Issue 33

R. Sepe et alii, Frattura ed Integrità Strutturale, 33 (2015) 451-462; DOI: 10.3221/IGF-ESIS.33.50 454 F INITE ELEMENT MODEL OF THE ROOF OF THE FREIGHT REFRIGERATED CAR he structure of the roof is shown in Fig. 2. The roof is composed of five identical modules connected to the upper longitudinal members of the structure of the wagon. Each module has five ribs, connected by longitudinal elements, which support PCM pipes. The module is joined to the side members by means of elements which allow free deformations of the structure of the module in the transversal direction. Figure 2 : Structure of the roof of the freight car. Description of the structure of the roof A single module is shown in Fig. 2. The principal frame of the roof module consist of "C" or "double T" sections, in both transverse and longitudinal direction (Fig. 3), there are also reinforcing plates between pairs of facing bars (Fig. 4); the structure is moreover covered by sheets and supports the pipes containing the PCM (Fig. 5). Figure 3 : Principal frame of the roof module. Figure 4 : Reinforcing plates. T