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.

这项研究的目的是量化涉及弯曲，局部和平面外屈曲之间相互作用的钢筋的滞后特性。为了获得有关这些特征的基本信息，进行了一系列准静态负载测试，并通过比较实验结果和分析结果来检查分析溶液的准确性和局限性。在测试中，两个宽度比（检查局部屈曲的效果），两个横截面（宽范围和狭窄的截面），四个细长的比率（检查后弯曲范围内的强度降低），以及两个偏心率的比率。从测试中发现（a）（a）平面内和平面外变形在狭窄的截面方面都是值得注意的，而对于宽范围的部分，平面内变形在较小的较小变形中占主导地位，平面外变形在中等大尺寸的变形，并再次促进较大的变形中较大变形; （b）对于较大的细长比率，包括显着扭转的平面外变形更为明显；（c）由于局部变形的生长，较短的支撑较早（延性较小）；（d）在断裂和累积塑性应变之间观察到很强的相关性。测试和分析之间的比较表明，弯曲后范围内的最大强度和强度降解都可以通过分析合理地估算，并且分析可以追溯到平面内变形占主导地位时的磁滞，但是在追踪牙套的滞疗行为中，在哪些超过平面畸形的轴承术中均大。