الفهرس Only 14 pages are availabe for public view
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Abstract
Practical design of framed structures subjected to severe environmental loads, such as earthquakes, leads often to an increase in both weight and cost of such structures. In this thesis, it is intended to propose a step-by-step technique which can help saving both weight and price. First, control devices are utilized to absorb or dissipate a part of energy caused by these dynamic loads and consequently to reduce the structural response. In this context, no feasible analytical method, unfortunately, is capable of predicting the response of general arbitrary systems with high accuracy. The available methods depend strongly on the degrees-of-freedom of the system, type of nonlinearity and the random excitation modeling the earthquake, respectively. Two efficient methods are applied in this paper, namely; Monte Carlo Simulation (MCS) and Statistical Equivalent Linearization (EQL). Second, an optimization tool with suitable optimality criteria is combined with MCS or EQL. In order to prove the efficiency of such optimum design control technique, two different examples (12-Story Buildings and Al-Ghury Minaret of Al-Azhar Mosque in Egypt) are investigated where the ground motion is modeled as pure and filtered white noise processes with Kanai-Tajimi equation. The results show that a remarkable saving in weight and price can be ensured.