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In rack systems, due to operational necessities, bracing of the system is limited in down-aisle direction. In addition, generally thin-walled components with single symmetry axis are used. Therefore, eccentric conditions may occur in the structure, which might affect system stability. There are studies in the literature about the stability aspect of these systems. In terms of stability, use of bracings and support conditions are prominent in rack systems. In this paper, effect of different base-plate types on system behaviour and energy dissipation ca-pacity for low-rise rack systems with different bracing conditions was investigated. In this context, tests and numerical analyses were performed. Numerical models are validated with experimental test. In the test, static pushover has been performed for three two-storey full scaled models with different bracing conditions. For numerical analysis, the static pushover test is performed with the addition of base-plate type changes. In nu-merical analysis, three types of base-plates are employed with three bracing cases. In this context, it was detected that bracings in the system provide stiffness to the system, however in single-modular rack systems such as the subject of our study, the external bracings cause torsional effects. Therefore, beneficial effect of the bracings can not be utilised efficiently. However, it was also detected that as the rotational stiffness of the base supports increase, torsional effects are restricted. Therefore, it can be suggested that in low-rise, single modular rack systems, use of base-plates with higher stiffness value may provide better system stability as well as more eco-nomic solutions. |
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