[1] Tan Yingliang, Zhu Bing, Cui Shengai,. Experimental study on the static load performanceof steel-concrete composite external joints after fatigue loading [J]. Journal of Southeast University (English Edition), 2023, 39 (3): 269-276. [doi:10.3969/j.issn.1003-7985.2023.03.007]

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Experimental study on the static load performanceof steel-concrete composite external joints after fatigue loading()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

39

Issue:

2023 3

Page:

269-276

Research Field:

Traffic and Transportation Engineering

Publishing date:

2023-09-20

Info

Title:

Experimental study on the static load performanceof steel-concrete composite external joints after fatigue loading

Author(s):

Tan Yingliang;  Zhu Bing;  Cui Shengai

School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China

Keywords:

steel truss web-concrete composite structure;  composite external joints;  model test;  static load after fatigue;  mechanical performance

PACS:

U24

DOI:

10.3969/j.issn.1003-7985.2023.03.007

Abstract:

To study the effect of fatigue loading on the static performance of the external joint of the steel truss web-concrete composite(STWCC)structure, three joint models were designed and constructed with a scale ratio of 1〓∶3. The failure mode and load-displacement curve of the joint were obtained through static load testing and post-fatigue static load testing. The load-strain curve of the gusset plate was plotted. The changes in mechanical performance indexes, such as the yield load, ultimate load, rigidity, and ductility coefficient of the joint, were comprehensively analyzed. The results showed that the gusset plate was the key load-bearing component of the STWCC joint, and gusset plate failure was the typical failure mode of the external joint. Although fatigue load had a minor impact on the mechanical performance of the joint before yielding, it exerted a remarkable impact post yielding. Compared with the specimen subjected to only static loading, the specimen without fatigue failure exhibited a 4% lower ultimate bearing capacity and a 28% lower ductility coefficient, while the specimen with fatigue failure exhibited a 25% lower ultimate bearing capacity and a 52% lower ductility coefficient. Fatigue cracks induced stress redistribution in the gusset plate and increased the strain in the regions without fatigue cracks. The strain increase rate decreased with increasing distance from the fatigue cracks.

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Memo

Memo:

Biographies: Tan Yingliang(1993—), male, Ph.D. candidate; Zhu Bing(corresponding author), male, doctor, professor, zhubing126@126.com.
Foundation item: The National Natural Science Foundation of China(No. U1834207).
Citation: Tan Yingliang, Zhu Bing, Cui Shengai. Experimental study on the static load performance of steel-concrete composite external joints after fatigue loading[J].Journal of Southeast University(English Edition), 2023, 39(3):269-276.DOI:10.3969/j.issn.1003-7985.2023.03.007.

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