Quantification of multi-hazard risk of existing RC bridges in Barak Valley region, India

The ability to assess and evaluate the condition of existing bridges adequately and accurately is a critical aspect of bridge maintenance and management, which involves condition assessments. Multiple hazards can affect existing bridges, making them vulnerable or risky, and any decision support concerning their management requires special attention. A rational and systematic framework for making practical decisions about the hazards present in a region and the appropriate level of risk is presented in this paper. An analytical hierarchy process (AHP) framework is proposed to rank hazards in hierarchical order based on a region's characteristics and a suitable analysis range, which provides the degree of risk that could jeopardise bridges. The proposed method can assist decision makers in selecting appropriate strategies for improving existing bridges. As a result, bridge inspection costs can be significantly reduced, maintenance and repair funds can be more effectively allocated and the safety, mobility, longevity and reliability of highway transportation assets can be improved. The approach was used in a case study of existing reinforced concrete (RC) bridges in the Barak Valley region in Assam, India. Such an approach is novel to the Indian subcontinent.