Extension of displacement‐based simplified procedures to the seismic loss assessment of multi‐span RC bridges

Abstract

Simplified seismic assessment procedures relying on displacement‐based formulations have recently been implemented for the evaluation of the seismic performance in buildings and bridges. For bridges, displacement‐based assessment procedures have been formulated to predict the displacement response at several performance levels defined based on the expected damage on the structural elements. These displacement profiles have been subsequently used to estimate the performance level achieved under a given seismic hazard intensity and to develop damage fragility curves. For buildings, these concepts have been extended to compute economic losses in agreement with current performance‐based earthquake engineering procedures. In this study, existing displacement‐based formulations for the approximate seismic assessment of single‐column multi‐span continuous RC bridges, with non‐sacrificial shear keys for the pier‐to‐deck connections, are extended for the computation of expected annual losses under transverse direction excitation. Additionally, an iterative response spectrum analysis procedure, which directly considers higher mode effects, is proposed for computing the displacement response, and these results are also used to estimate direct expected annual losses. Results show that both procedures tend to compute higher losses when compared with those obtained with a fully probabilistic loss assessment framework, using demand estimations computed with nonlinear response history analysis. Results also show that the simplified loss assessment procedure is highly sensitive to the definition of the collapse fragility curve.

Loss-Based Seismic Prioritisation of Existing Rc Girder Bridges

“…The dispersion of DCR values around the median is computed (𝛽 𝐷𝐶𝑅 𝐷𝑆 |𝐼𝑀 ) via Equation (7), where M is the number of ground motions, and assumed constant for each IM value.…”

“…This latter requires significant computational efforts resulting hardly applicable within a risk prioritisation framework considering a relevant number of structures. Perdomo et al [7] focus on the development of a component-level efficient displacement-based approach for economic loss assessment of continuous-deck bridges. Other simplified loss assessment approaches do not consider component-level contributions, but calculate economic losses based on a structure-level probability of damage.…”

Effects of Web Height Reduction and Skew Angle Variation on Behavior of RC Inverted T-Beams

“…Lately, there have been proposed studies centering on structure-specific methods. Examples of these methods are the simplified displacement-based assessment (DBA) methods that were recently proposed, tested, and refined for multi-span continuous girder RC bridges by Perdomo and Monteiro [27].…”

Simplified Fragility Analysis of Multi-Span Isostatic Rc-Bridges Considering an Incomplete Knowledge Level

“…Among them, simplified displacement-based assessment (DBA) algorithms are proposed and tested. Sadan et al [11] proposed a simplified DBA approach for multi-span continuous girder RC bridges, which is recently refined by Gentile et al [12,13] and Perdomo et al [14]. Cardone [15] proposed displacement-based damage state thresholds for bridge components to be used within the DBA algorithm.…”