|Table of Contents|

Experimental study on collapse resistance of prefabricated concrete-filled steel tubular joints(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2025年06期
Page:
68-76
Research Field:
建筑结构
Publishing date:

Info

Title:
Experimental study on collapse resistance of prefabricated concrete-filled steel tubular joints
Author(s):
RONG Xian1; 2;  PENG Hexiang1;  SHI Xiaona1; 3;  LI Yanyan1; 2
(1.School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China; 2. Civil Engineering Technology Innovation Center of Hebei Province, Hebei University of Technology, Tianjin 300401, China; 3. Zhongtu Dadi International Architectural Design Co., Ltd., Shijiazhuang 050035, Hebei, China)
Keywords:
concrete-filled steel tubular joint;  collapse resistance;  quasi-static load test;  catenary mechanism;  equivalent dynamic analysis
PACS:
TU398
DOI:
10.19815/j.jace.2024.07060
Abstract:
In order to study the collapse resistance of concrete-filled steel tubular joints and improve the bearing capacity of prefabricated concrete-filled steel tubular joints under the failure condition of the middle column, the influence of the tensile bending performance and rotation capacity of the joints on the collapse resistance of structure was studied. Two specimens with circular holes and long circular holes were designed for the bolt holes at the joint connection, and the linear quasi-static load test was carried out to explore the stress and strain distribution of the key parts of joint through the test phenomenon. By decomposing the internal force of the joint, the bending mechanism of the joint and the effect of catenary mechanism on the vertical bearing capacity were analyzed. At the same time, the equivalent dynamic analysis of the ductility performance of the joint was carried out. Based on the DoD specification, the calculation formula of the dynamic magnification factor of concrete-filled steel tubular joint was proposed, and its accuracy was discussed. The results show that the beam section far away from the core of the joint is always in an elastic state during the loading process. The steel beam exerts its bending resistance to resist the load before the joint produces large displacement, and exerts the catenary effect to resist the load after the joint produces large displacement. The joints with long circular holes in the bolt holes at the connection can give full play to the catenary effect by weakening some of the bending resistance, and improve the ductility, rotation capacity and bearing capacity of the joints. The stress distribution is uniform during the test loading process, which is not easy to produce stress concentration failure. The calculation formula of dynamic amplification factor can better predict the dynamic effect of node catenary stage, and is more in line with the development trend of ductility of concrete-filled steel tubular structures under progressive collapse conditions.

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Last Update: 2025-11-25