Abstract
The headed stud connectors are widely used in a variety of innovative engineering applications of the infrastructure sector. The fatigue life of headed studs is significantly affected by the residual stress introduced from welding procedures. It is very important to develop a reliable numerical method to predict the fatigue performance of headed stud connectors. In this paper, the efficiency of fatigue life prediction, using the nominal stress (NS) and the hot spot stress (HSS) methods based on finite element simulation, is compared. The limitation using the NS method to predict the fatigue life of studs is discussed in this paper. The efficiency of the HSS analysis technique is validated by the fatigue test results in the literature.
Highlights
Headed stud shear connectors [38] are typically applied at the steel–concrete interface of composite beams to connect steel girders and the concrete slabs
The limitation using the nominal stress (NS) method to predict the fatigue life of studs is discussed in this paper
The efficiency of the hot spot stress (HSS) analysis technique is validated by the fatigue test results in the literature
Summary
Headed stud shear connectors [38] are typically applied at the steel–concrete interface of composite beams to connect steel girders and the concrete slabs. The heataffected zone (HAZ), as shown, between the studs and base plates will reduce the fatigue life due to coexisting intrinsic defaults, such as micro-crystal dislocation, the meso-scope notch and the remarkable residual stress [14]. Type B is due to insufficient welding quality, leading to local stress concentration and increased initial micro-cracks, so the stiffness of the interface between the stud and weld toe is low that the weld toe is torn under fatigue load. Under the action of fatigue load, the steel plate crack at the weld toe propagates along the plate thickness direction and causes Type C failure [26][27]. The toe-plate crack is one of the probable fatigue damages in SPJ (http://creativecommons.org/licenses/by/4.0/)
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