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李  立，  劉春明，  李楚舒
(中國(guó)建筑標(biāo)準(zhǔn)設(shè)計(jì)研究院北京金土木軟件技術(shù)有限公司，北京100044)

[摘要] 對(duì)于某些類(lèi)型的結(jié)構(gòu)設(shè)計(jì)（特別是多層工業(yè)廠房），需要考慮活荷載的不利布置，由于計(jì)算量的原因，以往的工程做法和相關(guān)規(guī)范往往采用近似的方法，本文介紹了一種快速求解活荷載不利布置的通用方法。這種通過(guò)荷載工況組合的新方法可以得到任意構(gòu)件在活荷載所有可能布置的設(shè)計(jì)內(nèi)力的包絡(luò)，是一種高效、通用的新方法。這種被稱(chēng)為“Range Add”的荷載組合新方法已經(jīng)在SAP2000中實(shí)現(xiàn)，本文還給出了SAP2000對(duì)某鋼框架廠房和某無(wú)梁樓蓋的算例，分析活荷載不利布置在不同階段對(duì)構(gòu)件設(shè)計(jì)的影響。
[關(guān)鍵詞] 活荷載不利布置；SAP2000；荷載組合

A Quick Generalized Method for Unfavorable Live Load Distribution
Li Li, Liu Chunming, Li Chushu
( China Institute of Building Standard Design & Research Beijing Civil King Software Tech Co., Ltd Beijing 100044)

Abstract: In the design of some structures, especially for the multi - storey industrial plant, unfavorable live load distribution should be considered. In order to avoid the time - consuming calculation, approximate simplified methods were adopted in the engineering practice or the related codes. In this paper,a quick generalized method for unfavorable live load distribution is introduced.  Through a new method of load combination, which named "Range Add", the envelope of the member design forces could be calculated under any possible live load distribution.  "Range Add" had been introduced into SAP2000. The examples of a steel frame plant and a flat floor are given in this paper, analyzing the effect of the unfavorable live load distribution to the structural design by using SAP2000.
Keywords: unfavorable live load distribution; SAP2000; load combination