Earthquakes cause rapid variations of direction, speed and acceleration. Vibrations are generated either by the moves of the tectonic plates, or by the volcanic activity, or by the collapse of the geological layers. The foundation conveys the maintained oscillatory movement and executes free cushioned oscillations. Due to the seismic action, an energy balance is created that contains: the energy induced into the structure, the energy absorbed by the structure and the energy returned to the ground. All these forms of energy constitute the capable energy of the structure. This energy reflects the possibilities of elastic structure deformation but also the elastoplastic deformation capacity. The seismic insulation systems are intended to reduce the impact of earthquakes on buildings by means of special devices. One uses two types of seismic systems: active and passive. The insulation of the propping base of the structure aims at inserting a smaller amount of energy into the superstructure. The protection of the structures exposed to the risk of earthquake is based on the three fundamental operational modes: insulation, connection, dissipation of energy. Connectors. Insulators and seismic dampers. The centrically braced metallic frames provide resilience, rigidity and ductility, being thus ideal for the bracing of the seismic systems.
To study the vibrations of a Multiparker lift lift model, use various models for the lifting mechanism. Calculate the first pulsation using the Dunkerley method. Behavior of the elevator to the action of an explosive task. We intend to evaluate the own pulsations in case of free vibrations of a lifting mechanism at an elevator within a multiparker parking lot. IT is absolutely necessary that the wave pulsation is different from the own pulsation of the studied system so as to avoid the resonance phenomenon leading to the system’s destruction. We shall establish a work algorithm using several models of the system as following: the model of the system with an autonomy degree; the calculation of the first own pulsations is used by the Dunkerley method; the model of the continuous system.A model is executed for the lifting mechanism of the Multiparker parking lot, considered as being composed of a continuous and homogeneous bar, embedded at the base, becoming a common unit with the mass M of the elevator. The own pulsations are determined in case of free vibrations for this bar.
This work deals with the need and possibility of building car parks in Bucharest above Dâmbovița River. They included analyses referring to the evolution of the number of existing vehicles in Bucharest, an analysis of the number of vehicles in Bucharest, as compared to other European capitals, and also certain elements leading to the possibility and profitability of building a car park above Dâmbovița River. As a result of impact studies and research on overland parking over the Dambovita river, it was concluded that the most popular solution of respondents would be a parking equipped with a smart boarding system, built on a round platform and metal frame. A photovoltaic-panel installation can be used in parallel to supply electricity with renewable energy(sunlight). The protection of the structures exposed to the risk of earthquake is based on the three fundamental operational modes: insulation, connection, dissipation of energy The parking is protected against earthquake using the method of design/consolidation by insulating the base.
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