Steel and Composite Structures

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A numerical model for the long-term service analysis of steel-concrete composite beams regarding construction stages: Case study

  • Marcela P. Miranda (Center of Applied Mechanics and Computational (CEMACOM,) Engineering School of Federal University of Rio Grande do Sul) ;
  • Jorge L. P. Tamayo (Department of Civil Engineering, Engineering School Federal University of Rio Grande do Sul) ;
  • Inacio B. Morsch (Department of Civil Engineering, Engineering School Federal University of Rio Grande do Sul)
  • Received : 2024.02.09
  • Accepted : 2024.07.08
  • Published : 2024.07.25
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Abstract

The Caynarachi Bridge is a 130 m long posttensioned steel-concrete composite bridge built in Peru. The structural performance of this bridge under construction loads is reviewed in this paper using numerical simulation. Hence, a numerical model using shell finite elements to trace its deformational behavior at service conditions is proposed. The geometry and boundary conditions of the superstructure are updated according to the construction schedule. Firstly, the adequacy of the proposed model is validated with the field measurements obtained from the static truck load test. Secondly, the study of other scenarios less explored in research are performed to investigate the effect of some variables on bridge performance such as time effects, sequence of execution of concrete slabs and type of supports conditions at the abutments. The obtained results show that the original sequence of execution of the superstructure better behaves mechanically in relation to the other studied scenarios, yielding smaller stresses at critical cross sections with staging. It is also demonstrated that an improper slab staging may lead to more critical stresses at the studied cross sections and that casting the concrete slab at the negative moment regions first can lead to an optimal design. Also, the long-term displacements can be accurately predicted using an equivalent composite resistance cross section defined by a steel to concrete modulus ratio equal to three. This article gives some insights into the potential shortcomings or advantages of the original design through high-fidelity finite element simulations and reinforces the understating of posttensioned composite bridges with staging.

Keywords

Acknowledgement

The CNPq and CAPES are acknowledged for funding the first author's PhD scholarship.

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