|Table of Contents|

Study on flexural performance of T-shaped composite beams with defects(PDF)

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

Issue:
2023年04期
Page:
70-79
Research Field:
建筑结构
Publishing date:

Info

Title:
Study on flexural performance of T-shaped composite beams with defects
Author(s):
FENG Qingxing1;  LIN Huangcheng1;  GONG Shunfeng2
(1. School of Civil Engineering and Architecture, Zhejiang University of Science & Technology, Hangzhou 310023, Zhejiang, China; 2. Institute of Structural Engineering, Zhejiang University, Hangzhou 310058, Zhejiang, China)
Keywords:
composite beam;  defect;  flexural performance;  full-scale test;  cohesive model;  parameter analysis;  peak load;  unfavorable position
PACS:
TU375
DOI:
10.19815/j.jace.2021.11105
Abstract:
In order to study the flexural performance of T-shaped composite beam with defects and the effect of defects on flexural performance, considering different defect total length, defect position and cast-in-place thickness, full-scale tests of three T-shaped composite beam with defects and one comparison beam were carried out under monotonic load. The numerical model was established by ABAQUS finite element software to verify the test results. The results show that the bonding performance of the laminated surface is good and there is no obvious slip when the T-shaped composite beam with defect occurs bending failure. The reduction of the bearing capacity of the composite beam specimen is about 3%, which is less affected, but the effect on the ductility is slightly larger. The defects reduce the stiffness of the section, which is easy to cause more secondary cracks at the beam bottom. Within a certain range of the defect total length, the defect has little effect on the flexural bearing capacity. But when the defect total length exceeds certain value, the weakening effect on the peak load will become significant. Changing the defect position will lead to the change of the actual bond resistance, and the influence on the bearing capacity will also change. When the defect is in the position of larger shear force, the effect of the defect on the flexural performance is great. Increasing the cast-in-place thickness within a certain range can enhance the bearing capacity of the composite beam, and the influence of the defect is also reduced. However, after exceeding a certain value, the bearing capacity of the composite beam will be decreased as the cracks developing to the weak layer earlier, and the weakening effect of the defect on the bending resistance of the composite beam will also increase.

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Last Update: 2023-07-01