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Structural Engineering and Mechanics Volume 85, Number 2, January25 2023 , pages 163-177 DOI: https://doi.org/10.12989/sem.2023.85.2.163 |
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Numerical simulation by the finite element method of the constructive steps of a precast prestressed segmental bridge |
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Gabriela G. Machado, Américo Campos Filho, Paula M. Lazzari, Bruna M. Lazzari and Alexandre R. Pacheco
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| Abstract | ||
| The design of segmental bridges, a structure that typically employs precast prestressed concrete elements and the balanced cantilever construction method for the deck, may demand a highly complex structural analysis for increased precision of the results. This work presents a comprehensive numerical analysis of a 3D finite element model using the software ANSYS, version 21.2, to simulate the constructive deck stages of the New Guaiba Bridge, a structure located in Porto Alegre city, southern Brazil. The materials concrete and steel were considered viscoelastic. The concrete used a Generalized Kelvin model, with subroutines written in FORTRAN and added to the main model through the customization tool UPF (User Programmable Features). The steel prestressing tendons used a Generalized Maxwell model available in ANSYS. The balanced cantilever constructive steps of a span of the New Guaiba Bridge were then numerically simulated to follow the actual constructive sequence of the bridge. A comparison between the results obtained with the numerical model and the actual vertical displacement data monitored during the bridge's construction was carried out, showing a good correlation. | ||
| Key Words | ||
| ANSYS; balanced cantilever method; construction stages; finite element method; precast concrete; prestressed concrete; segmental bridges; UPF-User Programmable Features | ||
| Address | ||
| Gabriela G. Machado, Américo Campos Filho, Paula M. Lazzari, Bruna M. Lazzari and Alexandre R. Pacheco: Civil Engineering Graduate Program, Federal University of Rio Grande do Sul, 99 Osvaldo Aranha Ave., 90035-190, Porto Alegre, RS, Brazil | ||