3.2 Pasantías y ponencias

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https://hdl.handle.net/20.500.12390/361

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Examinando 3.2 Pasantías y ponencias por Autor "rp00404"
  • Publicación
    A Comparison of Digital Modelling Techniques Analyzing a Section of Qhapaq Nan
    (IEEE Xplore, 2015)
    Retamozo, S
    ;
    Arce, D
    ;
    Aguilar, R
    ;
    Zvietcovich, F
    ;
    Quintana, M
    ;
    Castaneda, B
    ;
    Angeles, S
    Total Station has been one of the most common acquisition devices for achieving maps through topographic survey. Nowadays, Terrestrial Laser Scanner (TLS) and Photogrammetry are commonly used to generate accurate meshes. In addition, commercial products such as Kinect offer low cost technology to acquire point-cloud information. The present paper aims to measure the accuracy of these digital modelling techniques by employing elevation contour maps, surface deviations and distance measurements. For this purpose, a 450 m sector of the Qhapaq Nan located in Lima-Peru, was selected as a case of study. A camera-enabled drone was used for acquiring pictures to obtain a high-resolution photogrammetric model. Subsequently, a 3D survey of the monument was conducted with a time-of-flight laser scanner. Contour elevation lines where extracted from TLS, Photogrammetry and Total Station models at the same depths in order to determine the precision of photogrammetry and laser scanner reconstructions. In addition, geometrical comparisons were performed among the 3D models above mentioned and the Kinect sensor. The comparison showed that TLS is the most accurate tool for 3D reconstruction. However, Photogrammetry and Kinect provided errors of less than one centimeter in accuracy.
  • Publicación
    A mixed methodology for detailed 3D modeling of architectural heritage
    (Tayler & Francis Group, 2016)
    Arce, D
    ;
    Retamozo, S
    ;
    Aguilar, R
    ;
    Castaneda, B
    Architectural and archaeological heritage is the most representative part of history of a country. For these reasons, over the years, the scientific community has focused its attention on three-dimensional (3D) modeling techniques, conservation, structural analysis and other related applications. Laser scanning, shape from structured light, shape from silhouette, shape from video and shape from photometry are among the techniques that have been used over the past years for 3D modeling of archeological heritage. The application of 3D modeling can be found in several disciplines. In Architecture, it is used to generate digital models from which drawings can be produced. Aerial and terrestrial photogrammetry Photogrammetry is commonly used for digitization of 3D models in different applications due to the fast acquisition process and low cost of equipment. Digitization of structures with terrestrial laser scanner requires the usage of a correct methodology in order to generate a complete 3D model.
  • Publicación
    Structural damage assessment of Huaca de la Luna, Peru: Preliminary results from ongoing multidisciplinary study
    (Pontificia Universidad Católica del Perú PUCP, 2016)
    Aguilar, R
    ;
    Zavala, G
    ;
    Castaneda, B
    ;
    Lopez, S
    ;
    Retamozo, S
    ;
    Montesinos, M
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    Pando, MA
    ;
    Dong, Y
    ;
    Perucchio, R
    This paper presents a comprehensive update of the structural damage assessment of the complex Huaca de la Luna, which is one the most important heritage monuments in northern Peru, and was built by the Moche civilization from 100 AD to 650 AD. The paper presents an overview of the initial hypothesis identified to explain the nature of the damage encountered in the Huaca. The results highlight how the combination of material evaluations, coupled with geotechnical investigations have been essential in constructing a series of 2D nonlinear FE models for the structural analyses under gravitational loading of the Huaca. Results of the analyses conducted to date show the importance of a multidisciplinary approach for assessing the structural safety in these types of buildings. © 2016 Taylor & Francis Group, London.
  • Publicación
    Vibration-based nondestructive testing as a practical tool for rapid concrete quality control
    (Elsevier, 2016)
    Aguilar R.
    ;
    Ramírez E.
    ;
    Haach V.G.
    ;
    Pando M.A.
    This paper involves a practical approach to perform quality-control/quality-assessment of concrete using vibration-based NDT. The first component is the analysis of compressive strength and dynamic E-modulus of concrete samples from various construction projects. The second component involves continuous measurements of E-Moduli as a function of curing time in laboratory-controlled specimens. The experimental program allowed proposing a correlation to predict the expected static and dynamic E-modulus at 28 days from their measurement at any instant of the curing process. A similar relationship is proposed to predict compressive strength at 28 days based on the dynamic E-modulus measured at earlier ages.