（1 哈尔滨工业大学土木工程学院，哈尔滨150090；2 哈尔滨工业大学建筑设计研究院，哈尔滨150090）
［摘要]大连中石油大厦采用斜交网格筒体结构体系，在竖向网格向斜向网格过渡区域采用了混凝土Y型转换节点。为考察节点设计方案的合理性，研究节点的失效过程和极限荷载，进行了4例Y型节点1:5缩尺比例试验，并重点考虑了斜柱补强方式、节点区配箍率的影响。结果表明，数值模拟分析与试验结构及现象基本一致，节点的破坏形式主要表现为斜柱内箍筋崩断、纵筋压弯和混凝土压碎。初步方案采用的Y型节点在保证最小配箍率的条件下节点刚度、强度均能满足设计要求，整体结构转换节点区受力特征符合“强节点、弱构件”的设计原则。
［关键词］Y型节点;斜交网格筒体;极限荷载;静力试验;数值仿真
中图法分类号: TU375 文献标识码: A 文章编号：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
作者简介：曹正罡，博士，副教授，Email:caohit@hit.edu.cn
