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范  重    王春光    董  京
（中國(guó)建筑設(shè)計(jì)研究院  北京 100044）

[提要]  寧波國(guó)際會(huì)展中心的小展廳和東、西展廳大跨度屋蓋采用了主、次空間管桁架結(jié)構(gòu)體系，鋼管之間直接相貫焊接。在展廳中部設(shè)置了四肢鋼管組合柱，從而有效地減小了屋蓋的跨度與高度，使屋蓋的用鋼量大大減小。為了適應(yīng)大跨度屋面溫度變形的要求，采用了滑板式聚四氟乙烯橡膠支座。
[關(guān)鍵詞]  大跨度結(jié)構(gòu)  空間管桁架  鋼管組合柱  滑板式橡膠支座

The spatial trusses using hollow section steel are introduced at the roof structures of small hall, eastern hall, and west hall in Ningbo International Conference&Exhibition Center. The trapezoid and triangle cross-sections are used for the main trusses and sub-trusses respectively, and the members of circular HSS are welded together directly at connections. Built-up columns that consist of four-steel pipes, batten beams and diagonal cable bracings are arranged at the interior of the exhibition halls to reduce span of the roof structures so that it can have much lower material cost compared to without interior columns.To satisfy thermal deformation of the large-span roof, the bearings that consist of rubber-bonded-to-metal pads and teflon-sliders are applied properly.
Keywords: large span structure; hollow structural section truss; built-up column; teflon-slider bearing