- 摘 要
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（華南理工大學建筑設計研究院， 廣州 510641）
［摘要］廣深鐵路石龍站站房下方有地鐵R2線穿過，站房主體結構通過三根大跨度預應力RC轉(zhuǎn)換梁跨越地鐵R2線，轉(zhuǎn)換梁為2.5m高的T形截面梁和2.8m高的箱形截面梁。詳細分析了施工全過程中轉(zhuǎn)換梁的內(nèi)力，并根據(jù)其內(nèi)力變化分階段對轉(zhuǎn)換梁施加預應力。簡述了轉(zhuǎn)換梁的截面設計，包括預應力筋的布線、非預應力鋼筋設置及裂縫控制。分析結果表明，對于剛度較小的大跨度轉(zhuǎn)換梁，采用分階段張拉預應力可以明顯改善整個轉(zhuǎn)換結構體系的受力性能。
［關鍵詞］預應力RC結構; 大跨度; 轉(zhuǎn)換梁; 施工模擬
中圖分類號：TU378 文獻標識碼：A 文章編號：1002-848X(2014)15-0041-04
Design of the large-span transfer beam across subway of Shilong Railway Station building of Guangzhou-Shenzhen Railway
Lei Wenjun
(Architecture Design and Research Institute, South China University of Technology, Guangzhou 510641, China)
Abstract: The subway line R2 underground crosses Shilong Railway Station building of Guangzhou-Shenzhen Railway. The main structure of the station building crosses subway line R2 by three large-span prestressed RC transfer beams, and the transfer beams are T-shaped beams with 2.5 meters high and box girder with 2.8 meters high. The internal forces of the transfer beams during the whole construction process were analyzed. The prestressed forces were applied on the transfer beams in stages based on the internal force changes during the construction process. The section design of the transfer beams was introduced, including prestressed reinforcement layout, non-prestressed reinforcement placement and the cracking control. The analysis results show that the staged tensioning prestressed method is fit for the large-span transfer beam with small stiffness and can greatly improve the mechanical performance of the whole transfer structure.
Keywords: prestressed reinforced concrete structure; large-span; transfer beam; construction simulation
作者簡介：雷文軍，博士，工程師，一級注冊結構工程師，注冊土木工程師（巖土），Email:jackmanlei@163.com。
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