Non-destructive assessment, full-scale load-carrying tests and local interventions on two historic timber collar roof trusses

Branco, Jorge M.; Sousa, Hélder S.; Tsakanika, Eleftheria

doi:10.1016/j.engstruct.2017.02.053

Cited by 47 publications

(21 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The experimental strategy of this investigation consisted of analyzing a representative beam by beam sample of the roof framework (Cestari et al, 2010;Branco et al, 2017). In this case study, the variability factor is limited to the genus Pinus and to the comparison of two representative samples of sawn wood from trees originating from ecologically similar regions.…”

Section: Methodsmentioning

confidence: 99%

Structural Analysis of Wood Beams by Non-Destructive Methods in Restoration Works of the Cathedral of Morelia, Mexico

Gómez

Castellanos

González

2019

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

View full text Add to dashboard Cite

<p><strong>Abstract.</strong> In the ceiling framework of the capitular hall of the Cathedral of Morelia, the overall state of the beams of the ceiling framework of the capitular hall of the Cathedral of Morelia was diagnosed as deplorable, for which a replacement was put underway for more recently sawed beams. The focus of this investigation was to determine the humidity content of the wood, its density, the wave velocity, the dynamic modulus and the quality factor of a sample of five new beams. These parameters were compared to the medium of five old beams. For the density, wave velocity, dynamic modulus and rigidness, there were no differences found between the old and new beams. The results suggest that the mechanical and physical properties of the new wood beams are equivalent to those of the older ones. Consequently, the strategy of substituting old and deteriorated wood beams for recently sawed ones was successful and complies with the requirements of the International Council of Monuments and Sites as referred to in the principles for the preservation of historical wooden structures.</p>

show abstract

Section: Methodsmentioning

confidence: 99%

Structural Analysis of Wood Beams by Non-Destructive Methods in Restoration Works of the Cathedral of Morelia, Mexico

Gómez

Castellanos

González

2019

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

View full text Add to dashboard Cite

show abstract

“…Ultrasound technology applies in engineering analysis of historical wooden structures to measure the wave velocity (Íñiguez-González et al 2015, Kloibe ret al 2016, Branco et al 2017, Riggio et al 2018. Likewise, ultrasound is used in solid wood mechanical (Tipper et al2016) and laminated (Sanabria et al 2011) characterization.…”

Section: Ultrasound Characterizationmentioning

confidence: 99%

Laminated Wood and Multimaterial Wood – Adhesive Meshas Replacements of Solid Wood in Restoration of Historical Buildings

Alquicira

Castellanos

Sánchez

2019

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

View full text Add to dashboard Cite

Wooden structure restorationwork in historical buildings requires substitution and/or reparation of structural elements. The aim of this investigation is to compare the density, wave velocity, dynamic module, and quality factor intest pieces of solid wood, laminated wood and a multimaterial of P. pseudostrobus. The work hypothesis proposes that dynamic modules of laminated wood and multimaterial laminated wood reinforced with stainless steel mesh are, at least, equal to solid wood. Small dimension test pieces made of solid wood, laminated wood, and multimaterial wood elaborated with the species P. pseudostrobus were prepared. Humidity content and apparent density of wood were determined. Ultrasound tests in radial, tangential, and longitudinal direction were doneand wave velocity, dynamic module, and quality factor were determined. Empiric evidence indicates that wave velocity, dynamic module, and quality factors are different with the three kinds of test pieces. Laminated wood and multimaterial wood characteristics are similar to P. pseudostrobus solid wood; so that the two compound material have good expectations to substitute some pieces that work as resistance elements in wooden structures.

show abstract

“…Традиционные численные методы [17][18][19], хотя и позволяют получить решения достаточно сложных задач, имеют ограничения, например, по числу панелей. Это связано с накоплением погрешности вычислений, растущей с увеличением количества элементов [20]. В статье [21] предлагается алгоритм преодоления некоторых численных проблем такого типа.…”

Section: Introductionunclassified

“…Traditional numerical methods [17][18][19], although they allow obtaining solutions to complex issues, have limitations, for example, in the number of panels. This is due to the accumulation of calculation errors, which increases with an increase of the number of the elements [20]. The article [21] proposes an algorithm for overcoming some numerical problems of this type.…”

Section: Introductionmentioning

confidence: 99%

Analytical Solution of the Frequency of the Load Oscillation at an Arbitrary Girder Node in the System Maple

Kirsanov

Tinkov

2019

Stroitel’stvo: nauka i obrazovanie

View full text Add to dashboard Cite

Introduction. We study the oscillations of a massive load on a planar statically definable symmetric truss of a regular type with parallel belts. Truss weight is not included. Free vertical oscillations are considered. The stiffness of the truss rods is assumed to be the same, the deformations are elastic. Lattice of the truss is double with descending braces and racks. New in the formulation and solution of the problem is the analytical form of the solution, which makes it possible in practice to easily evaluate the frequency characteristics of the structure depending on an arbitrary number of truss panels and the location of the load. Materials and methods. The operators and methods of the system of computer mathematics Maple are used. To determine the forces in the rods, the knotting method is used. The common terms of the sequence of coefficients of solutions for different numbers of panels are obtained from solving linear homogeneous recurrent equations of various order, obtained by special operators of the Maple system. Dependence on two arbitrary natural parameters is revealed in two stages. First, solutions for fixed load positions are found, then these solutions are summarized into one final formula for frequency. Results. By a series of individual solutions to the problem of load oscillation using the double induction method, it was possible to find common members of all sequences. The solution is polynomial in both natural parameters. Graphs constructed for particular cases, showed the adequacy of the approach. The discontinuous non-monotonic nature of the intermittent change depending on the number of truss panels and some other features of the solution are noted. Conclusions. It is shown that the induction method, previously applicable mainly to statics problems with one parameter (number of truss panels), is fully operational to the problems of the oscillations of system with two natural parameters. It should be noted that significant labor costs and a significant increase in the time symbolic transformations in such tasks

show abstract

Non-destructive assessment, full-scale load-carrying tests and local interventions on two historic timber collar roof trusses

Cited by 47 publications

References 19 publications

Structural Analysis of Wood Beams by Non-Destructive Methods in Restoration Works of the Cathedral of Morelia, Mexico

Structural Analysis of Wood Beams by Non-Destructive Methods in Restoration Works of the Cathedral of Morelia, Mexico

Laminated Wood and Multimaterial Wood – Adhesive Meshas Replacements of Solid Wood in Restoration of Historical Buildings

Analytical Solution of the Frequency of the Load Oscillation at an Arbitrary Girder Node in the System Maple

Contact Info

Product

Resources

About