Static Strength of Friction-Type High-Strength Bolted T-Stub Connections under Shear and Compression

Autor: Wang Youzhi, Yefeng Du, Zhao Wenshuai, Laiyong Wang, Xu Gangnian
Rok vydání: 2020
Předmět:
ultimate strength
Ultimate load
Materials science
initial friction load
Diagonal
020101 civil engineering
02 engineering and technology
lcsh:Technology
0201 civil engineering
law.invention
lcsh:Chemistry
Prestressed concrete
0203 mechanical engineering
law
Ultimate tensile strength
General Materials Science
lcsh:QH301-705.5
shear and compression
Instrumentation
Fluid Flow and Transfer Processes
lcsh:T
finite element method (FEM)
business.industry
Process Chemistry and Technology
General Engineering
Box girder
Structural engineering
lcsh:QC1-999
Clamping
Bracing
Computer Science Applications
T-stub connection
020303 mechanical engineering & transports
lcsh:Biology (General)
lcsh:QD1-999
Shear (geology)
lcsh:TA1-2040
lcsh:Engineering (General). Civil engineering (General)
business
high-strength bolted (HSB) connection
lcsh:Physics
Zdroj: Applied Sciences
Volume 10
Issue 10
Applied Sciences, Vol 10, Iss 3600, p 3600 (2020)
ISSN: 2076-3417
DOI: 10.3390/app10103600
Popis: The friction-type high-strength bolted (FHSB) T-stub connection has been widely used in steel structures, due to their good fatigue resistance and ease of installation. While the current studies on FHSB T-stub connections mainly focus on the structural behaviors under both shear and tensile force, no research has been reported on the mechanical responses of the connections under the combined effects of shear and compression. To make up for this gap, this paper presents a novel FHSB T-stub connection, which is simple in structure, definite in load condition, and easy to construct. Static load tests were carried out on 21 specimens under different shear&ndash
compression ratios, and the finite-element (FE) models were created for each specimen. The failure modes, initial friction loads and ultimate strengths of the specimens were compared in details. Then, 144 FE models were adopted to analyze the effects of the friction coefficient, shear&ndash
compression ratio, bolt diameter and clamping force on the initial friction load and ultimate strength. The results showed that the FHSB T-stub connection under shear and compression mainly suffers from bolt shearing failure. The load&ndash
displacement curve generally covers the elastic, yield, hardening and failure stage. If the shear&ndash
compression ratio is small and the friction coefficient is large, its curve only contains the elastic and failure stage. The friction coefficient and shear&ndash
compression ratio have great impacts on the initial friction load and ultimate strength. For every 1 mm increase in bolt diameter, the initial friction load increased by about 10%, while the ultimate strength increased by about 8.5%. For each 10% increase/decrease of the design clamping force, the initial friction load decreases/increases by 7.8%, while the ultimate load remains basically the same. The proposed formula of shear capacity and self-lock angles of FHSB T-stub connection can be applied to the design of CSS-enhanced prestressed concrete continuous box girder bridges (PSC-CBGBs) and diagonal bracing.
Databáze: OpenAIRE
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