1,566 research outputs found
A "Fabric First" Approach to Sustainable Tall Building Design
No full textThis research suggests the most effective way for improving energy efficiency in tall buildings is a ‘fabric first’ approach. This involves optimising the performance of the building form and envelope as a first priority, with additional technologies a secondary consideration. The paper explores a specific fabric first energy standard known as ‘Passivhaus’. Buildings that meet this standard typically use 75% less heating and cooling. The results show tall buildings have an intrinsic advantage in achieving Passivhaus performance, as compared to other low-rise buildings, due to their compact form, minimising heat loss. This means highrise can meet Passivhaus energy standards with double-glazing and mid-levels of insulation as compared to other typologies where triple glazing and superinsulation are commonplace. However, the author also suggest that designers need to develop strategies to minimise overheating in Passivhaus high-rise, and reduce the quantity of glazing typical in high-rise residential buildings to improve their energy efficiency
Perceived factors for the effectiveness of online learning for licensed commercial banks in Sri Lanka
No full textThe main focus of this research is to measure the effectiveness of online training in banking industry. The study includes any kind of training program which comes under the computer based training, and it examines the effectiveness of these training
programs with respect to their current involvement in the bank. The study also includes a discussion on how these trainings contribute to employee satisfaction. The
findings are based on responses from questionnaires distributed among banking staff
of selected banks in printed form and by email. The information gathered is subjected to a statistical analysis to derive conclusions.
This research is based on the timely requirement of the industry, factors extracted from previous research work, and expert views. The major factors looked at in this study are, background of the employee related to the bank and its training, type of materials offered in a computer based training, the kind of subjects selected to be offered in computer based training, perception of participated employees, provided infrastructure facilities, and banks contribution to the training programs.
This paper focuses on a selected sample of licensed commercial banks in Sri Lanka to identify the current level of usage of online learning mode and the effectiveness of
online mode of learning for their staff training. It aims to also discuss how this mode can contribute to employee satisfaction in different banks.
As per the findings from this research work, the author claims that the effectiveness of online mode of learning considerably depends on training materials, participants contribution, subject area and ICT infrastructure used in a training program. Also, there is a significant level of employee satisfaction gained by offering online learning
mode of training programs in a bank
Students in high-rise: Aspects influencing the design of tall timber buildings
No full textTall timber buildings are of growing interest worldwide and also in the Netherlands. With the introduction of CLT, higher timber buildings are possible compared to traditional timber frame housing. Tall timber buildings can be made as modular buildings or as buildings with a CLT or concrete core and a timber wall/column-floor system that can contribute to the overall stability. In this paper, master student thesis projects dealing with various aspects of timber highrise buildings are presented. These include the possibilities of using 3D-modules in high-rise buildings, design aspects of differential vertical shortening, parametric design, as well as wind-induced behaviour. For tall timber buildings specific aspects as the influence of the connections on the stability and comfort (accelerations), and the necessity of performing a phased analysis to account for the different creep behaviour of timber and concrete. When this is done properly, tall timber buildings can be designed with various structural appearances, fulfilling the requirements and the wishes of architects and users. The raised technical questions have been incorporated in the teaching program of Delft University of Technology and formed the basis for the master thesis projects presented in this paper.Accepted Author ManuscriptBio-based Structures & Material
TALL - Design for the Schiekadeblok
No full textTALL - Design for the SchiekadeblokTALLMaterialisationArchitectur
Distribution of strong earthquake input energy in tall buildings equipped with damped outriggers
No full textThe seismic design of optimal damped outrigger structures relies on the assumption that most of the input energy will be absorbed by the dampers, whilst the rest of the structure remains elastic. When subjected to strong earthquakes, nevertheless, the building structure may exhibit plastic hinges before the dampers begin to work. In order to determine to which extent the use of viscously damped outriggers would avoid damage, both the host structure's hysteretic behaviour and the dampers' performance need to be evaluated in parallel. This article provides a parametric study on the factors that influence the distribution of seismic energy in tall buildings equipped with damped outriggers: First, the influence of outrigger's location, damping coefficients, and rigidity ratios core-to-outrigger and core-to-column in the seismic performance of a 60-story building with conventional and with damped outriggers is studied. In parallel, nonlinear behaviour of the outrigger with and without viscous dampers is examined under small, moderate, strong, and severe long-period earthquakes to assess the hysteretic energy distribution through the core and outriggers. The results show that, as the ground motion becomes stronger, viscous dampers effectively reduce the potential of damage in the structure if compared to conventional outriggers. However, the use of dampers cannot entirely prevent damage under critical excitations.Accepted Author ManuscriptOLD Structural Desig
Energy dissipation and performance assessment of double damped outriggers in tall buildings under strong earthquakes
No full textThe use of a single set of outriggers equipped with oil viscous dampers increases the damping ratio of tall buildings in about 6–10%, depending on the loading conditions. However, could this ratio be further increased by the addition of another set of outriggers? Should this additional set include dampers too? To answer these questions, several double damped outrigger configurations for tall buildings are investigated and compared with an optimally designed single damped outrigger, located at elevation 0.7 of the total building's height (h). Using free vibration, double outrigger configurations increasing damping up to a ratio equal to the single-based optimal are identified. Next, selected configurations are subjected to several levels of eight ground motions to compare their capability for avoiding damage under critical excitations. Last, a simplified economic analysis highlights the advantages of each optimal configuration in terms of cost savings. The results show that, within the boundaries of this study, combining a damped outrigger at 0.5h with a conventional outrigger at 0.7h is more effective in reducing hysteretic energy ratios and economically viable if compared with a single damped outrigger solution. Moreover, double damped outrigger configurations for tall buildings exhibit broader display of optimal combinations, which offer flexibility of design to the high-rise architecture.OLD Structural DesignApplied Mechanic
Density, form and performance
No full textA redefinition of building economics towards sustainability will include the spatial approach of green field investments and most of all necessary intensification of brown field development. For large parts of Western Europe and the US the latter will be, according to economic principles of concentration and revaluation of city life, the main focus in development. Like the rest of the world, the growth of cities seems irreversible and a continuous fight against sprawl. Other studies reveal that sustainable economics require focus and insight on building characteristics. So density is the focal point. Urban quality can be partly quantified in parameters like Floor Space Index (FSI - intensity), Ground Space Index (GSI - compactness), Open Space Ratio (OSR - pressure on open space) and height. The density and the morphology of the urban fabric can be adequately described by these parameters, using plot charts where the different parameters are placed on the axis and the elements are plotted and analysed. The value of real estate property is determined by the building value and the land value. The building value is related to the location due to rent levels enabling building quality, urban quality and contextual (functional and economical quality). The land value should be almost equivalent to location value and, at least at the start of the process, is calculated using the looked-for Floor Space Index. It is expected that performance of real estate objects, categorised in different sets, defined by these urban parameters will show similar grouping, by which the density related behaviour can be forecasted. Used as a tool to analyse a portfolio it will give insight in the relation of this stock and density. This tool and gained insight is especially needed for emphasising externalities of density to a project scope. The central question “Why Tall?” can be answered by these regional advantages. At the same time urban planners, at least in Rotterdam, require tall buildings iconic by slenderness, an effect further stressed by regulation. This city is exemplary for a situation in which it is already hard to distinguish a need for going high. All externalities have to be taken into account. Even beyond economic viability, the fineness creates a setback on the performance by density. The original density plot charts are twodimensional. By adding colour the performance is shown and by using marker styles the impact of building volume related to the financial indicators can be clarified.Real Estate and HousingArchitectur
Exploring the skyline of Rotterdam and The Hague: Visibility Analysis and Its Implications for Tall Building Policy
No full textThis paper presents a systematic approach to analysing the visual impact of tall building evolution on cities and their surrounding landscape, using Rotterdam and The Hague as case studies. Critical tall building clusters that visually determine the skyline of both cities are identified and allow comparison of actual tall building development and the urban policies in place. The research demonstrates that a considerable distance exists between policy and reality. Both Rotterdam and The Hague struggle to deliver a consistent and integrated policy for tall-rise urban areas, while tall building developments seem to be ruled by an internal logic not fully recognized in policy-making. Using the visibility of the skyline to identify tall building clusters suggests that both cities could allow developments in a much wider area than originally envisioned in their guidance on tall buildings. Although each new tall building design faces public and political scrutiny, the fact is that the visibility pattern in both cities is already established. Each new development has a decreasing impact as long as it is confined to the established tall building cluster. As shown in the paper, GIS-based visibility analysis is a powerful tool for tall building planning and design, not only increasing understanding of actual developments and their effects in a precise and quantifiable manner, but also helping to evaluate and develop tall building policies.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Landscape Architecture100% ResearchOLD Urban Desig
ON REPRESENTATION AND POWER: PORTRAIT OF A VODUN LEADER IN PRESENT-DAY BENIN
No full textInternational audienceIn this paper, the author discusses the power of vodun leaders in present-day Benin, and more specifically anti-witchcraft cults born from the encounter with world religions. Offering an analysis inspired by Louis Marin’s theory on power in its representation, the author illustrates her analysis through the portrait of a vodun leader with a view to escape from a functionalist analysis of occult power or syncretism. With the baroque mirror metaphor conceived as a device, which underscores what it is that connects heterogeneous practices, Tall describes what is shown in the rituals and practices of a vodun leader and emphasizes the centrality of the transubstantiation phenomenon in the production of a community of believers.Dans cet article, l’auteur s’intéresse au pouvoir des chefs de cultes vodun dans le Bénin contemporain. S’attachant plus particulièrement aux leaders de cultes anti-sorcellerie nés de la rencontre avec les religions universalistes, elle propose une analyse inspirée des travaux de Louis Marin sur le pouvoir dans sa représentation et construit son propos à travers le portrait d’un chef de culte pour échapper aux analyses fonctionnalistes en termes de pouvoir occulte ou de syncrétisme. A travers la métaphore du miroir baroque conçu comme un dispositif qui met en lumière ce qui articule des pratiques hétérogènes, E.K. Tall s’attache à ce que montrent les rituels et les pratiques d’un officiant tout en illustrant la centralité du phénomène de transsubstantiation dans la production d’une communauté de croyants
Database for: Excavations at Tall Jawa, Jordan: Volume 3, The Iron Age Pottery
No full textThis is a Microsoft Access database of imagery, drawings, and photos accompanying Excavations at Tall Jawa, Jordan: Volume 3, The Iron Age Pottery by P.M. Michèle Daviau. The text and database present a detailed typology of the Iron Age pottery excavated from 1989 to 1995. Together, they represent an in-depth analysis of the forming techniques employed to make each type of vessel from bowls to colanders, cooking pots to pithoi.
The digital archive is a work in progress by the author. The archive currently holds the collection for Excavation Field D. Upon completion, it will include seven collections, each one consisting of a database of diagnostic sherds and vessels as well as the images of these pots as .tiff files. Databases are related to excavation fields and are designed for meaningful searches: A, B, C-east, C-west, A-east (associated with C-west), D and E
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