Relevant bibliographies by topics / Diagnostics of timber structures

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
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Academic literature on the topic 'Diagnostics of timber structures'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Diagnostics of timber structures"

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Kuklík, Petr, Lukáš Velebil, Anna Gregorová, and Petr Svora. "MONITORING AND PROTECTION OF TIMBER-CONCRETE BRIDGES." Acta Polytechnica CTU Proceedings 22 (July 25, 2019): 57–61. http://dx.doi.org/10.14311/app.2019.22.0057.

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The majority of timber bridges for ordinary road traffic are often made as timber-concrete composite structures. Concrete slab is something like as umbrella for timber. The reason for problems in timber-concrete bridges is nearly always poor detailing for durability and neglected maintenance. Mainly all aspects of timber protection and maintenance should therefore be considered even during the planning phase of bridge. Paper deals with evaluation of timber properties, system of opto-fiber sensors for monitoring and diagnostics of mechanical stress of timber-concrete bridges, and degradation of timber due to UV radiation, atmospheric conditions and biological agents after application of photocatalytic materials on surface.
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Macchioni, Nicola, Massimo Mannucci, Roberto Olmi, Sabrina Palanti, and Cristiano Riminesi. "Microwave Reflectometric Tool for Non-Destructive Assessment of Decay on Timber Structures." Advanced Materials Research 778 (September 2013): 281–88. http://dx.doi.org/10.4028/www.scientific.net/amr.778.281.

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Timber structures can be degraded during their life both by structural problems and, mainly, by biological degradation factors like fungi, and insects (Coleoptera and termites). The occurrence of these biodegradation agents leads, in the absence of appropriate maintenance interventions, to the loss of their structural integrity. Furthermore, if these biological agents decay old buildings, the loss of mechanical resistance of timber structures can be added to loss of cultural heritages. Just in these contexts an early evaluation of decay is crucial to design remedial treatments and a less invasive restoration intervention. This work presents a new microwave diagnostic system for the in situ evaluation of timber structures based on microwave reflectometry, i.e on the measurement of the microwave reflection coefficient as a function of frequency. The continuous-wave (CW) microwave signal is launched by a double-ridged antenna, which also measures the wave reflected by the material under investigation. The measurement system allows diagnosing the effects of biodegradation during a first quick survey in a non-destructive and non-invasive manner. Measurements on laboratory models demonstrated the feasibility of the method. Results obtained on timber beam sections, compared with the findings of traditional investigation methodologies, demonstrate the potentiality of microwave reflectometry, suggesting its usefulness for decay detection and as a support to invasive diagnostic tools.
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Feci, Elisabetta, Massimo Mannucci, and Sabrina Palanti. "Diagnostic Evaluation of Insect Attack on Existing Timber Structures: A Review of some Case Studies." Advanced Materials Research 778 (September 2013): 1020–27. http://dx.doi.org/10.4028/www.scientific.net/amr.778.1020.

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The problem of wood-boring insect attacks is gaining greater interest in Italy today. Wood-boring insects (Coleoptera, termites) often cause both structural and aesthetic damage on wooden structures which can sometimes give rise to human health concerns. Possible causes of current insect infestations include the use of timber originating from plantations, as well as bad post-felling practices such as late harvesting and stocking in unsuitable places before final processing. In the past, these insects were not thought to pose an economic threat to timber in service in Italy, but, in recent years, they have become a problem. The aim of this paper is to report on case studies concerning the occurrence of these unusual wood-boring insects on timber in service and, on the basis of the Authors experience, to formulate an in situ inspection protocol. The species we are dealing with in the case studies are: Bostrichus capucinus, family Bostrichidae, associated with Lyctus spp. (Fam. Lyctidae) and Lymexylon navale, family Lymexylonidae, belonging to the group of the so-called ambrosia beetles or pinhole borers. All these species were found on hardwoods, where they had bored into the sapwood except for L. navale which was also able to bore into heartwood, causing major concerns about its potential danger to timber in service. A technical integrated approach in evaluating insect attacks on on-site timber elements is also described here. The assessment is based on different methods, i.e. visual inspection and acoustic detection. This procedure is proposed as a basis for the development of an intervention protocol in the early stages of infestation.
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Jasieńko, Jerzy, Tomasz Nowak, and Katarzyna Hamrol. "Selected Methods of Diagnosis of Historic Timber Structures – Principles and Possibilities of Assessment." Advanced Materials Research 778 (September 2013): 225–32. http://dx.doi.org/10.4028/www.scientific.net/amr.778.225.

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The paper presents a survey of state-of-the-art nondestructive and semi-destructive diagnostic techniques of testing timber structures and examples of their application. Nondestructive testing is a field of study which covers: identifying the mechanical and physical properties of materials and structural components, detecting material defects and discontinuities, and measuring the geometric dimensions of objects without affecting their performance. The nondestructive and semi-destructive methods are described in a systematic manner and the relevant equipment, technology and applications are discussed. The paper focuses on acoustic methods, resistance drilling techniques and radiography, which are suitable for detecting internal defects, decay and cracks, determining the location and dimensions of degraded areas and assessing the mechanical properties of structural timber members. Much attention is devoted to the techniques that are used in practice and have shown significant promise for future development. The results of several drilling resistance tests carried out on historic timber structures are presented.
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Daňková, Jana, Tereza Murínová, and Pavel Mec. "The Existing Timber Structures – Possibilities and Limits of Diagnostic Methods in Assessment Process." Advanced Materials Research 923 (April 2014): 17–24. http://dx.doi.org/10.4028/www.scientific.net/amr.923.17.

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The wood is traditionally been applied as the building material in building and bridge construction. The number of applications of wood in building structures increases in recent years. According with this trend, the emphasis is on the development of diagnostic and monitoring methods for existing wood structures. In the paper, published results of a survey of existing wood structures in relation to the evaluation of qualitative and quantitative characteristics of the investigated structures. There are finally discussed the possibility to reproduce the results of non-destructive measurement relative to evaluate the strength characteristics of wood.
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Drdácký, Miloš, and Michal Kloiber. "In Situ Compression Stress-Deformation Measurements along the Timber Depth Profile." Advanced Materials Research 778 (September 2013): 209–16. http://dx.doi.org/10.4028/www.scientific.net/amr.778.209.

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The paper presents a novel concept and a prototype of a diagnostic tool for in-situ assessment of timber in existing structures and buildings. The device enables direct determination of conventional compressive strength and modulus of deformation in arbitrary depth along timber profile. The measurement of the stress-deformation relationship is performed in a prepared hole of a very small diameter by means of a special small size symmetrical loading jack. Testing and verification of the new device behaviour during loading of wood along the fibres has been carried out on fir which is the most frequent wood species in European buildings. The comparison of stress-strain diagrams acquired by means of the new device with those measured in compliance with the European standard for testing of wood shows a very good correlation including the determination of the compressive strength values. This semi-destructive method causes a very gentle damage and can be also used for the assessment of historic timber structures.
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Diodato, Maria, Nicola Macchioni, Michele Brunetti, Benedetto Pizzo, Michela Nocetti, Paolo Burato, Lorena Sozzi, Elisa Pecoraro, Fernando Vegas López-Manzanares, and Camilla Mileto. "A Peculiar Spanish Timber Floor, the "Revoltón": A Diagnostic Example at the "Palacio del Marqués de Benicarló"." Advanced Materials Research 778 (September 2013): 1064–71. http://dx.doi.org/10.4028/www.scientific.net/amr.778.1064.

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The paper deals with the application of the Italian method for assessing on-site and diagnosing timber elements to a distinctive Spanish type of horizontal structure called “revoltón” i.e. jack arch floor. As in Spain does not exist a specific regulation for the on-site diagnosis of timber elements, this analysis was performed according to the Italian standard UNI 11119. Due to the peculiar features of the jack arch floor some modifications were applied to the method.During spring 2012 the authors had the opportunity to carry out a pilot project by making a diagnostic analysis on a whole three stories building. The building, “Palacio del Marqués de Benicarló”, located in Spain in the town of Benicarló, between Barcelona and Valencia, was erected during the second half of the XVIII century. It maintains the original internal distribution and structure, and it is characterized by precious ceramic decorations on walls and floors. All the horizontal structures studied inside the palace were jack arch floor except the roof structure that was also made of timber.The results of the project described in the paper clarify the specific problems of the horizontal structures and the roof surveyed during the fieldwork. These results are accompanied by several plans that represent the information recovered on-site and lead to a complete assessment of the structures. The plans include the grading based on wood defects, the local moisture content of wood, the superficial and inner decay due to insects and rot and the deformation of the joists. In this way it was possible to locate the areas of the palace where more problems were concentrated, and better understand the causes and origin of the damages.
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Podestà, Stefano, Federica Pompejano, and Gerolamo Stagno. "The Wooden Roof of Banesa e Skendulate in Gjirokastra, Albania: The Role of the Diagnostic Test Campaign in the Structural Safety Evaluation." Advanced Materials Research 778 (September 2013): 911–18. http://dx.doi.org/10.4028/www.scientific.net/amr.778.911.

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Banesa e Skendulate is part of the historical center of the museum-city of Gjirokastra (Albanian UNESCO World Heritage), an unique and well-preserved example of Albanian urban vernacular architecture influenced by the ottoman architectural style, situated in a strategic position in the valley of the Drino. Banesa e Skendulate represents not only the typical compositional characteristics of this architecture but also a culture and a lifestyle deeply rooted in its own traditions. As its known, historic roofings are load-bearing structures made of timber according to an empirical and intuitive design, without structural engineering theory support, and Banesa e Skendulates roof is a clear example of the posts and beams system and shows the ability of the local craftsmen to deal with the support of heavy stone roofing. In the following paragraphs, will be presented the non-destructive diagnostic testing performed on the wooden structure of the roofing together with a detailed geometric and technological survey in order to recognize the structural system, its behavior and pathology and then process the analytical 3D model. Furthermore, the paper deals with the problem arose as consequence of the interpretation of the results obtained by the diagnostic tests, concerning the determination of the classes of resistance attached to ancient structural wooden elements that, for obvious reasons, cannot be classified according to the strength classes defined by the regulations for new timber constructions. Applying the reference strength values classified for the new timber elements to the historic ones, can cause a heavy penalty in terms of structural safety verification of the roof; that is why the role of the diagnostic test campaign should guide the reinforcement project applying reference values determined on the real conditions of the wooden elements.
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De Ponti, Riccardo D., Lorenzo Cantini, and Laura Bolondi. "Evaluation of the masonry and timber structures of San Francisco Church in Santiago de Cuba through nondestructive diagnostic methods." Structural Control and Health Monitoring 24, no. 11 (February 21, 2017): e2001. http://dx.doi.org/10.1002/stc.2001.

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Bajno, Dariusz, Agnieszka Grzybowska, and Łukasz Bednarz. "Old and Modern Wooden Buildings in the Context of Sustainable Development." Energies 14, no. 18 (September 20, 2021): 5975. http://dx.doi.org/10.3390/en14185975.

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Construction is a powerful industry that is not indifferent to the environment. Neither the maintenance of buildings in a proper technical condition nor their eventual demolition is indifferent to the environment. The main threats to the environment are still the inefficient use of construction materials and energy needed for their production and installation, as well as the emission of harmful substances to the environment at the stage of operation of buildings and their demolition. This article discusses the importance of wood as a renewable material in terms of its physical and mechanical properties. The restoration of forest areas is of great importance to the global ecosystem and the sustainable development system, reducing the threat of global warming and the greenhouse effect by reducing CO2 levels. In addition, demolition wood can be reused in construction, can be safely recycled as it quickly decomposes, or can be used as a source of renewable energy. The preservation of existing timber-framed buildings in good condition contributes to a lower consumption of this raw material for repair, which already significantly reduces the energy required for their manufacture, transport, and assembly. This also reduces the amount of waste that would have to be disposed of in various ways. Both at the stage of design, execution, and then exploitation, one forgets about the physical processes taking place inside the partitions and about the external climatic influences of the environment (precipitation, water vapor, and temperature) on which the type, intensity, and extent of chemical and biological corrosion depend to a very high degree. This paper presents examples of the influence of such impacts on the operational safety of three selected objects: a feed storehouse and an officer casino building from the second half of the nineteenth century and an 18th century rural homestead building. The research carried out on wooden structures of the above-mentioned objects “in situ” was verified by means of simulation models, which presented their initial and current technical conditions in relation to the type and amount of impact they should safely absorb. Moreover, within the framework of this paper, artificial intelligence methods have been implemented to predict the biological corrosion of the structures studied. The aim of the paper was to draw attention to the timber already built into buildings, which may constitute waste even after several years of operation, requiring disposal and at the same time the production of a substitute. The purpose of the research carried out by the authors of the article was to examine the older and newer buildings in use, the structures of which, in whole or in part, were made of wood. On a global scale, there will be considerable demand for the energy required to thermally dispose of this waste or to deposit it in landfills with very limited capacity until its complete biological decomposition. These energy demands and greenhouse gas emissions can be prevented by effective diagnostics of such structures and the predictability of their behaviour over time, with respect to the conditions under which they are operated. The authors of the article, during each assessment of the technical condition of a building containing wooden elements, analysed the condition of their protection each time and predicted the period of their safe life without the need for additional reinforcements or replacement by others. As the later reality shows, it is a very effective method of saving money and energy.
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Dissertations / Theses on the topic "Diagnostics of timber structures"

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Kolláriková, Simona. "Stavební průzkum a hodnocení stavu konstrukce." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2021. http://www.nusl.cz/ntk/nusl-433463.

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The diploma thesis deals with building survey of the New synagogue in Velké Meziříčí. It is focused on diagnostics of timber structures using non-destructive and semi-destructive testing methods, such as visual inspection, moisture content measurement, penetration depth of a steel pin measurement and endoscopy. The aim of the thesis is to evaluate the condition of the timber structures according to the results of the building survey.
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Vitásková, Petra. "Studie chování konstrukcí dřevěných lávek." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226646.

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Master’s thesis „Behavioral studies of the timber footbridges structures“ deals with static models of timber footbridges. This thesis mainly consists of the behavioral study of historical timber footbridge in the village of Černvír in Vysočina. Based on the actual design of the bridge a three-dimensional beam model was created. This thesis also includes two contemporary alternatives of timber covered bridges. The individual structural elements were assessed according to the applicable standards. To analyze the model FEM program SCIA Engineer 2012 was used.
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Labonnote, Nathalie. "Damping in Timber Structures." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for konstruksjonsteknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18168.

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Key point to development of environmentally friendly timber structures, appropriate to urban ways of living, is the development of high-rise timber buildings. Comfort properties are nowadays one of the main limitations to tall timber buildings, and an enhanced knowledge on damping phenomena is therefore required, as well as improved prediction models for damping. The aim of this work has consequently been to estimate various damping quantities in timber structures. In particular, models have been derived for predicting material damping in timber members, beams or panels, or in more complex timber structures, such as floors. Material damping is defined as damping due to intrinsic material properties, and used to be referred to as internal friction. In addition, structural damping, defined as damping due to connections and friction in-between members, has been estimated for timber floors. The thesis consists of six main parts. The first part is entitled “Contexts”, and is composed of four chapters. A general overview of the wood material and its structural use in buildings is presented in Chapter 1. Chapter 2 gives a thorough literature review on comfort properties of (timber) floors. Chapter 1 and Chapter 2 serve as justifications for the motivation of this work, expressed in Chapter 3, and the aim of the work, expressed in Chapter 4. The next part “Backgrounds” briefly describes the basic theories used along the thesis, for the analytical studies (Chapter 5), the experimental studies (Chapter 6), and the numerical studies (Chapter 7). The part “State of the art” is a general literature review on damping (Chapter 8). A particular accent is set on the derivation of various damping prediction models. The “Research” part summarizes the original research work. Chapter 9 briefly presents the background and main findings for each study, and Chapter 10 concludes and proposes suggestions for further research. The studies are detailed in four journal papers, which are integrally reported in the “Publications” part. Paper I focuses on the evaluation of material damping in timber beam specimens with dimensions typical of common timber floor structures. Using the impact test method, 11 solid wood beams and 11 glulam beams made out of Norway Spruce (Picea Abies) were subjected to flexural vibrations. The tests involved different spans and orientations. A total of 420 material damping evaluations were performed, and the results are presented as mean values for each configuration along with important statistical indicators to quantify their reliability. The consistency of the experimental method was validated with respect to repeatability and reproducibility. General trends found an increasing damping ratio for higher modes, shorter spans, and edgewise orientations. It is concluded from the results that material damping is governed by shear deformation, which can be expressed more conveniently with respect to the specific mode shape and its derivatives. Paper II deals with the prediction of material damping in Timoshenko beams. Complex elastic moduli and complex stiffness are defined to derive an analytical model that predicts the hysteretic system damping for the whole member. The prediction model comprises two parts, the first related to bending, and the second related to shear. Selected experimental damping evaluations from Paper I are used to validate the model and obtain fitted values of loss factors for two types of wood. The good agreement of the derived model with experimental data reveals an efficient approach in the prediction of material damping. In Paper III, a semi-analytical prediction model of material damping in timber panels is described. The approach is derived from the strain energy method and input is based on loss factors, which are intrinsic properties of the considered materials, together with material properties and mode shape integrals, whose calculation can easily be implemented in most finite element codes. Experimental damping evaluations of three types of timber panels are performed. These are particleboards, oriented strand board panels and structural laminated veneer panels. Fair goodness-of-fit between the experimental results and the prediction models reveals an efficient approach for the prediction of material damping in timber panels with any boundary conditions, knowing only the loss factors and the mode shapes. In Paper IV, dynamic properties of two timber floors are experimentally evaluated by impact method. Each floor uses one specified type of connectors, either screws or nails. A numerical model is developed using constrained degrees-of-freedom for the modeling of connectors. Numerical analyses have been performed, and show good agreement with experimental results. A procedure is written using the commercial finite element software Abaqus to predict material damping from a strain energy approach. Estimation of structural damping is performed as the difference between the experimentally evaluated total damping and the predicted material damping. The contribution from floor members to material damping is extensively investigated, and the needs for better prediction of damping are discussed. Specific details of some aspects of the work are included in the “Appendix” part.
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Magina, Miguel Jorge. "Historic timber roof structures." Master's thesis, Faculdade de Ciências e Tecnologia, 2013. http://hdl.handle.net/10362/11912.

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Dissertação para obtenção do Grau de Mestre em Engenharia Civil – Estruturas e Geotecnia
This dissertation covers the study of historic timber roof structures in Transylvania area - Romania, the structures type, its elements and connection variety between them. Procedures to study a structure of this category are approached. It is also referred semi and non-destructive tests that can be done to better understand the present wood characteristics, and potential reparation or strengthening solutions for the structure in case it is necessary. Ultimately a case study is analyzed and some intervention solutions are proposed for a gothic structure type in the nave of Huedin Reformed church.
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Cheng, Alexandra Adelle Hinkel. "Parametric design of timber shell structures." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/55140.

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Increasingly complex architectural geometries present new challenges for structural engineers. Collaborative, digital workflows which integrate 3D parametric architectural models with Finite Element Modelling software grant structural engineers a higher degree of geometric versatility and influence during the preliminary design phase. Through integrated parametric design models – also labelled “co-rationalized” – structural engineers may not only easily respond to rapid model variations and unusual assemblies, but also inform the building design from inception. This thesis presents an example of a project executed in a co-rationalized manner through architectural and structural collaboration, using both digitally-integrated and analog models, for the design and construction of solid timber shells structures using Cross-Laminated Timber (CLT) panels. By exploring a co-rationalized design process, timber engineering details are identified and integrated into the architectural model, and the role of structural engineer takes an active rather than reactionary role in the preliminary design stages. The result of this process using integrated parametric models was the design, fabrication, and assembly of a folded plate wall prototype and three CLT panels with double curvature. This research demonstrates how collaboration and integrated modeling enables the realization of the architectural versatility that mass-timber has to offer, and the efficacy which co-rationalized design and integrated models can bring to orthodox and unusual structures alike. As a consequence, this research serves as a precedent for structural detailing-based generative architecture and collaborative work in the future.
Applied Science, Faculty of
Civil Engineering, Department of
Graduate
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André, Alann. "Strengthening of timber structures with flax fibres /." Luleå : Luleå University of Technology, 2007. http://epubl.ltu.se/1402-1757/2007/61/.

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Man, Steve Ka Fai. "Semi-rigid behaviour of plane timber structures." Thesis, City University London, 2004. http://openaccess.city.ac.uk/8410/.

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It is common practice in the analysis of structural frames, to either assume that the joints are pinned or rigid. In fact the real behaviour of a joint is neither pinned nor rigid, and lies somewhere between the pinned and rigid assumption. This is referred to as the semi-rigid behaviour. Semi-rigidity not only refers to the rotational behaviour of the joint as commonly studied, but also in axial and shear actions. The moment distribution between pinned and rigid analysis differs substantially and therefore a more accurate method of modelling the semi-rigid joint is necessary to predict the overall structure response. The level of semi-rigid behaviour varies in different joints due to the material, construction and type of connector. The degree of semi-rigidity can be determined through physical tests. The type of joint for this study is the Metal Plate Connector (MPC) for timber trusses, 6 chosen connector used in residential trusses. An extensive test program was carried out in this study. Four different types of joints of a Queen truss were tested. In addition, the effect of combined loads on the joint characteristics was investigated. The loading arrangement in the tests allowed independent control of the bending moment and axial load. A novel approach is adopted to measure displacement, using high-resolution digital photogrammetry and specially developed software. The data produced gave details of timber movement in cartesian co-ordinates and measurement of plate deformation. From these tests, semi-rigid bending moment and axial stiffness values were determined for use in the theoretical study. An attempt to measure shear stiffness is also presented. Further tests were carried out on full-scale trusses under two different load conditions. The theoretical work comprises two approaches to truss modelling. The first is an automated structural analysis program, which accounts for non-linear semirigid joint characteristics derived from the joint tests using the Foschi power function. The effects of stability and geometrical non-linearity are also implemented into the analysis. The second approach calculates truss response using Finite elements where 2-D planar elements were used to calculate the response of the truss. Parameters for the connection strength are derived from the joint tests. Moment stiffness and axial stiffness values of the connections were determined. Combined load tests showed that there is indeed a measurable effect on joint stiffness and capacity due to combined loads, some of which actually contribute to the stiffness, but also some which are detrimental. There is good correlation between the truss test results and the FE model using semi-rigid joints. However, results of the simpler non-linear frame analysis, did not compare so well, but nevertheless exhibited fundamental characteristics of the truss.
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Griškevičius, Mečislavas. "High Temperature Effect On Resistance Of Timber Structures." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2010. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20101119_134602-29128.

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The present dissertation and its main subjects inquires into the pine and oak timber strength property changes-temperature relations. It also explores the behaviour of slender timber elements in axial compression at higher temperatures; and the comparative analysis of obtained results. The work seeks to accomplish the following major tasks: to obtain test data about the influence of high temperature on the properties of different natural – pine and oak – timber; to investigate the behaviour of slender timber elements under axial compression exposed to fire. Taking into account the investigated real fire effect to correct accordingly the existing in LST EN 1995-1-2 procedure for the fire resistance calculation of timber slender elements in compression. The dissertation consists of an introduction, five chapters, general conclusions, a list of references, a list of author’s publications on the dissertation subject, and 2 Annexes. Chapter 1 provides a literature review. It focuses on the publications inquiring into the loss of strength properties by timber at higher temperatures, the fire resistance of timber structures in compression. The chapter ends with the formulation of conclusions and the adjustment of research tasks. Chapter 2 offers the methodology of the research on strength properties of timber at higher temperatures, and the schemes of the developed testing equipment. Chapter 3 presents the procedure of the research on the behaviour of slender timber elements... [to full text]
Disertacijoje nagrinėjami pušinės ir ąžuolinės medienos stipruminių savybių pokyčių temperatūriniai sąryšiai bei medinių centriškai gniuždomų liaunų elementų elgsena veikiant aukštesnėms temperatūroms. Pagrindiniai tyrimo objektai yra Lietuvos spygliuočių ir lapuočių medienos savybių pokyčiai didėjant temperatūrai ir centriškai gniuždomų liaunų medinių elementų elgsenos veikiant kaitrai eksperimentiniai tyrimai bei rezultatų lyginamoji analizė. Darbe spręsti tokie pagrindiniai uždaviniai: gauti eksperimentinius duomenis apie aukštos temperatūros poveikį skirtingos natūralios – pušinės ir ąžuolinės – medienos savybėms, atlikti centriškai gniuždomų liaunų medinių elementų elgsenos ugnyje tyrimus. Atsižvelgiant į tyrinėtą tikrovišką gaisro poveikį patikslinti esamą EN 1995-1-2 medinių liaunų gniuždomų elementų atsparumo ugniai skaičiavimo metodiką. Disertaciją sudaro įvadas, penki skyriai, bendrosios išvados, naudotos literatūros ir autoriaus publikacijų disertacijos tema sąrašai ir du priedai. Pirmasis skyrius skirtas literatūros apžvalgai. Jame pateikta darbų, kuriuose nagrinėjamas aukštesnės temperatūros veikiamos medienos, stipruminių savybių mažėjimas ir kuriuose pateikiami gaisro sąlygomis gniuždomų medinių elementų laikomosios galios tyrimų rezultatai. Pabaigoje formuluotos išvados ir disertacijos tikslai ir uždaviniai. Antrajame skyriuje pateikta medienos stipruminių savybių aukštesnėse temperatūrose tyrimo metodika ir sukurtų nestandartinių bandymo įrenginių schemos... [toliau žr. visą tekstą]
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Tsai, Pin-Hui. "Seismic evaluation of traditional timber structures in Taiwan." Thesis, University of Bath, 2009. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.503662.

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Taiwan is located in a highly seismic zone and the historical “Dieh-Dou” timber buildings, constructed without following any code or standard, are prone to collapse under earthquake. These buildings are unique and represent the culture, heritage and art of Taiwan, therefore need to be preserved while minimizing unnecessary intervention that could damage their authenticity.
This research comprises a thorough investigation on the parameters influencing the seismic vulnerability of the Dieh-Dou timber frames in Taiwan, and propose a methodology of assessment and a strategy for strengthening validated through experimental testing and numerical analysis.
After review existing literature and post-earthquake surveys, the failure modes of the buildings are identified, showing that the dislocation of the elements of the frame from the joints is the primary source of damage. An experimental investigation is carried out comprising both rotational and translational tests on full scale joint specimens which, together with a parametric study undertaken with an appropriate FE simulation, demonstrates how both the rotational and translational stiffness of the joints play a key role in defining the behaviour of these structures.
Lateral force, response spectrum, and step-by-step pushover analyses are performed and compared with the post-earthquake survey of two Dieh-Dou buildings seriously affected by the 1999 Chi-Chi earthquake. The results show that the proposed FE modelling can successfully be employed to assess the vulnerability of the frames.
Based on a damage level approach, an assessment methodology is suggested that would allow to optimisation of the strengthening strategy, permitting protection these precious structures from future earthquakes while avoiding unnecessary interventions.
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Bradley, Alistair. "The flood resilience of light frame timber structures." Thesis, University of Bath, 2016. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.698981.

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Books on the topic "Diagnostics of timber structures"

1

Wilde, Krzysztof. Modal diagnostics of civil engineering structures. Gdańsk: Gdańsk University of Technology Publishers, 2008.

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Wilde, Krzysztof. Modal diagnostics of civil engineering structures. Gdańsk: Gdańsk University of Technology Publishers, 2008.

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V, Frolov K., and Menyailov A. I, eds. Vibroacoustical diagnostics for machines and structures. Taunton, Somerset, England: Research Studies Press, 1991.

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Radford, D. W. Composite repair of timber structures. Fort Collins, Colo: Dept. of Mechanical Engineering, Colorado State University, 2000.

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Mettem, C. J. Resin repairs to timber structures. High Wycombe: TRADA Technology Ltd., 2000.

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Wheeler, Andrea S. Resin repairs to timber structures. Oxford: Oxford Brookes Universit, 1998.

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Ross, Peter. Appraisal and repair of timber structures. London: Thomas Telford, 2002.

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Aicher, Simon, H. W. Reinhardt, and Harald Garrecht, eds. Materials and Joints in Timber Structures. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-7811-5.

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Branco, Jorge, Philipp Dietsch, and Thomas Tannert, eds. Reinforcement of Timber Elements in Existing Structures. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-67794-7.

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Weinand, Yves. Design of Integrally-Attached Timber Plate Structures. London: Routledge, 2021. http://dx.doi.org/10.1201/9781003139713.

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Book chapters on the topic "Diagnostics of timber structures"

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Staszewski, W. J., and G. R. Tomlinson. "Time-variant Methods in Machinery Diagnostics." In Safety Evaluation Based on Identification Approaches Related to Time-Variant and Nonlinear Structures, 62–74. Wiesbaden: Vieweg+Teubner Verlag, 1993. http://dx.doi.org/10.1007/978-3-322-89467-0_5.

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Thomas, Geoff. "Timber Structures." In Encyclopedia of Earthquake Engineering, 1–11. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-36197-5_112-1.

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Thomas, Geoff. "Timber Structures." In Encyclopedia of Earthquake Engineering, 3741–51. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-35344-4_112.

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Weinand, Yves. "Timber fabric structures." In Advancing Wood Architecture, 61–72. New York : Routledge, 2016.: Routledge, 2016. http://dx.doi.org/10.4324/9781315678825-5.

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Whitehead, Rob. "Stacking and Spanning Timber." In Structures by Design, 196–227. New York : Routledge, 2019.: Routledge, 2019. http://dx.doi.org/10.4324/9781315403144-9.

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Gilbert, Benoit P., Steven B. Hancock, and Henri Bailleres. "Thin-Walled Timber Structures." In Materials and Joints in Timber Structures, 119–28. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-7811-5_11.

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Bulleit, William M. "Applications in Timber Structures." In Probabilistic Structural Mechanics Handbook, 684–706. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4615-1771-9_29.

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Wickström, Ulf. "Temperature of Timber Structures." In Temperature Calculation in Fire Safety Engineering, 227–33. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-30172-3_15.

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Nelson, G. L., H. B. Manbeck, and N. F. Meador. "Light Timber Design." In Light Agricultural and Industrial Structures, 359–454. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4757-0411-2_10.

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Kupferschmidt, Claus, Mareike Strach, Holger Huhn, and Fabian Vorpahl. "Offshore Wind Structures." In Handbook of Technical Diagnostics, 505–18. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-25850-3_25.

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Conference papers on the topic "Diagnostics of timber structures"

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Jha, Ratneshwar, and Ryan Watkins. "Lamb Wave Based Diagnostics of Composite Plates Using Modified Time Reversal Method." In 50th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2009. http://dx.doi.org/10.2514/6.2009-2108.

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Nazarov, V. V., A. R. Lepeshkin, and Z. Guanghua. "A mathematical model of the creep process until the beginning time of the shape change." In MECHANICS, RESOURCE AND DIAGNOSTICS OF MATERIALS AND STRUCTURES (MRDMS-2020): Proceeding of the 14th International Conference on Mechanics, Resource and Diagnostics of Materials and Structures. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0037019.

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Spevak, L. F., and A. L. Kazakov. "Constructing numerical solutions to a nonlinear heat conduction equation with boundary conditions degenerating at the initial moment of time." In MECHANICS, RESOURCE AND DIAGNOSTICS OF MATERIALS AND STRUCTURES (MRDMS-2016): Proceedings of the 10th International Conference on Mechanics, Resource and Diagnostics of Materials and Structures. Author(s), 2016. http://dx.doi.org/10.1063/1.4967133.

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Buslaeva, I. I., and S. P. Yakovleva. "Development of a technique for the revelation of hidden periodicities in failure time series for predicting the operability of technical objects." In MECHANICS, RESOURCE AND DIAGNOSTICS OF MATERIALS AND STRUCTURES (MRDMS-2018): Proceedings of the 12th International Conference on Mechanics, Resource and Diagnostics of Materials and Structures. Author(s), 2018. http://dx.doi.org/10.1063/1.5084452.

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Tretyakova, Tatyana V., Valery E. Wildemann, and Evgeniy V. Lomakin. "Studying the influence of the loading system on the spatial-time inhomogeneity of inelastic deformation in metals by analyzing strain and temperature fields." In MECHANICS, RESOURCE AND DIAGNOSTICS OF MATERIALS AND STRUCTURES (MRDMS-2016): Proceedings of the 10th International Conference on Mechanics, Resource and Diagnostics of Materials and Structures. Author(s), 2016. http://dx.doi.org/10.1063/1.4967053.

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Ovchinnikov, N. P., V. V. Portnyagina, and M. P. Sobakina. "Dependence of the mean time to failure of a hydraulic balancing machine unit on different factors for sectional pumps of the Alrosa JSC." In MECHANICS, RESOURCE AND DIAGNOSTICS OF MATERIALS AND STRUCTURES (MRDMS-2017): Proceedings of the 11th International Conference on Mechanics, Resource and Diagnostics of Materials and Structures. Author(s), 2017. http://dx.doi.org/10.1063/1.5017391.

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Wognsen, Erik Ramsgaard, Rene Rydhof Hansen, Kim Guldstrand Larsen, and Peter Koch. "Energy-aware scheduling of FIR filter structures using a timed automata model." In 2016 IEEE 19th International Symposium on Design and Diagnostics of Electronic Circuits & Systems (DDECS). IEEE, 2016. http://dx.doi.org/10.1109/ddecs.2016.7482468.

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Baker, W. F., D. R. Horos, B. M. Johnson, and J. A. Schultz. "Timber Tower Research: Concrete Jointed Timber Frame." In Structures Congress 2014. Reston, VA: American Society of Civil Engineers, 2014. http://dx.doi.org/10.1061/9780784413357.113.

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Doyle, Derek, Andrei Zagrai, Brandon Arritt, and Hakan Cakan. "Damage Detection in Satellite Bolted Joints." In ASME 2008 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2008. http://dx.doi.org/10.1115/smasis2008-550.

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Abstract:
To overcome current limitations of satellite operation timelines, Operationally Responsive Space (ORS) satellites are being developed for rapid configuration and assembly. Time spent on flight qualification tests aimed at assembly verification and launch vehicle integration must be reduced to less than a week. Structural health monitoring (SHM) is seen as a possible avenue for real-time assessment of satellite integrity and qualification before launch. Embedded ultrasonics and magneto-mechanical impedance (MMI) were considered as potential candidates for diagnostics of critical system elements. Piezoelectric wafer active sensors in conjunction with an acousto-elastic SHM were used for assessment of aerospace structures with bolted joints. In the presented analysis, the acousto-elastic behavior of the joint was used as an indicator of structural integrity. Experimental results show changes in the nonlinear response of joints as a result of differing bolt torque. Localization potential of the acousto-elastic technique was demonstrated in a complex structure analogous to a typical satellite panel. The MMI method has shown utility in assessing condition of bolted joints in thin plates and a satellite structure. Experimental data reveal changes in magnitude and position of impedance peaks induced by the difference in structural loads applied to the joint. It is suggested that both the acousto-elastic and MMI methods have indicated possibilities for detecting and characterizing damage in satellite bolted joints.
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Perdok, Udo, Matt Crossman, Henk Jan Verhagen, Simon Howard, and Jonathan Simm. "Design of Timber Groynes." In Coastal Structures 2003. Reston, VA: American Society of Civil Engineers, 2004. http://dx.doi.org/10.1061/40733(147)79.

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Reports on the topic "Diagnostics of timber structures"

1

Sachse, Wolfgang. Synergistic Diagnostics of Aircraft Materials and Structures. Fort Belvoir, VA: Defense Technical Information Center, March 1998. http://dx.doi.org/10.21236/ada344202.

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Buchanan, Andrew, Birgit Ostman, and Andrea Frangi. White paper on fire resistance of timber structures. Gaithersburg, MD: National Institute of Standards and Technology, September 2014. http://dx.doi.org/10.6028/nist.gcr.15-985.

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Bunget, Gheorghe, Fritz Friedersdorf, and Jeon-Kwan Na. Quantitative Diagnostics of Multilayered Composite Structures with Ultrasonic Guided Waves. Fort Belvoir, VA: Defense Technical Information Center, September 2014. http://dx.doi.org/10.21236/ada615759.

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Wipf, Terry J., Michael A. Ritter, Sheila Rimal Duwadi, and Russell C. Moody. Development of a six-year research needs assessment for timber transportation structures. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, 1993. http://dx.doi.org/10.2737/fpl-gtr-74.

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Wipf, Terry, Brent M. Phares, and Micheal Ritter. Literature Review and Assessment of Nanotechnology for Sensing of Timber Transportation Structures Final Report. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, 2012. http://dx.doi.org/10.2737/fpl-gtr-210.

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Kuryliak, Dozyslav B. Development of Methods and Facilities for Radio-Wave UHF Diagnostics of Plane-layered Dielectric Structures. Fort Belvoir, VA: Defense Technical Information Center, February 2010. http://dx.doi.org/10.21236/ada530909.

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