Domes have been used since ancient times in constructions. These are effective structures in supporting loads for large span. Dome has an added advantage of having good looking in structural applications. Many shapes of domes are being used nowadays for residential, commercial, and industrial purposes. Specific purpose domes are also used for nuclear containment. Main threats to structures are from the bomb blast. Hence, domes too are to be designed to withstand effectively the pressure energy generated by the blast. A comparative theoretical study is proposed on the different shapes of domes having same weight and thickness. Various responses are estimated through numerical method after simulating blast and comparing their intensities.
This article describes the plastic contraction phenomenon and energy absorption of aluminum tubes, under axial compression by conical entry dies. Experiments were carried out on aluminum tubes machined from commercially available tubes. All tubes had outer diameter of 30 mm and inner diameter was made such that the tubes were obtained in the thickness range of 1-5 mm. The dies were made with semiangles of 5°, 10°, 15°, and 20°. The straight portion of die had inner diameter of 28.5 mm; hence, the diametric interference of 1.5 mm was obtained at straight portion. These dies were made with steel with sufficient thickness to treat them as rigid. The numerical simulation was done for the experiments using LS-DYNA software. Based on numerical and experimental results, the force-displacement graph characteristics for different deformations modes were discussed in detail. Effects of tube thickness and its interference with die were studied. The effect of material property on energy absorption was studied. The effect of friction on overall energy was also studied. The various associated characteristics such as tube deformation at tip and stress pattern were also studied.
SRCFT columns are formed by inserting a steel section into a concrete-filled steel tube. These types of columns are named steel-reinforced concrete-filled steel tubular (SRCFT) columns. The current study aims at investigating the various types of reinforcing steel section to improve the strength and hysteresis behavior of SRCFT columns under axial and lateral cyclic loading. To attain this objective, a numerical study has been conducted on a series of composite columns. First, FEM procedure has been verified by the use of available experimental studies. Next, eight composite columns having different types of cross sections were analyzed. For comparison purpose, the base model was a CFT column used as a benchmark specimen. Nevertheless, the other specimens were SRCFT types. The results indicate that reinforcement of a CFT column through this method leads to enhancement in load-carrying capacity, enhancement in lateral drift ratio, ductility, preventing of local buckling in steel shell, and enhancement in energy absorption capacity. Under cyclic displacement history, it was observed that the use of cross-shaped reinforcing steel section causes a higher level of energy dissipation and the moment of inertia of the reinforcing steel sections was found to be the most significant parameter affecting the hysteresis behavior of SRCFT columns.
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