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.

进行了一项实验和分析研究，以评估由连接的加热钢梁的热伸长在钢柱的屈曲强度上引起的诱导关节平移角R的影响。两组屈曲测试是使用钢柱（SN490B JIS等级）进行的，该弯曲柱（SN490B JIS等级）具有矩形跨度较高的恒定高度较高的高温和其他次数，在恒定的高温下（1）越来越高（1）（1）（1）越来越高（1）（2）（2）（2）（2）（2）（2）（2）（2）（2）（2）研究在恒定的高温下使用测试表明，由于诱导的变形r引起的最大轴向负荷PMAX的减少可以在室温下高达15％，但在室温下，在400℃以上，柱故障轴向负载仅略低，而无需诱导变形。第二次实验性研究可能会导致持续的轴向载荷，这表明持续的轴向载荷，这是恒定的轴向载荷，该轴向均可置于恒定的轴向载荷，该轴向轴向均可置于恒定的轴向量，该轴向轴向均可置于轴向量的范围，该轴向轴向均可置于恒定的轴向量，并将其重新降低。从10英尺到50℃，取决于轴向力比从p/p_ <yrt> = 0.2到0.5。这些测试的结果是通过作者开发的一维有限元元素程序模拟的，并且证明数值分析可用于在较高的温度下进行钢制材料的贴模设备的准确预测，以提供准确的柱子屈曲特征，并在高音上进行钢制的模型。