- GAČR No. 23-06016S “Surface treatment of glass and its influence on the reliability of adhesive bonding for glass structures at elevated temperatures”, 2023 – 2025
- GAČR No. 18-10907S „Mechanical characteristics of polymer adhesive joints in civil engineering applications considering environmental effects and ageing “, 2018-2020
- GAČR No. 14-17950S „Composite action between glass panes connected by polymer interlayer “, 2014 – 2016
- grant MŠMT v programu COST č. LD11037 „ Experimental and Numerical Analysis of Composite Glass Structures “, 2011 – 2013
- Research Fund for Coal and Steel EU, RFSR-CT-2007-00036 „Development of innovative steel-glass-structures in respect to structural and architectural design “ (INNOGLAST), 2008– 2010
- GAČR No. 103/05/0417 „ Enhanced reliability of glass structures “, 2005 – 2007
- grant MŠMT v programu COST č. 1P05OC067 „ Bolted connections of the glass load bearing elements “,2005
- grant MŠMT v programu KONTAKT č. RC_3_48 „Použití skla v nosných konstrukcích pozemního stavitelství“,2003-2005
GAČR No. 18-10907S „Mechanical characteristics of polymer adhesive joints in civil engineering applications considering environmental effects and ageing“ 2018-2020
- An effectiveness, load-bearing capacity and safety of adhesive joints are influenced by quality, integrity and durability of adhesive bonds between adhesive and substrate. Project „Mechanical characteristics of polymer adhesive joints in civil engineering applications considering environmental effects and ageing” was focused on assessment of environmental ageing resistance of two adhesives to various metal substrates often used in civil engineering with the objectives to contribute to understanding and quantification of the ageing process of the structural adhesive joints. The prediction of mechanical properties of a joint under exposure to a certain environment is a complicated task due to the mutual interaction of various degrading effects, such as temperature, UV-radiation, moisture.
Test set-up
Typical cycle of laboratory ageing
Stress-strain diagram for Silane Terminated Polymer and aluminum substrates
GAČR No. 14-17950S „Composite action between glass panes connected by polymer interlayer“ 2014 – 2016
Goal of the project “Composite action between glass panes connected by polymer interlayers” is to determine and verify shear transfer coefficient, which defines the ratio of composite action of laminated glass under different conditions including material ageing. Laminated glass is nowadays frequently used also for load bearing glass elements whose design is based on the ultimate states, i.e. on the verification of the stress. From this point of view, it is important to know the real stress redistribution in laminated glass plates which are connected by transparent polymeric foils. Material properties of interlayers are time and temperature dependent. It means that under high temperature laminated glass is without any composite action because polymer materials are not able to transfer shear forces, shear modulus will be close to zero. On the contrary, temperature under 20°C leads to the hardening of material and to the higher values of shear modulus. Second crucial factor influenced shear modulus is load duration because creeping of polymer interlayer can be observed under long term load. Safety design of such kind of glass panes doesn’t take into the account composite action except wind load. It leads to the conservative but uneconomical design. Obtained results of solved project significantly contribute to better design of load bearing structural glass elements.
Representative stress-strain curves for PVB interlayer Trosifol BG R20
Representative stress-strain curves for PVB interlayer Trosifol ExtraStrong
Research Fund for Coal and Steel EU, RFSR-CT-2007-00036 „Development of innovative steel-glass-structures in respect to structural and architectural design“ (INNOGLAST) 2008– 2010
Steel-glass constructions are increasing popular in modern architecture and the need for research in this field is significant. Both materials are architecturally synergistic materials in modern building design and are frequently used in facades, roofs, atria, canopies, walkways and other expressive forms of design. Hereby steel is a predictable, well researched material for structural applications, whereas glass is an elastic and brittle material without any capacity for plasticizing, less well researched for structural uses and not amenable to simplified design. The innovative approach here is using adhesive bonding to connect steel and glass elements for new, hybrid structures, which offer main advantages regarding load carrying capacity, stability behaviour, ductility and robustness. Thus the research project “Innovative Steel-glass-structures” (INNOGLAST) aims at the development of new and innovative steel-glass construction in respect to architectural, static-structural and fabrication criteria. For this two different examples are used:
1. Hybrid steel-glass beams
2. Steel-supported glass-systems
The development comprises the technical design of the details and investigations on the global and local static behaviour of such structures identifying the limits of the applications and find solutions for details like load introduction and connection points. For architects and engineers, the research present new steel-glass elements which fulfil architectural and technical needs regarding design, loading capacity, durability and robustness.
Set-up of the steel-glass connection tests (on the left: tension, on the right: shear)
Test set-up of the experiments