外文翻譯---通過建筑結(jié)構(gòu)設(shè)計以改善建筑物的抗倒性-在線瀏覽
2025-03-05 12:08本頁面
【正文】 in which structural engineers can best configure their structures so as to provide enhanced resistance to resist progressive collapse The two most frequently used design approaches intended to address the issue of progressive collapse are:*c Providing tying capacity *c Checking alternate load pathsFigure 1: Tie Forces in a Frame Structure The first is essentially prescriptive and consists of ensuring that beams, columns, connections and floor (or roof) can act together to provide a specified minimum level of horizontal tying resistance。 Robustness。外文原稿2The Twelfth East AsiaPacific Conference on Structural Engineering and Construction Design of Building Structures to Improve their Resistance to Progressive Collapse D A Nethercota a Department of Civil and Environmental Engineering, Imperial College LondonAbstract：It is rare nowadays for a “new topic” to emerge within the relatively mature field of Structural Engineering. Progressive collapseor, more particularly, understanding the mechanics of the phenomenon and developing suitable ways to acmodate its consideration within our normal frameworks for structural designcan be so regarded. Beginning with illustrations drawn from around the world over several decades and culminating in the highly public WTC collapses, those features essential for a representative treatment are identified and early design approaches are reviewed. More recent work is then reported, concentrating on developments of the past seven years at Imperial College London, where a prehensive approach capable of being implemented on a variety of levels and suitable for direct use by designers has been under development. Illustrative results are used to assist in identifying some of the key governing features, to show how quantitative parisons between different arrangements may now be made and to illustrate the inappropriateness of some previous design concepts as a way of directly improving resistance to progressive collapse.2011 Published by Elsevier Ltd. Keywords: Composite structures。 Progressive Collapse。 Steel structures。 the actual values required are normally related to the vertical loading. Figure 1, which is taken from recent US Guidance (SEI 2010), illustrates the principle. The approach is simple to appreciate, requires minimal structural calculation and, in situations where the original provisions are found to be inadequate, can be made to work by providing more substantial connections and/or additional reinforcement in floor slabs In an interesting recent development, that recognizes the link to the generation of catenary action, US Guidance has restricted the use of tying between the structural members to situations in which it can be demonstrated that the associated connections can carry the required forces whilst undergoing rotations of radiance. Where this is not possible, tying should act through the floors and the roof. However, recent studies (Nethercot et al 2010a。 for example, recent thinking in the United States (SEI 2010) makes provision for any of: linear static, nonlinear static or nonlinear dynamic analysis and provides some guidance on the use of each. It may also be used as the basis for more sophisticated numerical studies of particular structures and particular incidents . forensic work。 where these require putation
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