Implementation and validation of a strain rate dependent anisotropic continuum model for masonry

Rafsanjani, Seyedebrahim Hashemi; Lourenço, Paulo B.; Peixinho, Nuno

doi:10.1016/j.ijmecsci.2015.10.001

Cited by 18 publications

(5 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The explicit solver suffers from a time-step solution bias since considerable small-time increments are required to avoid a system misrepresentation. Although its use is recommended for many problems due to its stability-as fast-dynamic problems or when interface contact exists [111][112][113][114]-, an explicit solver may lead to long and prohibitive processing times and to larger disk storage space when conducting a seismic assessment study of a masonry structure. In converse, an implicit procedure allows larger time increments with the setback that a converged solution must be found for each iteration; however, this is well handled by the macro-element due to its robustness, as is demonstrated next in Section 4.3.…”

Section: Implicit Vs Explicit Fe Analysismentioning

confidence: 99%

A FE-Based Macro-Element for the Assessment of Masonry Structures: Linear Static, Vibration, and Non-Linear Cyclic Analyses

Silva

2022

Applied Sciences

View full text Add to dashboard Cite

A Finite Element (FE) based macro–element is described for the mechanical response of masonry structures within different ranges of analysis. The macro–element is composed of discrete rigid quadrilateral FE plates whose adjoining interfaces are connected through FE trusses. It allows representing both elasticity and strength orthotropy, full material nonlinearity and damage through a scalar–based model. The possibility of coupling with a so–called FE2 (multi–scale) strategy is also addressed. Validation of the macro–element is conducted within linear static, vibration, and cyclic (nonlinear) problems, in which both static and dynamic ranges are explored. Results are compared with those retrieved from traditional FE continuous models. Advantages are highlighted, as well as its robustness to cope with convergence issues and suitability to be applied within more general and larger–scale scenarios, such as the analysis of anisotropic materials subjected to static and dynamic loading. Formal details are given for its reproducibility by academics and practitioners—eventually within other FE platforms—as the improved running times may be of utmost importance in dynamic problems or highly nonlinear (material) quasi–static analysis.

show abstract

Section: Implicit Vs Explicit Fe Analysismentioning

confidence: 99%

A FE-Based Macro-Element for the Assessment of Masonry Structures: Linear Static, Vibration, and Non-Linear Cyclic Analyses

Silva

2022

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…The deformation of the studied parapets has been recorded in a node located 580 mm above the base and deviated 250 mm from the center. The static material properties and the rate-dependency issue is addressed for all the formulations; for the macroscopic model in (Rafsanjani et al 2015a), for the mesoscopic model in (Rafsanjani et al 2015b), and for the two-scale model in (Silva et al 2017a). To guarantee the consistency and representativeness of the comparison, the models used the same analytical expressions for the DIFs.…”

Section: Sheffield University Parapet Wallmentioning

confidence: 99%

Computational Applications in Masonry Structures: From the Meso-Scale to the Super-Large/Super-Complex

Lourenço

Silva

2020

Int J Mult Comp Eng

View full text Add to dashboard Cite

Masonry structures constitute a large portion of the built heritage around the world, from the past and still today. Therefore, understanding their structural behavior is crucial for preserving the historical characteristics of many of those buildings and in addressing the requirements for housing and sustainable development. Due to its composite and highly non-linear nature, the analysis of masonry structures has been a challenge for engineers. This paper presents a set of advanced models for the mechanical study of masonry, including the usual micro-modeling approaches (in which masonry constituents, i.e. unit and joint, are represented separately), macro-modeling (in which masonry constituents are smeared in a homogeneous composite) and multi-scale techniques (in which upscaling from micro to macro is adopted). An extensive overview of its computational features is provided.Finally, the engineering application of such strategies is presented and covers problems from the masonry components level (meso-scale) to the structural element itself, and ultimately to the level of monumental buildings (super-large). The structural safety assessment and/or strengthening schemes evaluation are performed amid the static, slow dynamics or earthquakes, and fast dynamics or impact and blast ranges.

show abstract

“…Only qualitative data, such as localised damages, cracks, and penetration of the impactor, were recorded. Whilst the quantitative data recording for deformation and crack widths measurement can be facilitated by additional measuring accessories (Acharya et al, 2017; Burnett et al, 2007; Hao and Tarasov, 2008; Kader et al, 2021; Rafsanjani, 2015; Rafsanjani et al, 2015), flexibility of changing impactor mass, velocity and scaling of samples for realistic horizontal impacts are the major challenges for the available testing facilities. In addition, studies on global response of infrastructure to credible impacts to minimise damages and potential causalities through appropriate retrofitting is important.…”

Section: Introductionmentioning

confidence: 99%

Innovative impact testing machine for enhancing impact related research in Australia

Asad

Zahra

Thambiratnam

et al. 2022

International Journal of Protective Structures

View full text Add to dashboard Cite

This paper summarises the development of a state-of-art impact testing machine for simulating impacts such as vehicular crashes or debris impacts onto structures. The machine has a 200 kg pneumatically powered projectile which can travel horizontally within the barrel of the machine with a maximum velocity of 50 m/s to impact the target structure. The maximum kinetic energy that can be generated by the projectile is 125 kJ by using different combinations of mass and velocity. The diameter of the projectile is 214 mm, and its impacting face can be changed to different shapes, such as flat circle, flat square or an elliptical nose to suit different impact scenarios. An innovative braking mechanism incorporating a crush tube is attached within the barrel to ensure safety when the projectile fails to be restrained by the impact. The crush tube can absorb the maximum imparted by the moving projectile. An advanced data acquisition system is installed to collect quantitative and qualitative test data during a period of 50 ms to 1 s. Two high-speed digital image correlation (DIC) cameras are attached and synchronised with the operation of the impact testing machine to record the images at the rate of 50,000 frames per second. Outputs in terms of strains, deformations, accelerations of the target structure with a record of damage history can be analysed using this 3D DIC technique. The paper also briefly presents the first application of this machine for impact testing masonry wall structures.

show abstract

Implementation and validation of a strain rate dependent anisotropic continuum model for masonry

Cited by 18 publications

References 13 publications

A FE-Based Macro-Element for the Assessment of Masonry Structures: Linear Static, Vibration, and Non-Linear Cyclic Analyses

A FE-Based Macro-Element for the Assessment of Masonry Structures: Linear Static, Vibration, and Non-Linear Cyclic Analyses

Computational Applications in Masonry Structures: From the Meso-Scale to the Super-Large/Super-Complex

Innovative impact testing machine for enhancing impact related research in Australia

Contact Info

Product

Resources

About