Seismic vulnerability prediction of masonry aggregates: Iterative Finite element Upper Bound limit analysis approximating no tensile resistance
•3D FE Upper Bound Limit Analysis approach for masonry aggregates.•Detection of global and partial mechanisms modelling the entire structure with 3D elements.•Dissipation on quadrilateral interfaces between adjoining infinitely resistant hexahedrons.•Application on two masonry aggregates stricken by...
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Published in | Engineering structures Vol. 293; p. 116595 |
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Main Authors | , |
Format | Journal Article |
Language | English |
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Elsevier Ltd
15.10.2023
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Abstract | •3D FE Upper Bound Limit Analysis approach for masonry aggregates.•Detection of global and partial mechanisms modelling the entire structure with 3D elements.•Dissipation on quadrilateral interfaces between adjoining infinitely resistant hexahedrons.•Application on two masonry aggregates stricken by recent Italian seismic events.•Iterative procedure based on the shrinkage of the frictional-cohesive failure surface to zero.
A novel 3D Finite Element Upper Bound limit analysis approach for the evaluation of the seismic vulnerability of masonry aggregates when the collapse may occur both locally and globally is presented.
The model relies on a 3D discretization of the aggregate by means of infinitely resistant hexahedron elements and rigid plastic quadrilateral interfaces, where all plastic dissipation occurs.
The interface behavior is assumed isotropic, with friction, cohesion, and tension cutoff. The collapse horizontal acceleration is obtained in the discretized model solving large-scale linear programming problems with standard numerical routines. According to a consolidated literature, the vulnerability prediction should be done with pre-assigned failure mechanisms formed by large macro-blocks mutually roto-translating, and assuming a material unable to withstand tensile stresses without mutual sliding between macro-blocks. However, such assumptions may be responsible for an overestimation of the load-carrying capacity and the determination of a realistic mechanism is neither obvious nor possible in any case. Discretizing the aggregate into 3D elements and interfaces, the failure mechanism is automatically found in the solution of the limit analysis problem, but enforcing the no-tension material hypothesis may be responsible for the activation of parasite sliding between contiguous elements or stalling issues of the numerical algorithm. In the first case, the failure mechanism changes considerably and the computational evaluation of the horizontal acceleration at collapse can be affected by unsafe inaccuracy.
The present approach iteratively approximates the no-tension material model at low computational cost, progressively shrinking the failure surface and evaluating (i) collapse accelerations, (ii) failure mechanisms active, (iii) power dissipated on interfaces and (iv) power expended by loads not dependent on the collapse multiplier. By analyzing the failure mechanisms obtained, it is possible to select where spurious sliding is not dominant. Enforcing to zero the power dissipated on interfaces it is possible to estimate the collapse multiplier corresponding to the twofold assumption that (i) parasite sliding is negligible and (ii) the material approximates in a technically acceptable way the no-tension one.
The model is first benchmarked on a masonry portal, where a reference solution is available, and then applied to two historical aggregates located in Italy. |
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AbstractList | •3D FE Upper Bound Limit Analysis approach for masonry aggregates.•Detection of global and partial mechanisms modelling the entire structure with 3D elements.•Dissipation on quadrilateral interfaces between adjoining infinitely resistant hexahedrons.•Application on two masonry aggregates stricken by recent Italian seismic events.•Iterative procedure based on the shrinkage of the frictional-cohesive failure surface to zero.
A novel 3D Finite Element Upper Bound limit analysis approach for the evaluation of the seismic vulnerability of masonry aggregates when the collapse may occur both locally and globally is presented.
The model relies on a 3D discretization of the aggregate by means of infinitely resistant hexahedron elements and rigid plastic quadrilateral interfaces, where all plastic dissipation occurs.
The interface behavior is assumed isotropic, with friction, cohesion, and tension cutoff. The collapse horizontal acceleration is obtained in the discretized model solving large-scale linear programming problems with standard numerical routines. According to a consolidated literature, the vulnerability prediction should be done with pre-assigned failure mechanisms formed by large macro-blocks mutually roto-translating, and assuming a material unable to withstand tensile stresses without mutual sliding between macro-blocks. However, such assumptions may be responsible for an overestimation of the load-carrying capacity and the determination of a realistic mechanism is neither obvious nor possible in any case. Discretizing the aggregate into 3D elements and interfaces, the failure mechanism is automatically found in the solution of the limit analysis problem, but enforcing the no-tension material hypothesis may be responsible for the activation of parasite sliding between contiguous elements or stalling issues of the numerical algorithm. In the first case, the failure mechanism changes considerably and the computational evaluation of the horizontal acceleration at collapse can be affected by unsafe inaccuracy.
The present approach iteratively approximates the no-tension material model at low computational cost, progressively shrinking the failure surface and evaluating (i) collapse accelerations, (ii) failure mechanisms active, (iii) power dissipated on interfaces and (iv) power expended by loads not dependent on the collapse multiplier. By analyzing the failure mechanisms obtained, it is possible to select where spurious sliding is not dominant. Enforcing to zero the power dissipated on interfaces it is possible to estimate the collapse multiplier corresponding to the twofold assumption that (i) parasite sliding is negligible and (ii) the material approximates in a technically acceptable way the no-tension one.
The model is first benchmarked on a masonry portal, where a reference solution is available, and then applied to two historical aggregates located in Italy. |
ArticleNumber | 116595 |
Author | Milani, Gabriele Wang, Peixuan |
Author_xml | – sequence: 1 givenname: Peixuan orcidid: 0000-0002-0882-3349 surname: Wang fullname: Wang, Peixuan organization: College of Architectural Science and Engineering, Yangzhou University, 225127, China – sequence: 2 givenname: Gabriele surname: Milani fullname: Milani, Gabriele email: gabriele.milani@polimi.it organization: Department of Architecture, Built Environment and Construction Engineering (ABC), Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milan, Italy |
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Cites_doi | 10.1007/s11069-016-2694-1 10.1016/j.engstruct.2019.04.040 10.1002/eqe.3405 10.1007/978-3-030-83221-6_2 10.1007/s10518-015-9747-9 10.1007/s10518-022-01528-3 10.1007/s10518-023-01639-5 10.3390/buildings12030323 10.1080/13632469.2022.2087793 10.1007/s10518-023-01666-2 10.1007/s10518-010-9207-5 10.3390/heritage5040217 10.1016/j.engstruct.2019.04.025 10.1080/15583058.2018.1503365 10.1007/s10518-020-00848-6 10.1016/j.advengsoft.2014.09.013 10.1007/s10518-023-01810-y 10.1061/(ASCE)CF.1943-5509.0000164 10.1016/j.jobe.2017.03.004 10.1007/s10518-022-01596-5 10.1007/s10518-023-01659-1 10.1080/15583058.2021.1992536 10.1016/j.compstruc.2021.106579 10.1007/s10518-015-9754-x 10.1080/15583058.2021.1992537 10.1080/13632469.2016.1172376 |
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Keywords | Material quasi-unable to withstand tensile stresses Iterative Linear Programming approach Upper Bound Finite Element Limit Analysis code Masonry aggregates Partial failure mechanisms activation |
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SubjectTerms | Iterative Linear Programming approach Masonry aggregates Material quasi-unable to withstand tensile stresses Partial failure mechanisms activation Upper Bound Finite Element Limit Analysis code |
Title | Seismic vulnerability prediction of masonry aggregates: Iterative Finite element Upper Bound limit analysis approximating no tensile resistance |
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