Architecture
M. Mazloum
Abstract
: The lateral load bearing systems of structures are divided to four major groups, which are: moment frames, shear walls, bracings, and combined systems that contain a combination of the previous ones. Nowadays, the combined systems of moment frames and shear walls are utilized in high-rise reinforced ...
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: The lateral load bearing systems of structures are divided to four major groups, which are: moment frames, shear walls, bracings, and combined systems that contain a combination of the previous ones. Nowadays, the combined systems of moment frames and shear walls are utilized in high-rise reinforced concrete structures frequently; therefore, the method of educating these systems is quite significant for postgraduate students and professional engineers. It is worth noting that according to the Iranian code of practice for seismic resistant design and also the Iranian concrete building code, the analysis and design of these combined structures have been complicated because the moment of inertia of cracked sections should be used. In this paper, the different methods of educating the combined shear wall – moment frame structural systems, which are conventional, computerized and a combination of these two methods, have been investigated. The results of statistical studies show that the combination of conventional and computational methods was more successful than the other ones. The only negative point of this method was that the time taken for teaching was improved about two times. Obviously, using the prepared handouts containing some necessary information and examples, decreased this period, and it became about 1.5 times of the other methods.
Architecture
M. Mahmoudi Sahebi
Abstract
Performance design based on performance is a new method in which structural damage against different levels of risk (earthquake) is clearly assessed and structural and non-structural performance of structures by limiting strength, stiffness and ductility. Members are controlled. To achieve these goals, ...
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Performance design based on performance is a new method in which structural damage against different levels of risk (earthquake) is clearly assessed and structural and non-structural performance of structures by limiting strength, stiffness and ductility. Members are controlled. To achieve these goals, a nonlinear analysis of the structural model is essential. To perform this analysis, the basic characteristics of the structure (initial strength and stiffness) are required. The closer the initial values are to the final values, the easier and faster the process of analyzing and designing the structure will be. The main purpose of this paper is to provide a method that can be used to easily and quickly obtain the initial strength and stiffness of the structure for nonlinear analysis. For this purpose, coefficients are proposed that can be used to make the required strength and stiffness of reinforced concrete bending frames for each of the functional modes; Intermediate use (IO), life safety (LS) and structural destruction limit (CP) were determined. These coefficients are the coefficient of behavior (Rw) and the coefficient of magnification of the displacement (Cd), which are used to calculate the strength and stiffness required by the structure, respectively. The recommended values for behavioral coefficients in different functional states of IO, LS, and CP are 2.28, 4.43, and 5.3, respectively. The values of 2.29, 4.73 and 5.83 have also been suggested for displacement magnification coefficients in different functional modes. Studies show that the use of the above coefficients in calculating the required strength (base shear) and initial stiffness (by controlling lateral displacement) of structures, will make the next steps of work and nonlinear analysis of structures easier and faster. .
