Design for Lateral Loads/Systems

Single Abstract

343735 - Evaluation of the ASCE 41 Tier-1 Procedure and a New Collapse-Assessment Triage Method using Buildings Damaged in the 2016 Southern Taiwan Meinong Earthquake.

Friday, April 20
11:00 AM - 12:30 PM
Location: 202B

The Magnitude- 6.4 Meinong Earthquake struck the Southern region of Taiwan in February 2016. The earthquake resulted in damage to reinforced concrete buildings. The majority of these buildings had a reinforced concrete frame as the primary lateral-load resisting system. The most common damage mechanism was a soft story resulting from shear and/or flexural-shear damage to the first-story columns. A study was undertaken to use these buildings to investigate the accuracy of the ASCE 41 Tier 1 evaluation procedure in determining the buildings as vulnerable to earthquake damage. The results were mixed with the primary shortcomings of the procedure being that (1) the shear strength of the columns is overestimated and (2) the beam-to-column strength ratio, indicating the likelihood of a soft-story mechanism is too low. The second phase of the research used a new evaluation procedure to evaluate selected buildings. This new evaluation procedure is being developed under the direction of NIST through ATC and is part of a new procedure developed specifically for the Los Angeles region to identify collapse vulnerable RC buildings. The procedure uses more sophisticated estimates of strength and deformation limits with explicit determination of the base-shear capacity through an assumed plastic mechanism. The results of this study will be presented using selected buildings that sustained severe damage and partial collapse.

Dawn E. Lehman

Professor
University of Washington

Dawn Lehman is a Professor of Civil and Environmental Engineering at the University of Washington. Her research expertise lies in seismic engineering of structural systems (http://www.ce.washington.edu/people/faculty/faculty.php?id=24).
She has conducted research on a range of systems including reinforced concrete walls and frames, steel braced frames, and concrete-filled-tube, precast and reinforced-concrete bridge systems. Her research results have been implemented in codes, design manuals and provisional structural engineering recommendations, including AASHTO, AISC, WSDOT BDM, Caltrans SDM, and ASCE 41. She has authored over 120 research articles. (Many are available on Research Gate https://www.researchgate.net/profile/Dawn_Lehman).

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343735 - Evaluation of the ASCE 41 Tier-1 Procedure and a New Collapse-Assessment Triage Method using Buildings Damaged in the 2016 Southern Taiwan Meinong Earthquake.



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