Application of probabilistic and multiple-criteria techniques in evaluating alternative reinforcement materials for increasing bridge deck life

Ashish Samdariya, Purdue University

Abstract

The efficient management of existing highway bridge infrastructure has become a major social and economic challenge in the United States, particularly in this era that is characterized by aging infrastructure and limited funding for repair and reconstruction. Recognizing that the bridge deck is the most vulnerable component of a bridge, engineers constantly seek cost-effective preservation strategies that yield minimal repair frequency and intensity over the deck life and, ultimately, the least life cycle cost. Traditionally, most bridge preservation decisions have been largely subjective in nature, thus jeopardizing the optimal selection of bridge design and preservation strategies in systematic manner. This research presents a decision support methodology and software solution for a robust analysis of cost-effectiveness of alternative material types for bridge deck reinforcement. The methodology incorporates Monte Carlo simulation techniques that account for the probabilistic nature of the input variables and includes agency and user costs and the deck service life. Engineering economic analyses and Analytical Hierarchical Process techniques are used, together with appropriate weights for the agency and user costs to identify the best alternative material. The study methodology is demonstrated using a case study involving bridge deck reinforcement alternatives of epoxy-coated steel, zinc-clad steel, and stainless steel. On the basis of the multiple criteria considered, the stainless and zinc-clad steels have superior overall long-term performance. It is shown that using corrosion-resistant reinforcing materials can reduce preservation cost and thus lower long-term funding needs.

Degree

M.S.C.E.

Advisors

Labi, Purdue University.

Subject Area

Civil engineering

COinS