Journal ArticleDOI
Wave Passage and Ground Motion Incoherency Effects on Seismic Response of an Extended Bridge
Reads0
Chats0
TLDR
In this paper, the impact of ground motion spatial variability on the seismic response of an extended highway bridge was investigated and the results obtained from inelastic response-history analyses confirm the significant impact of wave passage and ground motion incoherency on seismic behavior of the bridge.Abstract:
This paper investigates the implications of ground motion spatial variability on the seismic response of an extended highway bridge. An existing 59-span, 2,164-meter bridge with several bearing types and irregularity features was selected as a reference structure. The bridge is located in the New Madrid Seismic Zone and supported on thick layers of soil deposits. Site-specific bedrock input ground motions were selected based on a refined probabilistic seismic hazard analysis of the bridge site. Wave passage and ground motion incoherency effects were accounted for after propagating the bedrock records to the ground surface. The results obtained from inelastic response-history analyses confirm the significant impact of wave passage and ground motion incoherency on the seismic behavior of the bridge. The amplification in seismic demands exceeds 150%, whereas the maximum suppression of these demands is less than 50%. The irregular and unpredictable changes in structural response owing to asynchronous earthquake records necessitate in-depth seismic assessment of major highway bridges with advanced modeling techniques to realistically capture their complex seismic response. DOI: 10.1061/(ASCE)BE.1943-5592.0000155. © 2011 American Society of Civil Engineers. CE Database subject headings: Bridges, highway; Wave action; Seismic analysis; Inelasticity; Dynamic analysis. Author keywords: Extended highway bridges; Seismic assessment; Wave passage; Ground motion incoherence; Site effects; Inelastic dynamic analysis.read more
Citations
More filters
Journal ArticleDOI
Multiple support seismic excitation of the Evripos bridge based on free-field and on-structure recordings
TL;DR: In this paper, the authors focused on the characteristics of the spatially variable earthquake ground motions (SVEGMs) recorded during two seismic events (1999 and 2013) and the corresponding bridge response.
Journal ArticleDOI
Seismic assessment of an existing non-seismically designed major bridge-abutment–foundation system
TL;DR: In this paper, a comprehensive study carried out to assess the seismic response of a 59-span bridge using a refined inelastic modeling approach and considering Soil-Structure Interaction (SSI) is summarized.
Journal ArticleDOI
Seismic performance and cost-effectiveness of high-rise buildings with increasing concrete strength
TL;DR: In this paper, the relationship between the seismic performance and economics of high-rise buildings when designed to different material strengths is investigated, and it is concluded that a considerable saving in construction cost and gain in useable area are attained with increasing concrete strength.
Journal ArticleDOI
Anti-symmetric mode excitation and seismic response of base-isolated bridges under asynchronous input motion
TL;DR: In this article, the effect of asynchronous earthquake ground motion on the transverse response of base-isolated bridges is investigated and statistically correlated with characteristic engineering demand parameters, showing that the detrimental effects of asynchronous excitation are concentrated on the very last piers along the direction of the seismic waves.
Journal ArticleDOI
Simplified design of bridges for multiple-support earthquake excitation
TL;DR: A novel, bridge-dependent approach for quantifying the increase of design quantities due to spatially variable earthquake ground motion (SVEGM), which is essentially an elastic method that is found to be simple, yet precise enough to consist an attractive alternative for the design and assessment of long and/or important bridge structures in earthquake-prone regions.
References
More filters
Journal ArticleDOI
Prediction of Strong Ground Motion Using the Hybrid Empirical Method and Its Use in the Development of Ground-Motion (Attenuation) Relations in Eastern North America
TL;DR: In this article, the authors proposed a hybrid empirical method that uses the ratio of stochastic or theoretical ground motion estimates to adjust empirical ground-motion relations developed for one region to use in another region.
Journal ArticleDOI
Empirical spatial coherency functions for application to soil-structure interaction analyses
TL;DR: In this article, the spatial coherency of strong ground motion from fifteen earthquakes recorded by the Lotung LSST strong motion array is analyzed, and the results indicate that at high frequencies (>10 Hz) over 25 percent of the power of the ground motion is random for station separations greater than 30 m.
Development of regional hard rock attenuation relations for central and eastern north america
TL;DR: In this paper, the authors used the stochastic point-source model (SPSM) for estimating ground motion in central and eastern North America (CENA) conditions.