- 摘 要
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董石麟 陳興剛
（浙江大學空間結(jié)構(gòu)研究中心 杭州 310027）[提要] 鳥巢形國家體育場是2008年北京奧運會的中標方案，其屋蓋主體結(jié)構(gòu)實際上是由兩向不規(guī)則斜交的平面桁架系組成的橢圓平面網(wǎng)架結(jié)構(gòu)，每榀桁架與內(nèi)環(huán)相切或接近相切，不妨稱其為鳥巢形網(wǎng)架。通過研究和分析圓形平面的鳥巢形網(wǎng)架，其結(jié)構(gòu)構(gòu)形可簡化成由統(tǒng)一的一類平面桁架系組成。對于周邊簡支的圓形鳥巢形網(wǎng)架，提出了簡化計算法和相應(yīng)的計算公式，可以方便地計算網(wǎng)架各桿件的內(nèi)力和節(jié)點撓度。對于特定參數(shù)的鳥巢形網(wǎng)架，還給出了內(nèi)力計算用表，以利工程利用。
[關(guān)鍵詞] 鳥巢形 網(wǎng)架 構(gòu)形 平面桁架 受力特性 簡化計算方法The bird-nest-patterned stadium is the successful bid scheme for 2008 0lympic Games in Beijing. The major structure of its roof is an elliptic plane grid structure which consists of several plane trusses irregularly crossed in two directions. Each truss is tangential or tangential approximately to the internal ring. It is thus named as a bird-nest-patterned grid structure.A circular bird-nest-patterned grid structure consisting of some identical plane trusses is first investigated in the aspects of form and load behavior. Then the simplified calculation method for such structures with simple supported boundary condition is proposed. Using the simplified method and derived formula, the internal force of each bar and displacement of each node can be obtained conveniently. The paper also gives out some internal force tables of structures with certain parameters, which can be directly usecl in the designing of this kind of structures.
Keywords: bird-nest-patterned; grid structure; form; load behavior; simplified calculation method
