Buckling Strength of Steel Columns with Induced Deformation at Increasing High Temperature

高温诱发变形钢柱的屈曲强度

基本信息

批准号：
12650578
负责人：
OKABE Takeshi
金额：
$ 2.3万
依托单位：
Kumamoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650578/
关键词：
Fire Resistant Design Steel Structure Viscous Elastic Plastic behavior Buckling at High Temperature Buckling Strength Column Strain Rate Creep at High Temperature

项目摘要

An experimental and analytical study was conducted to evaluate the effects of induced joint translation angle R caused by the thermal elongation of connected heated steel beams on the buckling strength of steel columns.Two sets of buckling tests were performed using steel columns (SN490B JIS grade) with a rectangular cross-section: (1) one at a constant high temperature and (2) the other at increasingly higher temperatures under a constant axial load.The first experimental study, using tests at a constant high temperature, indicated that the reduction of the maximum axial load Pmax due to induced deformation R can be up to 15% at room temperature, but, at above 400℃, the column failure axial load is only slightly lower man that without inducing the deformation.The second experimental study, using tests at increasingly higher temperatures under a constant axial load, indicated that the reduction in the column failure temperature Tcr due to induced deformation R can be from 10℃ to 50℃, depending on the axial force ratio from P/P_<yRT>=0.2 to 0.5.The results of these tests were simulated by a one-dimensional finite-element procedure developed by the author, and it was shown that numerical analysis can be used to provide accurate predictions of the buckling characteristics of columns with an induced deformation at high temperatures when an appropriate mechanical model and data of steel materials at high temperature are used.

进行了实验和分析研究，以评估由连接的加热钢梁的热伸长引起的诱导接头平移角 R 对钢柱屈曲强度的影响。使用钢柱（SN490B JIS 等级）进行了两组屈曲试验具有矩形横截面：（1）一个在恒定的高温下，（2）另一个在恒定的轴向载荷下在越来越高的温度下。第一个实验研究，使用恒定高温下的测试，表明减少最大诱导变形R引起的轴向载荷Pmax在室温下可达15%，但在400℃以上时，柱破坏轴向载荷仅比不诱导变形时稍低。第二个实验研究，使用越来越多的试验在恒定轴向载荷下的较高温度下，表明由于诱导变形 R 导致的柱失效温度 Tcr 的降低可以从 10℃ 到 50℃，具体取决于轴向力比P/P_<yRT>=0.2至0.5。这些试验的结果通过作者开发的一维有限元程序进行了模拟，结果表明数值分析可以用来准确预测屈曲特性当使用适当的力学模型和高温钢材数据时，可以计算出在高温下引起变形的柱子。