Overflow Water (DSOW) is determined by multivariate analysis. Hydrographical properties, the transient tracers CFC-11 and CFC-12, oxygen and nutrients are utilized for the water mass definitions. Distribution and characteristics of water masses north of Denmark Strait are described, the important water masses at the sill and the variability on weekly time-scales are discussed, and the entrainment and mixing of water into the overflow plume in the northern Irminger Basin is calculated. The analysis indicates that water masses both from the Nordic Seas and the Arctic Ocean are important for the formation of DSOW. It is found that water masses transported with the East Greenland Current make up about 75% of the overflow at the sill. The overflow at, and shortly south of, the sill is inhomogeneous with a low-salinity component dominated by Polar Intermediate Water. The high-salinity component of the overflow is mainly of Arctic origin. The water mass composition, and the short-term variability for 7 repeats of sections close to the sill are described, and these illustrate that the overflow is in fact a composite of a number of water masses with different formation and transport histories. This indicate that the overflow is a robust feature, but that it responds to variations in the circulation or atmospheric forcing that influences the formation of intermediate and deep water masses within the Arctic Mediterranean and the North Atlantic. At a section about 400 km south of the sill the overflow is well mixed and modified by entrainment of, mainly, Iceland–Scotland Overflow Water and Labrador Sea Water, together constituting 30% of the overflow plume. The entrainment of Middle Irminger Water dominates shortly downstream of the sill, before the overflow plume reaches too deep but the entrainment seems to be intermittent in time.     

易腐物品物流配送中心选址的遗传算法

在分析流物配送中心的作用及其现存选址方法的基础上，建立了一种求解易腐物品配选址问题的算法，虎算法为和ＡＬＡ法相结合而成的遗传算法。