A New PGD Model for Bridge Damage Assessment

A New PGD Model for Bridge Damage Assessment

This report briefly describes a new Permanent Ground Displacements(PGD) model for seismic damage assessment of bridges. Based on the experience of the 921 earthquake disaster, it was found that PGD from fault rupture seriously impacts bridges. Therefore, the method of estimating PGD near fault rupture is an important component in seismic assessment of bridge damage. The model consists of three formulas as follows:(1) Permanent Ground Displacements,(2) Encounter Probability, and(3) Relation Position. The new model has been implemented as a new kernel assessment module for the sub-system of Taiwan Earthquake Loss Estimation System(T-Highway) in 2014. For the verification of the PGD model, the T-Highway has been adopted to assess bridge damage in the Chi-Chi earthquake scenario. The new T-Highway has also been applied to the seismic risk and retrofit order of the highway bridges. Administration is progressing retrofit projects in order to upgrade the seismic capacity of highway bridges. The retrofit projects include 1169 bridges in 2014. This report will first describe the model and the validation of it. Finally, applications of the model will be described.