Predicting ultimate shear capacities of shear connectors under monotonic and cyclic loadings
Predicting ultimate shear capacities of shear connectors under monotonic and cyclic loadings
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DOI：
10.1016/j.tws.2019.04.002
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发表时间：
2019-08
影响因子：
6.4
通讯作者：
B. Lu;C. Zhai;Shuang Li;W. Wen
中科院分区：
文献类型：
--
作者：
B. Lu;C. Zhai;Shuang Li;W. Wen
For steel‒plate concrete composite structures, shear connectors, including studs and tie-bars, are critical in resistance of interfacial shear between steel plate and concrete core. The previous push-out experimental results indicated that the primary factor resulting in significant decreases in ultimate shear capacities of shear connectors under cyclic loading was the ultra‒low cycle fatigue fracture of welded joint between shear connector and steel flange in push-out specimen. In this paper, the finite element models of push-out specimens carried out by the authors and a new simplified fracture criterion based on Xue-Wierzbicki fracture criterion were developed for predicting the ultimate shear capacities of shear connectors under monotonic and cyclic loadings. The numerical simulation results validated the developed finite element models, compared with the experimental results. Meanwhile, the parameters in the new simplified fracture criterions for studs and tie-bars were calibrated through the push-out experimental results, respectively. Finally, the ultimate shear capacities of studs and tie-bars at different level of axial tension under monotonic and cyclic loadings were predicted based on the calibrated fracture criterions and the developed finite element models. It indicated that the decreasing ratios of ultimate shear capacities of tie-bars under monotonic and cyclic loadings were less than those of studs at the same ratio of axial tension to specified tension capacity of shear connector. In cyclic loading condition, the decreasing ratios of ultimate shear capacities of studs were almost equal to the corresponding ratios of axial tensions to specified tension capacities.
