Numerical Modeling of the U-Boot Roof Behavior and Its Comparison with the Steel Deck Roofs, Cobiax roof, and Concrete Slabs

Undoubtedly, one of the main and effective members in building structures is the ceiling, and the type of execution of this part of the structure will play a significant role in the speed and quality of the entire structure. The application of old materials and traditional construction methods no longer meets the desired speed and design needs. In this study, in addition to introducing the structure of U-Boot roof, an attempt has been made to provide a comparative approach in terms of structural performance with other common roofs such as steel deck roof, concrete slab and Cobiax roof. For this purpose, after ensuring the results of modeling using Abacus software, modeling of numerical samples and comparing them with other common ceilings have been done. The results indicate that by comparing concrete slabs, when increasing the compressive strength of the specimens, the amount of final yield load is increased, but after the yield point, the failure of the specimens was immediate. Then the load capacity has remained constant for the same displacement, and with a decrease of 30% in the number of U-Boots and a 20% increase in compressive strength, the amount of load capacity has increased by about 22.32%. Comparing these specimens with the state without reducing the number of U-Boots, it is determined that for each similar sample, the load bearing capacity has increased by 10%. The U-Boot roof also has higher hardness and load-bearing capacity than other roofs and the concrete slab has the lowest load-bearing capacity in the same displacements. The performance of the steel deck roof and the Cobiax roof is also close in terms of bearing capacity, but in terms of the hardness or gradient of the force-displacement curve, the Cobiax roof has shown more hardness.