|Table of Contents|

Anti-progressive Collapse Mechanism and Parameter Analysis of Circular CFST Column and Steel Bar Truss Composite Beam Joint(PDF)

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

Issue:
2022年03期
Page:
84-91
Research Field:
Publishing date:

Info

Title:
Anti-progressive Collapse Mechanism and Parameter Analysis of Circular CFST Column and Steel Bar Truss Composite Beam Joint
Author(s):
WANG Jing-xuan;  LI Qiu-ying;  WANG Wen-qi
(School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China)
Keywords:
concrete-filled steel tube;  steel bar truss composite slab;  progressive collapse;  mechanism analysis;  parameter analysis
PACS:
TU398.9
DOI:
10.19815/j.jace.2021.05040
Abstract:
In order to study the influence of steel truss composite beam on the progressive collapse resistance of concrete-filled steel tubular(CFST)structure, ABAQUS was used to establish the numerical model of the joint of CFST column and steel bar truss composite beam. The failure mechanism and resistance calculation curve of the joint under the failure condition of middle column were analyzed, and the influences of main parameters such as the height of steel truss, concrete strength and steel strength on the progressive collapse resistance of composite joint were analyzed. The results show that compared with CFST column-RC composite beam joints, the peak bearing capacities of beam mechanism and catenary mechanism of reinforced truss composite beam joints increase by 12.5% and 10%, respectively. Since the steel bar truss can still provide tension after the yield of the lower chord steel bar, the bearing capacity of the lower flange of the steel beam can continue improving after the fracture, showing good progressive collapse resistance. The height of steel truss and the strength of steel truss mainly improve the peak bearing capacity and ultimate bearing capacity of joint beam mechanism, but have little effect on the peak bearing capacity of catenary mechanism. The strength of floor slab concrete has little effect on the bearing capacity of each stage of joint, and can reduce the ductility of joint. By comparing and analyzing the resistance index and displacement ductility index of joints under different parameters, it is found that the increases of height and strength of steel truss have beneficial effects on the ultimate bearing capacity of joints, which should be considered in engineering design and application.

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Last Update: 2022-05-30