109 / 2022-04-25 13:47:50

A Study on the Performance-Based Wind Design of Tall RC Buildings Using Wind Response Modification Factor

Wind Resistance Performance,Performance-Based Wind Design,Time History Analysis,RC High-Rise Building,Wind Design,Inelastic Design

Current design standards and codes in most countries, such as Korea and the United States, stipulate that all structural members remain elastic under ultimate wind load conditions for wind design. For this reason, horizontal structural members such as RC coupling beams are over-designed to have excessive stiffness and strength. In seismic design, the RC coupling beams are generally designed to yield under strong seismic force to dissipate the earthquake-induced energy. Because all structural members must be designed to be in an elastic state under ultimate wind load per the wind design procedure, the RC coupling beams are often designed to have higher stiffness and strength in wind design than that in seismic design. According to a recent study, in Korea, design wind load is larger than design seismic load for concrete buildings with about 30 stories or more, where the design seismic load is reduced by the response modification factor, R (Kang et al., 2019a). Therefore, there is a possibility that yielding does not occur in the coupling beams under a strong earthquake; rather, the damage can be transferred to vertical members such as RC shear walls, and it leads to a decrease in ductility of the entire structural system.



Recently, performance-based wind design, which partially allows inelastic behavior under wind load, has emerged, and many related studies have been conducted (Alinejad et al., 2020, Jeong et al., 2021). The performance-based wind design was included in ASCE 7-22 and KDS 41 in Korea, and it is expected that the decrease in system ductility due to elastic wind design can be solved through the performance-based wind design. However, the design standard mentioned above included only the performance-based wind design itself, and specific modeling and analysis procedures were not established yet. Furthermore, since the wind resistance performance of the concrete structure is greatly influenced by the geometric shape of the building, the design data according to various geometric shapes are significant. Therefore, in this study, performance-based wind design was performed for RC high-rise buildings with three planar shapes (Fig. 1), and differences in analysis results or wind resistance performance according to the geometric shape were investigated.