More efficient lateral load patterns for seismic design of steel moment-resisting frames

Moghaddam, H ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.1680/jstbu.17.00064
  3. Publisher: ICE Publishing , 2018
  4. Abstract:
  5. The preliminary design of building structures is normally based on the equivalent lateral forces provided in seismic design guidelines. The height-wise distribution of these loads is predominantly based on elastic vibration modes. However, as structures exceed their elastic limits in severe earthquakes, these design load patterns may not necessarily lead to efficient distribution of strength within the structures. To address this issue, several alternative load patterns have been proposed for the seismic design of non-linear structures. However, due to the simplifications involved in the development of these design load patterns, their adequacy needs to be assessed for different structural systems and earthquake excitations before they can be used in common practice. The aim of this work was to identify the most suitable lateral load patterns for the seismic design of steel moment-resisting frames. To do this, the non-linear seismic behaviour of three-, five-, seven-, ten- and 15-storey frames designed with nine different lateral load patterns were compared under 20 real and synthetic spectrum-compatible earthquakes using performance parameters such as maximum inter-storey drift, maximum plastic hinge rotation and cumulative damage. It was found that, for the same structural weight, structures designed with more efficient load patterns experienced up to 68% less global damage than their code-based counterparts. © ICE Publishing: All rights reserved
  6. Keywords:
  7. Seismic engineering ; Structures and design ; Architectural design ; Buildings ; Earthquake engineering ; Earthquakes ; Loads (forces) ; Seismic response ; Steel beams and girders ; Steel structures ; Structural frames ; Distribution of strength ; Earthquake excitation ; Nonlinear structure ; Performance parameters ; Plastic hinge rotations ; Preliminary design ; Severe earthquakes ; Steel moment resisting frame ; Building ; Loading ; Seismic design ; Steel structure ; Structural component ; Vibration
  8. Source: Proceedings of the Institution of Civil Engineers: Structures and Buildings ; Volume 171, Issue 6 , 2018 , Pages 472-486 ; 09650911 (ISSN)
  9. URL: https://www.icevirtuallibrary.com/doi/abs/10.1680/jstbu.17.00064