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SUMMARY:Modelling Strategies for Accurate Assessment of Masonry Arch Bridg
 es  - Lorenzo Macorini
DTSTART:20240614T140000Z
DTEND:20240614T150000Z
UID:TALK217834@talks.cam.ac.uk
CONTACT:Callum White
DESCRIPTION:This lecture presents multi-level FE modelling strategies deve
 loped within the Computational \nStructural Mechanics group at Imperial Co
 llege London for nonlinear simulation of masonry \nbridges. Most masonry b
 ridges and viaducts were built more than a century ago and are still in us
 e\, \nrepresenting critical components of roadway and railway infrastructu
 re systems in different \ncountries worldwide. Material deterioration and 
 increased traffic loading have led to the \nprogressive development of dam
 age and cracking in the brick/blockwork\, potentially leading to \nsubstan
 dard performance. Accurate assessment is required to evaluate structural s
 afety and guide \nthe implementation of effective strengthening measures. 
 It should be based on a realistic \nrepresentation of the complex interact
 ion among the components\, including arch barrel\, spandrel \nwalls\, back
 fill and piers in multi-span bridges. The developed 3D and 2D mesoscale an
 d \nmacroscale models for masonry bridges are based on different scales of
  representation to model \nmaterial nonlinearity in masonry. Backfill mate
 rials are modelled by elastoplastic continuum \ndescriptions\, allowing fo
 r their inherent cohesive and frictional characteristics. At the same time
 \, \nthe physical interfaces between the different masonry parts and the b
 ackfill are represented by \nnonlinear interfaces\, enabling separation an
 d sliding between the connected parts. Detailed \nmesoscale models enable 
 separate descriptions for masonry units and mortar joints\, providing a \n
 high-fidelity representation of the material response and incorporating ex
 isting damage and \ncracking. More efficient macroscale models guarantee a
  reduced computational cost. They still \nallow for the typical 3D respons
 e of masonry bridges but require detailed calibration of the model \nmater
 ial parameters. Numerical examples comprising comparisons against the resu
 lts from \nphysical experiments on full-scale specimens and monitoring dat
 a on realistic bridges are presented \nto critically appraise the develope
 d multi-level modelling strategies for masonry arch bridges.
LOCATION:CivEng Seminar Room (1-33) (Civil Engineering Building)
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