PSI - Issue 42

Maha Assad et al. / Procedia Structural Integrity 42 (2022) 1668–1675 Assad et al./ Structural Integrity Procedia 00 (2019) 000 – 000

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2. Finite Element Model Description The finite element model was created using ANSYS v19.2 (ANSYS, (2019)). Two FE models were developed to conduct thermal/heat transfer and structural/mechanical analysis. The geometry and material properties of the modeled slab are identical to the experimentally tested one in (Azevedo et al., (2022)). The followed methodology of the finite element analysis is to create a thermal model to obtain the nodal temperatures and then apply them to the structural model through a thermo-stress analysis. Nodal temperatures and midspan deflection values were obtained and compared to the results from the previous experimental investigation. To reduce computational time, a quarter of the slab was modeled, and boundary conditions were assigned in the symmetrical planes. Figure 1-a shows the test apparatus, and Fig. 1-b and 1-c show the cross-section of the EB and NSM slabs, respectively. Figure 2-a and 2-b show the constructed slab using the EB and NSM techniques, respectively. Figure 2-c shows the symmetrical conditions assigned to the slab. It should be noted that three slabs were analyzed under ambient temperatures which are the control (unstrengthened) slab, the EB slab, and the NSM slab. This analysis was primarily done for comparison purposes.

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Fig. 1. Geometrical configuration of the tested slab (a) Test apparatus; (b) EBR; (c) NSM

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Fig. 2: Developed FE model for the slab in ANSYS (a) EBR; (b) NSM; (c) Symmetrical conditions