燃气用不锈钢波纹管的选择及应用

通过对户内橡胶软管与燃具连接在实际运行中弊端的分析,提出用燃气不锈钢波纹管代替橡胶软管的思路。介绍了不锈铜波纹管的原理、分类、选择、推广应用、存在的不足及发展方向。     

多层不锈钢波纹管热工性能的实验研究

多层不锈钢波纹管是采用特种不锈钢板材，滚压卷成几种规格圆形薄壁光管，将焊缝错开套装成多层薄壁圆形光管，再经特殊工艺胀波凸起成型。对多层波纹管进行了热工性能实验，并给出该管的优化尺寸范围。     

钢制波纹管在漾泉大道的设计与应用

介绍了钢制波纹管在国内外的应用现状及优点,并以漾泉大道工程为例,从计算参数选取、荷载计算、强度验算等方面,阐述了钢制波纹管在道路涵洞应用中的结构计算方法,总结了钢波纹管涵的施工要点,保证了工程的施工质量。     

PVC-U双壁波纹管配方设计与工艺特性的研究

针对PVC-U双壁波纹管的产品结构、性能及模具特点,分析了PVC-U双壁波纹管的配方设计,重点讨论了生产中混合、挤出和机头模具的工艺控制,并从生产实际出发总结了配方设计和工艺控制的技术要点.     

钢波纹管涵与钢筋混凝土涵洞应用研究

结合西纵高速公路钢筋混凝土盖板涵,对比分析了钢波纹管涵的经济适用性及优点,并对测量放线、地基处理、安装管身、接缝填塞等钢波纹管涵施工工艺进行了介绍,指出该工程通过钢波纹管涵的施工,取得了良好的效果。     

不锈钢波纹管换热器在长输加热站的应用及经济分析

针对不锈钢波纹管换热器的结构特点，进行了详细的理论和技术性能分析，阐述波纹管换热器在使用中的优缺点，比较在为原油加热时波纹管换热器与传统加热炉的经济效益和社会效益。     

塑料波纹管的应用

本文对塑料波纹管的性能进行了较全面的分析、对比,说明塑料波纹管不论在技术性能上,还是在经济效益上,均超过各类塑料管材。不仅可全面替代各类塑料管材,而且可部分替代金属管材,是一种较理想的电气配线新型管材。文章还对塑料波纹管在设计中的应用和在施工中应注意的问题进行了讨论。     

预应力钢束用波纹管的应用研究

随着我国大跨度预应力房屋结构、大跨度预应力桥梁和特种预应力结构的发展,后张法大吨位曲线束、空间曲线束、多跨连续束等日益增多,孔道也日益密集,但预应力筋留孔仍沿用钢管抽芯、胶管抽芯和预埋薄钢管等方法,已不能适应要求,迫切需要寻求新的留孔方法。1981年南京金陵饭店宴会厅预应力井式梁板屋盖结构首次采用香港PSC公司镀锌双波纹金属软管(简称波纹竹),并获得成功。1982年～1984年我国承建的伊拉克摩苏尔连续梁桥、广东容奇连续梁桥等也采用了上述波纹管。与此同时,我国上     

HDPE双壁波纹管的性能与应用

高密度聚乙烯(HDPE)双壁波纹管是一种新型管材,具有优良的管道性能。通过在广州人民路排水改造工程中 的实践,表明HDPE双壁波纹管在城市市政建设中有着广阔的推广应用前景。     

HDPE双壁波纹管的性能与应用

介绍了HDPE双壁波纹管的性能特点,从施工工序、综合造价两方面与传统管材进行了分析比较,阐述了HDPE管的工程应用情况及注意事项,实践证明,HDPE双壁波纹管在城市市政建设中的应用前景.     

超声技术在钢桥检测中的应用

结合超声检测技术的发展简史和特点,介绍了超声检测技术在钢桥主梁焊缝检测的应用要点,已建钢桥在安全评定中对超声技术的应用,以及超声衍射技术在钢桥检测中的应用及发展,供钢桥检测的施工人员和研究人员参考。     

超声法检测钢管混凝土缺陷关键技术试验研究

在钢管混凝土缺陷检测领域一般认为,超声法存在超声波短路和结合面脱开后超声波在界面的传播问题这两种不足,这些缺点限制了其在工程中的应用。为此,进行了声速试验和结合面试验两个分项试验研究,结果表明:在目前的探头布设方式下,超声波以横波在钢管中传播,速度约为3 200m/s,存在超声波短路的概率很低;钢材与混凝土结合面脱开后,波形杂乱,采集不到首波信号。这就要求工程质量检测要在混凝土浇筑后尽快进行。     

自密实微膨胀钢管混凝土的配制应用及其超声检测

通过工程实例,介绍了自密实微膨胀钢管混凝土的配制方法、步骤及过程,所设计的混凝土配合比满足工程施工要求的各项性能指标.在工程的应用中,通过超声波检测实体质量,结果表明钢管内混凝土内部严密充实、混凝土与钢管管壁胶结良好.     

超声法检测钢管混凝土缺陷的研究及工程应用

叙述了超声法检测钢管混凝土缺陷的特点、判定方法及工程应用,并且提出了超声法检测钢管混凝土需要注意的一些问题,探讨了在遵循CECS21:2000(超声法检测混凝土缺陷技术规程》的基础上如何更有效地应用超声检测技术,为控制和监测钢管混凝土施工质量提供较为可靠的保障.     

不锈钢管材的应用与市场前景

建筑业是国民经济支柱产业之一，应用新型建筑给水管材又是当今建筑领域的热点问题之一。借鉴国外成熟的应用经验，研制开发综合性能优越的管材和管件，对提高我国现代建筑的档次、改善供水水质、保障人民身体健康和节约水资源具有重要的意义。     

不锈钢强度设计值取值的试验和理论依据

不锈钢具有良好的力学性能,在建筑结构中作为承重构件逐渐被采用,但目前没有不锈钢结构设计规范,影响了不锈钢的使用。本文对3个牌号不锈钢屈服强度的试验数据采用数理统计的方法进行分析,得到屈服强度的概率分布满足正态分布规律。根据《建筑结构设计统一标准》(GB50068—2001)中的规定,得到屈服强度的标准值。再结合可靠度理论得到了3个牌号不锈钢的抗力分项系数,进而得到它们的强度设计值,可供建筑结构设计和制订修改相关规范时参考。     

Experimental and numerical investigation of high strength stainless steel structures

The paper summarises research on high strength stainless steel tubular structures conducted at the University of Hong Kong, and the Hong Kong University of Science and Technology. Square and rectangular hollow sections were investigated. The test specimens were cold-rolled from high strength austenitic and duplex stainless steel sheets. The material properties of the test specimens were determined by tensile coupon tests at normal room and elevated temperatures. The initial geometric imperfection and residual stress of the specimens were measured. The experimental and numerical investigation focused on the design and behaviour of cold-formed high strength stainless steel structural members. The results were compared with design strengths calculated using the American, Australian/New Zealand and European specifications for cold-formed stainless steel structures.     

彩板门窗与不锈钢门窗的发展及应用

１彩板门窗的发展彩板门窗又称彩色涂层钢板门窗 ,在我国是２０世纪８０年代中期最先由山东、北京２个大型门窗厂从意大利赛柯公司 (ＳＥＣＣＯ )引进彩板门窗生产线全套设备生产。９０年代初深圳方大公司、北京依美思建材有限公司等先后引进彩板门窗和彩板幕墙型材生产线 ,到目前为止全国引进线共２０条 ,加上已消化、吸收和国内生产的彩板门窗生产线共有７０多条 ,门窗组装厂约４００家。另外 ,目前我国已有能力生产３２道次液压全自动型材轧机 ,这些都为我国大力发展彩板门窗、彩板幕墙奠定了坚实的基础。１．１彩色涂层钢板彩色涂层钢板…     

Numerical investigation of net section failure in stainless steel bolted connections

Despite fundamental differences in the mechanical behaviour of stainless steel and carbon steel, design provisions for stainless steel connections in current standards essentially follow the rules for carbon steel with some limited modifications. For the case of net section capacity, the design rules from EN 1993-1-3 for cold-formed carbon steel have been adopted for stainless steel connections in EN 1993-1-4 and the SCI/Euro Inox Design Manual without any modification. In this paper, an investigation into the behaviour of stainless steel connections failing by net section rupture has been conducted. Numerical models for austenitic and ferritic stainless steel have been developed and validated against existing test results. The validated models were subsequently used to perform parametric studies to investigate the main parameters affecting the net section rupture of bolted connections; these include edge distance e₂ and bolt configuration. By studying the stress distribution along the net section for different edge distances and bolt arrangements, it was found that the ductility of stainless steel is sufficient to ensure extensive redistribution of stresses prior to fracture. Hence, a revised design equation (based on that given in EN 1993-1-3) for net section capacity of stainless steel connections has been proposed and its reliability demonstrated by means of statistical analysis.     

Development of design rules in the AISC Design Guide for structural stainless steel

This paper describes the development of an AISC (American Institute of Steel Construction) Design Guide for hot rolled and welded structural stainless steel sections. Where stainless steel behaves in a similar way to carbon steel, the Design Guide simply refers to the relevant section in ANSI/AISC 360-10 Specification for Structural Steel Buildings. Where the guidance in the AISC Specification would be unconservative when applied to stainless steel, specific rules for stainless steel were derived and presented in a format as close as possible to the equivalent expressions in AISC 360. The stainless steel design rules were calibrated against an extensive database of test results on members and connections. A full reliability analysis was carried out to calculate the LRFD resistance factors; in most cases, the carbon steel resistance factors were shown to be applicable to stainless steel also.