非分支型变形模式突变失稳现象与机理分析  

A NON-BIFURCATION INSTABILITY ACCOMPANIED WITH ABRUPT DEFORMATION MODE CHANGE:THE PHENOMENON AND MECHANISM ANALYSIS

作　　者：陈以一 黄德键[2] 廖芳芳 程欣[4] 曹强[1] CHEN Yi-yi;HUANG De-jian;LIAO Fang-fang;CHENG Xin;CAO Qiang(School of Engineering,Shanghai Sanda University,Shanghai 201209,China;College of Civil Engineering,Tongji University,Shanghai 200092,China;School of Civil Engineering,Chang’an University,Xi’an,Shaanxi 710061,China;College of Civil Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China)

机构地区：[1]上海杉达学院工程学院,上海201209 [2]同济大学土木工程学院,上海200092 [3]长安大学建筑工程学院,陕西西安710061 [4]太原理工大学土木工程学院,山西太原030024

出　　处：《工程力学》2025年第2期15-23,共9页Engineering Mechanics

基　　金：国家自然科学基金面上项目(52378168)。

摘　　要：基于对单向受弯角钢构件的研究,发现了一种尚未被结构稳定理论所深入探讨的构件整体失稳模式,称之为“非分支型变形突变模式”。讨论了这种失稳模式在临界点路径唯一性上和引发机制上与经典分支型失稳、极值型失稳的区别。考察了具有这种特征的失稳模式在其他场景中的表现和触发机制,表明这类失稳并非局限于某一特定截面构件、特定受力方式和特定的产生原因,但其具有共性规律。分析了对这类失稳现象和机理进行深入研究的必要性和主要研究内容。Based on the study on steel angle members subject to unidirectional bending around the major axis,a global instability mode that has not been deeply explored in structural stability theory was discovered,which is called‘non-bifurcation instability accompanied with abrupt deformation mode change’.The differences between this instability mode and the classic bifurcation instability and ultimate instability are discussed in terms of the uniqueness of the deformation routine at the critical point,as well as the triggering mechanism.It is further shown that the featured instability can be possible in other background and with other triggering mechanism,indicating that this type of instability is not limited to a specific cross-section member,a specific force mode,or a specific cause,but it has common laws.The necessity for thorough study on the potential instable behavior and mechanism,as well as the research contents,is proposed.

关 键 词：构件整体失稳 角钢 应力塑性重分布 多重失稳相互影响 工程应用研究 

分 类 号：TU311.2[建筑科学—结构工程]