- 摘 要
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（1 中冶京誠工程技術(shù)有限公司， 北京 100176； 2 北京京誠華宇建筑設(shè)計研究院有限公司， 北京 100070； 3 梅溪湖投資（長沙）有限公司， 長沙 410205）
［摘要］長沙梅嶺公園跨龍王港河步行橋形同中國結(jié)，主體結(jié)構(gòu)采用隨橋形同步變化的鋼結(jié)構(gòu)桁架體系，結(jié)構(gòu)受力主次分明，傳力明確。介紹了穿插交錯處設(shè)置水平通道的結(jié)構(gòu)實(shí)現(xiàn)方式、半穿式橋梁桁架結(jié)構(gòu)上弦桿平面外計算長度的計算方法及步行橋施工安裝順序。針對此結(jié)構(gòu)體系，進(jìn)行了模態(tài)分析、彈性屈曲分析和施工階段分析。結(jié)果表明，在主次橋體間采取增加上下拉結(jié)桿件，能加強(qiáng)整體結(jié)構(gòu)豎向振動特性和增大豎向剛度，本結(jié)構(gòu)整體穩(wěn)定性能和施工安裝順序均能滿足設(shè)計要求。
［關(guān)鍵詞］步行橋； 中國結(jié)； 半穿式鋼桁架結(jié)構(gòu)； 計算長度； 施工安裝順序
中圖分類號：TU393-3文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2017)07-0033-05
Structural design of Meiling Park Footbridge across Longwanggang River in Changsha
Yu Wenhua1,2， Lu Lijie1,2， Tan Jinpeng1,2， Yu Haiqun1,2， Zhang Huashuai3
（1 MCC Capital Engineering & Research Incorporation Ltd., Beijing 100176, China；
2 CERI Architects & Engineers Co., Ltd., Beijing 100070, China；
3 Meixihu Investment (Changsha) Co., Ltd., Changsha 410205, China）
Abstract:The Meiling Park Footbridge across Longwanggang River in Changsha looks like the Chinese knot in shape. The steel structure truss system is applied as its main structure and the truss shape is changed along with the bridge shape. The structure is under actions of clear primary and secondary forces, and force transfer way is clear. The structural design of the horizontal channel set in intercrossed and overlapped parts was introduced. The calculation method of the out-of-plane effective length of top chords of half-worn typed steel truss structure was introduced. The construction installation sequence of the footbridge was described. The modal analysis, elastic buckling analysis and construction stage analysis were used to design the structural system. The analysis results show that adding some upper and lower pulling members between the primary and secondary bridges can improve the overall vertical vibration characteristics and increase the vertical stiffness of the footbridge. The overall stability and the construction installation sequence of the structure can meet the design requirements.
Keywords:footbridge; Chinese knot; half-worn typed steel truss structure; effective length; construction installation sequence
作者簡介：余文華，碩士，工程師，Email：yuwenhua@ceri.com.cn。
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