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Seismic Design Coefficients Considerations When Using ASCE 7 For Seismic Retrofit

机译：使用ASCE 7进行抗震改造时的抗震设计系数和注意事项

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The reality of retrofitting an existing structure is that it will be more complicated than designing a new structure because the existing structure is not afforded prescriptive provisions that allow for a simplified new design approach. If ASCE 7 is chosen as a means to retrofit a structure, the retrofitted structure must meet the intent of the document in its entirety. Restrictions in ASCE 7 are put in place to ensure the performance claimed by the code, and omitting a code requirement therefore voids the performance objectives of ASCE 7. However, because no existing building (even a retrofitted one) will meet every provision in ASCE 7, considerable judgement and considerations including those outlined in this paper will be necessary to produce an effective retrofit. Consequently, despite the imperfections of ASCE 41, considerably more engineering judgement is needed to effectively retrofit an existing structure using ASCE 7 than using ASCE 41. This paper is not intended to be an exhaustive list of issues encountered when using ASCE 7 to retrofit existing buildings. However, the authors intend for this paper to have identified and lent some clarity to major issues that have historically led to ineffective evaluations and retrofits of existing buildings.
机译：改造现有结构的现实情况是，与设计新结构相比，它要复杂得多，因为没有为现有结构提供规定性条款，而这些条款不允许采用简化的新设计方法。如果选择ASCE 7作为翻新结构的方法，则翻新的结构必须完全符合文档的意图。对ASCE 7进行了限制以确保代码要求的性能，因此省略代码要求将使ASCE 7的性能目标无效。但是，由于没有现有建筑物（即使是翻新的建筑物）也可以满足ASCE 7中的所有规定。 ，需要进行大量的判断和考虑，包括本文概述的内容，才能进行有效的改造。因此，尽管有ASCE 41的不完善之处，但使用ASCE 7进行有效改建比使用ASCE 41需要更多的工程判断。本文不打算详尽地列举使用ASCE 7改建现有建筑物时遇到的问题。 。但是，作者希望本文能够识别和澄清一些主要问题，这些主要问题历来导致对现有建筑物进行无效评估和改造。

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