In general, the shear wall with moment frame system, the shear wall with outrigger system, the tubular system, the mega column system and the cross wall system are adopted as lateral resisting system to high-rise buildings. And a common factor of these systems that resist from lateral loads is the s...
In general, the shear wall with moment frame system, the shear wall with outrigger system, the tubular system, the mega column system and the cross wall system are adopted as lateral resisting system to high-rise buildings. And a common factor of these systems that resist from lateral loads is the shear wall in the core. Determining the appropriate size of the core is a key factor of designing the lateral resisting system and if the central core is relatively strong to the lateral displacement, restrictions on the grid and facade plan would decrease because requirement of other elements would be reduced.
In this paper, earlier studies about high-rise building system was reviewed first, and to make a study of the core size which can be considered as the basic factor of this system, quantitative analysis was conducted on the building model that has central core-shear wall system with square plan, for the purpose of knowing the relationship with the core size which is concerned in the variation of the number of stories.
Above all, changing the number of stories, comparative studies about the relation between the core size and area ratio of the core that satisfy the aimed lateral displacement at the uppermost story(H/450) were examined. And effects from changed rigidity of moment frame around the core are also investigated. Next, adding other stories from the basic model, effect of changed wall thickness was examined. And variation of lateral displacement according to the slenderness ratio of the core was analyzed. Lastly, the differences are also presented by comparing shear wall-outrigger system with belt truss system.
To summarize the conclusion of study so far achieved, it is like as follows.
1. According to the varying slenderness ratio, distribution of values which represents the core size appears like a gradual curve in the graph. Overall, the values were similar, in spite of the differences which depends on rigidity around the core.
2. Except the rapidly changing section about rigidity of the frame in the graph, area ratio of the core represents linear pattern and the gradient ranged from 5.5 to 6.0.
3. The higher the height of model rises, it represents that the effect of the wall thickness for the lateral displacement control is lessened. And as the wall thickness increases, displacement was decreased linearly.
4. As the wall thickness increases, the maximum value of story drift was lessened at a certain rate from the earthquake loads regardless of the height. And the reduction ratio which is rating at 1-3%, was very low.
5. According to the results of comparing the outrigger-shear wall system with the area ratio of the core, as appling the outrigger to the models, size of the core was reduced much. And as the height of a building rises, reduction ratio that the core size to the entire area was increased but efficiency of the reduction ratio for the ratio of core size was lessened.
6. The case that installed the only one outrigger, decreasing rate of area ratio of the core was high, but efficiency was decreased by increasing the number of outriggers 1 to 2 or 3, so the efficiency of the decreasing rate of core size in accordance with growth in number of outrigger was not so large.
7. When the belt-truss was set up, the area ratio of the core was bigger than the outrigger system and there was definite difference as the story of a building rises. But there was not much difference in area ratio of the core when comparing the model applied the belt-truss and outrigger at once with the model applied the outrigger only.
In general, the shear wall with moment frame system, the shear wall with outrigger system, the tubular system, the mega column system and the cross wall system are adopted as lateral resisting system to high-rise buildings. And a common factor of these systems that resist from lateral loads is the shear wall in the core. Determining the appropriate size of the core is a key factor of designing the lateral resisting system and if the central core is relatively strong to the lateral displacement, restrictions on the grid and facade plan would decrease because requirement of other elements would be reduced.
In this paper, earlier studies about high-rise building system was reviewed first, and to make a study of the core size which can be considered as the basic factor of this system, quantitative analysis was conducted on the building model that has central core-shear wall system with square plan, for the purpose of knowing the relationship with the core size which is concerned in the variation of the number of stories.
Above all, changing the number of stories, comparative studies about the relation between the core size and area ratio of the core that satisfy the aimed lateral displacement at the uppermost story(H/450) were examined. And effects from changed rigidity of moment frame around the core are also investigated. Next, adding other stories from the basic model, effect of changed wall thickness was examined. And variation of lateral displacement according to the slenderness ratio of the core was analyzed. Lastly, the differences are also presented by comparing shear wall-outrigger system with belt truss system.
To summarize the conclusion of study so far achieved, it is like as follows.
1. According to the varying slenderness ratio, distribution of values which represents the core size appears like a gradual curve in the graph. Overall, the values were similar, in spite of the differences which depends on rigidity around the core.
2. Except the rapidly changing section about rigidity of the frame in the graph, area ratio of the core represents linear pattern and the gradient ranged from 5.5 to 6.0.
3. The higher the height of model rises, it represents that the effect of the wall thickness for the lateral displacement control is lessened. And as the wall thickness increases, displacement was decreased linearly.
4. As the wall thickness increases, the maximum value of story drift was lessened at a certain rate from the earthquake loads regardless of the height. And the reduction ratio which is rating at 1-3%, was very low.
5. According to the results of comparing the outrigger-shear wall system with the area ratio of the core, as appling the outrigger to the models, size of the core was reduced much. And as the height of a building rises, reduction ratio that the core size to the entire area was increased but efficiency of the reduction ratio for the ratio of core size was lessened.
6. The case that installed the only one outrigger, decreasing rate of area ratio of the core was high, but efficiency was decreased by increasing the number of outriggers 1 to 2 or 3, so the efficiency of the decreasing rate of core size in accordance with growth in number of outrigger was not so large.
7. When the belt-truss was set up, the area ratio of the core was bigger than the outrigger system and there was definite difference as the story of a building rises. But there was not much difference in area ratio of the core when comparing the model applied the belt-truss and outrigger at once with the model applied the outrigger only.
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