Calculation of load increase factors for assessment of progressive collapse potential in framed steel structures

Osama Ahmed Mohamed
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引用次数: 21

Abstract

Progressive collapse of building structures is a relatively rare event. However, the consequences of progressive collapse may be catastrophic in terms of injuries and loss of lives. In addition, in many parts of the world including the United States of America, Europe, Asia, and recently, United Arab Emirates, there is a trend to build taller and more structurally complicated buildings with adventurous load paths. Therefore, structural design that takes into account the potential for progressive collapse is becoming critical. This paper outlines and discusses the process of estimating the load increase factor (LIF) needed for progressive collapse resistant design of steel building structures that takes into account the effects of component ductility on structural response following the initiation of collapse. LIF are used to account for the dynamic effects of column/wall removal when the designer opts for linear or nonlinear static analysis to assess the potential for progressive collapse. The approach recognizes the difference in response associated with deformation-controlled compared to force-controlled response quantities and structural elements. Emphasis in this paper is on the Alternate Path (AP) approach which is the most commonly used approaches for progressive collapse resistant design of building structure that fall under Occupancy Category II.

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框架钢结构连续倒塌潜力评估中荷载增加系数的计算
建筑物结构的逐渐倒塌是一个相对罕见的事件。然而,就伤害和生命损失而言,进行性塌陷的后果可能是灾难性的。此外,在世界上的许多地方,包括美国、欧洲、亚洲和最近的阿拉伯联合酋长国,有一种趋势,即建造更高、结构更复杂的建筑,并采用冒险的荷载路径。因此,考虑到潜在的渐进倒塌的结构设计变得至关重要。本文概述并讨论了考虑构件延性对开始倒塌后结构响应影响的钢结构逐步抗倒塌设计所需荷载增加系数(LIF)的估算过程。当设计者选择线性或非线性静力分析来评估逐渐倒塌的可能性时,LIF用于解释柱/墙拆除的动态影响。该方法识别了与变形控制的响应量和结构单元相比,力控制的响应量和响应量的差异。本文的重点是替代路径(AP)方法,这是第二类使用建筑结构的渐进抗倒塌设计中最常用的方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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