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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.
111

Parametric optimization of reinforced concrete slabs subjected to punching shear

Thuresson, Sofia January 2020 (has links)
The construction industry is currently developing and evolving towards more automated and optimized processes in the project design phase. One reason for this development is that computational power is becoming a more precise and accessible tool and its applications are multiplying daily. Complex structural engineering problems are typically time-consuming with large scale calculations, resulting in a limited number of evaluated solutions. Quality solutions are based on engineering experience, assumptions and previous knowledge of the subject.The use of parametric design within a structural design problem is a way of coping with complex solutions. Its methodology strips down each problem to basic solvable parameters, allowing the structure to be controlled and recombined to achieve an optimal solution.This thesis introduces the concept of parametric design and optimization in structural engineering practice, explaining how the software application works and presenting a case study carried out to evaluate the result. In this thesis a parametric model was built using the Dynamo software to handle a design process involving a common structural engineering problem. The structural problem investigated is a reinforced concrete slab supported by a centre column that is exposed to punching shear failure. The results provided are used for comparisons and as indicators of whether a more effective and better design has been achieved. Such indicators included less materials and therefore less financial cost and/or fewer environmental impacts, while maintaining the structural strength. A parametric model allows the user to easily modify and adapt any type of structure modification, making it the perfect tool to apply to an optimization process.The purpose of this thesis was to find a more effective way to solve a complex problem and to increase the number of solutions and evaluations of the problem compared to a more conventional method. The focus was to develop a parametric model of a reinforced concrete slab subjected to punching shear, which would be able to implement optimization in terms of time spent on the project and therefore also the cost of the structure and environmental impact.The result of this case study suggests a great potential for cost savings. The created parametric model proved in its current state to be a useful and helpful tool for the designer of reinforced concrete slab subjected to punching shear. The result showed several solutions that meet both the economical and the punching shear failure goals and which were optimized using the parametrical model. Many solutions were provided and evaluated beyond what could have been done in a project using a conventional method. For a structure of this type, a parametric strategy will help the engineer to achieve more optimal solutions. / Just nu utvecklas Byggbranschen mot mer automatiserade och optimerade processer i projektdesignfasen. Denna utveckling beror till stor del på teknikutveckling i form av bättre datorprogram och tillgänglighet för dessa. Traditionellt sett löses komplexa konstruktionsproblem med hjälp av tidskrävande och storskaliga beräkningar, vilka sedan resulterar i ett begränsat antal utvärderade lösningar. Kvalitets lösningar bygger då på teknisk erfarenhet, antaganden och tidigare kunskaper inom ämnet.Användning av parametrisk design inom ett konstruktionsproblem är ett sätt att hantera komplexa lösningar. Dess metod avgränsar varje problem ner till ett antal lösbara parametrar, vilket gör att strukturen kan kontrolleras och rekombineras för att uppnå en optimal lösning.Denna avhandling introducerar begreppet parametrisk design och optimering i konstruktionsteknik, den förklarar hur programvaran fungerar och presenterar en fallstudie som genomförts för att utvärdera resultatet. I denna avhandling byggdes en parametrisk modell med hjälp av programvaran Dynamo för att hantera en designprocess av ett vanligt konstruktionsproblem. Det strukturella problemet som undersökts är en armerad betongplatta som stöds av en mittpelare, utsatt för genomstansning. Resultaten används för att utvärdera om en bättre design med avseende på materialanvändning har uppnåtts. Minimering av materialanvändning anses vara en bra parameter att undersöka eftersom det ger lägre kostnader och/eller lägre miljöpåverkan, detta undersöks under förutsättning att konstruktionens hållfasthet bibehålls. En parametrisk modell gör det möjligt för användaren att enkelt modifiera en konstruktionslösning med avseende på olika parametrar. Detta gör det till det perfekta verktyget att tillämpa en optimeringsprocess på.Syftet med denna avhandling var att hitta ett mer effektivt sätt att lösa ett komplext problem och att multiplicera antalet lösningar och utvärderingar av problemet jämfört med en mer konventionell metod. Fokus var att utveckla en parametrisk modell av en armerad betongplatta utsatt för genomstansning, som kommer att kunna genomföra optimering med avseende på tid som spenderas på projektet och därmed också kostnaden för konstruktionen och miljöpåverkan.Resultatet av denna fallstudie tyder på att det finns en stor möjlighet till kostnadsbesparingar och anses därför vara ett mycket hjälpsamt verktyg för en konstruktör. Resultatet visade flera lösningar som uppfyllde de konstruktionsmässiga kraven samtidigt som de gav en lägre materialanvändning tack vare optimeringen. Många lösningar tillhandahölls och utvärderades utöver vad som kunde ha gjorts i ett projekt med en konventionell metod. En parametrisk strategi kommer att hjälpa ingenjören att optimera lösningen för en konstruktion av denna typ.
112

Vícepatrová skeletová konstrukce administrativní budovy / Reinforced concrete frame structure of multi-storey administrative building

Zdražilová, Pavlína January 2018 (has links)
This diploma thesis deals with design and assessment of selected parts of the reinforced concrete frame of multi-storey administrative building according to the ultimate and serviceability limit state. The aim of this thesis was to design and assess the reinforced concrete structure of a slab above the first floor, one column, a foundation pad and a staircase. In addition to the static calculation, drawing documentation is included. Internal forces were obtained from the 3D model created in computational software Scia Engineer 16.1.
113

Zesílení železobetonové konstrukce pro ocelovou nástavbu / The strengthening of the reinforced concrete structure for the steel superstructure

Tůma, Pavel January 2018 (has links)
This diploma thesis analyze reinforced concrete construction, which is loaded by new steel superstructure with brick cladding. The necessary strengthening of construction is solved by using carbon fibre reinforced polymer plates. Software RFEM 5 is used for calculation of internal forces. All checks are made in Excel.
114

Využití moderních kompozitních materiálů při návrhu betonových konstrukcí / The use of advanced composite materials for the design of concrete structures

Macháček, Jan January 2019 (has links)
The diploma thesis deals with the design of concrete structures reinforced by FRP according to ACI, fib, CSA and EC2 regulations, which are stressed by a shear force. The diferences between steel rebar and FRP reinforcement were described, in particular its mechanical degradation over time and a different stress-strain diagram. Furthermore, shear capacity calculations were performed according to the regulations and compared with the real tests. Then the parametric analysis of shear strength was performed. In the practical part, the design of concrete floor slab structure supported by the pillars and walls was performed. The upper reinforcement of this slab was designed with FRP and the lower with steel rebar. Double-headed studs were used as a punching shear reinforcement.
115

Polyfunkční dům / Multifunctional Building

Erlebach, Jakub January 2019 (has links)
The diploma thesis concerns static project of chosen parts of load-bearing structure four-storey multifunctional building. It´s frame structural systém locally supported colomns. The thesis suggests floor slab above ground floor including punching, colomn, foundation pad, basement wall, loaded soil and strip foundation. Every element was judged by load-bearing capacity, designed reinforcement and made drawings of reinforcement. Calculation of internal forces is made by finite element method of the program dlubal RFEM.
116

Využití moderních kompozitních materiálů při návrhu betonových konstrukcí / The use of advanced composite materials for the design of concrete structures

Bártová, Denisa January 2020 (has links)
This diploma thesis deals with the design of FRP reinforced concrete structures. The theoretical part is focused mainly on the punching shear of a flat two way slab according to ACI, fib Bulletin, CSA, and JSCE standards. This thesis also includes a description of the punching shear resistance according to Eurocode 2. FRP reinforcement, its mechanical properties, and their behaviour in time are also described. Next, a parametric study was performed that examines the effects of various parameters on the punching shear resistance according to the standards mentioned above. At the end a non-linear analysis using the ATENA software was performed. The practical part includes a structural design of a flat two way slab. The slab uses a steel reinforcement at the bottom, while the top is reinforced with FRP reinforcement. The punching shear design is also included. In the last chapter the serviceability limit state is checked, specifically the slab long-term deflection. The thesis also includes drawings. All calculations were performed in accordance with Eurocode 2 and fib Bulletin No. 40.
117

Statické posouzení vybraných částí ŽB objektu / Static Analysis of Selected Parts of RC Building

Chalupová, Martina January 2019 (has links)
The aim of the diploma thesis is to design, structural check of rainforced elements. The slab, column, wall and staircase is desinged. The internal forces are obtained from Finite Element Method and are checked with the supplementary frame method. The design of elements is based on internal forces form FInite Element Method. Service limite state is check for the slab. All calculations were performed in accordance with valid standard.
118

Nadzemní parkovací dům / Overground Parking House

Pevner, Jan January 2014 (has links)
The work focuses on the design and assessment of selected structural elements of one overground floor monolithic concrete structures and staircases. All calculations are done in accordance with Eurocode 2.
119

Železobetonová konstrukce bytového domu / Reinforced concrete load-bearing construction

Ilčík, David January 2016 (has links)
The diploma thesis is aimed for design and assessment main load bearing elements of a apart-ment building on the ultimate and serviceability limit state. Assessed parts of construction are reinforced concrete slab over the second floor, column and shear wall in the first floor, stairway slab and foundation pad. The elements are assessed in a structural design report according valid standard. There is created drawings. Internal forces are calculated using software Scia Engineer, where is modeled and loaded the construction.
120

Návrh betonové konstrukce pozemní stavby / Design of the building concrete structure

Kurpel, Juraj January 2016 (has links)
The aim of this thesis is to design a load-bearing structure for the ultimate and serviceability limit state of a civil building. The structure is designed as a cast-in-place concrete structure, composed of columns and floor slabs. The building has total of 5 floors, two are under-ground and three above-ground. The thesis contents of a structural design and design options, structural design report for load-bearing elements, processing of the drawings, details, visualizations. Internal forces calculation is carried out in SCIA Engineer and validated by the moment accumulation method for slabs. The columns are assessed by interaction diagrams, one is verified by hand calculation. The resulting internal forces are taken from the computational programme. Foundations are not subject for solution.

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