- 摘 要
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(1 河海大學水利水電學院,南京 210098; 2 中國建筑西南設計研究院有限公司,成都 610081;
3 東南大學土木工程學院,南京 210096)[摘要] 以常州體育會展中心體育館鋼屋蓋為工程背景,研究了采用環(huán)索張拉方法時,大跨度橢球形索承單層網殼鑄鋼索夾節(jié)點處的預應力損失及其承載能力。選取該結構中最外環(huán)環(huán)索轉角最大處的鑄鋼索夾,對其同步進行了摩擦損失和承載能力研究的足尺模型試驗。試驗結果表明,采用四氟乙烯板加不銹鋼墊層的措施可有效降低鑄鋼索夾節(jié)點處的摩擦損失,能夠保證主動張拉環(huán)索索段和被動張拉環(huán)索索段之間索力的有效傳遞;在整個預應力施加過程中,鑄鋼索夾均處于彈性工作狀態(tài)。因此,對大跨度橢球形索承單層網殼結構,采用科學張拉方法及低摩阻可滑動鑄鋼索夾可實現(xiàn)結構預應力的有效建立。
[關鍵詞] 常州體育館; 索承單層網殼; 可滑動索夾; 低摩阻; 摩擦損失; 承載能力Experimental research on low friction slippery cable clips in the cable-supported
dome of Changzhou Gymnasium
Wang Yongquan1, Feng Yuan2, Guo Zhengxing3, Wang Liwei2, Luo Bin3, Xia Xun2
(1 College of Water Conservancy and Hydropower, Hohai University, Nanjing 210098, China;
2 China Southwest Architectural Design and Research Institute Co., Ltd., Chengdu 610081, China;
3 College of Civil Engineering, Southeast University, Nanjing 210096, China)
Abstract:Taking the steel roof of the gymnasium of Changzhou Sports and Exhibition Center as the engineering background, the loss of prestress and carrying capacity of the cast-steel cable clips were researched when tensioning loop cables were applied on a long-span ellipsoidal cable supported dome. The cast-steel cable clip at the maximum curvature point of the outermost loop cable was selected, and a full-scale model test of the friction loss and carrying capacity was carried out simultaneously. The results indicate that using teflon plate and stainless steel cushion in the cast-steel cable clip can effectively reduce friction loss, which guarantees cable forces of active and passive cable segment, and the cast-steel cable clip is in elastic state under tensioning. The conclusion is that with reasonable design of low friction, slippery cable clips, tensioning loop cables can effectively establish the prestess in a long-span ellipsoidal cable supported dome.
Keywords:Changzhou Gymnasium; cable-supported dome; slippery cable clips; low friction; friction loss; carrying capacity
作者簡介:王永泉,博士,講師,一級注冊結構工程師,Email:wyqseu@126.com。參考文獻
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