- 摘 要
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(1 廣州城投發(fā)展研究院有限公司,廣州 510030； 2 廣州容柏生建筑結構設計事務所 (普通合伙),廣州 510180；3 廣州新中軸建設有限公司,廣州 510623)
摘要: 室內鋼結構加固改造由于受制于加固順序、施工條件、安裝方式及起重設備的性能等，較外部結構及室外結構的加固改造，具有桿件安裝分段更小、數量更多、現場焊接量更大的特點。廣州越秀展覽中心改造工程中，節(jié)點結構功能發(fā)生改變，需在鋼管混凝土柱(CFT)負荷狀態(tài)下對節(jié)點區(qū)進行改造加固。介紹了既有 CFT 柱梁節(jié)點區(qū)域加固改造的技術路線、思路、設計條件。重點闡述 A、B 兩類節(jié)點加固改造設計，其中 A 類節(jié)點為大跨度越層桁架端部的斜桿交匯節(jié)點，B 類節(jié)點為大跨度跨層桁架端部弦桿節(jié)點。從減少現場焊接量、保護原結構、減緩“應力滯后”三個關鍵目標出發(fā)，對加固改造前后的 A、B 節(jié)點進行了應力、損傷等性能分析。最后對節(jié)點的焊接工藝要求進行了介紹。本項目已投入使用，節(jié)點安全，結構運行良好。
關鍵詞: 加固改造； 鋼結構； 大跨度鋼桁架； 鋼管混凝土柱； 柱梁節(jié)點； 焊接殘余應力
中圖分類號:TU398，TU312 文獻標志碼:A 文章編號:1002-848X(2022)19-0138-07
DOI:10.19701 / j.jzjg.LS210271
Reinforcement and reconstruction method for transforming indoor CFT column beamjoints into large-span cross-story truss joints
DENG Zihui1,LI Junsheng2,LIU Runyang3,ZHOU Ding2,XU Zhongren2,CHEN Xiaobing3
(1 Guangzhou City Construction Investment Group Development Research Institute Co. ,Ltd. ,Guangzhou 510030,China；2 RBS Architectural Engineering Design Associate,Guangzhou 510180,China； 3 Guangzhou New MiddleAxis Construction Co. ,Ltd. ,Guangzhou 510623,China)
Abstract: Reinforcement and reconstruction of indoor steel structures are subject to the reinforcement sequence，construction conditions,installation methods and performance of lifting equipment,etc. ,and compared with thereinforcement and reconstruction of the external structure and outdoor structure,it has the characteristics of smallerinstallation sections,more quantity and larger on-site welding volume. In the reconstruction project of Guangzhou YuexiuExhibition Center,the function of the joint structure has changed,and the joint area needs to be reconstructed andstrengthened under the load state of the concrete-filled steel tube (CFT) column. The technical route,ideas and designconditions for the reinforcement and reconstruction of the existing CFT column-beam joint area were introduced. Thereinforcement and reconstruction design of two types joints A and B were mainly expounded,in which type A joint is theintersection joint of inclined rods at the end of large-span cross-story trusses,and type B joint is chord joint at the ends oflarge-span cross-story trusses. Starting from the three key goals of reducing the amount of on-site welding,protecting theoriginal structure,and alleviating the " stress lag" ,the stress,damage and other properties of the type A and B jointsbefore and after reinforcement and reconstruction were analyzed. Finally,the welding process requirements of the jointswere introduced. Now the project is put into use,the joints are safe and the structure is running well.
Keywords:reinforcement and reconstruction； steel structure； large-span steel truss； concrete-filled steel tube column；beam-column joint； welding residual stress
第一作者:鄧梓暉，學士，高級工程師，主要從事結構設計、建設管理等工作，Email:272334165@ qq. com。
[引用本文] 鄧梓暉，李俊聲，劉潤陽，等. 室內 CFT 柱梁節(jié)點改造為大跨度跨層桁架節(jié)點的加固改造方法[ J].建筑結構，2022，52(19):138-144，131. DENG Zihui，LI Junsheng，LIU Runyang，et al. Reinforcement and reconstructionmethod for transforming indoor CFT column beam joints into large-span cross-story truss joints[ J]. Building Structure，2022，52(19):138-144，131.
