REDUCED STIFFNESS METHOD OF PREFABRICATED COMPOSITE BEAM CONSIDERING EFFECT OF CLUSTERING DEGREE

LUO Cheng; FAN Liang; QING Yu

doi:10.13204/j.gyjzg20100907

Volume 51 Issue 10

Feb. 2022

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LUO Cheng, FAN Liang, QING Yu. REDUCED STIFFNESS METHOD OF PREFABRICATED COMPOSITE BEAM CONSIDERING EFFECT OF CLUSTERING DEGREE[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(10): 127-133. doi: 10.13204/j.gyjzg20100907

Citation:

LUO Cheng, FAN Liang, QING Yu. REDUCED STIFFNESS METHOD OF PREFABRICATED COMPOSITE BEAM CONSIDERING EFFECT OF CLUSTERING DEGREE[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(10): 127-133. doi: 10.13204/j.gyjzg20100907

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REDUCED STIFFNESS METHOD OF PREFABRICATED COMPOSITE BEAM CONSIDERING EFFECT OF CLUSTERING DEGREE

doi: 10.13204/j.gyjzg20100907

LUO Cheng¹,
FAN Liang^{2
,
,},
QING Yu¹

1. School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China;
2. State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074, China

Received Date: 2020-10-09
Available Online: 2022-02-21

Abstract

Abstract

In order to study the effect of the clustering degree of shear connector (defined as the ratio of the number of shear connectors in the reserved holes of a single section to the total number of shear connectors in the whole beam) on the stiffness of the prefabricated composite beam when the shear connectors are arranged in clusters, the static loading experiments of one cast-in-place composite beam and 2 pieces of assembled composite beams with different bundling degrees were carried out to test the section strain distribution, interface slippage and mid-span deflection, and the change laws of the section stiffness and deflection were also analyzed. Based on continuous gradient assumed that the stifiness of the section without shear connection and the principle of equal area of the section without shear connection before and after equivalence, the stiffness equivalent simplified method was proposed, the principle of equivalent flexural stiffness of the section without shear connection was derived. Combining with the elastic theory, the formula of elastic bending stiffness reduction factor η of prefabricated composite beams was built.By considering the effects of clustering degree, the calculation method for the η of prefabricated composite beams was obtained and applied to the mid-span deflection equation of prefabricated composite beam with different loads. The calculated values of the formula were in good agreement with the actual test values. The minimum deviation was 0.4%, and the maximum deviation was 14.8%. It showed that the calculation formula in this paper had good accuracy and it couls be used to analyze the effects of clustering degree on the stiffness of prefabricated composite beam with this type of cluster key group.
- bridge engineering,
- prefabricated composite beam,
- bending stiffness,
- clustering degree,
- reduction factor,
- mid-span deflection

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References(21)

References

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