[1]赵必大、蔡扬政、姚泽阳.KK形圆管相贯节点平面外受弯抗震性能研究[J].郑州大学学报(工学版),2021,42(02):7-12.[doi:10.13705/j.issn.1671-6833.2021.02.012]
　ZHAO Bida,CAI Yangzheng,YAO Zeyang.Study on Seismic Behavior of Unstiffened Circular Hollow Section KK-joints under Out-of-plane Bending[J].Journal of Zhengzhou University (Engineering Science),2021,42(02):7-12.[doi:10.13705/j.issn.1671-6833.2021.02.012]

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KK形圆管相贯节点平面外受弯抗震性能研究()

分享到：

《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:

42

期数:

2021年02期

页码:

7-12

栏目:

出版日期:

2021-04-12

文章信息/Info

Title:

Study on Seismic Behavior of Unstiffened Circular Hollow Section KK-joints under Out-of-plane Bending

作者:

赵必大、蔡扬政、姚泽阳

浙江工业大学土木工程学院;

Author(s):

ZHAO Bida;  CAI Yangzheng;  YAO Zeyang

School of Civil Engineering, Zhejiang University of Technology;

关键词:

KK形圆钢管相贯节点; X形圆钢管相贯节点; 平面外受弯抗震性能; 延性; 耗能

Keywords:

unstiffened circular hollow section(CHS) KK-joints;  unstiffened CHS X-joints;  out-of-plane flexural seismic behavior;  ductility;  energy dissipation

DOI:

10.13705/j.issn.1671-6833.2021.02.012

文献标志码:

A

摘要:

平面KK形圆钢管相贯节点和X形圆钢管相贯节点是单层扁平钢管网壳结构常用的两种节点形式。为了研究KK形圆钢管相贯节点的平面外受弯抗震性能，对KK形节点进行了平面外往复弯矩加载试验，并将KK形节点的试验结果与已有钢管相同的X形节点的试验结果进行对比分析，考察两类节点的平面外受弯性能的差异。试验结果表明：KK形圆钢管节点的破坏模式为主管管壁塑性开裂，开裂后承载力下降缓慢，节点主要依靠主管管壁塑性发展和开裂后的裂纹扩散来耗能，节点的延性系数超过6，表现出良好的抗震性能和变形能力。与X形节点的对比表明：相邻支管相互作用的特点使得KK形节点在一根支管处的平面外抗弯承载力比相应的X形节点低了约23%，但接近EC3规范关于X形节点平面外抗弯承载力公式计算值。此外，受力机理分析和有限元分析表明：在平面外弯矩作用下，KK节点的核心区的受力方式类似四角承受拉力作用，而X形节点的核心区则为两个对角方向拉力作用，故KK节点的塑性发展比X形节点更加均匀、且覆盖面更加广泛；两个节点的试验结果对比也表明：KK节点的耗能能力、变形能力以及延性均比X形节点更强。

Abstract:

To study the out-of-plane bending seismic behavior of Unstiffened circular hollow section (CHS) KK-joints, an out-of-plane bending cyclic loading test was performed. Moreover, the test results of the KK-joints were compared with the existing test results of the corresponding X-joints (with same tubular dimension and material of the KK-joints), to investigate the seismic performance difference between the KK-joints and the X-joints. Additionally, the performance difference was further interpreted by the load-carrying mechanism analysis. The results showed that the failure mode of the KK-joints was chord wall crack after plasticizing, and the resistance decreases slowly after cracking. The energy dissipated of the KK-joints mainly relied on plastic deformation and crack propagation of the chord wall. The ductility ratio of the KK-joints was large than 6, which demonstrated excellent deformability and seismic behavior. It also found that the stress characteristics of the adjacent brace interaction made the out-of-plane flexural strength of KK-joints about 23% lower than that of the corresponding X-joints, but close to the value calculated by the predict equation of CHS X-joints of the EC3 specification. Moreover, the results of load-carrying mechanism analysis and FE analysis showed that the joint-zone of the KK-joints and the X-joints were subjected to tension in the four corners and in two diagonal directions respectively. Therefore, the KK-joints would develop more uniform and extensive plastic at joint-zone than that of X-joints. The comparison of test results between the two type joints also showed that the deformability, ductility, and energy dissipation of the KK-joints were also better than that of the corresponding X-joints.

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