Design and assembly automation of the Robotic Reversible Timber Beam

This study aimed to investigate the moment carrying behavior of typical Tibetan timber beam-column joints under monotonic vertical static load and also evaluate the influence of length ratio of Gongmu to beam (LRGB) and dowels layout on the structural performance of the joint. Six full-scale specimens were fabricated with same construction but different Gongmu length and dowels position. The moment carrying performance of beam-column joints in terms of failure mode, moment resistance, and rotational stiffness of joints were obtained via monotonic loading tests. Test results indicated that all joints are characterized by compressive failure perpendicular to grain of Ludou. Additionally, it was found that greater LRGB leads to greater initial rotational stiffness and maximum moment of the joint by an increase of restraint length for beam end; however, offsetting dowels toward column resulted smaller stiffness and ultimate bending moment of joints, particularly, offsetting Beam-Gongmu dowels toward column changed the moment-rotation curve pattern of the beam-column joint, accompanied by a hardening stiffness at last phase. Furthermore, a simplified trilinear model was proposed to represent the moment-rotation relationship of the typical Tibetan timber beam-column joint.

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Datenbank für Betriebsmittel der Montageautomatisierung / Data base for operational equipment for assembly automation

ZWF Zeitschrift für wirtschaftlichen Fabrikbetrieb ◽

10.1515/zwf-1990-850705 ◽

1990 ◽

Vol 85 (7) ◽

pp. 352-356

Author(s):

H. Reinisch

Keyword(s):

Data Base ◽

Assembly Automation

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Methodology for inspection of wood pathologie using ultrasonic pulses

CERNE ◽

10.1590/s0104-77602012000300016 ◽

2012 ◽

Vol 18 (3) ◽

pp. 479-486 ◽

Cited By ~ 2

Author(s):

Edgar Vladimiro Mantilla Carrasco ◽

Amanda Rocha Teixeira

Keyword(s):

Nondestructive Testing ◽

Historic Buildings ◽

Structural Elements ◽

Timber Beam ◽

Ultrasound Technique ◽

Glued Laminated Timber ◽

Overall Stability ◽

Complementary Techniques ◽

Wooden Structures

Awareness has been on the rise on the part of society about the importance of wooden structures, in particular historic buildings. This concern is reflected in continued maintenance of historic heritage and has been increasingly leading professionals working in the field of wooden structures to seek improved techniques for inspection of such structures. Methods involving nondestructive testing (NDT) are the most recommended for inspection, as they do not affect the relevant architecture and thus help maintain the integrity and originality of the building. Among the various existing NDT methods, a widespread and promising option is the ultrasound technique. This work introduces a methodology for inspection of wooden structural elements using ultrasonic pulses. The methodology was applied to a glued laminated timber beam with signs of decay on its interior. Ultrasound results helped map the damaged areas of the beam on a plane by using isochromatic patterns. The contribution of this work is a methodology to help investigate wood pathologies which, in combination with other complementary techniques, will allow more accurate and reliable evaluations of wooden structures, avoiding unnecessary replacement of sound structural elements mistakenly presumed to be damaged, or else ensuring maintenance of extremely deteriorated elements that would otherwise compromise the overall stability of the structure.

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