Study and Investigation of Tall building Design Optimization

Abstract

In tall buildings where the design is extremely affected by the lateral loads, wind and seismic, which could result excessive drifts and cause damage of nonstructural components. The challenging of designing tall building is how to create and optimize lateral loads resistant systems with economic considerations. There is a lot of lateral loads resistant systems has been used for different height of buildings, and each one has economical limit, above that limit the controlling of serviceability limits is highly expensive. The selection of lateral loads resistant system for particular building, is not enough, another effort should be done to optimize the selected system as the location and configuration of that system (i.e. shear walls location, and configurations of a rigid frame). In this research, computerized models for different lateral loads resistant systems has been developed. Each system with variable configurations such as shear walls system which was configured for different locations with respect to the center of mass, and the results compared with each other’s, it was found that the optimum location of shear walls is near to (C.M). For rigid frame the drift affected extremely by major axes of edge columns. For outriggers it’s found that the optimum location ranges from 0.4H to 0.6H without significance change in drift. The drawn recommendations for shear walls to be near the center of mass, with respect to the rigid frame is highly recommended to locate the major axes of edge columns with respect the lateral load. For the outrigger system it is better to use where the wind load governing the lateral loads design.