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Numerical simulations for the design of real structures

Keywords: steel structures, falling rock protection barriers, leakage in cracked pipes, ceramic sanitary ware, guided waves
Fig. 1. Global, distortional and local buckling of a thin-walled beam (de Miranda).
Fig. 2. Numerical simulation of the concrete block impact on a rockfall barrier (Gentilini).
Fig. 3. Modelling of ceramic sanitary wares (Patruno).

This research line encompasses the application of advanced computational tools for the analysis and design of real structures. The current research activities address a wide range of issues, including:

  • linear and nonlinear structural analysis of thin walled beams, with emphasis for coldformed steel members, in which local phenomena such as section distortion require the use of beam models with enriched kinematics or three-dimensional shell models;
  • numerical strategies for the design and verification of flexible falling rock barriers: passive protection measures for risk mitigation of potentially unstable rock slopes. Developed dynamic models are simple and produce an accurate prediction of all the relevant parameters for barrier design, such as anchorage forces, net panel elongations and residual heights;
  • modelling of ceramic sanitary ware deformations during the production process;
  • analysis of the effects of permanent ground deformation on underground and above ground pipe networks;
  • analysis of waveguides dispersive properties;
  • models to evaluate the influence of the deformability of a cracked pressurized pipe on leakage, with a focus on losses due to longitudinal splits. The purpose is to evaluate the opening area (leak area), while keeping the model as simple as possible;
  • nonlinear analysis of masonry structures;
  • modelling of tiles debonding due to shrinkage: substrate shrinkage or temperature variations can produce differential elongation/ shortening between tiles and substrate. Consequently the tiling failure like mode I mechanism can occur.

Main publications

de Miranda, S., Gentilini, C., Gottardi, G., Govoni, L., Mentani, A., Ubertini, F. (2015) Virtual testing of existing semi-rigid rockfall protection barriers, Engineering Structures, 85, 83-94.

de Miranda S., Madeo A., Melchionda D., Ubertini F. (2015) A high performance flexibilitybased GBT finite element, Computers and Structures, 158, 285-307.

Zagari G., Madeo A., Casciaro R., de Miranda S., Ubertini F. (2013) Koiter analysis of folded structures using a corotational approach, International Journal of Solids and Structures, 50, 755-765.

de Miranda S., Patruno L., Ricci M., Ubertini F. (2015) Numerical study of a twin box bridge deck with increasing gap ratio by using RANS and LES approaches, Engineering Structures, 99, 546-558.

de Miranda, S., Patruno, L., Ricci, M., Saponelli, R., Ubertini, F. (2015) Ceramic sanitary wares: Prediction of the deformed shape after the production process, Journal of Materials Processing Technology, 215, 309-319.

Gottardi, G., Govoni, L., Mentani, A., Gentilini, C., Ubertini, F. (2014) Modelling for the design of passive protection measures against rock fall, Physical Modelling in Geotechnics - Proceedings of the 8th International Conference on Physical Modelling in Geotechnics 2014, ICPMG 2014, 2, 1179-1185.

de Miranda, S., Molari, L., Scalet, G., Ubertini, F. (2014) A physically-based analytical relationship for practical prediction of leakage in longitudinally cracked pressurized pipes, Engineering Structures, 79, 142-148.

Castellazzi G. (2012) Analysis of second-order shear-deformable beams with semi-rigid connections, Journal of Constructional Steel Research, 79, 183-194.

Castellazzi G., de Miranda S., Mazzotti C. (2012) Finite element modelling tuned on experimental testing for the structural health assessment of an ancient masonry arch bridge, Mathematical Problems in Engineering, art. no. 495019.

Gentilini C., Govoni L., de Miranda S., Gottardi G., Ubertini F. (2012). Three-dimensional numerical modelling of falling rock protection barriers. Computers and Geotechnics 44, 58-72.

Gentilini C., Gottardi G., Govoni L., Mentani A., Ubertini F. (2013) Design of falling rock protection barriers using numerical models, Engineering Structures, 50, 96-106.

Bocchini P., Marzani A. and Viola E. (2010), A Graphical User Interface for guided acoustic waves, Journal of Computing in Civil Engineering 25, 202-210.

de Miranda, S., Madeo, A., Miletta, R., Ubertini, F. (2014) On the relationship of the shear deformable Generalized Beam Theory with classical and non-classical theories, International Journal of Solids and Structures, 51, 3698-3709.

de Miranda S., Molari L., Scalet G., Ubertini F. (2010). Leakage evaluation in longitudinally cracked pressurized pipes. 4th International Conference on Structural Engineering, Mechanics and Computation - SEMC, September 6-8, Cape Town.

de Miranda S., De Rosis A., Fantuzzi N., Patruno L., Ubertini F. (2011). Progettazione integrata di stampi per sanitari ceramici. XX Congresso dell'Associazione Italiana di Meccanica Teorica e Applicata - AIMETA2011, September 12-15, Bologna.

Research projects

Smart Manufacturing 2020 (2015-2016), Cluster Tecnologici Nazionali (www.fabbricaintelligente.it). UniBO coordinator: S. de Miranda.