（1 哈爾濱工業(yè)大學土木工程學院，哈爾濱150090；2 哈爾濱工業(yè)大學建筑設計研究院，哈爾濱150090）
［摘要]大連中石油大廈采用斜交網格筒體結構體系，在豎向網格向斜向網格過渡區(qū)域采用了混凝土Y型轉換節(jié)點。為考察節(jié)點設計方案的合理性，研究節(jié)點的失效過程和極限荷載，進行了4例Y型節(jié)點1:5縮尺比例試驗，并重點考慮了斜柱補強方式、節(jié)點區(qū)配箍率的影響。結果表明，數值模擬分析與試驗結構及現象基本一致，節(jié)點的破壞形式主要表現為斜柱內箍筋崩斷、縱筋壓彎和混凝土壓碎。初步方案采用的Y型節(jié)點在保證最小配箍率的條件下節(jié)點剛度、強度均能滿足設計要求，整體結構轉換節(jié)點區(qū)受力特征符合“強節(jié)點、弱構件”的設計原則。
［關鍵詞］Y型節(jié)點;斜交網格筒體;極限荷載;靜力試驗;數值仿真
中圖法分類號: TU375 文獻標識碼: A 文章編號：1002-848X(2013)S1-0456-06
Static experimental study on the Y-shaped concrete transforming joints in diagrid tube structures
CAO Zhenggang1,2，WU Yue1,2，ZHOU wei1，LIU Zhiwei2，Zhang Xiaodong2
（1 School of Civil Engineering，Harbin Institute of Technology，Harbin 150090，China; 2 Architectural Design and Research Institute，Harbin Institute of Technology，Harbin 150090，China）
Abstract: The diagrid tube structure was applied in the China petroleum building in Dalian and Y-shaped concrete transforming joints were utilized in the transition zone between vertical grids and oblique grids. To study the design rationality, failure modes and ultimate strength of the joints, four 1:5 scale Y-shaped transforming joint specimens were tested. The effects of the reinforcing method of oblique columns and the stirrup ratio of the joints were taken into consideration. The experimental results indicate that: the experimental results are almost corresponding to the numerical simulation results, and the most common failure modes of the specimens are the tensile failures of stirrups, the compressive and flexural failures of longitudinal reinforcements and the crushed failures of concretes in oblique columns; under the premise of satisfying the minimal stirrup ratio, the initial design of the joints can meet the requirement of stiffness and strength; the mechanical behavior of the whole transforming joint region can fulfill the design principle of “stronger joints and weak members”.
Key words: Y-shaped joint; diagrid tube; critical load; static test; numerical simulation
作者簡介：曹正罡，博士，副教授，Email:caohit@hit.edu.cn
