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Performance-based concept on seismic evaluation of
existing bridges
Yu-Chi Sung1 , Wen-I Liao 1and W.Phillip Yen
2
1. Department of Civil Engineering, Taipei University of Technology,
Taipei 10608, Chinese Taipei
2. Office of Infrastructure, R&D, Federal Highway Administration, 6300
Georgetown Pike, McLean, VA 20121, USA
Abstract: Conventional seismic evaluation of existing bridges
explores the ability of a bridge to survive under significant earthquake
excitations. This approach has several major drawbacks, such as only a
single structural performance of near collapse is considered, and the
simplified approach of adopting strength-based concept to indirectly
estimate the nonlinear behavior of a structure lacks accuracy. As a
result, performance-based concepts that include a wider variety of
structural performance states of a given bridge excited by different
levels of earthquake intensity is needed by the engineering community.
This paper introduces an improved process for the seismic evaluation of
existing bridges. The relationship between the overall structural
performance and earthquakes with varying levels of peak ground
acceleration (PGA) can successfully be linked. A universal perspective
on the seismic evaluation of bridges over their entire life-cycle can be
easily obtained to investigate
multiple performance objectives. The accuracy of the proposed method,
based on pushover analysis, is proven in a case study that compares the
results from the proposed procedure with additional nonlinear time
history analyses.
Keywords: pushover analysis; plastic hinge; seismic capacity;
seismic demand; performance-based concepts
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