TY - JOUR
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 - http://www.scopus.com/inward/record.url?scp=85073956695&partnerID=8YFLogxK
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 -