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A Study on Effective Use of Plastic Capacity of Steel Structural Members and Components

钢结构构件塑性能力有效利用的研究

基本信息

批准号：
01550366
负责人：
NISHIMURA Nobuo
金额：
$ 1.28万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01550366/
关键词：
steel structure elastoーplastic strain hardening limiting slenderness local buckling flexural member beam-column high strength steel 全塑性モ-メント降伏モ-メント

项目摘要

In this project, the following subjects were investigated theoretically and experimentally, in order to make the best use of plastic capacities of members and structural components for the design of steel structures ;1) In the existing design codes for steel structures, the strength of beam-columns under biaxial bending is verified using linear interaction formulae on cross-sectional strength and member stability corresponding to the first yielding. The redundancy from the first yielding to real ultimate strength is considerably large. So nonlinear interaction formulae for beam-columns with box or H-sec-tion are proposed. The proposed formulae are verified by the numerical and experimental investigations.2) The strength tests were carried out using the well designed H-section beam models which are appropriately combined of web's width-thickness ratio and flange's one in order to make clear the limiting slenderness for plate elements guaranteeing the cross-sectional yield strength. The interactional effect between web plate and flanges is3) Similarly, the limiting slenderness for plate elements of H-sections under the combination of bending and compression was examined by the elasto-plastic finite displacement analysis for solid plated structures. The limiting slenderness for yield strength and also plastic capacity of crossーsections are proposed.4) A new structural steel with low yield ratio (LYR) was developed for the improvement of ductility of high strength steel. The limiting slenderness for plate elements of H-section beams using new mate rial was examined by the FEM analysis. To the limiting slenderness for plastic capacity of cross-section the LYR steel can give some efficiency for the possibility of free design.

为了更好地利用构件和构件的塑性能力进行钢结构设计，本课题进行了以下方面的理论和试验研究：1)在现行钢结构设计规范中，对双向受弯构件的强度验算采用了首次屈服对应的截面强度和构件稳定性的线性相关公式。从第一次屈服到真正的极限强度的冗余度相当大。在此基础上，提出了箱形或H型截面梁柱的非线性共同作用公式。2)采用腹板宽厚比与翼缘宽厚比合理组合的H型截面梁模型进行了强度试验，明确了保证截面屈服强度的板件极限长细比。腹板和翼缘的共同作用是3)同样，通过实心板结构的弹塑性有限位移分析，考察了H型截面板件在弯曲和受压共同作用下的极限长细。提出了ー截面的屈服强度和塑性极限长细比。4)为提高高强度钢的延性，研制了一种新型低屈服比结构钢。通过有限元分析，对采用新材料的H型截面梁板单元的极限长细进行了检验。对于截面塑性极限长细，LYR钢可以为自由设计的可能性提供一定的效率。