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Experimental study on inelastic lateral torsional buckling strength of H-shaped steel beam-columns under high axial force

高轴力作用下H型钢梁柱非弹性侧扭屈曲强度试验研究

基本信息

批准号：
13650638
负责人：
YAMAZAKI Shinji
金额：
$ 1.98万
依托单位：
Tokyo Metropolitan University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650638/
关键词：
steel structure beam-column buckling test lateral torsional buckling plastic buckling monotonic loading cyclic loading random loading 曲げ捩れ座屈

项目摘要

There is a case in which the energy absorption capacity of H-shaped beam-columns subject to axial forces and double curvature bending moment during severe earthquakes is limited by lateral torsional buckling. Most of past studies concerning the lateral torsional buckling of beam-columns in plastic range have been carried out only for cases where monotonic bending is loaded. However, beam-columns of multi-story frames are subjected to both fluctuating axial forces and cyclic bending moment during earthquakes. The fluctuating axial forces are caused by overturning moment and vertical vibrations. In this study, the maximum strength as well as the energy absorption capacity of beam-columns which is determined by lateral torsional buckling was studied by carrying out experiments under various loading conditions with consideration to the states in which columns are subjected to loads during earthquakes.The loading conditions in the experiments are as follows: (1) Monotonic horizontal loading … More under constant axial force, (2) Cyclic horizontal loading under constant axial force, (3) Cyclic horizontal loading under fluctuating axial force, (4) Random cyclic horizontal loading under random fluctuating axial force.When comparing the skeleton curve obtained from the relationship between the load and the deformation for the specimen subject to the cyclic horizontal load under constant axial force to the load-deformation relationship for the specimen subjected to monotonic horizontal loading under constant axial force, it is discernible that the maximum strength and the deformation at the time of maximum strength of the skeleton curve are smaller than those seen for the monotonic loading. In cases where the ultimate strength is determined by local buckling, it is generally known that the skeleton curve obtained from cyclic experiments nearly coincides with the monotonic loading curve. It was found out that the maximum strength is affected by plastic hysteresis when the strength is limited by lateral torsional buckling unlike the case in which the strength is determined by local buckling. This is so because in the case of the plastic lateral torsional buckling the buckling deformation progresses not only due to the increase in internal force as well as the extension of plastic regions but also due to the accumulation of plastic deformation caused by the cyclic bending about a strong axis. The effects of the fluctuating axial force and the plastic bending hysteresis upon the buckling strength and energy absorption capacity were clarified. Less

在大震作用下，H形梁柱在轴力和双曲率弯矩作用下的能量吸收能力受到侧扭屈曲的限制。以往对压弯构件在塑性区的侧扭屈曲的研究大多是针对单调弯曲的情况。然而，多层框架梁柱在地震作用下同时承受脉动轴力和循环弯矩的作用。倾覆力矩和竖向振动引起的脉动轴力。本文针对地震作用下梁柱的受力状态，通过试验研究了梁柱的最大承载力和由侧扭屈曲决定的能量吸收能力，试验的加载条件为：（1）单调水平加载 ...更多信息在恒定轴力作用下，（2）在恒定轴力作用下的循环水平荷载，（3）在波动轴力作用下的循环水平荷载，（4）随机波动轴力作用下的随机循环水平荷载。当将由恒定轴力作用下循环水平荷载作用下的试件的荷载与变形关系得到的骨架曲线与荷载-在恒定轴向力作用下承受单调水平荷载的试件的变形关系中，可以看出骨架曲线的最大强度和最大强度时的变形都小于单调荷载下的变形。在极限强度由局部屈曲确定的情况下，通常已知由循环试验获得的骨架曲线与单调加载曲线几乎重合。结果表明，与局部屈曲确定强度的情况不同，当强度受侧扭屈曲限制时，最大强度受塑性滞后的影响。这是因为在塑性侧扭屈曲的情况下，屈曲变形的发展不仅是由于内力的增加和塑性区的扩展，而且还由于围绕强轴的循环弯曲引起的塑性变形的累积。阐明了脉动轴力和塑性弯曲滞后对屈曲强度和吸能能力的影响。少