Real-Space In Situ Bond Energies: Toward A Consistent Energetic Definition of Bond Strength

The evaluation of the shear behavior of masonry walls is a first fundamental step for the assessment of existing masonry structures in seismic zones. However, due to the complexity of modelling experimental behavior and the wide variety of masonry types characterizing historical structures, the definition of masonry’s mechanical behavior is still a critical issue. Since the possibility to perform in situ tests is very limited and often conflicting with the needs of preservation, the characterization of shear masonry behavior is generally based on reference values of mechanical properties provided in modern structural codes for recurrent masonry categories. In the paper, a combined test procedure for the experimental characterization of masonry mechanical parameters and the assessment of the shear behavior of masonry walls is presented together with the experimental results obtained on three stone masonry walls. The procedure consists of a combination of three different in situ tests to be performed on the investigated wall. First, a single flat jack test is executed to derive the normal compressive stress acting on the wall. Then a double flat jack test is carried out to estimate the elastic modulus. Finally, the proposed shear test is performed to derive the capacity curve and to estimate the shear modulus and the shear strength. The first results obtained in the experimental campaign carried out by the authors confirm the capability of the proposed methodology to assess the masonry mechanical parameters, reducing the uncertainty affecting the definition of capacity curves of walls and consequently the evaluation of seismic vulnerability of the investigated buildings.

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Influence of different contaminants and cleansing agents on bond strength and in situ degree of conversion of composite-adhesive interface

International Journal of Adhesion and Adhesives ◽

10.1016/j.ijadhadh.2021.102932 ◽

2021 ◽

pp. 102932

Author(s):

Emanuela Gaviolli ◽

Elenusa Oltramari Vieira ◽

Felipe Dornelles da Silva ◽

Luiz Felipe Valandro ◽

Sailer Santos dos Santos ◽

...

Keyword(s):

Bond Strength ◽

Degree Of Conversion ◽

Adhesive Interface

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Imaging the Polymorphic Transformation in a Single Cu6Sn5 Grain in a Solder Joint

Materials ◽

10.3390/ma11112229 ◽

2018 ◽

Vol 11 (11) ◽

pp. 2229 ◽

Cited By ~ 3

Author(s):

Flora Somidin ◽

Hiroshi Maeno ◽

Xuan Tran ◽

Stuart D. McDonald ◽

Mohd Mohd Salleh ◽

...

Keyword(s):

Solder Joint ◽

Polymorphic Transformation ◽

Structural Evolution ◽

Real Space ◽

Transformation Behavior ◽

New Approach ◽

Transmission Electron ◽

Contrast Pattern ◽

In Situ Observations

In-situ observations of the polymorphic transformation in a single targeted Cu6Sn5 grain constrained between Sn-0.7 wt % Cu solder and Cu-Cu3Sn phases and the associated structural evolution during a solid-state thermal cycle were achieved via a high-voltage transmission electron microscope (HV-TEM) technique. Here, we show that the monoclinic η′-Cu6Sn5 superlattice reflections appear in the hexagonal η-Cu6Sn5 diffraction pattern upon cooling to isothermal 140 °C from 210 °C. The in-situ real space imaging shows that the η′-Cu6Sn5 contrast pattern is initiated at the grain boundary. This method demonstrates a new approach for further understanding the polymorphic transformation behavior on a real solder joint.

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Contribution of in situ geophysical methods for the definition of the São Sebastião crater model (Azores)

Journal of Applied Geophysics ◽

10.1016/j.jappgeo.2013.09.006 ◽

2013 ◽

Vol 98 ◽

pp. 265-279 ◽

Cited By ~ 2

Author(s):

Isabel Lopes ◽

Gian Piero Deidda ◽

Manuela Mendes ◽

Claudio Strobbia ◽

Jaime Santos

Keyword(s):

Geophysical Methods ◽

Definition Of

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Prévision par modélisation numérique de la zone de risque bordant un tronçon de rivière subissant une crue exceptionnelle

Canadian Journal of Civil Engineering ◽

10.1139/l03-018 ◽

2003 ◽

Vol 30 (3) ◽

pp. 568-579 ◽

Cited By ~ 10

Author(s):

T Mahdi ◽

C Marche

Keyword(s):

Slope Stability ◽

Transport Model ◽

Modélisation Numérique ◽

River Bed ◽

Geotechnical Characteristics ◽

Definition Of ◽

Saguenay River ◽

Downstream Area ◽

Soil Movements

The direct impacts of floods are often considered as limited to the maximum downstream area exposed to the flooding. Considering the size of exceptional floods, the river bed could undergo deep changes. Pairing the GSTARS sediment transport model to a slope stability model (modified Bishop method) that we developed, this paper presents a methodology leading to the definition of a true safety zone along the shores as it takes into account the risk of floods and soil movements: each section of this river undergoes changes due to sediment-fluvial hydraulics ( erosion-deposit) and then eventual landslides modify the profiles. To analyze this, we had first to determine the hydraulic and geotechnical characteristics then use them to test the slope stability of the various legs of the watercourse before and during flooding. The application of this method to a tributary of the Saguenay River for the 1996 "downpour" shows a very good correlation of results with those collected in situ. The method can be directly applied to define the anticipated evacuation zone in case of dam failure.Key words: flooding, evacuation zone, numerical simulations, slope stability, transportation of solids.[Journal Translation]

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Influence of in Situ Postbleaching Times on Shear Bond Strength of Resin-Based Composite Restorations

The Journal of the American Dental Association ◽

10.14219/jada.archive.2010.0164 ◽

2010 ◽

Vol 141 (3) ◽

pp. 300-306 ◽

Cited By ~ 16

Author(s):

Marcos Eugenio Bittencourt ◽

Micheline Sandini Trentin ◽

Maria Salete Sandini Linden ◽

Ynara Bosco de Oliveira Lima Arsati ◽

Fabiana Mantovani Gomes França ◽

...

Keyword(s):

Bond Strength ◽

Shear Bond Strength ◽

Composite Restorations

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Instantaneous Identification of Polynomial Nonlinearity Based on Volterra Series Representation

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.293-294.703 ◽

2005 ◽

Vol 293-294 ◽

pp. 703-710 ◽

Cited By ~ 8

Author(s):

Giacomo V. Demarie ◽

Rosario Ceravolo ◽

Alessandro de Stefano

Keyword(s):

Structural Engineering ◽

Volterra Series ◽

Series Representation ◽

Consistent Estimate ◽

Short Time Fourier Transform ◽

Dynamic Identification ◽

Polynomial Nonlinearity ◽

Definition Of ◽

Short Time

In structural engineering applications a sufficient quantity of experimental data to be able to achieve a consistent estimate of nonlinear quantities is seldom available: this applies in particular when the structures are to be tested in situ. This report discusses the definition of instantaneous estimators to be used in the dynamic identification of invariant nonlinear systems on the basis of Short-Time Fourier Transform representation of excitation and system’s response and within the framework of a Volterra series representation of the input/output relationship. An estimation of the parameters of a dynamic system can be worked out from the evolution of such instantaneous estimators.

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Nearshore Sandbar Classification of Sabaudia (Italy) with LiDAR Data: The FHyL Approach

Remote Sensing ◽

10.3390/rs12071053 ◽

2020 ◽

Vol 12 (7) ◽

pp. 1053 ◽

Cited By ~ 2

Author(s):

Andrea Taramelli ◽

Sergio Cappucci ◽

Emiliana Valentini ◽

Lorenzo Rossi ◽

Iolanda Lisi

Keyword(s):

Central Italy ◽

Management Technique ◽

Surface Model ◽

Spectroscopic Techniques ◽

Sand Bars ◽

Bed Form ◽

Position Index ◽

Definition Of ◽

Spectral Libraries

An application of the FHyL (field spectral libraries, airborne hyperspectral images and topographic LiDAR) method is presented. It is aimed to map and classify bedforms in submerged beach systems and has been applied to Sabaudia coast (Tirrenyan Sea, Central Italy). The FHyl method allows the integration of geomorphological observations into detailed maps by the multisensory data fusion process from hyperspectral, LiDAR, and in-situ radiometric data. The analysis of the sandy beach classification provides an identification of the variable bedforms by using LiDAR bathymetric Digital Surface Model (DSM) and Bathymetric Position Index (BPI) along the coastal stretch. The nearshore sand bars classification and analysis of the bed form parameters (e.g., depth, slope and convexity/concavity properties) provide excellent results in very shallow waters zones. Thanks to well-established LiDAR and spectroscopic techniques developed under the FHyL approach, remote sensing has the potential to deliver significant quantitative products in coastal areas. The developed method has become the standard for the systematic definition of the operational coastal airborne dataset that must be provided by coastal operational services as input to national downstream services. The methodology is also driving the harmonization procedure of coastal morphological dataset definition at the national scale and results have been used by the authorities to adopt a novel beach management technique.

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Clearing a Path for Ground Heat Exchange Systems: A Review on Thermal Response Test (TRT) Methods and a Geotechnical Routine Test for Estimating Soil Thermal Properties

Energies ◽

10.3390/en13112965 ◽

2020 ◽

Vol 13 (11) ◽

pp. 2965 ◽

Cited By ~ 2

Author(s):

Alessandro Franco ◽

Paolo Conti

Keyword(s):

Experimental Analysis ◽

Thermal Response ◽

Ground Level ◽

Thermal Response Test ◽

Response Test ◽

Foundation Base ◽

Definition Of ◽

Geotechnical Tests

The performance of ground heat exchanger systems depends on the knowledge of the thermal parameters of the ground, such as thermal conductivity, capacity, and diffusivity. The knowledge of these parameters often requires quite accurate experimental analysis, known as a thermal response test (TRT). In this paper, after a general analysis of the various available types of TRT and a study of the theoretical basics of the method, we explore the perspective of the definition of a simplified routine method of analysis based on the combination of a particular version of TRT and the routine geotechnical tests for the characterization of soil stratigraphy and the ground characteristics. Geotechnical analyses are indeed mandatory before the construction of new buildings, even if limited to 30 m below the ground level or foundation base when piles are needed. The idea of developing TRT in connection with geotechnical test activity has the objective of promoting the widespread use of in situ experimental analysis and reducing TRT costs and time. The considerations presented in the present paper lead to reconsidering a particular variety of the TRT, in particular, the versions known as thermal response test while drilling (TRTWD) and TRT using heating cables (HC-TRT).

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The Rosetta Mission to Primitive Bodies of the Solar System

Symposium - International Astronomical Union ◽

10.1017/s0074180900046660 ◽

1994 ◽

Vol 160 ◽

pp. 381-394

Author(s):

Yves Langevin

Keyword(s):

Remote Sensing ◽

Solar System ◽

European Space Agency ◽

Time Span ◽

Main Belt ◽

Space Agency ◽

Rosetta Mission ◽

One Year ◽

Definition Of

The European Space Agency (ESA) has selected Rosetta as the next cornerstone mission, to be launched in 2003. The goal is to perfom one or more fly-bys to main belt asteroids, followed by a rendez-vous with an active comet. Advanced in situ analysis, both in the coma and on the surfaces of the nucleus, will be possible, as well as monitoring by remote sensing instruments of the nucleus and of the inner coma for a time span of more than one year, until perihelion. This paper outlines the scientific and technological choices done in the definition of the mission.

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