Interaction among Flexural, Local, and Out-of-Plane Bucklings in Hysteretic Behavior of Steel Braces

钢支撑滞回行为中弯曲、局部和面外屈曲之间的相互作用

基本信息

批准号：
08455259
负责人：
NONAKA Taijiro
金额：
$ 3.84万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455259/
关键词：
Steel Structure Brace Wide-Flange Section Experiment Hysteresis Lateral-Torsional Deformation

项目摘要

The goal of this study is to quantify the hysteretic characteristics of steel braces that involve interaction among flexural, local, and out-of-plane bucklings. To obtain basic information on these characteristics a series of quasi-static loading tests were carried out, and accuracy and limitation of analytic solutions were examined through comparison between the experimental and analytical results. In the tests, two width-to-thickness ratios (to examine the effect of local buckling), two cross-sections (wide-flange and narrow-flange sections), four slenderness ratios (to examine the strength deterioration in the post-buckling range), and two ratios of eccentricity were chosen. It was found from the tests that (a) both in-plane and out-of-plane deformations were notable for narrow-flange sections, whereas for wide-flange sections, in-plane deformation was dominant in small deformations, out-of-plane deformation grew in medium magnitudes of deformation, and again in-plane deformation promoted in large deformations ; (b) out-of-plane deformation including significant torsion was more pronounced for larger slenderness ratios ; (c) shorter braces broke earlier (with smaller ductility) due to the growth of local deformation ; and (d) strong correlation was observed between the breakage and cumulative plastic strain. Comparison between the test and analysis revealed that both the maximum strength and strength degradation in the post-buckling range can be estimated reasonably by the analysis, and the analysis can trace the hysteresis when in-plane deformation dominates, but the analysis fails in tracing the hysteretic behavior of braces in which out-of-plane deformation is large.

本研究的目的是量化钢支撑的滞后特性，其中涉及弯曲、局部和平面外屈曲之间的相互作用。为了获得这些特性的基本信息，进行了一系列准静态加载试验，并通过实验和分析结果的比较来检查解析解的准确性和局限性。试验中采用了两个宽厚比（考察局部屈曲的影响）、两个截面（宽翼缘截面和窄翼缘截面）、四个长细比（考察屈曲后的强度劣化情况）。范围），并选择了两个偏心率比。试验发现：(a)对于窄翼缘截面，面内变形和面外变形均显着，而对于宽翼缘截面，小变形以面内变形为主，面外变形占主导地位。平面变形在中等变形量中增长，而面内变形在大变形量中又得到促进； (b) 长细比越大，面外变形（包括显着扭转）越明显； (c) 由于局部变形的增长，较短的支撑较早断裂（延展性较小）； (d)观察到断裂和累积塑性应变之间存在很强的相关性。试验与分析对比表明，通过分析可以合理估计屈曲后范围内的最大强度和强度退化，并且分析可以追踪面内变形占主导地位时的滞后现象，但分析无法追踪屈曲后范围内的滞后现象。平面外变形较大的支撑的滞后行为。