Made available in DSpace on 2015-04-01T11:58:35Z (GMT). No. of bitstreams: 1 ArquivoTotal.pdf: 14559987 bytes, checksum: 9b4507a6e10405ffdb0e9eb96614b9df (MD5) Previous issue date: 2013-07-19 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / The first skyscrapers of the city of Joao Pessoa arose in the late 1950, these constructions were treated as a symbol of progress and modernity in the creation of this metropolis. Considering the existence of two distinct periods that marked the form of the skyscrapers in the city, we have in the beginning of the 1980 the construction process was desenvolved in a formal manner. The present paper proposes an analysis of arquitectual form of the residential skyscrapers built in the city of Joao Pessoa between the years of 1979-1989, with the objective of identifying eventual patterns in the relationship between the constituting elements of this form that characterizes these buildings. / A cidade de João Pessoa teve seus primeiros edifícios altos construídos no final da década de 1950, estas obras foram tratadas como símbolo de progresso e modernidade na almejada construção da imagem de uma metrópole. Considerando a existência de dois períodos que marcaram a forma dos edifícios altos na cidade de João Pessoa, toma-se como premissa a ideia de que a partir da década de 1980 o processo viria a se desenvolver apoiado sobre um novo repertório formal. O presente trabalho propõe uma análise para a forma arquitetônica dos edifícios altos construídos na cidade de João Pessoa entre os anos 1979 e 1989, tendo como objetivo identificar eventuais padrões nas relações entre os elementos constituintes desta forma que caracterizam tais edifícios na cidade e período em questão.

Skybridges and atria between buildings are becoming more and more popular. Most current skybridge connections are either roller or rigid-connections. This dissertation presents an investigation of the structural analysis and optimization of skyscraper systems with hinge-connected skybridges, and compares the results to skyscraper systems with roller-connected skybridges and to skyscraper systems without skybridges altogether. Also presented is an investigation of the structural analysis and optimization of skyscrapers both with and without atria between the buildings. It was assumed that the atria envelope was constructed with cushions made from lightweight, transparent, and flexible Ethylene Tetrafluoroethylene (ETFE). A simplified skyscraper skybridge model (SSSM) was developed to approximate analysis of such systems. The SSSM identifies and includes only the dominant degrees of freedom (DOF's) when assembling the structure stiffness matrix. This greatly reduces computational time and computer memory compared to traditional finite element models (FEM). The SSSM is fast enough to be used with both gradient-based and genetic optimization algorithms. The steps of the SSSM consist of: 1) determination of megacolumn areas, 2) constructing the stiffness matrix, 3) evaluation of volume, weight, mass and period, 4) calculation of lateral force vectors, and 5) calculation of displacement and stress constraints. Three skyscraper systems were analyzed using both the SSSM and a FEM to compare both the accuracy and efficiency of the SSSM. It was found that the SSSM was very accurate for displacements (translations and rotations), and core, megacolumn, outrigger, and skybridge stress. It was also found that the SSSM analysis time was significantly faster and used far less computer memory than FEM. Four skyscraper systems were optimized for two different sites, with varying atria and skybridge conditions, using gradient-based and genetic optimization algorithms. The optimization strategy consisted of a series of executions of the sequential quadratic programming (SQP) algorithm, followed by executions of the generalized reduced gradient (GRG) algorithm, followed by executions of a discrete genetic algorithm. The genetic algorithm made significant progress for two of the systems. Optimal results showed that in some cases hinge skybridges and atria envelope produced significantly lighter systems compared to roller, no skybridge, or without atria envelope cases.

What does Mexico mean to the cultural imagination of the United States? What has it meant in the past? In what ways has the U.S. incorporated aspects of Mexican culture into its own? This dissertation explores these questions of cultural and intellectual exchange between the U.S. and Mexico during the 1920s and 1930s by positioning itself amid the present “transnational” and “hemispheric” turn in U.S. literary study. Its subject matter ranges from architecture and urbanism to journalism and travel writing to short stories and novels to muralism and the visual arts. Such an interdisciplinary approach is bolstered by crossing scales of geography from the international to the continental, the national, the regional and the local. Positioning the discussion in geographic terms allows one to see how the possibilities for cultural exchange could never be fully realized, as the ways in which U.S. writers and intellectuals understood Mexico-- then and now-- can rarely be separated from either the physical proximity or the cultural dissimilarity of the two countries, a relationship that has been described as one of “distant neighbors.” This dissertation takes the spatial components of culture seriously, employing useful concepts from the disciplines of human geography and cultural landscape studies to inform its understanding of how diverse figures ranging from Conrad Aiken, Stuart Chase, José Clemente Orozco, Katherine Anne Porter, Sophie Treadwell, William Carlos Williams-- among others less widely known-- understood Mexico and presented it to a U.S. audience during the interwar period. Their narratives often employ the symbolic landscape of Mexico to communicate the qualities of Mexican culture while unwittingly obscuring the reality of what the country itself. Nonetheless, each example points to possible correctives in the pattern, offering a hemispheric perspective from which much can still be learned today. / English

published_or_final_version / Architecture / Master / Master of Architecture

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Architecture, 1988. / Includes bibliographical references. / The "skyscraper problem" challenged the thought and practice of civic designers and architects prior to World War I. It referred to the incompatibility of City Beautiful principles with economically propelled land development, and to the contradiction between the notion of architecture as an art and the skyscraper's programmatic and technical requirements. Civic designers in New York had difficulty accommodating the skyscraper in their large-scale plans. They also found that it intruded on their vision for the business street, hindered their attempts to plan City Hall Park as New York's civic center, and created a chaotic skyline. Bruce Price, Louis Sullivan, Thomas Hastings, Cyrus L.W. Eidlitz, and other architects suggested alternative proposals for subjecting the skyscraper to the constraints of design . Prior to the design of the Woolworth Building, however, architectural critics did not unanimously endorse any single approach. Frank Woolworth chose a site for his proposed headquarters at the intersection of City Hall Park, New York's civic center, with lower Broadway, the spine of its business district . Woolworth commissioned Cass Gilbert to design the Woolworth Building in 1910. Gilbert shared the City Beautiful vision of McKim, Mead & White and Daniel Burnham. He also accepted the skyscraper's pragmatic requirements. Woolworth intended his headquarters to function as a speculative office building, but also to look like a civic institution. The imagery of a civic institution would represent the capitol of his commercial "empire" as well as display his civic-mindedness, wealth, and cosmopolitanism. The Woolworth Building's siting at New York's civic center, its composition, its arcade, and its sculptural and mural decoration identified it with the prevailing concept of the civic building. The soaring vertical piers of its exterior recalled Gilbert's earlier design for the West Street Building, which was influenced by the functionalist ideas of Louis Sullivan. The Woolworth Building convinced critics that a suitable architectural expression could be found for the skyscraper. Zoning reformers regarded it as a benign skyscraper. Contemporary observers attuned to City Beautiful aesthetic principles thought that the Woolworth Building strengthened the order and image of New York's civic center and enhanced the view of the city from afar. / by Gail Fenske. / Ph.D.

This dissertation examines the use of statistical models for prediction. Examples are drawn from public policy and chosen because they represent pressing problems facing U.S. governments at the local, state, and federal level. The first five chapters provide examples where the perfunctory use of linear models, the prediction tool of choice in government, failed to produce reasonable predictions. Methodological flaws are identified, and more accurate models are proposed that draw on advances in statistics, data science, and machine learning. Chapter 1 examines skyscraper construction, where the normality assumption is violated and extreme value analysis is more appropriate. Chapters 2 and 3 examine presidential approval and voting (a leading measure of civic participation), where the non-collinearity assumption is violated and an index model is more appropriate. Chapter 4 examines changes in temperature sensitivity due to global warming, where the linearity assumption is violated and a first-hitting-time model is more appropriate. Chapter 5 examines the crime rate, where the independence assumption is violated and a block model is more appropriate. The last chapter provides an example where simple linear regression was overlooked as providing a sensible solution. Chapter 6 examines traffic fatalities, where the linear assumption provides a better predictor than the more popular non-linear probability model, logistic regression. A theoretical connection is established between the linear probability model, the influence score, and the predictivity.

No description available.

In this diploma thesis, I have tried to design a high-rise building in Brno and offer new opportunities for built -up areas in a manner that respects the future of urban development. I have applied the principles of the nature patterns on the very structure of the building and thus I have reached the perfection of nature which in my view offers an elegant, simple and already proven solution.

Syftet med denna studie har varit att belysa föreställningen om höga hus i den samtidaarkitektur- och stadsplanediskursen i svensk media. Genom att konkretisera vilka idéer ochvärdering som kommer till uttryck har vi även synliggjort vilka ståndpunkter som ställerdebattörer för eller mot fenomenet. Diskursanalys har använts som teori och metod med enutgångspunkt i socialkonstruktivismen, där diskurser genom visuell och verbal retorik betraktaskonstruera den sociala verkligheten. För detta arbete har 23 utvalda artiklar från dagspress ochfackpress utgjort det empiriska materialet. Resultatet visar på tre parallella diskurser som gåratt urskilja i utsagorna, vilka är Maktposition, Arkitektonisk kvalitet och Staden förändras.Slutsatserna visar på att kritik mot höghusdebatten kan kopplas till tankar om rationellplanering och avsmak mot 1960-talets funktionalistiska planeringsideal. Slutsatserna visaräven på att samtida diskurser blir en riktlinje för vad som bör prioriteras ur ett planerings- ochutvecklingssammanhang. Media har ett stort inflytande över vilka diskurser somuppmärksammas, och följaktligen vilka sakfrågor som är framträdande i samhällsutvecklingen. / The purpose of this study has been to shed light on the notion of tall buildings in thecontemporary architecture and urban planning discourse in the Swedish media. By concretizingwhich ideas and values are expressed, we have also made visible which viewpoints that positiondebaters for or against the phenomenon. Discourse analysis has been used as a theory andmethod based on social constructivism, where discourses through visual and verbal rhetoric areconsidered to construct social reality. For this study, 23 selected articles from the daily pressand the scientific press constituted the empirical material. The results show three paralleldiscourses that can be distinguished in the statements, which are Position of Power,Architectural quality and The city is changing. The conclusions show that criticism of the highrise debate can be linked to ideas about rational planning and distaste for the functionalistplanning ideal of the 1960s. The conclusions also show that contemporary discourses becomea guideline for what should be prioritized from a planning and development context. The mediahas a great deal of influence over which discourses are noticed, and consequently which issuesare prominent in the development of society.

The Tubed Mega Frame is a new concept for constructing high-rise buildings,based on the idea of moving the main bearing system to the perimeter of thebuilding by using a number of large hollow columns, mega tubes, connected byperimeter walls at certain levels. The concept is under development by Tyréns ABand has not yet been implemented in reality. This thesis is part of the ongoing workprocess and has the aim of shedding light on the issues and problems with the newconcept when it comes to the perimeter walls. The perimeter walls are an essential part of the Tubed Mega Frame structure sincethey provide the main lateral stability of the structure by connecting the mega tubesand transferring lateral loads between them. It is therefore of big importance thatthe walls are designed and constructed to withstand all the loads they wouldpossibly be exposed to.In this thesis a perimeter wall in a prototype building of the Tubed Mega Framehave been analysed, designed and tested using non-linear FE-analysis in the pursuitof create a better understanding in how the perimeter walls works and should bedesigned. To begin with, a global analysis was performed to obtain the forces acting on themost critical perimeter wall. The stresses in the wall were then analysed in order tocreate an appropriate strut-and-tie model used to determine the reinforcementdesign for the specified perimeter wall. The perimeter wall was designed for amaximum shear force of 14.5 MN and corresponding moment of 87 MNm usingstrut-and-tie model according to American standards, ACI 318-11. The final step was to verify the design using the non-linear FE-analysis programATENA. A model of the reinforced wall was analysed with two different loadcases; one were the resistance was determined by unidirectional deformation untilfailure and one were the effects of cyclic loading was considered by initialdeformation corresponding to service loads prior to failure loading. The resistanceobtained from the first load case was 46.8 MN and for the second 19.1 MN usingmean values for material properties. In order to obtain a design resistance of the wall in the non-linear analysis, a globalsafety factor was determined by using the ECOV method. The design resistance were 39.9 and 13.5 for the two load cases respectively. / Tubed Mega Frame (TMF) är ett nytt koncept för att bygga höghus som bygger påidén om att flytta det bärande systemet till omkretsen av byggnaden med hjälp avett antal stora ihåliga pelare, megatuber, anslutna med omslutande tvärväggar påvissa våningsplan. Konceptet är under utveckling av Tyréns AB och har ännu integenomförts i verkligheten. Detta examensarbete är en del i den pågående processenoch målet är att belysa frågor och problem som finns med det nya konceptet närdet gäller de omslutande tvärväggarna. De omslutande tvärväggarna är en vital del av Tubed Mega Frame eftersom debidrar till huvudsakliga sidostabiliteten i byggnaden genom att sammankopplamegatuberna och överföra horisontalkrafter mellan dem. Det är därför av stor viktatt väggarna är konstruerade och tillverkade för att stå emot alla de belastningarsom de skulle kunna vara utsatta för. I detta examensarbete har en tvärvägg i en prototypbyggnad för Tubed MegaFrame analyserats, dimensionerats och testats med syftet att bidra till en bättreförståelse för hur tvärväggarna fungerar och bör utformas. Till att börja med har en global analys utförts för att erhålla de krafter som verkarpå den mest kritiska tvärväggen. Spänningarna i väggen analyserades sedan för attskapa en lämplig fackverksmodell som sedan användes för att bestämmaarmeringsutformning för den specificerade tvärväggen. Väggen dimensioneradesför en maximal tvärkraft på 14,5 MN och ett motsvarande moment på 87 MNmgenom att använda fackverksmetoden enligt amerikanska standarder, ACI 318-11. Det sista steget var att kontrollera konstruktionen med hjälp av det ickelinjära FE-analysprogrammet ATENA. En modell av den armerade väggen analyserades medtvå olika lastfall. I det första lastfallet genom att i en riktning deformera väggen tillbrott. I det andra lastfallet beaktades tidigare uppsprickning genom att först belastaväggen med en deformation motsvarande dess brukslast och sedan belasta väggen imotsatt riktning tills brott uppstod. Bärförmågan var 46,8 MN och 19,1 MN förrespektive lastfall, beräknat med medelvärden för materialegenskaper. För att erhålla en dimensionerande bärförmåga för väggen ur den ickelinjäraanalysen bestämdes en global säkerhetsfaktor med hjälp av ECOV-metoden.Dimensionerande bärförmåga var 39,9 MN och 13,5 MN för respektive lastfall.