Abstract

Seismic design provisions use the ductility and reserve strength of the lateral structural system to reduce the loads used in design, making the structural design more economical while maintaining life safety. In contrast, current wind design provisions do not. Conventional wind design relies primarily on elastic behavior. The objective of this study is to determine a wind response modification factor for steel concentrically braced frames that could be applied to reduce wind design loads based on ductility and reserve strength, while still meeting drift requirements for serviceability of the structure. To achieve the objective, three types of ductile braced frames were designed for a three-story building. The response of the frames to increasing wind pressure was determined using incremental dynamic analyses. The collapse pressures and serviceability drifts were determined for each braced frame and compared to the performance of conventionally designed braced frames. Parametric studies were used to determine the sensitivity of the results to the design location and the uncertainty in the analysis. The results indicate that a response modification factor of 2.0 is appropriate for the steel concentrically braced frames examined in this study. The findings suggest that using the lateral system reserve strength and ductility in wind design has the potential to lead to a more efficient structural design.

Degree

College and Department

Ira A. Fulton College of Engineering; Civil and Construction Engineering

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