Experimental Study on Shear Resistance of Abnormal Internal Joints in Partially-Encased Concrete Column-Steel Beam Frame

LI Bushuan; ZHOU Wei; ZHAO Chong; LU Yao; ZHAO Gentian; CHEN Ming

doi:10.3969/j.issn.0258-2724.20210545

Volume 58 Issue 3

Jun. 2023

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Journal of Southwest Jiaotong University > 2023 > 58(3): 563-574.

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Citation:

LI Bushuan, ZHOU Wei, ZHAO Chong, LU Yao, ZHAO Gentian, CHEN Ming. Experimental Study on Shear Resistance of Abnormal Internal Joints in Partially-Encased Concrete Column-Steel Beam Frame[J]. Journal of Southwest Jiaotong University, 2023, 58(3): 563-574. doi: 10.3969/j.issn.0258-2724.20210545

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Experimental Study on Shear Resistance of Abnormal Internal Joints in Partially-Encased Concrete Column-Steel Beam Frame

doi: 10.3969/j.issn.0258-2724.20210545

LI Bushuan^{1, 2
,},
ZHOU Wei¹,
ZHAO Chong¹,
LU Yao¹,
ZHAO Gentian^{1, 2
,
,},
CHEN Ming¹

1.
School of Civil Engineering, Inner Mongolia University of Science & Technology, Baotou 014010, China
2.
Key Laboratory of Safety and Durability for Civil Engineering, Inner Mongolia University of Science & Technology, Baotou 014010, China

Received Date: 04 Jul 2021
Rev Recd Date: 19 Nov 2021

Available Online: 22 Feb 2023

Publish Date: 05 Dec 2021

Abstract

Abstract

Due to the requirements for the appearance of civil buildings and the production process of industrial buildings, abnormal internal joints may be formed in the partially-encased steel-concrete composite structures due to misalignment and change of beams and columns. In order to investigate the shear resistance of this type of abnormal internal joints, low circumferential reciprocal load tests were conducted on one conventional internal joint and three profiled internal joints with 1∶2 scale-down model specimens. The damage morphology, hysteretic energy dissipation, load bearing capacity, and ductility properties of the internal joints were analyzed using the height of the beam dislocation on both sides of the column and the height of the single side beam section as variable parameters. The experimental results show that the hysteresis curves of all specimens present a symmetrical and full shuttle shape. The equivalent viscous damping coefficient is between 0.598 and 0.618 and the displacement ductility coefficient is between 3.28 and 4.96, showing good performance in energy dissipation and deformation. Compared to the conventional internal joint, the load bearing capacity of the three profiled internal joints formed due to misalignment and variable beams is increased by 6.1%, 14.0% and 15.0%, respectively, and their displacement ductility factor is increased by approximately −26.6%, 11.0% and −14.1%, respectively, with insignificant ductility performance patterns and little change in energy dissipation capacity, strength and stiffness degradation. For class Ⅰ heterogeneous internal joints with the same cross-sectional dimensions of the left and right beams but completely staggered (i.e., the dislocation height greater than the beam height), they can be designed according to T-shaped edge joints. Based on the joint domain force transfer mechanism, a shear calculation model for class Ⅱ heterogeneous internal joints was established, a formula for calculating the shear bearing capacity was proposed, and the test results agreed well with the theoretical calculation results.
- split-level,
- varying depth beam,
- partially encased concrete (PEC) column,
- profiled interior joint,
- low-cyclic reversed loading test,
- shear resistance performance

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References(21)

References

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