- 摘 要
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（1 中南林業(yè)科技大學土木工程與力學學院， 長沙 410000；2 湖南科技大學土木工程學院， 湘潭 411201）
［摘要］提出鋼管混凝土柱與鋼筋混凝土梁整體連接的新型節(jié)點形式。在鋼管混凝土柱與鋼筋混凝梁連接區(qū)將鋼管斷開，使鋼筋混凝土梁中的縱向鋼筋直接伸入支座節(jié)點，節(jié)點區(qū)梁柱混凝土整體澆筑，方便節(jié)點施工且保證節(jié)點剛度。為了彌補由于鋼管斷開造成的節(jié)點強度不足，對節(jié)點無鋼管區(qū)域采用柱縱筋、環(huán)向密箍和鋼筋網片進行加強。通過對3個節(jié)點試件進行軸心受壓試驗，研究了節(jié)點的受力特性。試驗結果表明，在軸向荷載作用下，加強后的節(jié)點破壞遲于鋼管混凝土柱的破壞，承載能力高于鋼管混凝土柱，而且有一定的延性，證實了這種節(jié)點在軸向加載條件下的可行性，且滿足“強節(jié)點”的抗震設計原則。
［關鍵詞］鋼管混凝土柱; 鋼管非連通; 節(jié)點加強; 軸向加載; 試驗研究
中圖分類號：TU398 文獻標識碼：A 文章編號：1002-848X(2014)16-0055-04
Axial compression experimental study on new CFST column-RC beam joints
Chen Bowang1, Yu Hualong2, Cao Yan2, Tang Chu1, Zou Yanhua1
(1 College of Civil Engineering and Mechanics, Central South University of Forestry and Technology, Changsha 410000, China; 2 College of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China)
Abstract: A new type of concrete-filled steel tube (CFST) column-RC beam joint was presented. In the CFST column-RC beam connecting zone，the steel tube was broken for the stretch of the longitudinal bar of reinforced concrete beams into the joint. The concrete of the column and beam was cast integrally to simplify the construction of joint and strengthen the joint stiffness. To make up the insufficient strength caused by the broken steel tube, longitudinal bars, toroidal dense hoops and steel meshes were used to strengthen the joint zone without the steel tube. Mechanism performance of the joint was studied in the experiments of three joint specimens. The experimental results show that under the axial loading, the failure of the reinforced joint happens after the failure of the concrete-filled steel tube column, and the bearing capacity of the joint is higher than that of the concrete-filled steel tube column. Besides, the joint has certain ductility, the feasibility of the joint under the axial loading is verified, and the joint meets the seismic design principle of strong joint.
Keywords: concrete filled steel tube column; discontinue steel tube; strengthen joint; axial loading; experimental study
*湖南省高等學校科學研究項目（10A017）。
作者簡介：陳伯望，博士，教授，Email:tmcbw@163.com。
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