Impacts of Vertical Irregularity on the Seismic Design of High-Rise Buildings


Abstract eng:
Many tall buildings are practically irregular, as a perfect regular high-rise building rarely exists. The structural irregularity increases the uncertainty related to the capacity of the building to meet the design objectives. There is a pressing need to systematically assess the impacts of vertical irregularity on the seismic design of tall buildings, particularly the extreme irregularity types. This study is thus devoted to evaluate the seismic design coefficients of the modern tall buildings with different vertical irregularity features. A brief survey of the most common vertical irregularities in reinforced concrete multistory buildings is conducted to select reference structures. Five 50-story buildings are then selected and fully designed using three-dimensional finite element models and international building codes to represent well-designed regular and irregular tall buildings in Dubai, UAE, a medium seismicity region that is selected as a case study. Fiber-based simulation models are developed to assess the seismic response of the five benchmark buildings under the effect of forty earthquake records representing far-field and near-source seismic scenarios. The selected real earthquake records account for the ground motion uncertainty and the seismicity of the case study area. The comprehensive results obtained from a large number of inelastic pushover and incremental dynamic analyses provide insights into the local and global seismic response of the reference structures and confirm the unsatisfactory response of tall buildings with severe vertical irregularities. Due to the significant impacts of the severe irregularity types on the seismic response of tall buildings, the conservative code coefficients are recommended in design. The study also concluded that although the design coefficients of regular tall structures and buildings with insignificant irregularities are adequately conservative, they can be revised to arrive at a more cost-effective design of tall buildings.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 162.:
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