PSI - Issue 33

Alexey Fedorenko et al. / Procedia Structural Integrity 33 (2021) 652–657 Fedorenko A., Fedulov B., Jurgenson S., Lomakin E./ Structural Integrity Procedia 00 (2019) 000–000

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industry. One of the reasons is the complexity of manufacturing due to the need of stamping and welding processes [4], which are frequently considered problematic for strength prediction and quality control. The modelling of sandwich properties can be done by the modern computation methods [5], while the manufacturing is effectively resolved by robotics and nondestructive control. This work presents the construction panel, composed by two outer steel sheets and pyramidal core between, as presented in Fig.1.

Fig. 1. Sandwich panel with lattice pyramidal core (the space between outer sheets is filled with concrete)

The space between the sheets is filled with the concrete, so lattice structure plays a role of reinforcement similar to bars in conventional construction plate. In previous study [6] authors show that it is possible to achieve the stiffness and strength characteristics of the proposed structure under three-point bending at least two times higher in comparison with conventional plate in condition of equal metal consumption. In addition, the compressive load is also should be considered since compression prevails in many elements of the building. Intuitively, the considered conventional plate has no reinforcements in out of plane direction and therefore has significantly lower buckling load in comparison with proposed structure. Nevertheless, it is important to analyze the failure modes of both plates under compression, since it is governed by the complex response of the concrete and reinforcement.

2. Modelling of plate compression 2.1. Plate structure and dimensions

The total plate dimensions are shown in Fig.2, and the cases of conventional bars or pyramidal lattice are considered. The cell size of reinforcement using conventional bars with the radius of 7.7 mm is 150 mm. The unit rib of lattice has dimensions of 100x300 mm and a thickness of 2 mm. The total mass of steel reinforcements is 560 kg in both cases.