Dimensions and Correlates of Development in Construction

In light of the limited impact research on construction in developing countries has had on theory and practice, this article discusses the meaning of development as it pertains to construction. The discussion distinguishes between studies addressing construction in developing countries, entailing focus on context and case-based approaches to research, and studies that focus on the process of construction industry development. Progress in research addressing the process of development has been hampered by a lack of data to support the examination of changes in construction industries over time and to compare industries in countries at different stages of economic development. To encourage more process-oriented research, a definition of development in construction is elaborated to include six important dimensions - i.e., important factors affecting construction industry development. Taking into account the lack of relevant statistics, correlates for these dimensions (i.e., statistical proxies) are reviewed. Finally, a manner of graphically presenting these dimensions and correlates is introduced. This graphic format enables visual comparison of conditions affecting construction in different countries. It also provides a frame for relating separate case studies to support comparisons and contributions to theory.

Du savetier au financier: la famille Borel, de Neuchâtel à San Francisco

The Borel Family From Neuchâtel to San Francisco : From shoemaker to banker Did you know that the Cable Car was owned by Swiss citizens? BACKTRACKING : PRIVATE FINANCING OF PUBLIC METROPOLITAN INFRASTRUCTURES Executive Summary: Did you know that one of San Francisco most famous fixtures, the Cable car, was owned by Swiss citizens? Through this detailed study of the Borel family, and its business and investment plans we will observe an example of private financing of public metropolitan infrastructures in the 19th Century and see if it can teach us lessons for tomorrow’s needs? TOPICS Looking at today’s infrastructures, one does not always remember how much work contracting firms had to accomplish in order to produce our contemporary standard of urban comfort . What is to be said of yesterday’s planners or engineers and the credit they deserve? We often hear stories of local events brought to epic proportions, but who are the responsible players who really proved the feasibility of regional infrastructures? Who actually did support, sponsor or finance such achievements? The present study is a trial to propose a new view over such apparently hidden business phenomenons. This research shows us an inspiring case-study of local entrepreneurs who gather key success-factors. The author concentrates on the economic aspect of infrastructure financing to which modern metropolitan society owes its specific urban growth. Contemporary challenges such as job creation, globalisation, technology transfer and local economic development are all interconnected to metropolitan development. XIXTH CENTURY METROPOLITAN INFRASTRUCTURES FINANCING Le Temps, 30th July 1998, D. Masmejan : «Alfred Borel, Auguste’s elder son, enters the finance world. He meets an extraordinary businessman fate. His understanding of the economic impact of the Californian Gold Rush allows him to seize the opportunity of the westward American expansionism. He sails to San Francisco in 1855 where he is the founder of the «Alfred Borel & Company», followed in 1856 by a Mortgage fund (the “Caisse Hypothécaire” bank). The same year sees the foundation of Credit Suisse in Zurich. Alfred Borel investment bank participates in very important infrastructure projects in California and elsewhere in the second half of the XIXth century. At first, its investment into the worldwide famous San Francisco Cable Car is marginal and then becomes overwhelming. Other investments include the “Los Angeles Railway Company” or the “United Railroad Company”, the San Francisco Waterworks, other banks and real estate.» DETAILED RESEARCH ALLOWING TO UNDERSTAND FINANCIAL DECISION MAKING The author reviews financial decision-making through personal correspondence and private accounting in some of those completely documented yearly archives. The «sixth Switzerland» well-connected to the Presbyterian «Huguenot International» cosmopolitan network leads us to detailed research and discoveries. The accounting of 1866 to 1884 goes through the 3rd and 4th San Francisco City real estate crises that the mortgage bankers Borel brothers had to endure. Alfred Borel faced the 2nd Californian real estate crisis (which resulted from the first loss of public interest in gold mines in the years 1854-1858). Then he went back to Switzerland after the death of his father and uncles in order to reconstitute the Swiss end of the pipe connecting his bank’s investors to the Borel family network. He left duty of the day-to-day San Francisco business to his younger brother Antoine after having set up asset management rules. Together both brothers explored new ways of diversifying the investment of the funds they are managing and place them into infrastructures networks. Taking shares «upstream» into equipment industries (for instance the wire works delivering the precise traction rope of cable cars) or other real estate assets, allowed them to guarantee superior interests payments to European investors or creditors in comparison with other financial markets. This anticyclical economic strategy set up their financial success that occurred during the 5th local economic recession, which coincides with the beginning of the big worldwide Victorian economic crisis (1880-1895). UNIQUE SPECIFICITY OF THIS RESEARCH This research process is rarely accomplished in engineering and architecture schools, construction and infrastructures institutes or research centers. The integrity of construction professionals precludes their questioning « where does the whole process originate from?». Builders ultimately considered themselves as «honest craftsmen» that have to dedicate their energy and resources to the proper technical execution of the clients wishes and orders. Customers duty is then to write the project’s specifications and thus to initiate its process. The author of this case-study demonstrates the feasibility of comparisons between similar structural change periods in the XIXth century and the years 1990-2000. Hence, a new theme of interdisciplinary studies for engineers could be implemented by promoting this systemic approach between urban infrastructure financiers, suppliers and users. Last but not least, the insider observations and outsider revelations which are featured in this work are seldom considered in an engineering historical approach. It is not often that an author with a contemporary outsider vision has access to family archives that entirely document bicentennial confidential banker correspondence.

EPFL1999

The development of material-adapted structural form

Sean Dooley

New structural materials can potentially change the technics and economics of the building and construction industry in a profound way. It is important to identify applications and develop forms that exploit a material's unique properties. The developer of a material can use the knowledge of how materials such as steel and reinforced concrete were first introduced to advance the development and application of new materials today. This project examines why structural forms have evolved as they have and what influences the process of creating form, or form-finding. The purpose of this analysis is to aid the development of structural forms that make the most efficient use of material and take advantage of a material's processing and constructive attributes. Such forms are called material-adapted. This thesis is based on the general history of structural materials used in construction. This research is summarized in six appended case studies that comprise the data of the thesis. The research has extended well beyond these case studies; some of this data is included in the main text. The research showed that the influences on form-finding are: Function; Material Properties; Processing Technologies; Connection Technology; Construction Process; Economics; Socio- Political Factors; Knowledge; and Technological Thought. A Form-Finding Influence Interaction Model summarizes the inter-relationships of these influences. It was first assumed that material-adapted form is determined by material properties alone. Further research showed this untrue. The hypothesis of this thesis is that material properties do not unilaterally determine material-adapted structural form. This statement is true because the nature of a material is a function of its properties and its processing and constructive attributes. A material's processing and constructive attributes are dependent on technology and organizational systems that are not specific to the material. It was further hypothesized that new materials are first used substitutionally in forms and applications of known materials. This concept was found to be misleading and untrue for a number of materials. The knowledge of this thesis was used to examine the current development of fiber reinforced polymer composite materials. It is shown that a material's development can be analyzed not only by the aforementioned influences, but also by characteristics of other material developments. This information is used to suggest how these materials might develop in the future.

EPFL2004

Development and application of a numerical simulation system to evaluate the impact of anthropogenic heat fluxes on urban boundary layer climate

Andrea Krpo

Increasing economic development, and growing population, generated during the last decades a very important growth of cities. Urban regions include nowadays more than half of the global population and, by 2030, this proportion is forecasted to increase to three quarters. A consequent more and more extensive use of natural resources, together with increasing anthropogenic activities such as emissions from traffic and factories, or heating from air-conditioning facilities, modify local climate in many different ways, leading to a progressive degradation of life quality in urban areas. Taking these facts into account, there is nowadays a real need for efficient urban planning guidelines and sustainability policies in order to improve life quality in urban areas. Different points should be considered including urban warming, air pollution, human health, economic, and cooling energy needs. The present work goes in this direction, aiming at developing a simulation system for the study of the complex interactions between buildings and the atmosphere. The system of equations describing atmospheric flows is highly non linear and it is common to employ numerical techniques in order to solve them. Moreover, the representation of urban canopy climate, and related air pollution problems, requiree taking the interaction between urban scale (tens of kilometers), and mesoscale (hundreds of kilometers) processes into account. At first, starting from previous studies, a mesoscale meteorological model has been developed as part of this work. Urban induced processes have been considered by implementing inside the model a detailed urban parameterization scheme developed in a previous work. The scheme is able to capture different urban processes, and reproduces the effects of cities in a more accurate way than traditional methods usually used in mesoscale models. However, the heat generated in buildings, and the way this heat is exchanged with the exterior, was not explicitly resolved. In particular, recent studies indicated that anthropogenic heat from air-conditioning facilities can play an important role and should be taken into account for more complete urban climate studies. To this purpose, a Building Energy Model (BEM) has been developed, and coupled to the Urban Canopy Parameterisation (UCP). This building model takes into account the diffusion of heat through walls, roofs, and floors, the natural ventilation, the generation of heat from occupants and equipments, and the consumption of energy through air conditioning systems. Comparisons with other programs indicate that BEM is able to accurately simulate the basic heat transfer phenomena, and to reproduce the heat fluxes exchanged between buildings and the atmosphere. In a second part of the work, the simulation system composed by the Mesoscale Model (MM), UCP, and BEM is tested with respect to one, and two-dimensional configurations. In particular, the impact of BEM on the meteorological variables is analyzed, as well as the efficiency of different urban warming countermeasures, and cooling energy demands control strategies. Two-dimensional results are then utilized as guidance for the application of MM-UCP-BEM over the realistic configuration including the city of Basel and the surrounding areas. At first, comparisons of urban and rural simulated temperatures with measures provided by the BUBBLE project (Basel Urban Boundary Layer Experiment), have shown that the model could reasonably well reproduce the variations in outdoor air temperature. In a second time, the simulations considered for the two-dimensional configuration are applied to the case of Basel. Numerical results confirm that anthropogenic fluxes from air-conditioning facilities can have a non negligent impact on the urban meteorology. Typically, they modify the outdoor temperature and increase the Urban Heat Island (UHI) phenomenon. In the last part of the study, the applicability of the model in performing urban warming countermeasures, and cooling energy demands control strategies, is evaluated. In this purpose in mind, a sensitivity analysis is carried out indicating that appropriate physical properties of built materials, efficient air-conditioning systems, and the application of simple energy saving policies, can lead to very important cooling energy savings. In general, the application of BEM inside the UCP allows computing the heat released into the atmosphere by air-conditioning facilities, as well as the corresponding feedbacks produced on the different meteorological variables. It also increases the capability of the urban parameterisation to provide more detailed studies of urban warming countermeasures, and cooling energy demands in real cities.

EPFL2009