Experimental and theoretical studies on reducing hot spot stress on CHS gap K-joints with CFRP strengthening

Lewei Tong; Guowen Xu; Xiao Ling Zhao; Haiming Zhou; Fei Xu

doi:10.1016/j.engstruct.2019.109827

Experimental and theoretical studies on reducing hot spot stress on CHS gap K-joints with CFRP strengthening

Lewei Tong, Guowen Xu, Xiao Ling Zhao, Haiming Zhou, Fei Xu

Research output: Journal article publication › Journal article › Academic research › peer-review

71 Citations (Scopus)

Abstract

This paper presents an experimental investigation into reducing the hot spot stress on gap K-joints made of circular hollow sections (CHS) with carbon fibre reinforced polymer (CFRP) strengthening. A series of well-designed CHS gap K-joints were strengthened by using combinations of unidirectional and bidirectional CFRP sheets. Hot spot stress tests were conducted on the joints before and after strengthening. By comparing stress concentration factors (SCFs), it was found that the proposed CFRP strengthening scheme could effectively reduce the hot spot stress on CHS gap K-joints, thereby prolonging the fatigue life of joints. Generally, the maximum SCFs in the chord and brace decrease by an average of 20% and 15%, respectively. Furthermore, a theoretical analysis was conducted to develop formulas for the SCF reduction coefficient, which were verified by test results. SCF formulas were suggested for CFRP-strengthened CHS gap K-joints.

Original language	English
Article number	109827
Journal	Engineering Structures
Volume	201
DOIs	https://doi.org/10.1016/j.engstruct.2019.109827
Publication status	Published - 15 Dec 2019
Externally published	Yes

Keywords

Carbon fibre reinforced polymer
CFRP strengthening
Circular hollow section gap K-joint
Hot spot stress
Stress concentration factor

ASJC Scopus subject areas

Civil and Structural Engineering

More information

10.1016/j.engstruct.2019.109827

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@article{91e09c392f1349bab04d5f8d30edbea5,

title = "Experimental and theoretical studies on reducing hot spot stress on CHS gap K-joints with CFRP strengthening",

abstract = "This paper presents an experimental investigation into reducing the hot spot stress on gap K-joints made of circular hollow sections (CHS) with carbon fibre reinforced polymer (CFRP) strengthening. A series of well-designed CHS gap K-joints were strengthened by using combinations of unidirectional and bidirectional CFRP sheets. Hot spot stress tests were conducted on the joints before and after strengthening. By comparing stress concentration factors (SCFs), it was found that the proposed CFRP strengthening scheme could effectively reduce the hot spot stress on CHS gap K-joints, thereby prolonging the fatigue life of joints. Generally, the maximum SCFs in the chord and brace decrease by an average of 20\% and 15\%, respectively. Furthermore, a theoretical analysis was conducted to develop formulas for the SCF reduction coefficient, which were verified by test results. SCF formulas were suggested for CFRP-strengthened CHS gap K-joints.",

keywords = "Carbon fibre reinforced polymer, CFRP strengthening, Circular hollow section gap K-joint, Hot spot stress, Stress concentration factor",

author = "Lewei Tong and Guowen Xu and Zhao, \{Xiao Ling\} and Haiming Zhou and Fei Xu",

note = "Funding Information: The authors are grateful for the financial support from Shanghai Civil Engineering Peak Discipline Program of Shanghai Municipal Education Commission (No. 2019010301 ). Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd",

year = "2019",

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doi = "10.1016/j.engstruct.2019.109827",

language = "English",

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T1 - Experimental and theoretical studies on reducing hot spot stress on CHS gap K-joints with CFRP strengthening

AU - Tong, Lewei

AU - Xu, Guowen

AU - Zhao, Xiao Ling

AU - Zhou, Haiming

AU - Xu, Fei

N1 - Funding Information: The authors are grateful for the financial support from Shanghai Civil Engineering Peak Discipline Program of Shanghai Municipal Education Commission (No. 2019010301 ). Publisher Copyright: © 2019 Elsevier Ltd

PY - 2019/12/15

Y1 - 2019/12/15

N2 - This paper presents an experimental investigation into reducing the hot spot stress on gap K-joints made of circular hollow sections (CHS) with carbon fibre reinforced polymer (CFRP) strengthening. A series of well-designed CHS gap K-joints were strengthened by using combinations of unidirectional and bidirectional CFRP sheets. Hot spot stress tests were conducted on the joints before and after strengthening. By comparing stress concentration factors (SCFs), it was found that the proposed CFRP strengthening scheme could effectively reduce the hot spot stress on CHS gap K-joints, thereby prolonging the fatigue life of joints. Generally, the maximum SCFs in the chord and brace decrease by an average of 20% and 15%, respectively. Furthermore, a theoretical analysis was conducted to develop formulas for the SCF reduction coefficient, which were verified by test results. SCF formulas were suggested for CFRP-strengthened CHS gap K-joints.

AB - This paper presents an experimental investigation into reducing the hot spot stress on gap K-joints made of circular hollow sections (CHS) with carbon fibre reinforced polymer (CFRP) strengthening. A series of well-designed CHS gap K-joints were strengthened by using combinations of unidirectional and bidirectional CFRP sheets. Hot spot stress tests were conducted on the joints before and after strengthening. By comparing stress concentration factors (SCFs), it was found that the proposed CFRP strengthening scheme could effectively reduce the hot spot stress on CHS gap K-joints, thereby prolonging the fatigue life of joints. Generally, the maximum SCFs in the chord and brace decrease by an average of 20% and 15%, respectively. Furthermore, a theoretical analysis was conducted to develop formulas for the SCF reduction coefficient, which were verified by test results. SCF formulas were suggested for CFRP-strengthened CHS gap K-joints.

KW - Carbon fibre reinforced polymer

KW - CFRP strengthening

KW - Circular hollow section gap K-joint

KW - Hot spot stress

KW - Stress concentration factor

UR - https://www.scopus.com/pages/publications/85073956695

U2 - 10.1016/j.engstruct.2019.109827

DO - 10.1016/j.engstruct.2019.109827

M3 - Journal article

AN - SCOPUS:85073956695

SN - 0141-0296

VL - 201

JO - Engineering Structures

JF - Engineering Structures

M1 - 109827

ER -

Experimental and theoretical studies on reducing hot spot stress on CHS gap K-joints with CFRP strengthening

Abstract

Keywords

ASJC Scopus subject areas

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