Methods for progressive collapse analysis of building structures under blast and impact loads

Abstract

Abstract：Progressive collapse of building structures under blast and impact loads has attracted great attention all over the world. Progressive collapse analysis is essential for an economic and safe design of building structures against progressive collapse to blast and impact loads. Because of the catastrophic nature of progressive collapse and the potentially high cost of constructing or retrofitting buildings to resist it, it is imperative that the progressive collapse analysis methods be reliable. For engineers, their methodology to carry out progressive collapse evaluation need not only be accurate and concise, but also be easily used and works fast. Thus, many researchers have been spending lots of effort in developing reliable, efficient and straightforward progressive collapse analysis methods recently. In the present paper, current progressive collapse analysis methods available in the literature are reviewed. Their suitability, applicability and reliability are discussed. Our recent proposed new method for progressive collapse analysis of reinforced concrete frames under blast loads is also introduced.Progressive collapse is defined as "the spread of an initial local failure from element to element resulting in the collapse of an entire structure or a disproportionately large part of it" [1] . It refers to the failure of one or a group of key structural load-carrying members that give rise to a more widespread failure of the surrounding members and partial or complete structural collapse. Progressive collapse of building structures might be induced by a series of accidental and intentional events, such as false construction order, local failure due to accidental overload, damage of critical component by explosion and earthquake. This paper only focuses on progressive collapse analysis of building structures induced by abnormal loads, such as blast and impact.With the recent progressive collapse of Alfred P. Murrah Federal Building and World Trade Center (WTC), researches are more focused than ever on constructing buildings safer from progressive collapse induced by blast and impact loads. Progressive collapse analysis is essential for an economic and safe design of building structures against progressive collapse to blast and impact loads. Because of the catastrophic nature of progressive collapse and the potentially high cost of constructing or retrofitting buildings to resist it, it is imperative that the progressive collapse analysis methods be reliable [2] . For engineers, their methodology to carry out progressive collapse evaluation need not only to be accurate and concise, but also be easily used and works fast. Thus, many researchers have been spending lots of effort in developing reliable, efficient and straightforward progressive collapse analysis methods recently.The current available methods in analyzing structural progressive collapse could be classified into two major categories, namely the direct simulation method, in which the blast loading effects on structural damage and building coll...

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Structures under Synergetic Effects of Combined Blast and Impact Loads: A State‐of‐the‐Art Review

“…Reinforced concrete beams [8][9][10] and columns [6,7,11] were explicitly investigated under synergetic effects of combined blast and impact loads. Zhongxian and Yanchao [12] also developed a new method for progressive collapse analysis of framed building structures prone to blast and impact loads.…”

“…Moreover, Li and Yanchao [12] proposed a new method for progressive collapse analysis of RC building. e proposed method is accompanied by three stages.…”

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