Tall buildings during their lifetime are subject to dynamic loads continuously, caused by the wind, seismic oscillations, vibrations caused by machineries, etc. In some cases, under the action of strong earthquakes, structures undergo large displacements and may suffer significant structural damage, and even be destroyed. With the growth of population every year, more and more increases the role of high structures, and therefore the design of these structures should have a greater importance. In other words, the design of high structures in seismic areas as Albania is a major challenge. The most dangerous consequence of the earthquake is the collapse of the building caused by large displacements of the structure. Therefore the structure should have sufficient ductility which is imperative to limit the displacements, in this way and Force - Displacement effect will be smaller. This can be accomplished by placing to the structure elements that stiffener it, such as a shear walls or steel braces, or dumpers. The focus of this paper is to analyze the use of braced frames as a method to limit the displacement of the building and therefore to prevent the collapse of tall buildings in seismic regions. To make a comparison between braced frames in X, V and K configuration; in this paper I am going to analyze two structural systems. The first one is a frame system with 12 stories, three spans; the middle span is the one where I am going to put firstly the steel brace system in X form, than the V form and finally the K configuration of brace system. For this frame I am going to compare the response of the building and the differences between the use of one or another type of system. After that, the same analyze is going to happen also for a 7 stories frame structure. As a conclusion of this research will be the effectives of these three types of steel braced system through the comparison method of the two buildings, seven and twelve stories frame system.
Types of steel braced systems and differences among them – Research about the effectiveness of these systems in a 12 and 7 story building.
Egla Luca
2015
Abstract
Tall buildings during their lifetime are subject to dynamic loads continuously, caused by the wind, seismic oscillations, vibrations caused by machineries, etc. In some cases, under the action of strong earthquakes, structures undergo large displacements and may suffer significant structural damage, and even be destroyed. With the growth of population every year, more and more increases the role of high structures, and therefore the design of these structures should have a greater importance. In other words, the design of high structures in seismic areas as Albania is a major challenge. The most dangerous consequence of the earthquake is the collapse of the building caused by large displacements of the structure. Therefore the structure should have sufficient ductility which is imperative to limit the displacements, in this way and Force - Displacement effect will be smaller. This can be accomplished by placing to the structure elements that stiffener it, such as a shear walls or steel braces, or dumpers. The focus of this paper is to analyze the use of braced frames as a method to limit the displacement of the building and therefore to prevent the collapse of tall buildings in seismic regions. To make a comparison between braced frames in X, V and K configuration; in this paper I am going to analyze two structural systems. The first one is a frame system with 12 stories, three spans; the middle span is the one where I am going to put firstly the steel brace system in X form, than the V form and finally the K configuration of brace system. For this frame I am going to compare the response of the building and the differences between the use of one or another type of system. After that, the same analyze is going to happen also for a 7 stories frame structure. As a conclusion of this research will be the effectives of these three types of steel braced system through the comparison method of the two buildings, seven and twelve stories frame system.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
