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Design of prestressed box gireder bridge
Hofírek, Radovan ; Jurík, Michal (referee) ; Zich, Miloš (advisor)
This thesis deals with bridging of a lowland valley and the creek Dolanský in the section Jánovce – Jablonov on the Slovak motorway D1. Four variants of the bridge have been developed. Subsequently prestressed single box gilder with large overhangs that are supported by precast struts was selected as the most suitable variant. The construction of the bridge will take place in a formwork suspended on overhead launching scaffolding. The static assessment according to the Europan standard has been drawn up for this variant. The load of the bridge is projected according to the ČSN EN 1991-2 - Traffic loads on bridges and the dimensoin of concrete structures according to the ČSN EN 1992-2 - Concrete bridges - Design and detailing rules. The calculation of load is done using computer software SCIA Engineer 10.1 and Midas Civil.
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CONSTRUCTION-TECHNOLOGY PROJECT OF BRIDGE DEMOLITION AND BRIDGE CONSTRUCTION
Hofírek, Radovan ; Venkrbec, Václav (referee) ; Henková, Svatava (advisor)
This diploma thesis deals with the demolition of a bridge located at the D1 motorway from Prague to Brno. The bridge no longer meets the load and width requirements of today´s standards. The thesis also deals with the construction of a new bridge, which will be expanded into D28/120 category. This expansion will allow for provisory use of the carriageways of one half of the motorway in both directions. The whole reconstruction is very time consuming that is the reason the new bridge is made of prefabricated pre-tensioned girders with a composite bridge deck. This can save time and the new bridge can be open for service in a shorter period of time.
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Prestressed concrete Bridges
Filip, Štěpán ; Hofírek, Radovan (referee) ; Panáček, Josef (advisor)
The aim of this Bachelor thesis is the design of perpendicular bridge over no name (local) brook without permanent flow. Its content is the design of the structure of the one-span bridge, which is designed in three variants. The selected option consists of additionally prestressed slab of height 1,0 m with a length of 24,3 m. Calculation of load effects is done by computer software SCIA ESA 2013 . Evaluation of structure is calculated manually according to standard EN 1992-2. The calculation is done without time analysis.
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Slab bridge in Velké Pavlovice
Gřunděl, Michal ; Hofírek, Radovan (referee) ; Koláček, Jan (advisor)
Bachelor thesis deals with the design of the new bridge according to EN 1992-1-1. The bridge is used to convert local road across the river Trmánka. The bridge is designed as a plate with a full cross-section of the trapezium, a statically resolved as a bridge is just stored with the length of bridge 12, 1 m. Categories of communication is S 7.5. Encumbered and assessment on the MSÚ and MSP is resolved according to the standards.
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The effective cross-section thickness and its effect on the behavior of concrete constructions
Hofírek, Radovan ; prof. ing. Jan L. Vítek, CSc. (referee) ; Borzovič,, Viktor (referee) ; Zich, Miloš (advisor)
Determination of rheological phenomenon is very difficult, because there are many unknown inputs parameters, e.g. concrete age, the size of elements, relative humidity of the surrounding environment, cement hydration rate, temperature influence, type of strain and treatment. This Ph.D. thesis deals with the effective cross-section thickness and its effect on the behaviour of concrete constructions that is how the rheological phenomena change in time as a result of the application or removal of insulation layer from the concrete surface. Long-term experimental measurements of specimens and real bridge constructions were performed. The data collected from these measurements were described, evaluated and mathematical modifications for the standards Model Code 2010 and Model B4 (B3) have been proposed. Using these new computational formulas is possible to take into consideration the changes in the effective cross-section thickness and therefore make the computational models for concrete structures more accurate.
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The effective cross-section thickness and its effect on the behavior of concrete constructions
Hofírek, Radovan ; prof. ing. Jan L. Vítek, CSc. (referee) ; Borzovič,, Viktor (referee) ; Zich, Miloš (advisor)
Determination of rheological phenomenon is very difficult, because there are many unknown inputs parameters, e.g. concrete age, the size of elements, relative humidity of the surrounding environment, cement hydration rate, temperature influence, type of strain and treatment. This Ph.D. thesis deals with the effective cross-section thickness and its effect on the behaviour of concrete constructions that is how the rheological phenomena change in time as a result of the application or removal of insulation layer from the concrete surface. Long-term experimental measurements of specimens and real bridge constructions were performed. The data collected from these measurements were described, evaluated and mathematical modifications for the standards Model Code 2010 and Model B4 (B3) have been proposed. Using these new computational formulas is possible to take into consideration the changes in the effective cross-section thickness and therefore make the computational models for concrete structures more accurate.
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|
CONSTRUCTION-TECHNOLOGY PROJECT OF BRIDGE DEMOLITION AND BRIDGE CONSTRUCTION
Hofírek, Radovan ; Venkrbec, Václav (referee) ; Henková, Svatava (advisor)
This diploma thesis deals with the demolition of a bridge located at the D1 motorway from Prague to Brno. The bridge no longer meets the load and width requirements of today´s standards. The thesis also deals with the construction of a new bridge, which will be expanded into D28/120 category. This expansion will allow for provisory use of the carriageways of one half of the motorway in both directions. The whole reconstruction is very time consuming that is the reason the new bridge is made of prefabricated pre-tensioned girders with a composite bridge deck. This can save time and the new bridge can be open for service in a shorter period of time.
|
|
|
Design of prestressed box gireder bridge
Hofírek, Radovan ; Jurík, Michal (referee) ; Zich, Miloš (advisor)
This thesis deals with bridging of a lowland valley and the creek Dolanský in the section Jánovce – Jablonov on the Slovak motorway D1. Four variants of the bridge have been developed. Subsequently prestressed single box gilder with large overhangs that are supported by precast struts was selected as the most suitable variant. The construction of the bridge will take place in a formwork suspended on overhead launching scaffolding. The static assessment according to the Europan standard has been drawn up for this variant. The load of the bridge is projected according to the ČSN EN 1991-2 - Traffic loads on bridges and the dimensoin of concrete structures according to the ČSN EN 1992-2 - Concrete bridges - Design and detailing rules. The calculation of load is done using computer software SCIA Engineer 10.1 and Midas Civil.
|
|
|
Prestressed concrete Bridges
Filip, Štěpán ; Hofírek, Radovan (referee) ; Panáček, Josef (advisor)
The aim of this Bachelor thesis is the design of perpendicular bridge over no name (local) brook without permanent flow. Its content is the design of the structure of the one-span bridge, which is designed in three variants. The selected option consists of additionally prestressed slab of height 1,0 m with a length of 24,3 m. Calculation of load effects is done by computer software SCIA ESA 2013 . Evaluation of structure is calculated manually according to standard EN 1992-2. The calculation is done without time analysis.
|
|
|
Slab bridge in Velké Pavlovice
Gřunděl, Michal ; Hofírek, Radovan (referee) ; Koláček, Jan (advisor)
Bachelor thesis deals with the design of the new bridge according to EN 1992-1-1. The bridge is used to convert local road across the river Trmánka. The bridge is designed as a plate with a full cross-section of the trapezium, a statically resolved as a bridge is just stored with the length of bridge 12, 1 m. Categories of communication is S 7.5. Encumbered and assessment on the MSÚ and MSP is resolved according to the standards.
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