A Survey of Bridge Practitioners to Relate Damage to Closure
Title: A Survey of Bridge Practitioners to Relate Damage to Closure
Archive: Earthquake Engineering
Author(s): Porter, Keith A.
Abstract: The Pacific Earthquake Engineering Research (PEER) Center?s second-generation performance-based earthquake engineering (PBEE) methodology is intended in part to model highway bridge performance in terms of collapse, closure, repair duration, speed or load limitations, and possibly other performance measures. Some of these are difficult to model, particularly closure decisions where the engineering evidence of safety is inconclusive and must be supplemented by the inspector?s judgment. This paper presents results of a limited, initial survey of department of transportation (DOT) engineers? beliefs about the relationship between physical damage and closure. The initial survey addresses a common class of reinforced-concrete bridges. The author and others developed and administered to a select, nationwide group of DOT engineers a one-page, multiple-choice survey form with expert self-rating, asking the engineers to relate ten damage measures (DM) to four closure levels. The DMs include approach settlement, offsets at abutments and expansion joints, flexural and shear cracks in beams, columns, shear keys, and backwalls. The performance levels considered are: leave open, close briefly for quick repairs, close for an extended period, and reduce speed. The survey results are analyzed to produce a number of preliminary relationships between damage and post-earthquake decisions by inspectors, relationships that can be used in probabilistic seismic performance evaluation in PEER?s developing PBEE methodology. This preliminary test of a survey form also yielded insight into a number of desirable improvements for a second round of survey, possibly to be administered via the Internet early in 2004.
Discipline(s): Earthquake Engineering Research Laboratory
Publisher: Earthquake Engineering Research Laboratory