Optimization of High-Rise Concrete Buildings


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Title: Optimization of High-Rise Concrete Buildings

Author(s): Jaime Moreno and John Zils

Publication: Special Publication

Volume: 97


Appears on pages(s): 25-92


Date: 2/1/1987

The optimum design of high-rise buildings should satisfy architectural and engineering performance criteria according to codes and local regulations at the most economical cost. The large variety of construction materials and structural systems makes the task of obtaining the optimum solution difficult for the designers. This study is related to the structural variables influencing the economical choice of materials and systems in cast-in-place multi-story construction. An efficient and economical structural system can evolve only through an understanding of the significant factors affecting the design of a tall building. This optimization study has considered a number of these factors in order to evaluate their in-fluence on the optimization process. These factors can be summarized as follows: Design lateral force (wind) Height-to-width ratio of building, Ratio commonly known as Aspect 30 Criteria for lateral stiffness (Drift Ratio) 4 l Type of occupancy (office vs. apartment) Influence on foundation system Fire rating considerations Local availability and cost of primary construction materials The final choice of a structural system depends upon the factors mentioned above. It should be obvious that there cannot be any single structural system that is valid for all cases. It is this philosophical attitude that is essential for the architect and engineer in evaluating the best possible structural system for a particular project, time. for a particular location, at a particular The most common types of multi-story construction are residential and office buildings. Architectural layouts for residential' buildings have their maximum performance from spans of 15 to 24 eet, and for office buildings from spans of 24 to 30 feet. Be-sides the column, caisson, and floor system considerations for these two types of buildings, the lateral load consideration is an important concept in the design of high-rise structures. A maximum recommended drift of l/500 of the height of the building allows the buildings without shear walls (frame buildings) to be built to a certain number of stories depending on the slab thickness and column sizes. When shear walls are added to the frame buildings, they can be built still taller, satisfying the maximum drift limitations.