System Stabilities and Anti-Fire Redundancy of Steel Frames in Fire

火灾中钢框架的系统稳定性和抗火冗余

• 批准号: 16206055
• 负责人: SUZUKI Hiroyuki
• 金额: $ 31.78万
• 依托单位: University of Tsukuba
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16206055/
• 关键词: structural stability in high temperature; stress redistribution; progressive collapse; ADI-Gauss Method; small collapse test system; post buckling of heated columns; high tension bolt connection; high temperature coupon test; リダンダンシー; structural stability in high temperature; stress redistribution; progressive collapse; ADI-Gauss Method; small collapse test system; post buckling of heated columns; high tension bolt connection; high temperature coupon test; リダンダンシー

Collapse of New York World Trade Center buildings suggests the possibilities that, if locally heated and weakened members lose their strengths, so entire frame in fire may lose their overall stability and fall at worst into progressive collapse.The objectives of this research are to clarify the factors controlling the structural overall stabilities of steel frames, especially of domestic steel frames in fire and to study the means improving the redundancies and therefore anti-progressive collapse performances of heated frames in fire. The following results have been found from the research.(1) Mechanical essentials to control the overall collapse of heated frames in fire have been found specifically.(2) The factors to prevent fames in fire from their overall collapse have been identified and formulated theoretically.(3) Based on the above findings the anti-progressive collapse performances of domestic steel frames in fire have been clearly grasped.(4) The characteristics of the progressive collapse and the causes to accelerate the dynamic failure of tall buildings have been clarified by means of a newly developed dynamic three dimensional finite element solutions.(5) The strength and the post strength behaviors of the fundamental structural elements have been clarified both experimentally and analytically in the elevated temperatures. To this end a series of high temperature tests have been conducted on the shearing and bending resistances of bolted connections as well as flexural and local buckling of wide flange columns.

纽约世界贸易中心建筑物的崩溃表明，如果局部变热和弱化的成员失去优势，因此大火的整个框架可能会失去整体稳定性，并在最严重的情况下陷入渐进式崩溃。这项研究的目的是阐明控制钢框架的结构稳定性的因素，尤其是在火焰中进行钢框架的整体稳定性，尤其是对狂热的狂热量进行镇定，从而改善了镇定的量身形，从而使狂热的狂热量进行了狂热的杂物，从而进行了狂热的杂物，并进行了红色的杂物，并进行了狂热的狂热。从研究中找到了以下结果。（1）特定发现了控制大火中加热框架总体崩溃的机械必需品。（2）防止其整体崩溃中的火焰中的名人的因素已被确定并在理论上进行了表述。高大建筑物的动态故障已通过新开发的动态三维有限元解决方案来阐明。（5）在升高的温度下，在实验和分析上阐明了基本结构元素的强度和后强度行为。为此，已经对螺栓连接的剪切和弯曲电阻以及宽法兰柱的弯曲和局部屈曲进行了一系列高温测试。