Influence of model parameter uncertainty on seismic transverse response and vulnerability of steel-concrete composite bridges with dual load path

TY - JOUR

T1 - Influence of model parameter uncertainty on seismic transverse response and vulnerability of steel-concrete composite bridges with dual load path

AU - Tubaldi, E.

AU - Barbato, M.

AU - Dall'Asta, A.

N1 - cited By 16

PY - 2012/3

Y1 - 2012/3

N2 - This paper uses a fully probabilistic approach to investigate the seismic response of multispan continuous bridges with dissipative piers and a steel-concrete composite (SCC) deck, the motion of which is transversally restrained at the abutments. This bridge typology is characterized by complex dual load path behavior in the transverse direction, with multiple failure modes involving both the deck and the piers. Proper assessment of the seismic vulnerability of these structural systems must rigorously take into account all pertinent sources of uncertainty, including uncertainties in both the seismic input (record-to-record variability) and the properties defining the structural model (model parameters). Model parameter uncertainty affects not only the structural capacity, but also the seismic response of a structural system. However, most of the procedures for seismic vulnerability assessment focus on the variability of the response resulting solely from seismic input uncertainty. These procedures either neglect model parameter uncertainty effects or incorporate these effects only in a simplified way. A computationally expensive but rigorous procedure is introduced in this work to include the effects of model parameter uncertainty on the seismic response and vulnerability assessment of SCC bridges with dual load path. Monte Carlo simulation with Latin hypercube sampling, in conjunction with probabilistic moment-curvature analysis, is used to build probabilistic finite-element models of the bridges under study. Extended incremental dynamic analysis is used to propagate all pertinent sources of uncertainty to the seismic demand. The proposed pro-cedure is then applied to the assessment of three benchmark bridges exhibiting different seismic behavior and dominant failure modes. Comparison of the response variability induced by seismic input uncertainty and the response variability induced by model parameter un-certainty highlights the importance of accounting for the latter when evaluating the safety of the typology of bridges considered in this study.

AB - This paper uses a fully probabilistic approach to investigate the seismic response of multispan continuous bridges with dissipative piers and a steel-concrete composite (SCC) deck, the motion of which is transversally restrained at the abutments. This bridge typology is characterized by complex dual load path behavior in the transverse direction, with multiple failure modes involving both the deck and the piers. Proper assessment of the seismic vulnerability of these structural systems must rigorously take into account all pertinent sources of uncertainty, including uncertainties in both the seismic input (record-to-record variability) and the properties defining the structural model (model parameters). Model parameter uncertainty affects not only the structural capacity, but also the seismic response of a structural system. However, most of the procedures for seismic vulnerability assessment focus on the variability of the response resulting solely from seismic input uncertainty. These procedures either neglect model parameter uncertainty effects or incorporate these effects only in a simplified way. A computationally expensive but rigorous procedure is introduced in this work to include the effects of model parameter uncertainty on the seismic response and vulnerability assessment of SCC bridges with dual load path. Monte Carlo simulation with Latin hypercube sampling, in conjunction with probabilistic moment-curvature analysis, is used to build probabilistic finite-element models of the bridges under study. Extended incremental dynamic analysis is used to propagate all pertinent sources of uncertainty to the seismic demand. The proposed pro-cedure is then applied to the assessment of three benchmark bridges exhibiting different seismic behavior and dominant failure modes. Comparison of the response variability induced by seismic input uncertainty and the response variability induced by model parameter un-certainty highlights the importance of accounting for the latter when evaluating the safety of the typology of bridges considered in this study.

KW - incremental dynamic analysis

KW - nonlinear finite element method

KW - performance-based earthquake engineering

KW - seismic behavior

KW - steel concrete composite structures

KW - composite bridges

KW - model structures

KW - monte Carlo methods

KW - piers

KW - seismic response

KW - soil structure interactions, Finite element method

UR - https://www.scopus.com/inward/record.uri?eid=2-s2.0-84867266785&doi=10.1061%2f%28ASCE%29ST.1943-541X.0000456&partnerID=40&md5=a22bf3d7b6d58da4368e9ab51734fc31

U2 - 10.1061/(ASCE)ST.1943-541X.0000456

DO - 10.1061/(ASCE)ST.1943-541X.0000456

M3 - Article

VL - 138

SP - 363

EP - 374

JO - Journal of Structural Engineering

T2 - Journal of Structural Engineering

JF - Journal of Structural Engineering

SN - 0733-9445

IS - 8

ER -