INTEGRATED AERODYNAMIC LOAD DETERMINATION AND STIFFNESS DESIGN OPTIMIZATION OF TALL BUILDINGS

摘要

Modern tall steel buildings are wind sensitive and are prone to dynamic serviceability problems. Although wind tunnel techniques have emerged as valuable tools in providing reliable prediction of the wind-induced loads and effects on tall buildings, current design practice normally considers the wind tunnel-derived loads as constant static design loads. Such practice does not take into account the change in wind-induced structural loads while the dynamic properties of a building are modified during the design synthesis process. This paper presents a computer-based technique that couples together an aerodynamic wind tunnel load analysis routine and an element stiffness optimization method to minimize the cost of tall steel buildings subject to the lateral drift design criteria, while allowing for instantaneous prediction and updating of wind loads during the design synthesis process. Results of a full-scale steel building framework with the same geometric shape of the Commonwealth Advisory Aeronautical Research Council (CAARC) standard building indicate that not only is the proposed technique able to produce the cost-effective element stiffness distribution of the structure satisfying the serviceability wind drift design criteria, but a potential benefit of reducing the design wind loads can also be achieved by the stiffness optimization method.