Evaluation of the Risk of Bridge Failure from Flood Event in Thailand

Abstract

A problem related to bridge failure from flood event is a problem that occurs globally. There
are two main methods to analyze the risk of bridge failure, i.e., hydraulic countermeasure and structure
countermeasure. There are also other recommended countermeasures, which may be suitable for the present
situation via. scour monitoring countermeasures. Nevertheless, in Thailand, the problem is specific to the
upper part of a bridge or deck. Flood water would lift up the upper part and move it away from the main
structures. Therefore, an appropriate method that should be used to evaluate the risk of bridge failure from
flood event in Thailand would be different from those in other countries. The method of evaluation should
also be easy for an evaluator and appropriate for the cost of evaluation and maintenance. Based on the
review, it is found that the Hydraulic Vulnerability Manual developed by New York State Department of
Transportation is an appropriate method with the advantage of easiness of evaluation. There is no need to
use a high technology for this method. Combination of the steps from the Hydraulic Vulnerability Manual
and the variables related to the water level proposed in the present study should be applicable to the problem
of bridge failure in Thailand.