COLLAPSE BEHAVIOR OF STEEL BUILDINGS WITH DEEP COLUMNS UNDER HORIZONTAL AND VERTICAL GROUND MOTIONS
Journal
World Conference on Earthquake Engineering Proceedings
Journal Volume
2021
ISSN
30065933
Date Issued
2021
Author(s)
Abstract
With the use of moment frames at only building perimeter, deep, wide-flange steel columns have been widely used in the U.S. seismic zones since the late 1990s. However, their susceptibility to structural instabilities due to vertical ground motions is not yet well understood. To address this shortcoming, the collapse capacity of a four-story steel moment frame with deep columns under horizontal and vertical ground motions is computationally investigated. The employed finite element models are capable of explicitly capturing the full range of instabilities and major collapse mechanisms. By performing incremental dynamic analysis, the simulation results show that the vertical ground motions can not only change the collapse mechanism, but also decrease the collapse capacity of steel moment frames with deep columns, especially when the vertical progressive collapse is the dominated collapse mechanism. As a result, the vertical ground motions should be considered when frames consist of members vulnerable to global buckling and are susceptible to vertical progressive collapse.
Subjects
deep steel columns
frame collapse simulation
vertical ground motions
Publisher
International Association for Earthquake Engineering
Type
conference paper