土木專業(yè)畢業(yè)設(shè)計(jì)中英對照外文翻譯--建筑結(jié)構(gòu)在沖擊負(fù)載作用下連續(xù)倒塌分析方法-建筑結(jié)構(gòu)-文庫吧
2025-04-17 14:29 本頁面
【正文】 結(jié)果?；诮惶婧奢d路徑法的 GSA和 DoD被發(fā)現(xiàn)可能給不出可靠的結(jié)構(gòu)連續(xù)倒塌預(yù)測并且常常低估爆炸破壞的柱子頂部支撐節(jié)點(diǎn)的應(yīng)力和應(yīng)變。 上面提到 DYN方法最為巨大的改進(jìn)是沖擊波和建筑結(jié)構(gòu)之間的相互作用，最初的爆炸和沖擊波傳播并不需要直接模擬。它運(yùn)用深厚的爆炸荷載分布理論來定義爆炸荷載然后把它們直接作用在結(jié)構(gòu)上。這能夠可觀的減少有限單元模型的尺寸，同時增加模擬的效率。 總得來說，直接模擬法能夠產(chǎn)生可信的結(jié)構(gòu)在爆炸和沖擊荷載作用下倒塌的預(yù)測結(jié)果，但是那是以大量的時間投入，淵博的結(jié)構(gòu)動力學(xué)、損 傷力學(xué)、動態(tài)材料特性和計(jì)算技巧為基礎(chǔ)的。因此，它不適用于實(shí)際工程應(yīng)用。這類方法的可行性可以按照以下的方法進(jìn)行改： 1）開發(fā)新的有限單元，不僅僅要易于建立和計(jì)算，并且能夠描述復(fù)雜的結(jié)構(gòu)構(gòu)件特性，如非線性和動力特性； 2）提出新的方法，準(zhǔn)確預(yù)測負(fù)荷爆炸周圍建筑結(jié)構(gòu)的不同的爆炸情景。隨著計(jì)算機(jī)科學(xué)的發(fā)展，與改善有限元模型和荷載運(yùn)用方法的進(jìn)步，直接模擬方法有可能成為進(jìn)行爆炸和沖擊荷載作用下結(jié)構(gòu)連續(xù)倒塌分析的一種準(zhǔn)確有效的方法。 原文出處： Methods for Progressive Collapse Analysis of Building Structures Under Blast and Impact Loads LI Zhongxian(李忠獻(xiàn) )， SHI Yanchao(師燕超 ) (School of Civil Engineering， Tianjin University， Tianjin 300072， China) 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 uation 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． Keywords： progressive collapse analysis； building structures； blast load： impact load 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”. 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 plete 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 ponent 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 progress
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