Experimental Characterization of Masonry and Masonry Components at High Strain Rates

Pereira, João Miguel; Lourenço, Paulo B.

doi:10.1061/(asce)mt.1943-5533.0001755

Cited by 17 publications

(14 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At present time, the dynamic mechanical behavior of lime mortars is getting more attention due to the fact that most masonry structures are situated in zones of seismic activity, such as Lisbon (Portugal), L'Aquila (Italy), Lorca (Spain), Kathmandu (Nepal), Nairobi (Kenya), etc. Pereira and Lourenço [14] studied the dynamic compressive behavior of masonry specimens, clay brick, and mortar prisms by using a drop-weight tower. The corresponding strain rate range was from 2 to 200 s −1 .…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior of Natural Hydraulic Lime Mortars

Garijo¹,

Zhang²,

Ruiz³

et al. 2019

Sustainable Construction and Building Materials

View full text Add to dashboard Cite

Natural hydraulic lime (NHL) mortars are widely used for restoration works due to their good compatibility with the substrate material in terms of physical, chemical, and mechanical properties. Regarding their mechanical characterization, there is still a need for further understanding of their fracture behavior and the influence of their dosage methodology on the mechanical properties. Thus, this chapter focuses on the mechanical characterization of NHL mortars, such as flexural, compressive, and splitting tensile strengths, elastic modulus, and fracture energy. Moreover, the influence of the composition and production process on such properties was studied as well. Furthermore, the loading rate effect on the fracture behavior was also presented. The results show that NHL mortars have shape and size effect on the compressive strength. In addition, NHL mortar is rate sensitive, mainly due to the viscous effects caused by the presence of free water in the porous structure.

show abstract

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior of Natural Hydraulic Lime Mortars

Garijo¹,

Zhang²,

Ruiz³

et al. 2019

Sustainable Construction and Building Materials

View full text Add to dashboard Cite

show abstract

“…Scaling laws allow for parametric correlations between a defined explosion and a standard charge of the same substance to predict the effects of large-scale explosions using a smaller scale [24]. The Hopkinson-Cranz scaling laws are the most widely accepted (2), where R is the standoff distance from the center of the detonation, in m, and W is the charge mass in kg of equivalent TNT.…”

Section: Blast Loading Definition and Fem Modelingmentioning

confidence: 99%

“…The equations proposed by Wu and Hao for the arrival time [10] and the equation by Sadovskyi for the positive phase duration [11] were closest to these charts [8]. Newmark and Hansen's equation for the peak side-on overpressure [12] was used in a previous case study [2]. The reflected overpressure was calculated based on previously determined formulations [13].…”

Section: Blast Loading Definition and Fem Modelingmentioning

confidence: 99%

“…The accuracy of the FEM model is ensured by comparing the eigenvalue analysis results to a previous model created and calibrated to the building using dynamic identification [1]. Under dynamic loading conditions, materials can have different behavior when compared with quasi-static conditions [2][3][4][5]. Despite this, static material properties have previously been used in research work on the structural response and damage under impact and blast loading, which can lead to an inaccurate prediction of the damage [6,7].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Analysis of an Earthen Masonry Structure Subjected to Blast Loading

Tse¹,

Pereira²,

Lourénço³

2021

CivilEng

Self Cite

View full text Add to dashboard Cite

Historic monuments and construction capture the knowledge of civilizations of the past and are a source of pride for people of the present. Over the centuries, these buildings have been at risk from natural and man-made causes. The Alhambra, a UNESCO World Heritage Site in Granada, Spain, is one of such places. This paper aims to evaluate the structural performance of the Torre de la Vela, a tower in the Alhambra, under blast loads. The loads were based on historical records of barrels of gunpowder and were modeled as simplified pressure profiles using existing empirical equations. The effect of impulsive loading on the material properties was accounted for using dynamic increase factors, determined experimentally by previous authors. The model was created using finite element methods (FEM) and the problem was solved using explicit dynamic analysis available in Abaqus/Explicit. Using the failure volume damage index, a blast load applied outside and inside of the building would create a low damage level, which should be treated with caution given the occurrence of localized damage. The removal of elements exceeding a given damage threshold led to more visible damage patterns than the Concrete Tension Damage option in Abaqus.

show abstract

“…In this concern, Pereira and Lourenço [4] tested a commercial pre-mixed mortar under different strain rates ranging from 2 s -1 to 200 s -1 by using a drop-weight tower. For the highest strain rate, they obtained a dynamic increase factor (DIF), a ratio of the dynamic response over the quasi-static one, for the fracture energy in compression of 2.73.…”

Section: Introductionmentioning

confidence: 99%

Influence of loading rate on the fracture behaviour of natural hydraulic and aerial lime mortars

Zhang¹

2019

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures

View full text Add to dashboard Cite

Natural hydraulic and aerial lime mortars are used extensively for restoration works due to their good compatibility with the substrate material in historical masonry construction. Recently, the study of the influence of loading rate of such materials is getting more attention due to the fact that many historic masonry structures are situated in zones of seismic activity. However, the references are still scarce in comparison to that of steel and concrete and the studies focused on the measurement of the influence of loading rate on the fracture energy are limited, although it is an important parameter to characterize the ductility and the fracture behaviour of the material. Thus, in the paper, an aerial and a natural hydraulic lime mortar specimens were tested at various loading rates (loading-point displacement rates) from the quasi-static one, 5.0 × 10 -4 mm/s, to rate sensitive ones, 5.0 × 10 -1 mm/s and 1.6 × 10 1 mm/s. For this purpose, it was used a servo-hydraulic testing machine up to its maximum range of velocities. The results show that the fracture energy and the peak load of both lime mortars are rate sensitive. The maximum dynamic increase factors of the fracture energy are 1.9 for both mortars, while 1.4 and 1.6 for the natural hydraulic and the aerial lime mortars, respectively, in the peak load. This behaviour is related to viscous effects of free water in the mortar.

show abstract

Experimental Characterization of Masonry and Masonry Components at High Strain Rates

Cited by 17 publications

References 14 publications

Mechanical Behavior of Natural Hydraulic Lime Mortars

Mechanical Behavior of Natural Hydraulic Lime Mortars

Numerical Analysis of an Earthen Masonry Structure Subjected to Blast Loading

Influence of loading rate on the fracture behaviour of natural hydraulic and aerial lime mortars

Contact Info

Product

Resources

About