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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

Análise estrutural de edifícios de paredes de concreto com a incorporação da interação solo-estrutura e das ações evolutivas / Structural analysis of concrete wall buildings including soil-structure interaction and progressive loading

Rômulo da Silva Farias 06 December 2018 (has links)
As análises estruturais têm como procedimento usual considerar apoios rígidos nas fundações e aplicar as ações de maneira instantânea. Essas duas simplificações podem induzir a uma configuração de esforços não condizentes com a estrutura real. Este trabalho investiga a interação solo-estrutura (ISE) em edifícios de paredes de concreto apoiados em fundação do tipo radier. O presente estudo considera a sequência construtiva da edificação, denominada por ações evolutivas, objetivando obter resultados mais condizentes com a estrutura real. A investigação é realizada mediante simulação numérica utilizando o Método dos Elementos Finitos (MEF) por meio do pacote computacional DIANA®. A tipologia do modelo numérico é baseada em um conjunto de edifícios já construídos. São utilizados dados de monitoramento de recalques geotécnicos ao longo da construção dos edifícios para aferir as propriedades constitutivas do solo no modelo numérico. São analisados os efeitos da deformação da fundação na redistribuição de esforços e tensões das paredes da superestrutura, a contribuição da rigidez da estrutura na uniformização dos recalques e demais parâmetros que envolvem a ISE na estrutura e na fundação. A NBR-16055 (ABNT, 2012) obriga que seja incorporado a interação solo-estrutura nas análises de edifícios de paredes de concreto acima de 5 pavimentos. O presente estudo indica que os efeitos da ISE na estrutura têm uma maior dependência da rigidez relativa estrutura-solo. Deste modo, é proposto um coeficiente específico de rigidez relativa estrutura-solo para edifícios de paredes de concreto. São realizados estudos paramétricos que indicam que o coeficiente proposto pode ser utilizado como um parâmetro para análise da ISE em edifícios de paredes de concreto. / The usual procedure in structural analysis neglects the deformation of the foundations and the load sequence of the building. These simplifications can provide inaccurate results. This work deals with the structural analysis of concrete wall buildings settled on raft foundations taking into account the soil-structure interaction (SSI) and the progressive vertical loading. The numerical simulation was performed using the finite element method (FEM) in the DIANA® software. The numerical model is based on a set of buildings already constructed. During the construction process, the settlement of many points were measured and are used here to evaluate the constitutive soil parameters to feed the numerical models. The obtained results show a redistribution of the walls internal forces and the loss of uniformity of their vertical normal stress. The progressive vertical loading during the construction reduces the influences of the soil-structure interaction. The Brazilian code for concrete wall buildings (NBR-16055, 2012) requires that the soil/structure interaction be incorporated into the structural model in the buildings with more than 5 stories. A specific relative stiffness structural-soil factor is proposed for concrete wall buildings. The present study indicates that the SSI results are not related to the number of floors of the building. The SII have a larger dependence on soil stiffness and relative stiffness structure-soil.
22

Slöseri i produktionsflödet: Analys av en platsgjuten betongvägg / Waste in the production flow: Analysis of a cast in-situ concrete wall

Fransson, Mattias, Jamtlien, Mattias January 2018 (has links)
Höga byggkostnader och betydande bostadsbrist i Sverige visar att ett effektivare bostadsbyggande krävs. En reducering av slöseri i byggprocessen bidrar till en effektivisering av både tid och kostnad. För att öka förståelsen för vikten av effektivisering synliggör den här studien slöseri i produktionsflödet för en platsgjuten betongvägg i ett bostadsprojekt. Studien visar även var i produktionsflödet det finns förbättringsmöjligheter. Slöseriet synliggjordes genom en tidsstudie som visade på stor potential till förbättring i bostadsprojektets resursflöde, materialflöde och informationsflöde. Mycket tyder på att dessa brister i produktionsflödet beror på allt för kort byggtid, vilket leder till att en fullgod planering inte alltid utförs. / High construction costs and considerable housing shortages in Sweden show that a more efficient housing construction is required. A reduction of waste in the construction process contributes to the efficiency of both time and cost. In order to increase the understanding of the importance of efficiency, this study reveals waste in the production flow of a cast in-situ concrete wall in a housing project. The study also shows where in the production flow there are improvement opportunities. The waste was made visible through a time study which showed great potential for improvement in the housing project resource flow, material flow and information flow. There are many indications that these shortcomings in the production flow are due to a too short construction time, which means that a good planning is not always carried out.
23

Contribution à la modélisation par éléments finis des structures en béton armé soumises à des avalanches de neige : Application à la structure de protection de Taconnaz / Contribution to the finite element modelling of reinforced concrete structures subjected to snow avalanches : Application to the protective structure of Taconnaz

Ousset, Isabelle 15 June 2015 (has links)
En zone de montagne, les avalanches de neige menacent les personnes et également les structures de génie civil. Ce travail de thèse se focalise sur une structure de protection en BA (Béton Armé) de type mur en L. L'objectif est de caler et valider un modèle EF (Elément Fini) 2D afin d'étudier le comportement de tels ouvrages sous l'effet de champs de pression induits par des avalanches de neige dense et d'évaluer leur vulnérabilité face à cet aléa naturel. Quatre lois de comportement décrivant la rhéologie du béton ont été testées en vue de reproduire le plus précisément possible la ruine du mur en BA. Un modèle physique de la structure à échelle 1/6 a permis, via un test pushover, d'obtenir des données expérimentales utiles pour le calage des modèles EF proposés. Seulement deux des lois de comportement ont permis de converger vers un mode de ruine pertinent et en accord avec les observations expérimentales. Le modèle EF une fois calé a ensuite été utilisé afin d'investiguer la réponse mécanique de l'ouvrage sous sollicitation avalancheuse. En fonction de l'impulsion du signal de chargement, trois régimes peuvent être obtenus (quasi-statique, dynamique et impulsionnel). Dans le cas d'une avalanche de neige dense, les résultats montrent que la réponse mécanique de la structure en question peut être considérée comme quasi-statique. Toutefois, les signaux avalancheux dépendant de nombreux facteurs (type d'avalanche, densité, température, etc.), différents types de réponses peuvent potentiellement se développer. Pour finir, la vulnérabilité et la fiabilité du mur en BA ont été étudiées afin de préciser l'influence d'une part de la géométrie et d'autre part des caractéristiques des matériaux sur la capacité de protection qu'offre ce type d'ouvrage. In fine, ces résultats pourront être utilisés dans un cadre de gestion intégrée du risque. / Snow avalanches threaten people and also different types of civil engineering structures in mountainous areas. This PhD thesis focuses on a protective RC (Reinforced Concrete) structure consisting of an L-shaped wall. The objective of this study is to calibrate and validate a 2D FE (Finite Element) model in order to explore the mechanical behavior of such RC structures loaded by snow avalanche pressure fields and to assess their vulnerability when exposed to this kind of natural hazard. Four constitutive laws describing the concrete rheology were tested to describe the collapse of the RC wall. A physical 1/6-scale model permitted obtaining, via a pushover test, useful experimental data for the calibration of the proposed FE models. Two concrete models allowed converging to a relevant collapse of the structure in agreement with the experimental observations. Then, the calibrated FE model was used to investigate the mechanical response of the wall under avalanche loading. According to the impulse of the loading signal, three regimes can occur (quasi-static, dynamic or impulsive). In the case of dense-snow avalanches, the results show that the mechanical response of this structure can be described as quasi-static. However, avalanche signals depend on many factors (type of avalanche, density, temperature, etc.) and several types of responses can potentially develop. Finally, the vulnerability and the reliability of the RC wall were studied to show the influence of the geometry and the material properties on the capacity of the protective structure. In fine, these results will be used in an integrated risk framework in order to help decision makers.
24

Sportovní centrum / Sports Centre

Hentschelová, Tereza January 2020 (has links)
The goal of this thesis is to elaborate project documentation of new sports centre. The building is situated on a plot No. 1930/48 of the cadastre territory in the town of Pacov. It is a building without cellar with two above-ground floors part on the area of 595,6 m2. The first floor part circuit structure consist of reinforced concrete walls with an outdoor climbing wall. The roofing is the mono-pitches roof with glue laminated timber beam and purlin with metal roofing. The building features an indoor climbing wall and a bar with seating. The second floor part is made of wooden CLT panels, the roof is designed as a green flat roof. This section provides facilities for athletes and staff and exercise halls. There are 50 parking spaces for cars in the building.
25

Posouzení železobetonové konstrukce bytového domu / The Design of RC Structure of Residential House

Hrvolová, Markéta January 2016 (has links)
The aim of the diploma thesis is static solution of selected parts of the residental house with formwork drawings and reinforcement drawings of designed structures included. Project describes the design and assessment of the monolitic slab structure, precast stair flights, basement loadbearing wall and retaining wall. For calculation of the internal forces was used software Scia Engineer.
26

Sportovní centrum v Bílovicích nad Svitavou / Sport Centre in Bilovice nad Svitavou

Šmak, Michal January 2017 (has links)
The thesis contains a draft of new sport centre on the outskirts of the village Bílovice nad Svitavou. As part of the squash hall with four courts and the adjacent center, which consists of other sports, cafe, facilities for employees and staff and other technical rooms. The exterior of the object contains playground, pétanque area, a terrace cafe with adjacent playground and parking area. Primarily a center designed for practicing sports and physical activities, which serve the mentioned sports and sports facilities. Furthermore, the building is used as a cafe with adjoining outdoor terrace. The entire building is wheelchair accessible, including the 2nd floor, where is a lift. The thesis project is elaborated sports center in Bílovice nad Svitavou. We have been further processed two specializations - design and assessment of reinforced concrete perimeter wall and design of air-conditioning units and air-conditioning pipe sizing in sports areas. It is part seminary work dealing with the principles of organization of construction, the technical report of site facilities and the actual drawing of the site facilities.
27

Statické řešení bytového domu / Static analysis of an apartment building

Brázdil, Jakub January 2022 (has links)
Diploma thesis deals with the design and static analysis of an apartment building. The main task of thesis is to design and access the constructions of an expension of an apartment building. The assesment is carried out according to the ČSN EN 1992-1-1.
28

Krytý městský bazén - betonová konstrukce nádrže / Indoor swimming pool - concrete tank construction

Pőthe, Péter January 2019 (has links)
The aim of the diploma thesis was to design reinforced concrete construction of the indoor swimming pool and ensure impermeability of the construction, to ensure behavior as concrete tank construction. Static analysis was done by using program Dlubal RFEM 5.12, where interaction of subsoil with construction was taken into account. Slabs around the swimming pool area were divided into expansion section because of temperature changes from glass façade an after that the sealing of expansion gap was solved. Construction system under the swimming was designed and was tested the behavior of walls and slabs. Analysis was done also to considerate of hydration heat. The drawing was done by software CADKON RCD.
29

Polyfunkční dům, ulice Přístavní, Praha 7 / The building, Přístavní street, Praha 7

Degr, Luboš January 2015 (has links)
The subject of this Diploma Thesis is newly built polyfunctional building in the Prague – Holešovice. Building land is slightly sloping. The building will be followed by the surrounding buildings. The building consists of seven floors. The floor underground technical spaces and collective garages. On the ground floor are two commercial spaces and reception. In the second to fifth floor are office space. The top floor is a penthouse with terraces. The building is designed as a monolithic reinforced concrete skeleton accompanied by a facade wall and the wall forming the core. The core consists of a elevator and a staircase. Floor slabs is continuous reinforced concrete slab with capitals. The façade of the building is divided by pilasters, stone cladding. Root at the penthouse is composed of a terrace with vegetation. Ground floor consists of shop windows with sun screens. All designs are in accordance to the valid ČSN code.

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