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7. Seismic Vulnerability and Post-Event Actions [Project Summary]

Author

Texas Department of Transportation. Research and Technology Implementation Office, United States. Department of Transportation. Federal Highway Administration, Clayton, Patricia, Khosravikia, Farid, Potter, Anderson, Prakhov, Vyacheslav, Zalachoris, Georgios, Cheng, Tianjian, Tiwari, Ayushi, Cox, Brady R., Rathje, Ellen M., Williamson, Eric, Paine, Jeffrey G., Frohlich, Cliff, University of Texas at Austin. Center for Transportation Research, Texas Department of Transportation. Research and Technology Implementation Office, United States. Department of Transportation. Federal Highway Administration, Clayton, Patricia, Khosravikia, Farid, Potter, Anderson, Prakhov, Vyacheslav, Zalachoris, Georgios, Cheng, Tianjian, Tiwari, Ayushi, Cox, Brady R., Rathje, Ellen M., Williamson, Eric, Paine, Jeffrey G., Frohlich, Cliff, and University of Texas at Austin. Center for Transportation Research

Abstract

0-6916, Historically, seismic hazards have not been a major concern in the design and maintenance of bridges in the State of Texas due to the infrequency and low magnitudes of seismic events experienced in the state. A recent increase in the number earthquakes across Texas and the larger magnitude earthquakes that have occurred recently in nearby states has raised concerns over the seismic vulnerability of the Texas’s bridge inventory and the need for a plan of action for immediate post-earthquake response by TxDOT officials. To address these concerns, the research team developed tools to better quantify (1) the seismic hazards in the State of Texas and (2) the seismic vulnerability, or fragility, of the Texas bridge inventory. From the bridge fragility functions developed in this project, a post-earthquake action plan was proposed to identify bridges requiring inspection based on their likelihood of experiencing damage in a certain earthquake event.

8. Seismic Vulnerability and Post-Event Actions for Texas Bridge Infrastructure

Author

Texas Department of Transportation. Research and Technology Implementation Office, United States. Department of Transportation. Federal Highway Administration, Khosravikia, Farid, Potter, Anderson, Prakhov, Vyacheslav, Zalachoris, Georgios, Cheng, Tianjian, Tiwari, Ayushi, Clayton, Patricia, Cox, Brady R., Rathje, Ellen M., Williamson, Eric, Paine, Jeffrey G., Frohlich, Cliff, University of Texas at Austin. Center for Transportation Research, Texas Department of Transportation. Research and Technology Implementation Office, United States. Department of Transportation. Federal Highway Administration, Khosravikia, Farid, Potter, Anderson, Prakhov, Vyacheslav, Zalachoris, Georgios, Cheng, Tianjian, Tiwari, Ayushi, Clayton, Patricia, Cox, Brady R., Rathje, Ellen M., Williamson, Eric, Paine, Jeffrey G., Frohlich, Cliff, and University of Texas at Austin. Center for Transportation Research

Abstract

0-6916, The research investigates the seismic vulnerability of bridges in Texas by characterizing seismic hazards in the State, developing computational tools to estimate the likelihood of seismic damage to various bridge types, and providing the Texas Department of Transportation (TxDOT) tools to inform post-earthquake response planning and decision-making.

11. Site dependency of shallow seismic data quality in saturated, unconsolidated coastal sediments

Author

Paine, Jeffrey G., Morton, Robert A., and Garner, L. Edwin

Subjects
*SEISMOLOGY
Abstract

Seismic tests were conducted along the southeastern Texas coast to (1) investigate the usefulness of land-based shallow seismic reflection profiling, (2) examine the influence of environment on data quality, (3) evaluate compressional-wave sources for shallow profiling of unconsolidated sediments, and (4) determine the exploration depth rangeof shallow seismic reflection methods. Tests in three environments, including unvegetated beach, densely vegetated marsh, and densely vegetated floodplain, show that near-surface sediment characteristics strongly influence data quality. A modified soil probe hammer, which isa low-energy, broad-frequency-range seismic source, was used for theshort reflection profiles at each site. Highest quality data were collected at the beach, where reflections were recorded as shallow as 7m and as deep as 200 m. At the marsh and floodplain sites, surface wave velocities were higher, peak frequencies were lower, and exploration depths were limited. Despite similar target depths and near-surface water tables at each site, optimum acquisition parameters varied. Effects of extraneous noise associated with ambient conditions (wind,breaking waves, road traffic) were minimized with filters. Shallow sseismic reflection methods can be applied to a variety of coastal geological and environmental problems including high-resolution studies of Quaternary strata, location of active near-surface faults, and delineation of buried archeological sites. On-land seismic surveys can also augment borehole data, guide borehole placement, and extend offshore surveys across the shoreline and onto the coastal plain. [ABSTRACT FROM AUTHOR]

Published
1997

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