|Table of Contents|

Analysis of influence of opening shape on mechanical performance of steel-concrete composite beams with web openings(PDF)

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

Issue:
2023年03期
Page:
61-69
Research Field:
建筑结构
Publishing date:

Info

Title:
Analysis of influence of opening shape on mechanical performance of steel-concrete composite beams with web openings
Author(s):
JIANG Wei;  LIAO Wenyuan;  LIU Dewen;  CHEN Jing;  XIE Xin
(College of Civil Engineering, Southwest Forestry University, Kunming 655024, Yunnan, China)
Keywords:
composite beam;  web opening;  opening shape;  mechanical performance
PACS:
TU398.9
DOI:
10.19815/j.jace.2022.01075
Abstract:
By studying the influence of opening shape on the stress of steel-concrete composite beams with web openings, selecting an appropriate opening shape to reduce the adverse effects caused by opening. Based on existing experiments, ANSYS was used to analyze the mechanical performance of composite beams with different shapes of openings in the bending shear section. The influence of opening shape on bearing capacity, deformation capacity, internal force redistribution, and force transmission mechanism was studied. The results show that web opening of steel concrete composite beams can lead to a decrease in stiffness and ultimate bearing capacity. The ultimate deformation of composite beams with non square openings is enhanced to varying degrees due to different shapes of openings. Shapes of openings will affect the proportion of shear force borne by concrete and steel beams at the opening. Concrete accounts for 46%-59% of the total shear force, while steel beams account for 41%-54% of the total shear force. The ultimate deformation is related to the area of the plastic hinge at the opening. Studs will exert a certain pre-pressure on the surrounding concrete and have an impact on the redistribution of stress in the concrete. There is a significant difference in shear force in the concrete at the entrance, and the shear force borne by the steel beam below the entrance is greater than that of the steel beam above the entrance. The shape of the opening will affect the internal force transfer mechanism of the composite beam. The rectangular and square opening specimens transmit force through secondary bending moment in the opening area, while the non rectangular and square opening specimens transmit force through primary bending moment in the opening area. In structural design, consideration should be given to the eccentricity of the opening position and the angle between the direction of the main stress and the edge of the opening.

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Last Update: 2023-05-20