Techno Press

Steel and Composite Structures   Volume 18, Number 5, May 2015, pages 1279-1290
Study on uplift performance of stud connector in steel-concrete composite structures
Xiaochen Ju and Zhibin Zeng

Abstract     [Full Text]
    The main role of studs, which act as connectors of the steel-concrete composite structures, is to ensure that the steel and the concrete work together as a whole. The studs in steel-concrete composite structures bear the shearing force in the majority of cases, but in certain locations, such as the mid-span of a simply supported composite beam, the studs bear axial uplift force. The previous studies mainly focused on the shearing performance of the stud by some experimental and theoretical effort. However, rare studies involved the uplift performance of studs. In this paper, the single stud uplift test on 10 composite specimens was performed. Meanwhile, based on the test, numerical analysis was introduced to simulate the concrete damage process due to the stud uplifted from concrete. The static ultimate bearing capacity, under which the stud connector was pulled out from the damaged reinforced concrete, is much larger than the cyclic ultimate bearing capacity, under which the weld joint between stud and steel plate fractured. According to the fatigue test results of 7 specimens, the fatigue S-N curve of the construction detail after minus 2 times standard deviation is logN = 24.011 - 9.171 logΔσ, the fatigue strength corresponding to 2 × 106 cycles is 85.33 MPa.
Key Words
    uplift performance; stud connector; ultimate bearing capacity; fatigue strength
Railway Engineering Research Institute, China Academy of Railway Sciences, No. 2 Daliushu Road, Haidian District, Beijing, 100081, China.

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