框架结构悬链线效应研究新进展

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doi:10.6052/1000-0992-11-065

何政^1,2,,,
黄国辉²

1.
大连理工大学土木工程学院, 大连 116024
2. 东北大学资源与土木工程学院, 沈阳 110004

基金项目:国家自然科学基金项目(90915005,51161120359);教育部新世纪优秀人才项目(NCET-08-0096)资助

详细信息

作者简介:
何政,男,博士,教授,博士生导师,1971年出生于安徽巢湖市.1994年毕业于哈尔滨建筑大学建筑工程专业,获工学学士学位,2000年毕业于哈尔滨工业大学工程力学专业并获工学博士学位,2003年于哈尔滨工业大学土木工程博士后流动站出站.1996年在哈尔滨建筑大学(2000年6月合并入哈尔滨工业大学)留校工作,2004年11月调入东北大学任职教授、博士生导师,2010年调入大连理工大学任职教授、博士生导师.作为教育部留学基金委公派访问学者,先后于2004年和2009年赴加拿大University of Toronto(UofT)土木工程系和美国University of Illinoisat Urbana-Champaign(UIUC)土木与环境工程系各进修一年.目前主要从事混凝土结构抗震性能设计、FRP增强混凝土结构性能与设计以及结构非线性分析方面的研究工作,主持国家自然科学基金项目3项,参与其他国家级和省、部级重点和面上项目多项,目前,在国内外学术期刊和国际会议上发表学术论文近90篇,其中SCI和EI检索35篇,主编国家“十一五”规划教材1部,担任《应用基础与工程科学学报》编委,国际结构用FRP材料协会和美国混凝土协会440分会委员,担任5个国际期刊和20个国内期刊的审稿人,2008年成功入选2008年度教育部“新世纪优秀人才支持计划”.

通讯作者:
何政

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出版历程
- 收稿日期:2010-05-03
- 修回日期:2012-03-02
- 刊出日期:2012-09-25

PROGRESS IN STUDIES OF CATENARY ACTION IN FRAME STRUCTURES

HE Zheng^1,2,,,
HUANG Guohui²

1.
Department of Civil Engineering, Dalian University of Technology, Dalian 116024, China
2. College of Resources and Civil Engineering, Northeastern University, Shenyang 110004, China

Funds:The project was supported by the National Natural Science Foundation of China (90915005,51161120359),the Program for New Century Excellent Talentsin University (NCET) of the Ministry of Education of China (NCET-08-0096)

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Corresponding author:HE Zheng

摘要

摘要:本文主要研究框架结构悬链线效应方面的新进展,并着重对钢筋混凝土框架结构与钢框架结构悬链线效应的区别,以及强震作用下框架结构连续倒塌过程中的悬链线效应进行了探讨.本文首先介绍悬链线效应的概念,即处于结构整体中的水平构件在失去抗弯能力后,通过轴力和很大挠度形成的力矩来抵抗外载荷产生的弯矩的现象.在火灾、强震等作用下,框架结构局部梁构件会依次进入弹性状态、弹塑性状态,进而屈服产生塑性铰,成为瞬变机构,此时梁构件的挠度会迅速增大,形成悬链线效应,当塑性铰失效时,则会产生机械铰,当悬索拉力超过极限承载能力时,机械铰断裂.其次通过算例来研究两端铰接约束梁在小变形状态下轴力与挠度形成的力矩与弯曲抵抗力矩的比值随载荷、跨度以及截面高宽比变化的关系.接着对国内外学者的框架结构悬链线效应研究进行系统的分析和总结,重点研究钢筋混凝土梁构件由压拱效应向悬链线效应的转化过程.最后对框架结构悬链线效应研究需要进一步开展的工作进行探讨和展望,通过利用悬链线效应的强度储备来增强结构的潜在强度和抗倒塌能力.
- 框架结构/
- 水平构件/
- 悬链线效应/
- 失效断裂
Abstract:Latest progress in the study of catenary action in frame structures is reviewed.Firstly,the concept of catenary action is introduced,that is,while horizontal elements in structural system had lost their flexural capacity,the moment generated by external loads could be sustained through torque formed by axial force and a large deflection.Under strong ground motions,a frame would experience elastic deformation,cracking,steel yielding,plastic rotation,crushing and even the fail of components.In some circumstances,the deflection of failed beams generally develops substantially,leading to the transition from flexural resisting system to combined catenary and flexural system.Plastic hinges would turn into mechanical hinges if their limit rotation capacities are exceeded.With increasing tensile forces,the mechanical hinges could fail due to rupture or pull-out of longitudinal reinforcing bars from joint zone.Secondly,an example is presented to study the relationship of the ratio between the torque formed by axial force and a large deflection and the bending resistance moment of restrained beam hinged at both ends in the small deformation state,which varies with load,span and aspect ratio of cross section.Thirdly,the overview of research on catenary action is analyzed and summarized,with focus laid on the process of arch action transformed into catenary action of RC beams.Finally,further developments are suggested and discussed.
- frame structure/
- horizontal element/
- catenary action/
- failure and fracture

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