Abstract
The lateral load-resisting system of high-rise buildings in regions of low and moderate seismicity and strong wind such as the typhoon in the Korean peninsula considers the wind load as the governed lateral force so that the practical structural engineer tends to skip the evaluation against the seismic load. This study is to investigate wind-designed steel diagrid buildings located in these regions and check the possibility of the elastic design of them out. To this end, first, the diagrid high-rise buildings were designed to satisfy the wind serviceability criteria specified in KBC 2016. Then, the response spectrum analyses were performed under various slenderness ratio and wind exposures. The analyses demonstrated the good seismic performance of these wind-designed diagrid high-rise buildings because of the significant over-strength induced by the lateral load-resisting system of high-rise buildings. Also, the analysis results showed that the elastic seismic design process of some diagrid high-rise buildings may be accepted based on slenderness ratios in all wind exposures.
Highlights
Since the late 1980s, seismic design has become mandatory in the design standards so that there has been controversy about setting the direction of seismic design in the low and moderate seismicity
Where Ed is the elastic modulus of the diagrid, h is the height of a tier, Ld is the length of the diagrid member, M is the overturning moment of each tier, Nd, f is the number of the diagrid in the flange frames, Nd, w is the number of the diagrid in the web frames, S is the ratio of the roof displacement by the shear force-to-roof displacement by the overturning moment (=(H/w) – 3), V is the shear force of each tier, a is a limited variable of the roof displacement for the wind load (=500), g* is 1/[(1 + S)a], dd is the contribution of the web frames for the flexural stiffness (=2), and x* is (2g*S)/H
The results are as follows: 1. In this study, high-rise buildings with the strong wind zone and the low and moderate seismicity have been designed by the wind load that is larger than the seismic load considering the nonlinear behavior of structures in terms of static loads
Summary
Since the late 1980s, seismic design has become mandatory in the design standards so that there has been controversy about setting the direction of seismic design in the low and moderate seismicity. In the strong wind region where the typhoon frequently appears and the low and moderate seismicity such as the Korean peninsula, the possibility of the elastic design of highrise buildings is enough. High-rise buildings in the low and moderate seismicity have the very small the base shear force due to the seismic load and are designed to have the considerable system over-strength due to the required serviceability from the wind design procedure. The potential of the elastic seismic design and the seismic performance of the highrise steel diagrid frames according to various wind exposures were investigated considering these conditions. Considering the limitations of the roof displacement, the width-to-thickness ratio of the diagrid members for seismic design, and the direction of wind, the size of structural members is largely increased,
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