一種新型后張拉整體成形穹頂?shù)某尚卧囼炑芯?
劉立杰 郝際平 陳東兆 張 寧
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（西安建筑科技大學西建大萊鋼鋼結(jié)構(gòu)研發(fā)中心710055）
[提要]單弦桿平板網(wǎng)架由于無下弦桿，因而具有平面外抗彎剛度較低的特點。利用此特點，在網(wǎng)架局部下弦節(jié)點間設置帶預留縫隙的張拉下弦桿，通過后張拉下弦桿內(nèi)的張拉鋼絲，平板網(wǎng)架可以較容易地張拉變形為具有多種外觀形狀的空間曲面結(jié)構(gòu)，如：桶拱、穹頂、馬鞍拱。這種網(wǎng)殼成形方法不需要傳統(tǒng)空間網(wǎng)殼拼裝過程中所需的腳手架及重型吊車，因而降低了施工造價，工程應用價值很好。在前人研究的基礎(chǔ)上，提出了一種新型的后張拉整體成形穹頂?shù)膯蜗覘U平板網(wǎng)架模型，成形試驗研究證明了它的合理性和可行性。[關(guān)鍵詞]單弦桿平板網(wǎng)架 后張拉 穹項 桶拱 馬鞍拱Abstract:The single-chorded plane space truss have the low flexural rigidity out of plane because of lacking bottom chord. Using this feature, the single-chorded plane space truss which have the bottom tensioning-chord can easily form into curved space trusses with zero, positive, or negative Gaussian curvature, for example vault, dome, hyper, by means of tensioning wire which lie in the bottom chord. This novel post-tensioning method eliminates the need to use scaffolding or heavy cranes for construction, so it reduces the cost of construction and have the well application value. This paper advances a new single-chorded plane space truss mode which can form dome by means of post-tensioning on the base of predecessors study, though the test study, the validity is proved.Keywords: single-chorded place space truss; post-tensioning; dome; barrel vault; hyper
