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(1 中國(guó)建筑設(shè)計(jì)研究院 北京 100044)
(2 清華大學(xué) 北京 100084)
【提要】 國(guó)家體育場(chǎng)屋蓋肩部次結(jié)構(gòu)扭曲構(gòu)件以受彎為主，構(gòu)件壁厚很薄，板件容易發(fā)生局部屈曲。對(duì)扭曲構(gòu)件受力機(jī)理進(jìn)行了深入的研究，提出設(shè)置內(nèi)部加勁肋的方式提高箱形扭曲構(gòu)件的抗彎剛度，減小板件的面外變形。通過(guò)調(diào)整加勁肋間距，使扭曲構(gòu)件與分段折線箱形構(gòu)件的強(qiáng)度與剛度相等。在確定加勁肋形狀時(shí)，綜合考慮焊接操作空間、節(jié)約材料等因素。設(shè)計(jì)過(guò)程中除進(jìn)行大量有限元計(jì)算分析外，還進(jìn)行了縮尺模型試驗(yàn)，驗(yàn)證設(shè)計(jì)方法的可靠性。
【關(guān)鍵詞】 扭曲構(gòu)件 局部屈曲 受力機(jī)理 有效寬厚比 加勁肋 承載力
Design and Research of Twistcurved Boxsections for Roof Secondary Members of  the National Stadium/Fan Zhong1，Peng Yi1，Wang Zhe1，Qian Jiaru 2，Zhao Zuozhou2(1 China Architecture Design & Research Group,Beijing 100044,China；2 Tsinghua University,Beijing 100084,China)
Abstract:The twistcurved boxsections for the faade secondary members of the National Stadium are mainly subjected to bending moment,since the thickness of the member walls is very thin and local buckling of the plates occurs easily under compression.Based on the study of the behavior of the twistcurved member under bending moment,a design method for twistcurved members is presented.Using inner stiffeners can increase the bending stiffness and reduce the outward deformation of the plates effectively.The strength and stiffness of the twistcurved element can be equal to that of the segmental straightline box section by adjusting the distance between the inner stiffeners.In addition,the welding space and material cost should be considered when determining the shape of stiffeners.During the design procedure,except lager amount of finite element analysis,four scaledspecimen experiments are made to prove the reliability of the design method for twistcurved member.
Keywords:twistcurved boxsection；local buckling；working principle；effective width；stiffener；bearing capacity