文档介绍：西安建筑科技大学硕士论文
构件失效时间对 RC 框架结构连续倒塌动力效应影响分析
专业:工程力学
硕士生:屠冰冰
指导教师:赵冬教授
摘要
连续倒塌是指偶然荷载作用下结构发生初始局部破坏后,在自重作用下,破
坏向横向和竖向蔓延,进而产生连锁反应,最终导致破坏范围和破坏程度与初始
范围和程度不成比例。近年来,强震、恐怖袭击等原因引起结构发生连续倒塌的
重大事件频繁发生,促使这一领域的研究受到普遍关注。
本文结合国内外既有研究成果,参考美国公共事务管理局(GSA)准则和美
国国防部(DOD)准则,分析了 RC 框架结构连续倒塌的破坏特点及破坏机理,
着重探讨了连续倒塌过程先后经历的三个阶段:弹性阶段、塑性阶段和悬链线阶
段的受力和变形情况。`
本文以失效时间为关键因素,采用拆除构件法,分别从理论推导和数值模拟
两方面,分析了构件失效时间对 RC 框架结构失效点(失效构件顶点)位移、速度、
加速度和动力放大系数的影响。先以两层两跨 RC 框架结构为例,推导某一关键构
件失效时间与失效点动位移和动力放大系数的关系。之后,结合工程实例,对某 4
层 3 跨 RC 框架结构底层短边中柱失效过程进行数值模拟,将初始状态与关键构件
完全失效状态下的轴力、整体位移和失效点位移进行对比,着重分析了关键构件
完全失效后,失效点位移、速度、加速度和动力放大系数随构件失效时间的变化
规律。
本文旨在说明 RC 框架结构连续倒塌过程中,关键构件失效时间是影响失效点
动力效应的关键性指数,是失效点动力放大系数选取的主要依据。
关键词:连续倒塌;拆除构件法;动力效应;失效时间
论文类型:应用研究
西安建筑科技大学硕士论文
西安建筑科技大学硕士论文
The Influence Analysis ponent Failure Time to The
Dynamic Progressive Collapse of RC Frame Structure
Speciality: Engineering Mechanics
Postgraduate: Tu Bingbing
Instructor: Prof. Zhao Dong
Abstract
Progressive collapse refers to the structural damage then deteriorated down to
horizontal and vertical ways result from gravity, it result in disaster condition and
pare to when it has been impacted directly by contingency load. In
recently years. It has been attracted to large number of researcher to study that the
strong earthquakes and terrorist events caused the progressive collapse of structures.
After summarizing the achievements in this field, the bined GSA
Progressive Collapse Analysis and Design Guidelines and DOD Design of Buildings to
Resist Progressive Collapse to analyze the characters and mechanism of progressive
collapse. Then the force and deformation was discussed during the elastic stage, the
plastic stage and the catenary stage,that process occered during progressive collapse
early or later.
Using alternate path method and seeing the failure time as the key factor, this paper
did the theory and numerical analysis of the effect of failure time to the failure point