Modelling with fibre beam elements for load capacity assessment of existing masonry arch bridges
- 1. Michelangelo Laterza, Michele D’Amato, Vito Michele Casamassima, Michele Signorelli OPENSEES DAYS EUROPE FIRST EUROPEAN CONFERENCE ON OPENSEES 19-20 JUNE 2017 PORTO, PORTUGAL MODELLING WITH FIBRE BEAM ELEMENTS FOR LOAD CAPACITY ASSESSMENT OF EXISTING MASONRY ARCH BRIDGES
- 2. Michelangelo Laterza, Michele D’Amato, Vito Michele Casamassima, Michele Signorelli OBJECTIVES The aim of this work is to propose a preliminary approach for the assessment of the ultimate capacity of multi-span masonry arch bridge. Non linear beam elements with fiber section approach has been adopted for modelling the arches An application to a case study “Cavone Bridge”: an Italian old masonry arch bridge
- 3. Michelangelo Laterza, Michele D’Amato, Vito Michele Casamassima, Michele Signorelli Masonry arch bridges represent an invaluable architectural and cultural heritage and often assume an important strategic role. One of the actual engineering challenge is the conservation of old masonry arch bridges built in the last centuries. Railway arch bridge Pedestrian arch bridge Road arch bridge Railway arch bridge Introduction
- 4. Michelangelo Laterza, Michele D’Amato, Vito Michele Casamassima, Michele Signorelli Most of them nowadays are located along important roads characterized by transit loads heavier and more frequent than the ones of past. Masonry arch bridges were designed without considering any lateral force and, consequently, to date they result very vulnerable in areas with high earthquake intensity zones. Very often, the materials is deteriorate due to the cyclic vertical loads and weathering conditions. Critical issues
- 5. Michelangelo Laterza, Michele D’Amato, Vito Michele Casamassima, Michele Signorelli Methods of load carrying capacity assessment METHODS FOR THE STRUCTURAL ANALISYS MATHEMATICAL MODEL PHYSICAL MODEL THEORETICAL BASES LABORATORY ON- SITE TESTS ANALYTIC METHODS EMPIRICAL METHODS Mechanism Method (Ring) Finite Element Method Thrust Line Analysis (Archie-M) Elasto-Plastic Model
- 6. Michelangelo Laterza, Michele D’Amato, Vito Michele Casamassima, Michele Signorelli Case study: Cavone Bridge Main arch Secondary arch The bridge has four secondary arches of 10 m span length, and three main arches of 22 m span length. The three main arches are supported by two piers falling into the riverbed, with a total height from the foundation plane of about 24 m, of which 14 m are outside the riverbed. Multi span masonry arch bridge with an overall length of 140 m and a width of 5.6 m.
- 7. Michelangelo Laterza, Michele D’Amato, Vito Michele Casamassima, Michele Signorelli 7 i. Define ndm & ndf ii. Define nodes iii. Define elements(s) iv. Define material(s) v. Define boundary conditions i. Define matrix transormation i. Apply load ii. Define recorders iii. Define analysis iv. objects v. Run the analysis Numerical model of the arches: steps to be followed
- 8. Michelangelo Laterza, Michele D’Amato, Vito Michele Casamassima, Michele Signorelli 8 Numerical model fiber beam section Constitutive model for C-FRP δ Segmental arch structure Fiber beam sectionConstitutive model for masonry P S = KpPFtanα
- 9. Michelangelo Laterza, Michele D’Amato, Vito Michele Casamassima, Michele Signorelli Mainarch Pushover curves
- 10. Michelangelo Laterza, Michele D’Amato, Vito Michele Casamassima, Michele Signorelli
- 11. Michelangelo Laterza, Michele D’Amato, Vito Michele Casamassima, Michele Signorelli Conclusions An approach for a preliminary estimate of the load-carrying capacity of masonry arch bridges has been presented and applied to an ancient italian masonry arch bridge. One of the advantages of the proposed approach is that it makes use of available general-purpose engineering software, having recourse to analysis methods accepted and widely used in other fields of structural engineering and consistent with the philosophy of modern design and assessment codes. In conclusion, the paper makes a contribution towards the development of analysis tools for assessing and preserving existing masonry arch bridge.
- 12. Michelangelo Laterza, Michele D’Amato, Vito Michele Casamassima, Michele Signorelli Thank you …