Issue 50

F. Jafari et alii, Frattura ed Integrità Strutturale, 50 (2019) 209-230; DOI: 10.3221/IGF-ESIS.50.18 217 Point Points’ number 1 2 3 4 5 6 7 8 Location Concrete layers Steel frame Insulting layers Base points X -0.84 -0.84 +4.2 +4.2 2.73 2.73 +4.2 +4.2 Y 4.2 -4.2 +4.2 -4.2 +4.1 -4.1 +4.2 -4.2 Z 8.7 8.7 9.6 9.6 3.68 3.68 0 0 Table 2 : The coordinate of the points Number of models Finally in this research, three models of sandwich panels with respect to the materials (concrete, polystyrene, and steel wire) in a steel building were modeled and were compared with the brick panel. The general purpose was to study the behavior of the building against the imposed acceleration. Boundary condition and seismic load pattern This paper is an FEM and experimental study on sandwich panel for earthquake load. Therefore, Rezayifar‘s research in 2007, is of high relevance and very similar to the present work. In other words, it is the only article, which has the most common ground with our field of study (sandwich panel and seismic load). Boundary load condition and acceleration time history of El-Centro have been assumed according to Rezayifar‘s experimental research [8]. Electro acceleration is imputed in the support places in X and Y direction. Then, the results of the present study were compared with those of Rezayifar and are in close agreement with the study by Rezayifar [8]. R ESULTS The results in the X direction ncreasing the Young's modulus decreased the frame displacement in different points. The panel’s number on the right side was different from that on the left side. According to the results for points 1 and 3 of the frame right side, the displacement measure on the right side was more than the left side due to the greater mass (three panels). Fig.7 to 18 illustrate the building displacement and acceleration measure at various points of the concrete panel and the frame. It is believed that the material density and height affects the frame displacement. Points on the columns have the greatest measure of displacement and acceleration, followed by the points on the concrete layers, and the least measure of displacement and acceleration is of the insulting layers. Analysis of the overall results of sandwich panels in the frames of other concrete and brick material is presented in diagrams 18 to 24. As it is illustrated in the Figures, applying sandwich panels decreased the frame weight, acceleration and its displacement and hence improved its performance. In the following, the displacement and acceleration measure in different points of the building (panels, concrete layers and column edges) is illustrated for the right and left sides of the building. Fig. 7 and 8 illustrates the maximum value for stress, acceleration, and displacement in the building as an example of a building built with sandwich panel. Fig. 7 presents the displacement and acceleration in the concrete building for 24 hours sample; the displacements and accelerations on 24 hours samples are higher than all samples. Fig. 8 depicts Von-Misses stress in the layers of concrete for 24 hours sample; the stress on 24 hours samples is higher than all samples as shown here. Comparing the results indicated that building sandwich panels with 24-day concrete samples causes an increment in moving frame, imposed acceleration, and stress. Fig. 9a presents the concrete displacement on the 24-hour concrete layers and brick material. Comparing the results of shotcrete concrete with brick material and considering the difference in the displacement measures shows that the displacement could be reduced by 1.21 times at critical points and the displacement was decreased during these times. It could be concluded that applying the concrete with high Young's modulus (shotcrete and Silica) is efficient in improving the behavior of concrete panels, especially the concrete layers as it is shown clearly; when the time passes 11, all of the I