A master thesis from Aalborg University
Computer Based FE Analysis of Reinforced Concrete Walls be the Stringer Method
[Computerbaseret FE analyse af armeret betonvægge ved stringermetoden]
Author(s)
Term
4. term
Education
Publication year
2012
Submitted on
2012-06-12
Pages
77 pages
Abstract
Optimering af konstruktioner for at opnå et økonomisk og bæredygtigt byggeri, er vigtige aspekter inden for byggesektoren. For at imødekomme denne efterspørgsel er programmet Opti_String udviklet med henblik på at optimere armeret betonvægge efter stringerteorien som er baseret på plasticitetsteori. Programmet er formuleret vha. FE koncept og Eurocodes er implementeret for at sikre praktiske design krav. En nedreværdi metode er sammenlignet med en øvreværdi. Sammenligningen viser at der eksistere en eksakt oversættelse for stringer systemet. Opti_String kan optimere en kompliceret konstruktion med vilkårlig geometri hvor optimeringen er baseret på en nedreværdi. Opti_String beregner den ultimative lastbæreevne eller designparametrene som knytter sig til en given med de tilhørende spændingsparametre. Ved anvendelsen af en kompliceret konstruktion er påvirkningen af praktiske design krav og flere lasttilfælde illustreret. Forskellige vægtningsparametre er anvendt for at fremtvinge en anden spændingerne i forsøget på at sænke udnyttelsesgraden for udvalgte elementer.
Optimisation of structures to reduce costs and environmental impacts are important issues in the building sector. In order to meet these the computer program Opti_String is developed for optimising reinforced concrete walls using the stringer method based on the plasticity theory. The program is formulated by a finite element concept. The Eurocode is implemented in Opti_String to ensure practical design demands. A lower bound method is compared with an upper bound method. The comparison shows that an exact translation for the stringer system exists. Opti_String is capable of optimising an ar- bitrary geometry and the optimisation is based on the lower bound method. Opti_String calculates the ultimate load bearing capacity or design parameters for a given load along with the stress parameters. By use of a complex structure the influence of practical design restrictions and several load cases are illustrated. Different weighting parame- ters are applied to force another stress distribution in order to decrease the utilisation of selected stringers.
Keywords
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