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Experiment on shear behavior of high-strength bolt connectors in steel-SFRC composite beams(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2023年6期
Page:
60-70
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Experiment on shear behavior of high-strength bolt connectors in steel-SFRC composite beams
Author(s):
WANG Wei1; 2;  ZHANG Xie-dong1;  ZHANG Hong-yan3;  CHEN Fu-jun4; BAI Fang-long1;  ZHENG Xin-lei1;  TANG Bin-peng1
(1. School of Transportation and Logistics Engineering, Wuhan University of Technology, Wuhan 430063,Hubei, China; 2. School of Engineering and Technology, University of New South Wales, Canberra 2600,Australia; 3. Phase Ⅱ Branch, Hubei Qiaoxiao Expressway Management Co. Ltd., Wuhan 432020,Hubei, China; 4. Sichuan Transportation Construction Group Co. Ltd., Chengdu 610041, Sichuan, China)
Keywords:
bridge engineering;  high-strength bolt connector;  push-off test;  load-slip curve;  shear bearing capacity;  steel-fiber reinforced concrete
PACS:
U445.58
DOI:
10.19721/j.cnki.1671-8879.2023.06.006
Abstract:
To investigate the shear performance of high-strength bolt connectors with double embedded nuts insteel-steel fiber concrete(SFRC)composite beams, four push-off specimens were designed and fabricated forconducting push-off tests. The effects of high-strength bolt diameter(M12 and M16), bolttensile strength(G8.8 and G10.9), and concrete strength(CF25 and CF30)on failure modes, load-slip responses,load-strain relationships of concrete slabs, shear stiffness, and shear bearing capacity were explored. Based on the test results andexisting design formulas, recommendations for bolt shear capacity were proposed. The resultsshow that boltshear-off is the primary failure mode in all specimens, accompanied by minor spalling of concrete under the bolt.Compared to push-off specimens with normal concrete, the addition of steel fiber effectively restrains theformation and propagation of cracks in concrete slabs, enhancing specimen ductility. The typical load-slip curvecomprises distinct stages are friction overcoming, initial slipping, bolt shank transferring, bolt yielding, and failure.Horizontal slip of the concrete slab ranges from 1.17 to 2.05 mm, representing only 10.8% to 26.0% of thevertical slip of the steel beam-concrete slab during specimen failure. Bolt shear capacity and post-slip shearstiffness increase with larger high-strength bolt diameter, greater bolt tensile strength, and higher concrete strength.The bolt's initial slip load rises with increased bolt preload. Peak slip in push-off specimens with SFRC variesfrom 5 to 12 mm, significantly exceeding the results obtained in push-off tests with normal concrete slabs.Therefore, it is recommended that high-strength bolt diameter in SFRC composite beams should exceed 12 mmfor adequate deformation capacity. The proposed design formula for bolt shear capacity aligns well with testresults, serving as a valuable reference for bolt design in steel-SFRC composite beams.4 tabs, 9 figs, 31 refs.

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Last Update: 2023-10-30