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《中国建筑防水材料》2011,(10):44-46
金属屋面系统抗风揭实验室授权仪式在苏州举行2011年4月20日下午,苏州防水研究院美国FM认可金属屋面系统抗风揭实验室授权仪式在苏州举行,美国FM认证有限公司认证部总经理Paris Stavrianidis向苏州防水研究院院长兼检测中心主任羡永彪颁发了授权证书,中国建筑防水协会理事长朱冬青等领导,以及来自全国各地的钢结构公司、建筑公司的嘉宾共同见证了授权仪式,并参观了金属屋面系统抗风揭实验室。 相似文献
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在台风地区,超大型金属屋面系统的设计应以抗风揭设计为核心,同时将金属屋面的外观肌理、防水性能、热工性能、屋面采光天窗等多重问题予以综合解决。海口美兰机场T2航站楼设计中,比选了主屋面构造与板型,系统设计了抗风揭试验,全面考虑了各部位防水设计,由此形成了金属屋面系统完善的设计流程。 相似文献
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山西太原潇河国际会展中心中间组团金属屋面工程为复杂双曲结构,采用直立锁边镀铝锌PVDF钢屋面防水板+TPO防水卷材双道防水设计思路,在实现金属屋面系统防水等功能的同时,也保证了屋面双曲造型的完美呈现。本文重点介绍了该项目的屋面系统构造设计、屋面板选型、屋面排水深化设计、抗风揭等性能试验结果,阐述了提高金属屋面系统可靠性的各种设计措施。 相似文献
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近年频发大跨度金属屋面风灾事故,使得此类结构的风灾问题备受关注。造成风灾的原因有很多,主要包括屋面风荷载被低估,未考虑脉动风所引起的屋面疲劳效应,风敏感性气动外形引起的高负压和必要控制措施的缺失,屋面抗风设计及施工缺陷等。从屋盖风荷载分布、金属屋面抗风承载力、风致疲劳性能和抗风设计方法4个方面总结和评述了国内外的研究进展。根据已有研究存在的问题、风灾调查以及2017年超强台风“天鸽”作用下金属屋面工程实例,建议进一步开展对大跨度屋面风压分布特征、金属屋面抗风承载力与风致疲劳性能的理论和数值分析方法以及提高屋面抗风性能的构造措施和空气动力学措施等方面的系统研究。 相似文献
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鉴于金属屋面由于抗风能力设计不足,风揭事故频发的情况,为保证金属屋面系统的抗风揭性能满足使用需求,本文通过介绍厦门新会展中心—会议中心金属屋面系统抗风揭试验,分析验证金属屋面系统构造稳定性,提出增加抗风夹具和U型件、减小面板宽度、在垂直屋面板方向采用不锈钢压条连接抗风夹具的加固措施,并经过第二次抗风揭试验验证其可靠性,得出采用的加固措施可以有效提高屋面的抗风揭能力的结论,顺利通过了全国最大的抗风揭试验。 相似文献
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以杭绍台铁路站房金属屋面为研究对象,通过抗风揭试验,明确其失效模式和抗风揭承载力,并探讨不同参数对直立锁边金属屋面抗风揭性能的影响。研究结果表明:直立锁边金属屋面在风吸力作用下主要的破坏模式是锁边处屋面板与支座的脱扣破坏;改变支座高度、檩条间距、布置抗风夹均能提高直立锁边金属屋面的抗风揭性能,其中布置抗风夹效果最为显著;高强抗风夹能转变金属屋面系统的失效模式,较常规抗风夹而言,能大幅提高屋面板抗风承载力;动态循环加载对直立锁边金属屋面的极限承载力存在着明显的影响,在实际工程中进行动态循环抗风揭试验是十分有必要的。 相似文献
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Screw fastened light gauge steel profiled roofing sheets are predominantly subjected to wind suction, i.e., wind uplift, and may fail locally in the vicinity of screw fasteners under strong or sustained fluctuating wind uplift. A series of static tests was performed on three types of profiled roofing sheets to investigate their structural behaviour and profile effects under simulated wind uplift. The considered sheeting profiles were arc-tangent, trapezoidal and ribbed, and an alternate (or equivalent alternate) sheeting crest fastening system was adopted. It was found that structural behaviour of the roofing sheets under uplift loads was greatly dependent on the sheeting profiles including the shape and height of the crest. Both arc-tangent and trapezoidal type roofing sheets exhibited a large cross-sectional distortion stage and a deflection hardening stage, following a local plastic collapse in the vicinity of the screw fasteners at the central support. The ribbed roofing sheet, however, had a final failure mode of sudden fracture with cracks under the screw fastener head at the central support. The use of cyclone washers with screw fasteners reduced local plastic deformations and, in general, increased initial failure loads of the roofing sheets. Increasing the roofing span only slightly reduced the limit values of the reaction force per fastener at the central support due to the local failure characteristic of the screw fastened profiled roofing sheets. 相似文献
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Wind effects on roofing systems are dynamic, because of wind's fluctuation in time and space. Therefore a dynamic means of evaluating roofing systems is beneficial for identifying the component in a roofing system that has the weakest resistance against wind uplift forces. The Special Interest Group for Dynamic Evaluation of Roofing Systems (SIGDERS) commissioned a unique North American roofing facility, which has been used to evaluate a mechanically fastened modified bituminous membrane roof system under three different test methods: the Factory Mutual FM-4470 static test standard, the UEAtc (European Union of Agreement) procedure, and the SIGDERS-developed dynamic load cycle. Comparison of the results of these tests shows that UEAtc and SIGDERS tests produce failure modes similar to those observed in the field. The SIGDERS load cycle was completed in much less time than the UEAtc procedure. 相似文献
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Roof wind design consist of three parts: determination of wind loads, evaluation of wind uplift resistance and correlating the resistance with the design load such that the resistance is higher than the load requirement. Wind uplift resistance of a system with its respective components is evaluated in laboratory testing. This paper presents a novel approach to estimate wind uplift resistance when components are substituted during field application. Wind dynamics, on a mechanically attached single-ply roofing assembly, lift the membrane and cause fluttering, introducing stresses at the attachment locations. In such assemblies, the fastener–deck interface is a critical design factor. First, by taking steel deck as a component this paper systematically characterizes the various steel decks that are commonly used in low slope application. Second component, namely the fasteners and its engagement strength with deck have been quantified for variations of its design, size and sources. Based on this component characterization, fastener pullout resistance (FPR) is identified as a verification factor for system wind resistance estimation. When variations occur in the fastener–deck interface between the proposed and the existing configurations, the present research through case studies has proved that: “as long as the FPR of the proposed configuration is higher than the existing configuration then wind uplift ratings can be maintained”. This is valid as long as both the configurations have all the remaining roofing components similar with comparable layout. Based on this verification, the study recommends that the testing lab should report the FPR along with the wind uplift resistance such that FPR can be used as a verification factor to accept design/field alternatives. 相似文献
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某国际机场航站楼屋面板抗风承载能力试验研究 总被引:1,自引:0,他引:1
金属屋面板自20世纪80年代开始引进我国,至今已得到了巨大的发展和广泛的应用,尤其是在大型公共场馆领域,但是,沿海地区或风力较大地区的大型场馆金属屋面经常因受到风荷载的影响而被破坏。对某沿海国际机场航站楼屋面加固工程所采用的65/333型镀铝锌面板的抗风承载能力进行了试验研究,分析了该类型屋面板在风吸力作用下的破坏机理和在屋面板T码上施加锁夹对屋面板抗风压承载力的影响。根据试验结果,对机场屋面采取了经济合理的加固措施,以提高屋面系统抗风荷载承载能力。屋面板的试验不仅为机场屋面加固工程提供科学依据,而且为类似大型场馆金属屋面的加固提供有价值的参考资料。 相似文献
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在美国FM实验室和中国苏州实验室分别进行了EPDM、PVC、TPO三种单层卷材屋面系统和直立锁缝、暗扣板、复合平板三种金属屋面系统的抗风揭平行对比试验,结果显示中美两个实验室间的测试结果具有很好的相关性;文中同时就测试结果与计算值之间的关系以及中美两国相关建筑规范中风速、风压的换算关系等问题进行了说明。 相似文献