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Degradation of Tensile Load-Bearing Capacity of Molded Composite Reinforcement Due to Alkaline Environment
Lagiň, Juraj
The main reason for replacing the commonly used concrete reinforcement with composite reinforcement is its high resistance to aggressive environments. For direct reinforcement, this issue has been well described and investigated. In the case of shaped (bent) reinforcement, structural changes in the cross-section occur during the bending process, which can significantly affect its tensile capacity. The research work described in this paper was aimed at investigating changes in the tensile load-bearing capacity of bent glass fibre and epoxy matrix composite reinforcement. The reinforcement was placed in three types of baths, which simulates different environments or reinforcement ages. The paper describes the comparison of straight and bent reinforcement, comparison of calculation relationship, methods of reinforcement failure and variables affecting the resulting tensile load-bearing capacity of reinforcement. The research results confirm the high resistance of (straight) reinforcement to aggressive environments. A reduction in tensile strength was observed for the shaped (bent) reinforcement. The reduction rate for the most exposed specimen exceeded up to 33%, indicating that the calculation relationship according to the Japanese JSCE cannot be used to calculate the tensile load-bearing capacity of composite reinforcement exposed in aggressive alkaline environments.
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Application of FRP reinforcement in the design of concrete structures
Kratochvílová, Barbora ; Lagiň, Juraj (referee) ; Girgle, František (advisor)
This bachelor thesis deals with two types of reinforcement FRP reinforcement and generally used steel reinforcement. The first part of this thesis is focused on theoretical knowledge related to FRP reinforcement. There is described its composition, properties, production, durability and its design properties from a theoretical point of view. In the following part, the design and assessment of a specific prefabricated U part is performed. The design and assessment is performed in two variants from FRP reinforcement and steel reinforcement.
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Design of selected details of concrete structures with embedded FRP reinforcement
Lagiň, Juraj ; Matušíková, Anna (referee) ; Girgle, František (advisor)
The diploma thesis is devided into two levels. The Primary part of the thesis is the theoretical part, which is part of project „FV10588 – New generation of spatial prefab made from high-firm concrete with increased mechanical resistence and endurance“, realized in cooperation with Faculty of Civil Engineering at VUT university – Institute of concrete and masonry structures. The project deals with frame corners in the form of steel and composite reinforcement which will compared through experiments and various kind of calculate proceedings. The secondary part of thesis focuses on the static-design project of cooling reservoir, placed under the ground, while is stressed by temperature. The reinforcement of the construction is realized in two ways – steel and composite reinforcement with their effectivity compared.
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Reinforced concrete structure of office building
Lagiň, Juraj ; Šulák, Pavel (referee) ; Girgle, František (advisor)
The Bachelor thesis deals with structural solution and comparing of the two variants of reinforced concrete slab structure of administrative building. First variant, designed like a slab with full section, is being compared with a variant of slab, which is designed like a voided slab by formwork U-boot. The structure is designed and assessed for ultimate limit state in accordance with ČSN EN 1992-1-1: Design of concrete structures – Part 1-1: General rules and rules for building.
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