Effect of near-fault earthquake on bridges: lessons learned from Chi-Chi
earthquake
Chin-Hsiung Loh1, Wen-I Liao2, and Juin-Fu Chai2
Abstract: The objective of this paper is to describe the lessons
learned and actions that have been taken related to the seismic design of bridge
structures after the Chi-Chi, Taiwan earthquake. Much variable near-fault ground
motion data was collected from the rupture of Chelungpu fault during the Chi-Chi
earthquake, allowing the seismic response of bridge structures subjected to
these near-fault ground motions to be carefully examined. To study the
near-fault ground motion effect on bridge seismic design codes, a two-level
seismic design of bridge structures was developed and implemented. This design
code reflects the near-fault factors in the seismic design forces. Finally, a
risk assessment methodology, based on bridge vulnerability, is also developed to
assist in decisions for reducing seismic risk due to failure of bridges.
Keywords: Chi-Chi earthquake; near-fault; bridge seismic design; risk
assessment
