| Description |
1 online resource (155 p.) |
| Series |
Mechanik, Werkstoffe und Konstruktion Im Bauwesen ; v.70 |
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Mechanik, Werkstoffe und Konstruktion im Bauwesen ; v. 70.
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| Contents |
Intro -- Danksagung -- Abstract -- Zusammenfassung -- Contents -- Glossaries -- Abbreviations -- Symbols -- 1 Introduction -- 1.1 Motivation -- 1.2 State of the Art -- Optical Anisotropy in tempered Architecture Glass -- Photoelastic Full-Field Methods -- Evaluation Methods and Quality Assessment -- 1.3 Structure -- 1.4 Achievements of this Work -- 1.5 List of own Publications on this Ph.D. Thesis -- 2 Theoretical Principles -- 2.1 Basics of Linear Elasticity -- 2.2 Nature of Polarized Light -- 2.2.1 Nature of Light -- 2.2.2 Types of Polarized Light -- 2.2.3 Stokes Parameters |
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2.3 Polarization of Light -- 2.3.1 General -- 2.3.2 Polarization by Scattering -- 2.3.3 Polarization by Reflection -- 2.4 Brewster's Angle -- 2.5 Passage of Light through Media -- 2.6 Basics of Photoelasticity -- 2.6.1 General -- 2.6.2 Artificial Birefringence -- 2.6.3 Stress-Optical Law -- 2.6.4 Plane and Circular Polariscope -- 3 Glass and their Photoelastic Behaviour -- 3.1 General -- 3.2 Residual Stresses -- 3.3 Photoelastic Behaviour -- 3.4 Visual Perception of Anisotropy Effects -- 4 Photoelastic Methods for Measuring Anisotropy Effects -- 4.1 General -- 4.2 Scattered Light Method |
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4.3 RGB Photoelasticity -- 4.4 Half-Wavelength and Multi-Wavelength Photoelasticity -- 4.5 Phase-Shifting Methods -- 4.6 PSM for Skylight Observation -- 5 Photoelastic Measurements on Tempered Flat Glass -- 5.1 Validation Experiments -- 5.1.1 Accuracy and Precision -- 5.1.2 Temperature Dependency -- 5.2 Specimen -- 5.3 Influence from Geometry Parameters -- 5.3.1 Thickness -- 5.3.2 Size -- 5.3.3 Holes and Cut Outs -- 5.4 Influence from Glass-Specific Parameters -- 5.4.1 Type of Glass -- 5.4.2 Tempering Level -- 5.5 Influence from Furnace Parameter -- 5.5.1 Glass Position -- 5.5.2 Glass Orientation |
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6 Experimental Field Studies on Tempered Flat Glass -- 6.1 Design and Construction the Test Facility -- 6.2 Setup and Specimen -- 6.3 Influence from the Building Environment and Use -- 6.3.1 Background Lighting -- 6.3.2 Reflection Disturbances -- 6.4 Influence from Viewing -- 6.4.1 Viewing Angle -- 6.4.2 Viewing Position -- 6.4.3 Viewing Direction and Sun Position -- 6.5 Influence from Skylight Polarization -- 6.6 Visual Intensity of Anisotropy Effects -- 6.7 Correlation between Measurement and Observation -- 7 Methods for evaluating Anisotropy Effects in Glass -- 7.1 Evaluation Zone |
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7.2 Statistical Method Quantile Value -- 7.3 Threshold Method Isotropy value -- 7.4 Texture Analysis -- 7.5 Method and Combined Textural Feature CCP -- 8 Evaluation and Concept -- 8.1 Assessment of Evaluation Methods -- Iso75 -- x95 -- CCP -- 8.2 Anisotropy Quality of Tempered Flat Glass -- 8.3 Evaluation Concept -- 8.3.1 General -- 8.3.2 Definition of the Quality Classes -- 8.3.3 Requirements for the Measurement -- 8.3.4 Procedure of the Evaluation Concept -- 8.4 Discussion -- 9 Summary and further Research -- Further Research -- References -- Own Publications -- Standards -- Bibliography |
| Summary |
Optical anisotropy eects can occur in building envelopes made of tempered glass. The visual eect has been neglected in the evaluation of the building product and increasingly leads to disputes between the parties involved. This thesis extends the state of knowledge on the cause and perception of optical anisotropic eects and presents a concept for measuring and evaluating them in at monolithic tempered architectural glass. Initially, an overview and description of current photoelastic measurement methods are given, and the accuracy of the used measurement setups is veried for the rst time. The experimental basis for the concept is formed by extensive full-eld retardation measurements in the laboratory and eld studies of the maximum visibility of the anisotropy eects in an outdoor test rig with accompanying polarization measurements of the sky. Various glass types, geometries, and tempering levels are selected based on typically used products, and their inuence on the resulting retardation image is investigated. Determining a correlation of the retardation images with the reection images of selected test specimens in the outdoor test rig complements the experiments. Based on this, digital evaluation methods are presented, further developed, and applied to the measured retardation images. From the critical analysis of these results, limit values for dierent anisotropy quality classes are derived, and the concept is complemented. With the implementation of the evaluation methods and the limit values in commercial anisotropy scanners, the quality of each glass pane can be determined directly after tempering in the future. By choosing the highest quality class A, it will be possible to signicantly reduce anisotropy eects in constructions made of tempered glass panes. The Author Steffen Dix, began his career at seele GmbH in 2003 as a technical draftsman apprentice. In 2015, he received a Master's degree in civil engineering with a focus on steel, lightweight, and glass construction from the University of Applied Sciences in Munich. During his studies from 2009 to 2015, he worked in the Labor fr Stahl- und Leichtmetallbau, starting as a working student and later as a Research Assistant. His research focused on adhesives in faade design and the strength and quality of pre-stressed glass products, culminating in his dissertation on the measurement and evaluation of optical anisotropy effects in tempered architectural glass. From 2016 to 2022, he also worked as a freelance expert in glass and faade construction for the Ingenieurbro fr Bautechnik Schuler in Karlsruhe. Since 2022, the author is working as Technical Solution Manager at Josef Gartner GmbH (Permasteelisa), where he develops individual and innovative faade constructions |
| Notes |
Description based upon print version of record |
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Appendix A Experiments Results |
| Bibliography |
Includes bibliographical references |
| Notes |
Online resource; title from PDF title page (SpringerLink, viewed October 12, 2023) |
| Subject |
Anisotropy.
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Architectural glass.
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anisotropy.
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architectural glass.
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Anisotropy
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Architectural glass
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| Form |
Electronic book
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| ISBN |
9783658420291 |
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3658420294 |
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