الفهرس 
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Abstract
Several structural systems have been, recently, developed for the construction of tall reinforced concrete and steel buildings such as the framed-tube system, tube in-tube system and shear wall system. The main objective of this investigation is to study the structural behaviour of framed-tube buildings under lateral loads. In this thesis of framed-tube buildings.
The historical development of tall buildings is presented in Chapter 1, with emphasis on the structural systems suitable for reinforced concrete and steel construction.
The development of the framed-tube system is, in particular, investigated in detail. The various approximate methods, currently available in the literature, for the analysis of tall framed-tube systems are discussed. The scope and objectives of the present work are outlined in detail.
The fictious shear element method is presented in chapter2. In this method, the framed-tube building is transformed into a plane frame with horizontal fictitious shear elements introduced at eah floor along all corner joits. The main assumptions are outlined. The method of analysis is described in detail. The stiffness matrix of the shear elements is described. The numerical solution is carried out using a simple computer program for the analysis of plane frames using the direct element method with some modifications.
The interactive force method is presented in detail in chapter 3. In this method, the four plane frames constituting te space tube are separated and analysed individually. Compatibility of deformations of junction corner lines is achieved by introducing interactive vertical force at corner joints. at each corner line, and then to determine the internal forces in each plane frame.
The equivalent orthotropic tube method is discussed in chapter 4. In this method , the framed-tube system is replaced by a tube made up of four rectangular orthotropic plates. Tthickness and material properties of the equivalent orthotropic tube are chosen to comply with the geometric and stiffness properties of the original system. The main assumption are outlined in detai. from the study of the stress-strain relttionships and through minimization of the energy of the system, the governing differential equation is obtained. A set of equations and design curves are obtained for the approximate alalsis of framed-tube buildings.
Anew technique for the approximate analysis of tube buildings subjec to distortional loads is developed.In chapter 5.In this method, the original space system is transformed into a plane frame. Fictitious diaphragms are introduced at each floor level to account for the out-of-plane stiffness of the plane frames. Simple formuli are derived to determine the stiffness properties of the diaphragm members. The problem is then carried out by the direct element method for plane frames.
Chapter 6 presents a summary of the present work together with the main concluding remarks.