Parametric optimization of balanced cantilever bridge
Parametrická optimalizace letmo betonovaného mostu
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České vysoké učení technické v Praze
Czech Technical University in Prague
Czech Technical University in Prague
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Abstract
Práce se zabývá návrhem trámového mostu budovaného metodou letmé betonáže. Návrh je sestaven parametricky s hledáním optimálního tvaru nosné konstrukce. Rešerše rozebírá technologii letmé betonáže z hlediska návrhu geometrie a postupu výstavby. Empirické vztahy byly doplněny souhrnem mostů a osobní obhlídkou vybraných mostů letmé betonáže v České republice. Reologické vlastnosti betonu jsou definovány podle Eurokódu 2 pro betonové mosty. Do výpočtu je dotvarování zahrnuto funkcí poddajnosti a časově závislá analýza je provedena relaxační metodou. Parametrický model je rozdělen do čtyř dílčích. Příčný řez pro návrh mostovky a šířky komory, konzolový model zohledňující výstavbové stádium, model vahadla pro návrh pilířů a konečný model spojité konstrukce sdruženého rámu. Závěrem je výpočet aplikován na mostní konstrukci.
The thesis is focused on a design of girder bridge constructed using balanced cantilever method. The design is set up parametrically with search of optimal form of the superstructure. There are described technicalities of balanced cantilever method from perspective of geometry and construction process. Empirical parameters were supplemented by bridge summary and personal inspection of selected bridges constructed by balanced cantilever method in the Czech Republic. Rheological properties of concrete are defined by Eurocode 2 for concrete bridges. In calculation the creep is implied by compliance function and the time dependent analysis uses relaxation method. Parametrical model is separated into four ones. Cross-section for a model of a upper deck and a box width, cantilever model that represents construction stage, balanced cantilever model for design on piers and final model of continuous rigid frame. Finally the calculation is applied to a bridge structure.
The thesis is focused on a design of girder bridge constructed using balanced cantilever method. The design is set up parametrically with search of optimal form of the superstructure. There are described technicalities of balanced cantilever method from perspective of geometry and construction process. Empirical parameters were supplemented by bridge summary and personal inspection of selected bridges constructed by balanced cantilever method in the Czech Republic. Rheological properties of concrete are defined by Eurocode 2 for concrete bridges. In calculation the creep is implied by compliance function and the time dependent analysis uses relaxation method. Parametrical model is separated into four ones. Cross-section for a model of a upper deck and a box width, cantilever model that represents construction stage, balanced cantilever model for design on piers and final model of continuous rigid frame. Finally the calculation is applied to a bridge structure.