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

• 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

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.

为了研究受热钢梁热伸长诱导节点平移角R对钢柱屈曲强度的影响，对SN490BJIS级矩形截面钢柱进行了两组屈曲试验：(1)恒定高温和(2)恒定轴向荷载作用下的高温屈曲试验。第一组试验表明，在常温下，诱导变形R可使最大轴向荷载Pmax降低15%，但在400℃以上时，最大轴向荷载Pmax可降低15%。第二个试验研究表明，在恒定轴力作用下，随着温度的升高，柱的破坏温度Tcr可降低10℃到50℃，这取决于P/P&lt的轴力比；用作者开发的一维有限元程序对试验结果进行了模拟，结果表明，如果采用合适的力学模型和高温下的钢材数据，数值分析可以准确地预测高温诱导变形的柱的屈曲特性。

项目成果

茶圓敦: "矩形断面鋼柱模型の高温時座屈実験(その5 SN490Bの場合)"日本建築学会研究報告 九州支部. 第40号. 457-460 (2001)

Atsushi Chaen：“矩形截面钢柱模型的高温屈曲实验（第5部分SN490B案例）”日本建筑学会九州分会研究报告第40. 457-460（2001）。

Okabe Takeshi: "Buckling Strength of Steel Columns with Induced Joint Tanslation Angle at High Temperature"Journal of Strcuctural Engineering. Vol.49B. 375-382 (2003)

Okabe Takeshi：“高温下诱导接头平移角钢柱的屈曲强度”结构工程杂志。

岡部 猛: "Proc. of Designing Structures for Fire"Buckling Strength of Steel Columns with Induced deformation at Increasingly Higher Temperatures (印刷中). (2003)

Takeshi Okabe：“防火结构设计过程”在逐渐升高的温度下引起变形的钢柱的屈曲强度（印刷中）（2003 年）。

Chaen Atsushi: "The Effect of Time on the Budding Characteristics of Steel Columns Subjected to High Temperatures"Proceedings of Sixth Pacific Structural Steel Conference. Vol.1. 527-532 (2001)

Chaen Atsushi：“时间对高温下钢柱出芽特性的影响”第六届太平洋结构钢会议论文集。

立川 貴之: "強制部材角を受ける鋼柱の高温時の座屈荷重"日本建築学会研究報告 九州支部. 第42号. 373-376 (2003)

Takayuki Tachikawa：“受力构件角钢柱的高温屈曲载荷”日本建筑学会九州分会研究报告第42. 373-376号（2003年）。