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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 对钢柱的屈曲强度的影响。使用矩形截面的钢柱（SN490B JIS 级）进行了两组屈曲试验：（1）一组在恒定的高温下，（2）另一组在恒定的轴向载荷下逐渐升高的温度。第一个实验研究表明，在恒定高温下进行的试验表明，在室温下，诱导变形 R 导致的最大轴向载荷 Pmax 的降低可达 15%，但在 400 ℃以上，柱破坏轴向载荷仅比不诱导变形时稍低。从10℃到50℃，取决于轴力比从P/P_<yRT>=0.2到0.5。通过作者开发的一维有限元程序对这些试验的结果进行了模拟，结果表明，当采用适当的力学模型和钢材高温数据时，数值分析可以准确预测高温诱发变形柱的屈曲特性。用过的。