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This paper presents an experimental study on the performance of a shear-sliding stud-type damper composed of multiple friction units with high-tension bolts and disc springs. A numerical evaluation of the response reduction effects achieved by the stud-type damper is also presented. In dynamic loading tests, the behavior of stud-type multiunit friction damper specimens was investigated. Three different full-scale damper specimens, which were composed of five, six, or seven friction units with two or four sliding surfaces, were incorporated into loading devices for testing. The stud-type friction dampers demonstrated stable rigid-plastic hysteresis loops without any remarkable decrease in the sliding force even when subjected to repetitive loading, in addition to showing no unstable behavior such as lateral buckling. The damper produced a total sliding force approximately proportional to the number of sliding surfaces and friction units. The total sliding force of the stud-type damper can thus be estimated by summing the contributions of each friction unit. In an earthquake response simulation, the control effects achieved by stud-type dampers incorporated into an analytical high-rise building model under various input waves, including long-period, long-duration and pulse-like ground motions, were evaluated. A satisfactory response reduction was obtained by installing the developed stud-type dampers into the main frame without negatively impacting usability and convenience in terms of building planning.  相似文献   
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设计暴雨是缺乏流量数据的中小流域推求设计洪水的基础,对水利工程设施、市政工程设计等建设标准具有重大影响,国内外对此展开了大量研究。近年来由于气候和环境变化的影响,洪水频发且流量极大,山洪和城市内涝灾害对山区人民和城市居民的财产及人身安全构成了威胁,引起了多起严重事故,因此对设计暴雨雨型提出了更高的要求。论文系统总结了典型暴雨雨型选择的原则与方法和雨型分类方法,梳理了相关方面的国内外雨型推求方法及其特点,包括芝加哥雨型法、Huff雨型法、三角形雨型法、Pilgrim & Cordery雨型法等4种短历时设计暴雨雨型,以及长历时的SCS雨型与同频率分析法;最后提出了中小流域设计暴雨雨型存在的问题并对未来研究方向进行展望。  相似文献   
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一种大范围干旱的识别方法及其应用   总被引:1,自引:0,他引:1       下载免费PDF全文
基于日本APHRO格点降水数据计算格点SPI序列,兼顾时空连续性,定义了一种大范围长历时干旱的识别方法。该方法以我国国土面积的10%作为大范围干旱事件影响范围的最小阈值,同时给定了干旱事件影响区域的空间连续和时间连续的判定标准,另辅以干旱烈度计算方法和干旱中心的识别方法,给出了此类干旱事件的面积、历时、烈度及干旱中心的指数定义和事件的识别过程。在此基础上,识别了我国1961—2015年以来的69次大范围干旱事件,得出这69次大范围干旱事件的平均面积指数为30.49%,平均干旱历时为8.15个月,平均干旱烈度为-4.192。利用此方法对1998—2002年发生在华北地区的持续性区域干旱事件进行再分析。结果表明,这一时期的干旱事件不仅局限于华北地区,同时也波及到东北、西北、西南和东南等地,涉及了4次大范围长历时的干旱过程。  相似文献   
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