李  立，  刘春明，  李楚舒
(中国建筑标准设计研究院北京金土木软件技术有限公司，北京100044)

[摘要] 对于某些类型的结构设计（特别是多层工业厂房），需要考虑活荷载的不利布置，由于计算量的原因，以往的工程做法和相关规范往往采用近似的方法，本文介绍了一种快速求解活荷载不利布置的通用方法。这种通过荷载工况组合的新方法可以得到任意构件在活荷载所有可能布置的设计内力的包络，是一种高效、通用的新方法。这种被称为“Range Add”的荷载组合新方法已经在SAP2000中实现，本文还给出了SAP2000对某钢框架厂房和某无梁楼盖的算例，分析活荷载不利布置在不同阶段对构件设计的影响。
[关键词] 活荷载不利布置；SAP2000；荷载组合

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