外文翻譯---通過建筑結(jié)構(gòu)設(shè)計(jì)以改善建筑物的抗倒性-文庫吧資料
2025-01-22 12:08本頁面
【正文】 s (support)*c) Ultimate capacity of the system (failure of the bottom bolt row of the midspan connection)*d) The axial load bees zero (the deflection of the beam where the axial load changes from pressive to tensile)*e) The deflection of the beam where the axial load bees equal to the flange capacity of one of the connections (midspan connection)Figure 3: Nonlinear static response for a single beam 中文翻譯2通過建筑結(jié)構(gòu)設(shè)計(jì)以改善建筑物的抗倒性D A Nethercota 土木與環(huán)境工程學(xué)院——倫敦帝國(guó)學(xué)院摘 要：如今的“新話題”出現(xiàn)在相對(duì)成熟的結(jié)構(gòu)工程領(lǐng)域這是一件罕見的事。 the best of these–which are likely to be putationally very demanding–have demonstrated their ability to closely replicate actual observed behaviour.3. Essential features of progressive collapse Three features have previously (Nethercot 2010) being identified as essential ponents of any reasonably realistic approach to design against progressive collapse:*c Events take place over a very short timescale and the actual failure is therefore dynamic.*c It involves gross deformations, generating large strains, leading to inelastic behaviour as well as change of geometry effects.*c Failure essentially corresponds to an inability of the structure in its damaged state to adopt a new position of equilibrium without separation of key elements.Figure 2: Simplified multilevel approach for progressive collapse assessment Additional features, designed to make the approach attractive for use by practicing Engineers have also been proposed (Nethercot 2010):*c Process should consist of a series of steps broadly similar in concept to those used for “conventional” structural design.*c It should, preferably, be capable of implementation at a variety at levels of plexity–with the choice reflecting the importance of the structure.*c Any required analysis should utilise familiar techniques。 Nethercot et al 2010b) have suggested that tying capacity correlates poorly with actual resistance to progressive collapse. Moreover, being prescriptive, it does not permit the meaningful parison of alternative arrangements a fundamental feature of structural design. In its most frequently used form the alternative load path approach presumes the instantaneous loss of a single column and then requires that the ability of the resulting damaged structure to bridge the loss be demonstrated by suitable calculation (Gudmundsson and Izzuddin 2010). The approach may be implemented at varying levels of sophistication in terms of the analysis。 Structural design1. Introduction Over time various different structural design philosophies have been proposed, their evolutionary nature reflecting：*c Growing concern to ensure adequate performance. *c Improved scientific knowledge of behaviour. *c Enhanced ability to move from craft based to science based and thus from prescriptive to quantitatively justified approaches This can be traced through concepts such as: permissible stress, ultimate strength, limit states and performance based. As clients, users and the general public have bee increasingly sophisticated and thus more demanding in their expectations, so it became necessary for designers to cover an ever increasing number and range of structural issues–mostly through consideration of the “reaching this condition would be to a greater or lesser extent unacceptable” approach. Therefore issu
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