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CumInCAD is a Cumulative Index about publications in Computer Aided Architectural Design
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_id	ddss2008-02
id	ddss2008-02
authors	Gonçalves Barros, Ana Paula Borba; Valério Augusto Soares de Medeiros, Paulo Cesar Marques da Silva and Frederico de Holanda
year	2008
title	Road hierarchy and speed limits in Brasília/Brazil
source	H.J.P. Timmermans, B. de Vries (eds.) 2008, Design & Decision Support Systems in Architecture and Urban Planning, ISBN 978-90-6814-173-3, University of Technology Eindhoven, published on CD
summary	This paper aims at exploring the theory of the Social Logic of Space or Space Syntax as a strategy to define parameters of road hierarchy and, if this use is found possible, to establish maximum speeds allowed in the transportation system of Brasília, the capital city of Brazil. Space Syntax – a theory developed by Hillier and Hanson (1984) – incorporates the space topological relationships, considering the city shape and its influence in the distribution of movements within the space. The theory’s axiality method – used in this study – analyses the accessibility to the street network relationships, by means of the system’s integration, one of its explicative variables in terms of copresence, or potential co-existence between the through-passing movements of people and vehicles (Hillier, 1996). One of the most used concepts of Space Syntax in the integration, which represents the potential flow generation in the road axes and is the focus of this paper. It is believed there is a strong correlation between urban space-form configuration and the way flows and movements are distributed in the city, considering nodes articulations and the topological location of segments and streets in the grid (Holanda, 2002; Medeiros, 2006). For urban transportation studies, traffic-related problems are often investigated and simulated by assignment models – well-established in traffic studies. Space Syntax, on the other hand, is a tool with few applications in transport (Barros, 2006; Barros et al, 2007), an area where configurational models are considered to present inconsistencies when used in transportation (cf. Cybis et al, 1996). Although this is true in some cases, it should not be generalized. Therefore, in order to simulate and evaluate Space Syntax for the traffic approach, the city of Brasília was used as a case study. The reason for the choice was the fact the capital of Brazil is a masterpiece of modern urban design and presents a unique urban layout based on an axial grid system considering several express and arterial long roads, each one with 3 to 6 lanes,
keywords	Space syntax, road hierarchy
series	DDSS
last changed	2008/09/01 17:06

_id	ddss2008-20
id	ddss2008-20
authors	Holanda, Frederico de; Valério Medeiros and Ana Paula Barros
year	2008
title	Integration through city space-formUsing space syntax, traffic modelling and geoprocessing tools forevaluating new urban developments
source	H.J.P. Timmermans, B. de Vries (eds.) 2008, Design & Decision Support Systems in Architecture and Urban Planning, ISBN 978-90-6814-173-3, University of Technology Eindhoven, published on CD
summary	New boroughs are continuously being built in Brasilia, Brazil’s Capital City. The paper deals with the performance of such boroughs concerning sociospatial segregation. A comparison is made between two proposals for a new borough to the West of the North Wing of the Pilot Plan, which was originally designed by Lucio Costa. The first proposal was made by a wellknown architectural studio in Brasilia and is beginning to be implemented. The second proposal is an exercise made by undergraduate students from the School of Architecture of the University of Brasilia, under the supervision of one the authors of the paper. The two proposals present very different performances. In the first case, the borough is set apart from the immediate urban surroundings; there is no direct connection between inner roads and the main arteries that surround the site. In the second case, the students have proposed a scheme that connects the interior areas of the borough to the vicinity; we hardly know where the new borough begins vis-à-vis the neighbouring areas. We argue that there are serious traffic implications in the first case, as well as sociological implications. We deal with traffic modelling, space syntax techniques and geoprocessing tools to prove so. Furthermore, we will show how the building types are as well socially inadequate, for they will imply homogeneous social layers among the inhabitants – namely exclusively high-middle class living in the new area.
keywords	Space syntax, traffic modelling, urban expansion, urban design
series	DDSS
last changed	2008/09/01 17:06

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