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Preface 7th International Conference on Mechanics of Masonry Structures Strengthened With Composite Materials, MuRiCo 7 2021
No full textThis volume is a collection of edited scientific papers presented at the International Conference on Mechanics of Masonry Structures Strengthened with Composites Materials (MuRiCo7) held online (November 24-26, 2021). The previous Conferences, organised by AICO (Italian Association of Composites in Constructions, established in 1996), were held at the University IUAV of Venice (years 2000, 2004, 2009) and University of Bologna, a campus of Ravenna (2014) and a campus of Bologna (2017, 2019). This International Conference, MuRiCo7, was organized by AICO under the patronage of DICAM Department of University of Bologna, DA Department of University of Bologna, and RILEM (International Union of Laboratories and Experts in Construction Materials, Systems and Structures). The Conference represented a forum to promote and exchange the latest theoretical, computational, and experimental research works finalised to the design of structural strengthening of historic masonry constructions.
The MuRiCo7 covers a wide range of general topics:
• Mechanics of historical masonry: testing and modeling
• Performance of strengthened masonry with composites (FRP, FRCM, TRM, SRG)
• Performance in masonry/composites coupling: bond, special connections, fracture, fatigue, fire, durability
• Appropriate composites techniques evolution for historical construction strengthening
• First aid and provisional devices in historical structures with collapse risk after seismic shock
• Criticism on existing guidelines, standards, and praxis in masonry/composites coupling
• Sustainability, circular economy, life-cycle assessment, and recycling.
The Editors would like to thank the members of the Scientific Committee and the organizers of the special mini symposiums for their support that contributed to the success of the Conference. Furthermore, we express our gratitude to AICO, promoting and organizing the Conference.
The Editors
G. Castellazzi, C. Gentilini and A. Di Tommaso
ALMA MATER STUDIORUM University of Bologna, November 202
Mechanical properties of fired-clay brick masonry models in moist and dry conditions
Full text linkRising damp is one of the main issues affecting masonry buildings. However, its consequences on the mechanical performance of masonry structures are not so largely explored. In this paper, the compressive and shear behaviour of masonry triplets, manufactured with solid fired-clay bricks and cement-based mortar, is investigated in dry and moist conditions. The results are interpreted on the basis of the features of the single materials, from both a mechanical and microstructural point of view
Thickness Effect on the Dynamic Behavior of Three-Dimensional Plates by using the Ritz Method
No full textA continuum three-dimensional Ritz formulation is presented for the free vibration analysis of homogeneous, isotropic, thick rectangular plates. The method is applied to investigate the effects of boundary constraints and thickness ratios on the vibration responses of these plates. The present formulation is based on the linear, three-dimensional, small-strain elasticity theory. The in-plane displacements and deflections are approximated by sets of self generating polynomial shape functions able to satisfy the essential geometric boundary conditions at the outset. Several numerical examples have been computed to demonstrate the accuracy and efficiency of the method. The influence of plate thickness and boundary constraints on the vibratory characteristics of thick plates is also discussed in detail
Towards an alternative approach to geometrical modelling of shell surfaces using a parametric representation
No full textA new approach to geometrical modelling of shell surfaces is presented. The geometrical mid-surface of the shell is represented through a parametric Hermite interpolation scheme, so providing a piecewise, smooth representation for an arbitrary shell geometry. This approach is well suited for applications in computer-aided geometric design (CAGD), since it produces visually pleasing plots in respect of the idea of the designer. Moreover, it can be easily implemented in finite element codes. To evaluate the performance of this approach, an elastic degenerate continuum shell element based on displacement interpolation has been implemented. Reduced and selective integration schemes in order to remove shear and membrane locking are used. The preliminary results are very promising, since they reveal a good convergence and accurate predictions
Degenerate states for a crack propagating in an orthotropic medium
No full textIn this paper is presented an approach that allows to find a complex variable representation of the elastodynamic fields in a degenerate state for an orthotropic medium. The near tip elastic fields are obtained for a shear crack steadily propagating. This method can be applied to show that for some values of elastic constants a degenerate state is physically admissible
An experimental study of the bond behavior of twisted steel bars embedded in mortar cylinders and in the joints of masonry wallettes
Full text linkAmong the different strengthening techniques available to reinforce masonry buildings, the near-surface mounted technique consists in inserting reinforcing elements of high-strength material in grooves realized by removing part of the mortar in the horizontal bed joints of a masonry wall. The present study deals with two experimental campaigns on pull-out tests conducted on twisted steel bars embedded concentrically in mortar cylinders and in the mortar bed joints of masonry wallettes as in in-situ applications. In order to compare the results between cylindrical and masonry specimens, the same bonded lengths are considered
Probabilistic characterization of linear truss structures with cracked members
No full textIn this paper a general method to study linear-elastic truss structures affected by uncertainties is presented. The formulation is simple and based on an approach recently proposed by Di Paola which is generalized to treat trusses with cracked members where the crack depth is uncertain. Following the same idea, the uncertainties are transformed into induced deformations on each bar element. The resultant method is shown to be an effective alternative to the standard simulation methods. A numerical test evidences an excellent performance, which promises a wide applicability of the new procedure also to more complex structures as, for example, frame structures
6th International Conference on Mechanics of Masonry Structures Strengthened with Composite Materials, MuRiCo6
No full textThis volume is a collection of edited scientific papers presented at the International Conference on Mechanics of Masonry Structures Strengthened with Composites Materials (MuRiCo6) held in Bologna (June 26-28, 2019)
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