Title: Limit analysis of masonry arch bridges through an adaptive GA-NURBS upper-bound approach

Authors: Andrea Chiozzi; Nicola Grillanda; Gabriele Milani; Antonio Tralli

Addresses: Department of Engineering, University of Ferrara, Via Saragat 1, 44122 – Ferrara, Italy ' Department of Architecture, Built Environment and Construction Engineering (A.B.C.), Technical University of Milan, Piazza Leonardo da Vinci 32, 20133 – Milan, Italy ' Department of Architecture, Built Environment and Construction Engineering (A.B.C.), Technical University of Milan, Piazza Leonardo da Vinci 32, 20133 – Milan, Italy ' Department of Engineering, University of Ferrara, Via Saragat 1, 44122 – Ferrara, Italy

Abstract: This paper investigates the application of a fast and reliable NURBS-based kinematic limit analysis approach for the assessment of the collapse behaviour of masonry bridges. This approach relies on the description of the geometry of the bridge structure by means of NURBS approximating functions. Starting from the known geometry, an assembly of rigid bodies can be generated, composed by very few elements which still provide an exact representation of the original geometry. The main properties of masonry material are accounted for through homogenisation and an upper-bound formulation for the limit analysis of the obtained mesh is devised. The approach is capable of accurately predicting the load bearing capacity of masonry bridges with arbitrary geometry and load configuration, provided that the initial mesh is adjusted by means of a suitably meta-heuristic approach (i.e., a genetic algorithm) until element edges correctly approximate the actual yield lines of the collapse mechanism.

Keywords: masonry bridges; NURBS; limit analysis; genetic algorithms; GAs.

DOI: 10.1504/IJMRI.2020.111796

International Journal of Masonry Research and Innovation, 2020 Vol.5 No.4, pp.538 - 552

Received: 04 Jan 2019
Accepted: 26 Mar 2019
Published online: 15 Dec 2020 *

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