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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回特性，包括弯曲屈曲、局部屈曲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，并通过将试验结果与分析结果进行比较，检验了解析解的精度和局限性。在试验中，选择了两个宽厚比(以考察局部屈曲的影响)、两个截面(宽翼缘和窄翼缘截面)、四个长细比(以考察后屈曲范围内的强度劣化)和两个偏心率。试验发现：(A)窄翼缘截面的面内变形和面外变形均较显著，而宽翼缘截面在小变形时以面内变形为主，在中等变形量时面外变形占主导地位，大变形时又促进面外变形；(B)长细比越大，面外变形越明显；(C)由于局部变形的增长，较短的支撑断裂较早(延性较小)；(D)断裂与累积塑性应变之间存在很强的相关性。试验结果与分析结果对比表明，该分析方法能较好地估计后屈曲范围内的最大强度和强度退化，并能跟踪面内变形为主时的滞回现象，但不能跟踪离面变形较大的支撑的滞回性能。