An Inspection and Evaluation of Fire Damaged on the Expressway Structures for Planning Structural Repairs

Abstract

In recent decades, fire incidents occurred on the expressway structures have caused considerable damages. The Expressway Authority of Thailand (EXAT) in collaboration with qualified structural inspectors have investigated and evaluated the damage on the element of expressway structure in order to create effective plans for repairing to ensure that the structures are safe and ready in service. This article studies about the guideline to inspection and evaluation damage of the overpass structures that affected from the fire incidents at the part of cantilever decks and box girders. The inspection of structural damaged level and the evaluation have applied the preliminary physical survey by visual inspection and the insight analysis of a structural engineering survey. The insight analysis of a structural engineering survey consists of an inspection of concrete compressive strength by using a nondestructive test, an inspection of concrete deterioration (acidity–alkalinity), reinforcement corrosion inspection, and inspection of tensile values of the pre-stressed tendon inside the box girder segment. The results of various investigations will be used to indicate the level of damage and to provide effective repair and maintenance plans for the expressway structures to ensure their stability