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5191.不同压缩加载速度对杉木微观结构和力学性能影响
[建筑业] [2014-04-15]
以典型针叶材树种杉木(Cunninghamia lanceolata)为研究对象,采用微型力学试验装置和自主研发的原位检测系统,在1,10,50 mm/mim加载速度条件下,研究木材连续横纹压缩时的力学行为差异和微观结构的实时变化.结果表明:在不同加载速度条件下,木材出现首次屈服变形的位置不同,这将直接导致木材力学行为产生差异;原位检测系统可以准确地表征木材微观结构的变化特征,从而可以很好地解释不同加载速度下木材产生力学行为差异的原因.
关键词：原位检测；微观构造；加载速度；力学性能；弹性应变能
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5192.3d钢房材料的层次分析
[黑色金属冶炼和压延加工业,建筑业] [2014-03-28]
This paper proposed a hierarchical architecture of steel house materials. The proposed architecture will include the detailed information of the components. For this, we made description about steel house design method and material change task ontology. Especially AFM is composited with total four steps. Using the method, the solution process of possible problems occurred in a steel house can be converted to an otology. Also we made category about composite patterns of steel house materials.
关键词：钢铁；钢房；材料；3D；AFM
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5193.单肋式箱形截面钢弓弦拱桥面内和面外的不稳定耦合分析
[建筑业,黑色金属冶炼和压延加工业] [2014-03-25]
Steel single rib box section arch bridge is established on the basis of secondary development using parametric language of large-scale finite element software ANSYS.On the premise of same sectional area A of arch rib,height breadth ratio h/b is changed,and both the spatial instability mode under the condition of arch bridge's dead weight and the stability safety coefficient under the condition of the first step instability mode is calculated.With the aim to optimize distribution of stiffness and stability of single rib arch bridge,the target is to find out a height breadth ratio h/b which can make in-plane and out-plane instability mode coupling,that is to say,equivalent stiffness of in-plane and out-plane of the mode.
关键词：钢箱单肋拱桥；不稳定模式；安全系数；ANSYS；抗弯刚度
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5194.结构2012，交通研究记录：第2313号美国交通研究会报告
[铁路、船舶、航空航天和其他运输设备制造业,建筑业] [2014-03-21]
The report discusses 21 papers on topics including general structures; steel bridges; concrete bridges; field testing and nondestructive evaluation of transportation structures; tunnels and underground structures; culverts and hydraulic structures; structural fiber-reinforced polymers; and critical transportation infrastructure protection.
关键词：钢铁；桥梁；结构分析；性能评估；无损检测；钢筋混凝土
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5195.钢管混凝土结构的经济分析
[黑色金属冶炼和压延加工业,非金属矿物制品业,建筑业] [2014-03-21]
The concrete-filled steel tube structure possesses the advantages stemming from both steel and concrete. When the structure receives pressure, the concrete in the steel tube bears the stresses from three directions owing to the restriction of the steel tube.The combination of both materials can help conquer their respective weakness and bring their strong points into full play.play.Therefore the concrete-filled steel tube structure has a bright future. Whether a structure system has a bright future largely depends on the economic benefit of the system. This paper presents an economic analysis on concrete-filled steel tube structure by way of comparing the reinforced concrete structure.
关键词：钢铁；钢管混凝土结构；钢筋混凝土结构；经济效益
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5196.铁路桥梁护栏腐蚀的检测和量化的可行性研究
[铁路、船舶、航空航天和其他运输设备制造业,黑色金属冶炼和压延加工业,建筑业] [2014-03-21]
The Center for Nondestructive Evaluation at Iowa State University has experience in development of measurement techniques and new sensors using a variety of interrogating energies. This research evaluated feasibility of three technologies—x-ray radiation, groundpenetrating radar (GPR), and magnetic flux leakage (MFL)—for detection and quantification of corrosion of embedded reinforcing steel.The methods provide useful and complementary information. GPR provides a rapid approach to identify reinforcing steel that has anomalous responses. MFL provides similar detection responses but could be optimized to provide more quantitative correlation to actual condition. Full implementation could use either GPR or MFL methods to identify areas of concern, followed by radiography to give a visual image of the actual condition, providing the final guidance for maintenance actions.
关键词：钢铁；桥面板；缓蚀剂；钢筋混凝土；无损测验；路面罩面；桥梁护栏
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5197.恶化的桥下部结构修复的步骤、成本和效力
[建筑业] [2014-03-21]
Deterioration of bridge substructures has been a serious concern throughout Wisconsin. Concrete, steel and timber components all require distinct repair methods which not only address the true cause of the deterioration, but also protect the component from future damage. In order to determine common repair practices and their success rates, the research team surveyed maintenance engineers throughout the United States to determine successful and reliable substructure repair techniques.
关键词：钢铁；高速公路桥；桥下部结构；成本效率；维护
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5198.结构2012，交通研究记录：第2268号美国交通研究会报告
[建筑业,铁路、船舶、航空航天和其他运输设备制造业] [2014-03-21]
This document consists of 14 papers that explore construction road user costs in rural areas, value of tablet computers in transportation construction inspection, benefits of three- and four-dimensional computer-aided design models, comparison of public-private partnerships and traditional procurement methods, construction manager-general contractor delivered projects, and volumetric and mechanistic test variability on predicted performance of asphalt pavement.
关键词：钢铁；高速公路桥；沥青混凝土路面；项目管理；农村地区；热拌沥青混凝土
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5199.正交异性钢桥面桥梁的设计、建造和维护指南
[建筑业,黑色金属冶炼和压延加工业] [2014-03-20]
This Manual covers the relevant issues related to orthotropic steel deck bridge engineering, including analysis, design, detailing, fabrication, testing, inspection, evaluation, and repair.
关键词：钢铁；高速公路桥；桥面；测试；分析；设计；检验；评估
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5200.铝桥面板的发展和配置
[黑色金属冶炼和压延加工业,金属制品业,建筑业] [2014-03-20]
This report contains the analysis and retrofit of a steel truss bridge on KY 974 over Howard Creek in Clark County, Kentucky. The bridge had major corrosion and damage to the steel stringers, along with cracking and leaching occurring in the concrete bridge deck.
关键词：钢铁；铝桥面板；裂化；腐蚀；配置
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