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(1 長(zhǎng)安大學(xué)建工學(xué)院 西安 710061；2 蘇州科技學(xué)院 215011；3 西安建筑科技大學(xué) 710055)
［提要］ 將《鋼結(jié)構(gòu)設(shè)計(jì)規(guī)范》(GB50017—2003)中框架體系支撐條件的區(qū)分引入到錯(cuò)列桁架的穩(wěn)定分析中，考慮初始缺陷的影響，提出了強(qiáng)、弱支撐錯(cuò)列桁架體系的劃分標(biāo)準(zhǔn)，推導(dǎo)出了錯(cuò)列桁架體系柱子平面內(nèi)計(jì)算長(zhǎng)度公式。強(qiáng)支撐體系中柱子計(jì)算長(zhǎng)度可以按照規(guī)范GB50017—2003計(jì)算。對(duì)弱支撐體系，提出了柱子計(jì)算長(zhǎng)度的實(shí)用計(jì)算公式。
［關(guān)鍵詞］ 錯(cuò)列桁架 計(jì)算長(zhǎng)度 鋼結(jié)構(gòu)設(shè)計(jì)
Effective Length of Columns in Staggered Truss Structure/Lu Linfeng1,Gu Qiang2,Su Mingzhou3(1 School of Civil Engineering,Chang'an University, Xi'an 710061,China; 2 University of Science and Technology of Suzhou，Suzhou  215011,China; 3 Xi'an University of Architecture & Technology,Xi'an 710055,China)
Abstract:The provision of frame bracing condition  in the Code for Design of Steel Structures(GB50017—2003) has been led into the stability analysis of staggered truss system.Considering the effect of initial deflection,the  standard to divide strong and weak bracing staggered truss system is  given.The column effective length of strong bracing system can be calculated according to the current design code.For weak bracing system, the  formula of calculating the effective length coefficient is  provided for design of the columns.
Keywords:staggered truss；effective length;steel structure design;stability analysis

*陜西省自然科學(xué)基金資助項(xiàng)目(20013C1)。