PSI - Issue 18

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 18 (2019) 891–902

25th International Conference on Fracture and Structural Integrity Structural integrity of tied arch bridges affected by instability phenomena Fabrizio Greco*, Paolo Lonetti, Arturo Pascuzzo a Department of Civil Engineering, University of Calabria, Via P. Bucci, Cubo39B, 87030, Rende, Cosenza, Italy Abstract A numerical study is developed to investigate out-of-plane buckling instability of tied arch bridges due to vertical loads. In particular, a numerical model is implemented to evaluate initial configuration under dead loads and nonlinearities due to nonlinear geometric effects in bridge components arising from instability phenomena. The main aim of the paper is to identify the most relevant bridge components, which are affected out-of-plane instability behavior of the structure. The nonlinear behavior of tied arch bridges is evaluated by means of a three-dimensional finite element model, in which several wind bracing system layouts and cable system configurations are considered. A comparative analysis between Elastic Buckling Analysis and Nonlinear Elastic Analysis methodologies is developed to achieve a more accurate evaluation of the maximum capacity of the structure against instability phenomena. Comparisons in terms of buckling assessment between numerical evaluations and simplified methodologies reported in current codes on bridge structures are proposed. Results show that the simplified methodologies overestimate the instability capacity in most of the bridge configurations, which have been dimensioned according to the preliminary design rules commonly adopted in current applications. 25th International Conference on Fracture and Structural Integrity Structural integrity of tied arch bridges affected by instability phenomena Fabrizio Greco*, Paolo Lonetti, Arturo Pascuzzo a Department of Civil Engineering, University of Calabria, Via P. Bucci, Cubo39B, 87030, Rende, Cosenza, Italy Abstract A numeric l study is developed to investigate out-of-plane buckling instability of tied rch bridges due to vertical l ads. In particular, a numerical model is implemented to evaluate initial configuration und r dead loads and nonlinearities due to nonlinear geometric effects in bridge components arising from instability phenom na. The main aim of the paper is to identify the most relevant bridge components, which are aff cted out-of-plane instability behavior of the structure. The nonlinear b havior of tie arch bridg s is evaluated by means of a three-dimension l finite element model, in which several wi d bracing system layouts and cable system configurations ar considered. A comparative analysis between Elastic Buckling Analysis and Nonlinear El stic Analysis methodologies is devel ped to achieve a more accurat evaluation of the maxim m cap city of the structure against instability phenomena. Comparisons in terms of buckling assessment between numerical evaluations and simplified methodologies reported in current codes on bridge stru tures are proposed. Results show that the simplified methodologies overestimate the instability capacity i most of the bridge configurations, which have been dimensioned according to the preliminary design rules commonly adopted in current applications.

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. Keywords: Tied arch bridges; Buckling; Finite Element Method; Nonlinear Analysis; Keywords: Tied arch bridges; Buckling; Finite Element Method; Nonlinear Analysis;

* Corresponding author. Tel.: +39-0984-496916; E-mail address: fabrizio.greco@unical.it * Corresponding author. Tel.: +39-0984-496916; E-mail address: fabrizio.greco@unical.it

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo.

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 10.1016/j.prostr.2019.08.240