The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Santiago Sánchez Beitia - One of the best experts on this subject based on the ideXlab platform.
-
stress analysis of the piers of the tarazona cathedral zaragoza spain by means of the hole Drilling Technique
Construction and Building Materials, 2008Co-Authors: Santiago Sánchez BeitiaAbstract:Abstract The paper deals with the application of the hole-Drilling Technique on the four piers of the crossing under the dome of the Cathedral of Tarazona (Zaragoza – Spain). The hole-Drilling Technique in architectural heritage is named the Donostia Method by the author in previous works. The monument (XIIIth Century) is an excellent cathedral not well known because 25 years ago it was closed by its alarming structural situation. In the XVIth century the gothic original cupola was replaced by a new more weighted dome (cimborrio) modifying the typical load transmission of such constructions. The new dome and the four piers that transmit their weight have been fixed by means of a metallic structure from the moment the cathedral was closed. Over the past years several works of structural reinforcement have been made on the piers and their foundations. It is expected for the next few months that the metallic structure can be disassembled allowing access inside the cathedral. The stress states of each pier have been obtained by means of the hole-Drilling Technique. The two piers at the absydial zone present high compression stresses, whereas the other two piers present a much smaller level of compressions. The tests carried out make it possible to deduce several values of the principal stresses in each pier; this fact makes it possible to analyze the quality of the results.
-
Stress analysis of the piers of the Tarazona Cathedral (Zaragoza – Spain) by means of the hole-Drilling Technique
Construction and Building Materials, 2008Co-Authors: Santiago Sánchez BeitiaAbstract:Abstract The paper deals with the application of the hole-Drilling Technique on the four piers of the crossing under the dome of the Cathedral of Tarazona (Zaragoza – Spain). The hole-Drilling Technique in architectural heritage is named the Donostia Method by the author in previous works. The monument (XIIIth Century) is an excellent cathedral not well known because 25 years ago it was closed by its alarming structural situation. In the XVIth century the gothic original cupola was replaced by a new more weighted dome (cimborrio) modifying the typical load transmission of such constructions. The new dome and the four piers that transmit their weight have been fixed by means of a metallic structure from the moment the cathedral was closed. Over the past years several works of structural reinforcement have been made on the piers and their foundations. It is expected for the next few months that the metallic structure can be disassembled allowing access inside the cathedral. The stress states of each pier have been obtained by means of the hole-Drilling Technique. The two piers at the absydial zone present high compression stresses, whereas the other two piers present a much smaller level of compressions. The tests carried out make it possible to deduce several values of the principal stresses in each pier; this fact makes it possible to analyze the quality of the results.
Santiago Sanchezbeitia - One of the best experts on this subject based on the ideXlab platform.
-
hole Drilling Technique for on site stress measurements of masonry piers analysis of the santa maria del mar cathedral in barcelona spain
Journal of Architectural Engineering, 2014Co-Authors: Santiago Sanchezbeitia, Pere RocaAbstract:AbstractThe construction of the Santa Maria del Mar cathedral dates back to 1329. The cathedral represents an excellent example of the Gothic style in Catalonia. Because of the observed damage on the piers of the main nave, special attention was focused on determining the piers’ stress states. During a research campaign, the resulting stresses are determined numerically as well as experimentally based on a minimally destructive Technique called the hole Drilling Technique. The Technique allows determination of the principal stresses and their direction in stone masonry. The experimental results are compared with the outcome of a comparative numerical analysis. The quality of the experimental Technique and the usefulness of the on-site methodology in the framework of cultural heritage sites are presented and discussed. The aim of the paper is the final corroboration of the applicability of the hole Drilling Technique in masonry structures. The Technique has been previously checked in the Altes Museum (Berl...
-
the hole Drilling Technique for on site deduction of the stresses states in stone masonry by using eight strain gages
Construction and Building Materials, 2009Co-Authors: Santiago Sanchezbeitia, Luc SchueremansAbstract:Abstract The hole Drilling Technique for the on site deduction of the stresses in structural elements of cultural heritage structures has been applied on two monuments: the Saint Jakobs Church (Leuven, Belgium) and the Cathedral of Tarazona (Zaragoza, Spain). The adjustment of the Technique becomes an experimental methodology very different from the one employed for the deduction of residual stresses. There are two main differences in the experimental methodology: the experimental dimensions are thirty times greater and eight strain gages are placed instead of three. The latter is done to have sufficient redundancy in the system and to be able to make an objective analysis of the quality of the results. The paper basically deals with the derivation of the stress states from the strains caught by the eight strain gages in agreement with the general methodology of the hole Drilling Technique.
-
stresses analysis at the altes museum of berlin by means of the hole Drilling Technique donostia method
Construction and Building Materials, 2007Co-Authors: Santiago SanchezbeitiaAbstract:Abstract The article deals with the application of Hole-Drilling Technique on structural elements of the basement floor of the Altes Museum of Berlin (1824–1830 by the Architect Shinkel). In the previous publications, the Hole-Drilling Technique was labelled as Donostia Method by the author. The objective of the research is the deduction of the state of the stresses on structural elements of the Architectural Heritage. The method involves glued strain gages at the surface of a stone block. The Drilling device is a diamond crown extracting a round material at the centre of a stone block of a masonry. At least three strain gages are placed in the area under consideration. The strain gages record the strains originated by stress relaxation after extracting a round of 36 mm diameter and 36 mm depth. The stresses before drill can be deduced with an appropriate mathematical scheme. The Donostia Method is a minor destructive test providing sufficient information to calculate the principal stresses and their directions around the drill. Two limestone walls, which support the loads of the upper floors introduced in the restoration made after the Second World War, have been analyzed. The tests carried out make it possible to deduce several values of the principal stresses in each analyzed zone.
Jaime Yurrebaso-asúa - One of the best experts on this subject based on the ideXlab platform.
-
Biomechanical evaluation of oversized Drilling Technique on primary implant stability measured by insertion torque and resonance frequency analysis.
Journal of Clinical and Experimental Dentistry, 2016Co-Authors: Gorka Santamaría-arrieta, Aritza Brizuela-velasco, Felipe J. Fernández-gonzález, David Chávarri-prado, Yelko Chento-valiente, Eneko Solaberrieta, Markel Diéguez-pereira, J.a. Vega, Jaime Yurrebaso-asúaAbstract:Background: This study evaluated the influence of implant site preparation depth on primary stability measured by insertion torque and resonance frequency analysis (RFA). Material and Methods: Thirty-two implant sites were prepared in eight veal rib blocks. Sixteen sites were prepared using the conventional Drilling sequence recommended by the manufacturer to a working depth of 10mm. The remaining 16 sites were prepared using an oversize Drilling Technique (overpreparation) to a working depth of 12mm. Bone density was determined using cone beam computerized tomography (CBCT). The implants were placed and primary stability was measured by two methods: insertion torque (Ncm), and RFA (implant stability quotient [ISQ]). Results: The highest torque values were achieved by the conventional Drilling Technique (10mm). The ANOVA test confirmed that there was a significant correlation between torque and Drilling depth (p0.05) at either measurement direction (cortical and medullar). No statistical relation between torque and ISQ values was identified, or between bone density and primary stability (p>0.05). Conclusions: Vertical overpreparation of the implant bed will obtain lower insertion torque values, but does not produce statistically significant differences in ISQ values.
-
Biomechanical evaluation of oversized Drilling Technique on primary implant stability measured by insertion torque and resonance frequency analysis.
Journal of clinical and experimental dentistry, 2016Co-Authors: Gorka Santamaría-arrieta, Aritza Brizuela-velasco, Felipe J. Fernández-gonzález, David Chávarri-prado, Yelko Chento-valiente, Eneko Solaberrieta, Markel Diéguez-pereira, J.a. Vega, Jaime Yurrebaso-asúaAbstract:This study evaluated the influence of implant site preparation depth on primary stability measured by insertion torque and resonance frequency analysis (RFA). Thirty-two implant sites were prepared in eight veal rib blocks. Sixteen sites were prepared using the conventional Drilling sequence recommended by the manufacturer to a working depth of 10mm. The remaining 16 sites were prepared using an oversize Drilling Technique (overpreparation) to a working depth of 12mm. Bone density was determined using cone beam computerized tomography (CBCT). The implants were placed and primary stability was measured by two methods: insertion torque (Ncm), and RFA (implant stability quotient [ISQ]). The highest torque values were achieved by the conventional Drilling Technique (10mm). The ANOVA test confirmed that there was a significant correlation between torque and Drilling depth (p<0.05). However, no statistically significant differences were obtained between ISQ values at 10 or 12 mm Drilling depths (p>0.05) at either measurement direction (cortical and medullar). No statistical relation between torque and ISQ values was identified, or between bone density and primary stability (p >0.05). Vertical overpreparation of the implant bed will obtain lower insertion torque values, but does not produce statistically significant differences in ISQ values. Implant stability quotient, overDrilling, primary stability, resonance frequency analysis, torque.
Matias R. Viotti - One of the best experts on this subject based on the ideXlab platform.
-
Residual stress measurements in steel pipes using DSPI and the hole-Drilling Technique
International Journal of Pressure Vessels and Piping, 2017Co-Authors: Livia R. Lothhammer, Matias R. Viotti, Armando Albertazzi, Celso L. N. VeigaAbstract:Abstract The oil and gas industry employs long distance pipelines to simplify the transport logistic and to reduce the final costs of petroleum derivatives. For the construction of pipelines, nowadays it is usual the application of pipes which are manufactured by cold forming operations. The high level of the non-uniform plastic deformation of the steel during the pipe manufacturing process produces residual stresses. These stresses are internally self-equilibrated, but locally can affect the structural integrity of the pipeline. Therefore, an accurate measurement of residual stresses is important to guarantee a safe and healthy pipeline network. This paper shows the application of a portable optical device combining digital speckle pattern interferometry and the hole Drilling Technique to measure residual stress fields in pipe samples manufactured by the UOE-SAW and ERW processes. A set of 72 measurements were performed in order to scan the residual stress distribution along the external surface of each pipe. On the other hand, a smaller set of measurements were performed in the internal surface of an ERW pipe sample. Considering all cases, the mapping has revealed the presence of stress profiles which were compressive in the first half of the hole and tensile in the second one. Additionally, the external measurements demonstrated a good repeatability between them, indicating a similar stress behavior along the circumferential and longitudinal directions of the pipe.
-
compact sensor combining digital speckle pattern interferometry and the hole Drilling Technique to measure nonuniform residual stress fields
Optical Engineering, 2013Co-Authors: Matias R. Viotti, Armando AlbertazziAbstract:A portable device to essentially measure residual stress fields outside an optical bench is presented. This system combines the hole-Drilling Technique with digital speckle pattern interferometry. A novel feature of this device is its high degree of compaction since only one base supports simultaneously the measurement module and the hole-Drilling device. A new version of the American society for testing and materials standard E837 for the measurement of residual stresses has been improved including a computation method for nonuniform residual stresses. According to this standard, a hole with a maximum depth of 1.0 mm should be introduced into the material to assess the stress distribution along the hole’s depth. The discretization of the stress distribution is performed in 20 equal steps of 0.05 mm, getting the deformations generated for stress relief in every Drilling step. A description of the compact device showing the solution for a fast and easy interchanging process between modules is also presented. The proposed system was compared with a traditional method using strain gages, and a good agreement was shown between stress distributions measured with both methods. Finally, the portable device was used to evaluate the residual stress distribution in a sample with a rod welded by friction hydro pillar processing.
-
compact sensor combining dspi and the hole Drilling Technique to measure non uniform residual stress fields
SPECKLE 2012: V International Conference on Speckle Metrology : 10-12 september 2012 : Vigo Spain 2012 ISBN 9780819490902, 2012Co-Authors: Matias R. Viotti, Armando AlbertazziAbstract:This paper presents a portable device to essentially measure residual stress fields outside the optical bench. This system combines the hole Drilling Technique with Digital Speckle Pattern Interferometry (DSPI). The novel feature of this device is its high degree of compaction since only one base supports simultaneously the measurement module and the holeDrilling device. A new version of the ASTM E837 standard for the measurement of residual stresses has been improved including the computation method for non-uniform residual stresses. According to this standard, a hole with depth of 1.0 mm should be introduced into the material to assess the stress distribution. The discretization of the stress distribution along the hole depth is performed in 20 equal steps of 0.05 mm, getting the deformations generated for stress relief in every Drilling step. A description of the compact device showing the solution for a fast and easy interchanging process between modules is performed in this paper. The proposed system is used to evaluate the residual stress distribution into a sample with a rod welded by friction hydro pillar processing (FHPP)
-
A portable digital speckle pattern interferometry device to measure residual stresses using the hole Drilling Technique
Optics and Lasers in Engineering, 2006Co-Authors: Matias R. Viotti, Andrés E. Dolinko, Gustavo E. Galizzi, Guillermo H. KaufmannAbstract:This paper presents a portable device to measure residual stresses using the hole Drilling Technique combined with digital speckle pattern interferometry. This device, which is based on only one dual-beam illumination system, allows the determination of the three components of the residual stress from the measured displacement field generated by the hole when specimens are placed outside of the optical bench. The description of the portable device and its principal characteristics is followed by the presentation of some preliminary experimental results obtained in thin aluminium plates subjected to a uniform uniaxial stress. An error analysis of the uncertainty sources introduced during the evaluation of the residual stresses, namely the error generated by the automatic data processing, the error produced by an incorrect location of the hole centre and the introduction of rigid body displacements, is also presented.
Guillermo H. Kaufmann - One of the best experts on this subject based on the ideXlab platform.
-
A portable digital speckle pattern interferometry device to measure residual stresses using the hole Drilling Technique
Optics and Lasers in Engineering, 2006Co-Authors: Matias R. Viotti, Andrés E. Dolinko, Gustavo E. Galizzi, Guillermo H. KaufmannAbstract:This paper presents a portable device to measure residual stresses using the hole Drilling Technique combined with digital speckle pattern interferometry. This device, which is based on only one dual-beam illumination system, allows the determination of the three components of the residual stress from the measured displacement field generated by the hole when specimens are placed outside of the optical bench. The description of the portable device and its principal characteristics is followed by the presentation of some preliminary experimental results obtained in thin aluminium plates subjected to a uniform uniaxial stress. An error analysis of the uncertainty sources introduced during the evaluation of the residual stresses, namely the error generated by the automatic data processing, the error produced by an incorrect location of the hole centre and the introduction of rigid body displacements, is also presented.
