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Procedures used to detect the condition of timber in historical structures
Kloiber, Michal
Within the scope of the lecture, methods of structural and technical surveys and their use were presented. The need for this kind of diagnostics, its significance for design projects, and various forms of survey outcomes were discussed, such as identification of tree species, identification of damage type, a detailed evaluation of moisture content in wood, identification of biological damage scope, and evaluation of damage degree.
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Analysis of traditional timber structures
Šigutová, Petra ; Vlk,, Zbyněk (referee) ; Zídek, Rostislav (advisor)
The subject of my bachelor´s thesis is the research of the statistical effect of a barn´s rafter. The preface is devoted to the creating two - dimensional models of the basic types of the rafters and their behavior during the loading. The main part of my thesis deals with the composing three-dimensional models of the roof. I try to depict the behavior of the structure after the deformation of the joints. I compare the results to the real behavior of the structure.
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Theatre House in Kuřim
Petr, Radovan ; Bajer, Miroslav (referee) ; Barnat, Jan (advisor)
The theme of the master´s theses is to design a wooden structure of city theater with internal steel construction. The concept of wooden structure is developed in two versions according to standard ČSN EN. The theses solve the static effect of the construction and design of individual parts and materials. Theater has dimensions 49.0 x 25.6 m, max. height of 12.5 meters. The construstion is devise to withstand a weight and applicability. The supporting structure of the roof is solved using by 13 arched plate girders. The second variant is designed as arched truss girders. The gable wall is glassed-in, glass envelopes support by wooden structure with columns and side runners. The work also includes solutions for joins and construction details. The structure was solved in the program RSTAB Dlubal 8. The assessment of the components was done using additional module TIMBER Pro. First Variant of plate girder was checking by manual report. The work includes drawings.
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Diagnostic methods for the evaluation of the state of a timber structure
Rusz, David ; Komárková, Tereza (referee) ; Heřmánková, Věra (advisor)
This thesis is focused on implementation and subsequent evaluation of selected diagnostic methods for a survey of timber structure. The first part of thesis describes wood structure and characteristics, the next part is about diagnostic methods followed by diagnostics of specific element of timber structures. The main aim of the thesis is to compare nondestructive, minor destructive and destructive methods for timber structures and their application in the practice.
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Study of static behaviour of selected agricultural objects
Horský, Vojtěch ; Zídek, Rostislav (referee) ; Brdečko, Luděk (advisor)
This thesis deals with the study of static behavior of agricultural buildings, evaluating their existing state using two-dimensional and three-dimensional construction models. Elements that serve to improve static effects of constructions are implemented into these models or replace the currently used elements. Strains of the modified constructions are calculated are applied to qualify the implemented elements and designed joints.
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Diagnostic methods for the evaluation of the state of a timber structure
Balas, Ondřej ; Anton, Ondřej (referee) ; Heřmánková, Věra (advisor)
This thesis is focused on the description and evaluation of selected diagnostic methods used for a survey of timber structures in the field. The first part of the thesis describes a structure and characteristics of wood; the other part provides a description of diagnostic methods followed by determination a level of injury and verification material characteristics of the particular element in the timber structure. The main aim of the thesis is to compare the diagnostic methods for the evaluation of the state of timber structures and verification of their application in practice.
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Modelling of traditional timber roof trusses
Vitásková, Petra ; Brdečko,, Luděk (referee) ; Zídek, Rostislav (advisor)
Bachelor’s thesis "Modelling of traditional timber roof trusses," analyzes the behavior of traditional timber roof trusses. Based on the actual design of roof trusses beam computational models are created, individual structural elements are assessed on the first and second limit state and some connections are considered. For the analysis of planar and three-dimensional model FEM programme SCIA Engineer 2011.1 is used.
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Measuring strength and modulus of deformability of wood in compression parallel to the grain in a bored hole by a small jack\n
Kloiber, Michal
The publication is dedicated to the methodical description of the technical solution and the measurement of strength and modulus of deformability of wood in compression parallel to the grain in a bored hole by pushing apart grips of a small jack and loading the walls of the hole. The methodology presents the principles of the device usage and measurement result evaluation for the purposes of surveys of historical monuments and projects for their rescue or appreciation. Currently, there is no other method allowing determination of mechanical properties of wood, such as strength and modulus of elasticity in compression parallel to the grain, directly in the field without sampling. Therefore, the research was oriented to the development of a simple method, practically applicable for the purpose of structural-technical surveys of timber structures, in particular historical monuments. The resulting methodology meets the protection of the cultural heritage standards, in particular the requirement to minimize interference with the original material, while retaining high reliability of the determined wood mechanical properties of wood.
Fulltext: content.csg -  PDF
Plný tet: 0453514_2015_Kloiber_Mereni_pevnosti_a_modulu_pretvarnosti_dreva_CM_NAKI-001 - PDF
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The numerical assessment of a full-scale truss reconstructed employing a traditional all-wooden joints
Milch, J. ; Tippner, J. ; Sebera, V. ; Kunecký, Jiří ; Kloiber, Michal ; Navrátil, M.
The assessment of mechanical behaviour of all-wooden joints used in historical timber structures such as churches, castles etc. is currently paid a big attention in the Czech Republic, and Central Europe as a whole. The reasons are (a) a high number of such structures; (b) their significance to the national cultural heritage and maintenance for preserving their cultural value; and (c) missing information about global mechanical behaviour of joints and whole truss structures when loaded. Generally, valuable historical monuments need to be evaluated as regards the structure and safety of all timber elements in the structure for their future preservation [1]. The present paper shows a novel methodology for virtual assessment of mechanical behaviour used in a historically valuable gothic truss structure of St. James's Church in Brno, which is very valuable from both structural and architectural points of view. The church was constructed between1220 and 1724, the used styles including the Romanesque, the Gothic and the Neogothic. Also carpentry master Anton Ebenberger participated [2]. The aim of this paper was to describe the real loading of a joint that corresponds to the real function of a joint in the truss structure during the loading owing to new positions of replacement joints in the truss. Currently, the truss of St. James’s church shows large defects including decayed members; therefore, renovation is needed. The restoration of the truss should be carefully implemented in the structure and analyzed beforehand. Therefore, the numerical approaches based on FEM were used to evaluate the mechanical behaviour of the beam truss with a detailed 3D solid joint.
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