Showing papers by "Gregory G. Deierlein published in 2019"
TL;DR: In this article, nonlinear static and dynamic analyses are utilized by engineers for performance-based seismic risk evaluation of new and existing structures, in this context, nonlinear component modeling c...
Abstract: Nonlinear static and dynamic analyses are utilized by engineers for performance-based seismic risk evaluation of new and existing structures. In this context, nonlinear component modeling c...
57 citations
TL;DR: Building performance evaluations at the design basis earthquake (DBE) and the maximum considered earthquake (MCE) shaking intensities suggest that 1970s tall steel moment frames have much higher risks of collapse under extreme ground motions and risks of damage and building closure in moderate earthquakes.
29 citations
TL;DR: Rocking braced frames (RBF) are innovative structural systems that maintain near-zero residual drift through controlled rocking and a self-centering posttensioning system.
Abstract: Rocking braced frames (RBF) are innovative structural systems that maintain near-zero residual drift through controlled rocking and a self-centering posttensioning system. The braced frame ...
18 citations
TL;DR: In this paper, gypsum partition walls are shown to be susceptible to earthquake damage under small story drift ratios, which can result in large loss ratios and large loss in gypsuma partitions.
Abstract: Observed earthquake damage, laboratory tests, and loss analyses have shown gypsum partition walls to be susceptible to earthquake damage under small story drift ratios, which can result in large lo...
17 citations
TL;DR: In this paper, the effects of earthquake ground motions in deep sedimentary basins on structural collapse risk were examined using physics-based earthquake simulations of the Los Angeles basin developed by the University of Southern California.
Abstract: This paper examines the effects of earthquake ground motions in deep sedimentary basins on structural collapse risk using physics-based earthquake simulations of the Los Angeles basin developed thr...
16 citations
TL;DR: In this article, collapse risk and drift demands of a 20-story archetype tall building using ground motions at four sites in the Los Angeles (LA) basin are calculated form nonlinear structural analyses using large datasets of unscaled, site-specific simulated seismograms.
Abstract:
Limited data on strong earthquakes and their effect on structures pose challenges of making reliable risk assessments of tall buildings. For instance, although the collapse safety of tall buildings is likely controlled by large‐magnitude earthquakes with long durations and high low‐frequency content, there are few available recorded ground motions to evaluate these issues. The influence of geologic basins on amplifying ground‐motion effects raises additional questions. Absent recorded motions from past large magnitude earthquakes, physics‐based ground‐motion simulations provide a viable alternative. This article examines collapse risk and drift demands of a 20‐story archetype tall building using ground motions at four sites in the Los Angeles (LA) basin. Seismic demands of the building are calculated form nonlinear structural analyses using large datasets (∼500,000 ground motions per site) of unscaled, site‐specific simulated seismograms. Seismic hazard and building performance from direct analysis of Southern California Earthquake Center CyberShake motions are contrasted with values obtained based on conventional approaches that rely on recorded motions coupled with probabilistic seismic hazard assessments. At the LA downtown site, the two approaches yield similar estimates of mean annual frequency of collapse (λc), whereas nonlinear drift demands estimated with direct analysis are slightly larger primarily because of differences in hazard curves. Conversely, at the deep basin site, the CyberShake‐based analysis yields around seven times larger λc than the conventional approach, and both hazard and spectral shapes of the motions drive the differences. Deaggregation of collapse risk is used to identify the relative contributions of causal earthquakes, linking building responses with specific seismograms and contrasting collapse risk with hazard. A strong discriminative power of average spectral acceleration and significant duration for predicting collapse is observed.
15 citations