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Stress Redistribution of Headed Stud Connectors Subjected to Constant Shear Force
Rong Liu,Zhiqiang Feng,Hengda Ye,Yuqing Liu 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.2
In order to evaluate the stress concentration of stud shear connectors considering creep effect of concrete, finite element analysis of the push-out specimen is carried out. The rate of creep method is used in the solid model to reflect the creep property of concrete. Local bearing stress and splitting stress of concrete are analyzed. The stress concentration of steel beam and stud near the weld toe are obtained. Results show that owing to the creep effect of concrete, the local stresses of the stud are redistributed, even under constant shear force. The stress concentration factor (SCF) of concrete bearing stress in front of the weld collar decreases by about 52%, while the bending deformation of the stud increases due to the stress redistribution given 10 years of creep time. SCF at the weld toe of steel beam increases about 1.5 times of short-term, and SCF of stud shank increases about 3 times. The stress concentration at the root of studs become more obvious under constant shear force due to concrete creep, which is adverse for the long-term behavior of studs in the normal service stage.
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