PSI - Issue 51

Zhihua Xiong et al. / Procedia Structural Integrity 51 (2023) 179–184 Z. Xiong et al. / Structural Integrity Procedia 00 (2022) 000–000

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modified clothoid-shaped (MCL). In practical application, the stress status of composite dowel is complicated, and it usually bears the combination of bending moment and shear force (Kopp et al., 2018). Because of its complicated stress distribution, the fatigue crack problem of composite dowels deserves more attention (Berthellemy 2009, 2013). When CL and PZ dowels bearing the same fatigue load, P. Harnatkiewicz et al. (2011) believed that the fatigue durability of CL-shaped dowels was superior through the verification of finite elements and tests. Markus Feldmann et al. (2016) studied the fatigue behaviors of different components, in their work the fatigue design methods of CL shaped dowels are proposed from three aspects: steel fatigue design, concrete fatigue design and securing a rigid shear joint. This paper considers the contact between concrete and steel beams, conducts finite element analysis on beams with CL-shaped dowels, and simulates the stress of dowels under flexural and shear actions and pure shear loads. The XFEM method is used to simulate and analyze the crack propagation of the beam and the stress intensity factor is used to describe the fatigue phenomenon of the composite dowels. 2. Purpose of this study T-shaped beam and pull-out specimen are used to simulate CL-shaped dowels in composite structures. The finite element models are established for the two loading situations to investigate the fatigue performance of CL-shaped dowels under bending-shear action and the pull-out action respectively. The purpose of the simulation is to explore the crack initiation of CL-shaped dowels under different loads through the stress intensity factor approach. The main workflow is as follows:

Fig. 1. Schematic diagram.

3. Bending-shear model T-shaped beams with composite dowels are established by ABAQUS. The span of all beams is 1.0m. The cross section of T-shaped beams is shown in Fig. 2. In the process of force analysis, ABAQUS standard solver is used to overcome the convergence problem caused by large plastic deformation. The concrete material is C50. Considering the elastic-plastic of steel, with an elastic modulus of 206GPa and a Poisson's ratio of 0.3. In order to simulate the interaction between parts, the contact between the steel beam and concrete is set differently in different directions. It belongs to hard contact in the normal direction, and the friction coefficient is 0.3 in the tangential direction. For the dimensions of the CL-shaped dowel, ex=100mm was selected, with the specifically indicated dimensions defined according to the specification as shown in Fig. 3.