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Caneparo L

Computer-integrated construction of timber structure

Abstract: The paper presents the integrated information system supporting design, manufactory and construction of a large glued laminated timber structure in Aosta, Italy. Design, the structure was completely computer modelled with in-house developed software, which considered both torsion and curvature constraints of timber. Manufactory, further proprietary software was used to develop, on a plane, the shape of each timber layer without torsion and curvature. The profiles were converted into CNC instructions to cut the timber leaves. Construction, to manage and verify the process onsite RF Ethernet LAN was established to allow bi-directional online communication between total station, radio frequency identification and the information system.

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Full text: content.pdf (610,631 bytes) (available to registered users only)

Series: w78:2000 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.analysis (0.028666) class.communication (0.011615) class.social (0.007978)
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Permission to reproduce these documents have been graciously provided by Icelandic Building Research Institute. The assistance of the editor, Mr. Gudni Gudnason, is gratefully appreciated


Côté S,Trudel P,Snyder R,Gervais R

An augmented reality tool for facilitating on-site interpretation of 2d construction drawings

Abstract: Two-dimensional drawings are the only type of design document that is legally approved for construction. For large construction projects, because of the drawings’ high level of abstraction and because of the very large number of drawings, interpretation and correct understanding of drawings is identified by some construction firms as their greatest single challenge. To do the building work as designed, the builder must understand the meaning of the drawings, and this comes from establishing a visual correspondence between the abstract 2D drawings and the physical environment. Unfortunately, that correspondence may not be easy to obtain when the structure of interest is not clearly visible from the user’s position (occlusion, differences between the model and the actual building, etc.). In this paper, we propose a technique that enables the display of 2D drawings into the real world using augmented reality in a way that can overcome those kinds of limitations. The tool enables users to browse the real world in search of drawings, or to request the real location that a specific drawing represents, and to view each drawing within a context composed of a combination of captured photographic reality and designed virtual modeling. Augmentation is achieved by displaying the drawing using either an animated sliding plane that shows it being inserted into the real building, or a clipping technique that displays the drawing inside a clipped 3D model which in turn is inside the real building. The 2 techniques were implemented and tested in a situation where section drawings are visualized from the outside of the building. Our results show that those visualization techniques provide good 3D perception in a representation that is easy to understand visually. They also enable quick localization of the drawing in its environment, and provide a better understanding of the drawing with respect to its context: the 3D model and the built environment.

Keywords: Augmented reality,panorama,construction,2D drawings,design,3D model

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Series: convr:2013 (browse)
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Elenas A

Computer supported evaluation of interrelations between seismic acceleration parameters and the behaviour of structures

Abstract: This paper describes first some acceleration parameters of seismic excitations. Next, a nonlinear analysis of a reinforced concrete plane frame is carried out to elaborate the influence of the aforementioned parameters on the behaviour of the structure. Damage indicators in the form of cross sectional ductility demand are then evaluated and correlated with the strong motion characteristics. Furthermore, the ductility demand is compared with the cross sectional ductility supply of the structure. The aim of this computer supported study is t o extract among the several here presented seismic parameters, those which have drastic affection on the damage indicators of the structures.

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Series: ecce:1997 (browse)
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Mahmoud K M

Fracture behavior of welded steel bridge components

Abstract: This paper presents the investigation of fracture behavior of welded steel bridge components. The interaction between a macroscopic crack and continuously distributed microscopic damage in a power-law hardening material is studied by accounting for void accumulation in the vicinity of the crack-tip. The damage is assumed to be concentrated to a small circular zone centered at the crack-tip, where growth and coalescence of microvoids are invoked. A component, loaded in Mode-I under plane strain condition, is considered. The deformation theory of plasticity is employed to obtain the stress, strain and displacement fields ahead of the tip of the crack, where a damage variable, D, is introduced to describe the mechanical effect of distributed microscopic damage. Only isotropic damage is considered in this paper. For monotonic loading, the external applied stress for small-scale and large-scale yielding solutions is found to be proportional to a0 -1/ (n+1), where a0 is half the initial crack length and n is the strain-hardening exponent of the material. This reduces to Griffith's classical result for elastic material. For fatigue crack propagation under small-scale yielding, the effects of initial crack size, final crack size and the cyclic stress level on the service life of welded steel bridge components are assessed and found to be in good agreement with Paris power-law for fatigue crack growth.

Keywords: fracture behavior, bridge components, damage mechanics, microvoids, Mode-I, HRR singularity

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Series: itaec:2003 (browse)
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Yasumuro Y,Kusakabe S,Dan H,Fuyuki M

3d barrier-free verification for wheelchair access

Abstract: This paper proposes a new methodology for identifying barriers encountered by wheelchair users in daily life spaces. Currently, barrier-free designs are required not only for newly constructed buildings, but also when renovating existing facilities and public spaces. However, the arrangement of furniture, equipment, and many other objects in a space often impose barriers, and even the simple bumps and steps on pathways can obstruct wheelchair passage. Furthermore, it is often difficult for administrators to envisage the full reality of barriers in their facilities because potential obstacles can be created inadvertently by a variety of objects that have complicated three-dimensional (3D) geometries. In such cases, their existence will normally remain unknown until someone actually tries to transit the area using a wheelchair. Our approach aims to capture the overall dimensions of target spaces by collecting and combining depth images taken using a hand-held RGB-D camera (also commonly referred to as a ranging camera), and then to navigate a virtual wheelchair through the target space in a computer simulation to check for obstacles. The practical egomotion capabilities of RGB-D camera sensors within actual environments make it possible to achieve real-time simultaneous localization and mapping (SLAM) functionality, which is necessary for creating accurate 3D location maps. The Microsoft Kinect™ sensor, which was originally designed as a user interface for home-use video games, is a good example for a low-cost, compact RGB-D camera. Since the Kinect device is sufficiently compact for use when capturing arbitrary objects in situ, we adopted it for use in our study and applied a SLAM technique to perform barrier checks. Our simulation employs 3D projections of all objects and wheelchair transit volumes onto a floor plane in order to detect potential obstacles. We implemented our proposed method on a laptop personal computer (PC) and collected data from actual classroom and common space locations in a university. The experimental results of our method showed effective functionality in terms of practicality and usability.

Keywords: Wheelchair user,Barrier-free,RGB-D camera,Free-hand scan,Obstacle check,3D model

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Series: convr:2013 (browse)
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Youyi Feng, Fei Dai and Jiaqing Zhao

Comparing Feature Matching Algorithms for Measuring In-Plane Strains on Civil Infrastructures

Abstract: Maintaining structural integrity of civil infrastructures such as bridges and tunnels is always an essential task for civil engineers. Collapse or damage of these infrastructures may lead to a tremendous amount of painful injuries, casualties, and societal losses. This paper reported the work on evaluating optimal feature matching algorithms for development of visual sensing-based techniques to measure in-plane deflections and strains in order to facilitate monitoring and evaluation of integrity of civil infrastructures in a cost-effective way. A series of experiments were conducted in which three algorithms Digital Image Correlation (DIC), Scale-Invariant Feature Transform (SIFT) and Speeded-Up Robust Features (SURF) were compared. The result indicated that DIC has superiority among the three algorithms. To further assess the accuracy of DIC, a high-speed industrial camera was then used to capture a series of continuous image frames of deformed real-world scenarios. The DIC algorithm was adopted in the feature detection and tracking process, and in-plane displacement and strains were calculated and compared with the ground truth. The result indicated that the DIC-based method can achieve highly accurate performance in measuring in-plane deflections and strains for civil infrastructures and holds potential to the development of visual sensing enabled structural health monitoring.

Keywords: Image-Based Methods, Structural Health Monitoring, Visual Sensing, Non-Contact Measurements, Comparative Study

DOI: https://doi.org/10.24928/JC3-2017/0165

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