A model of dynamic programming for repairing strategies of concrete structures during a projected service period is proposed, which takes into account the degradation in strength of components and the probability of a...A model of dynamic programming for repairing strategies of concrete structures during a projected service period is proposed, which takes into account the degradation in strength of components and the probability of accidental load. This model takes the safety grade of a structural system as the state variable of repairing strategies, and incorporates economic factors including expected repair cost, property loss due to structure failure, goods and material loss due to structure failure, loss of production interrupt due to structure failure, and inspection cost in decision making. It is found that the optimal repairing strategies are sensitive to the probability of accidental loads as well as the failure costs. The practicality of the model is demonstrated by an example.展开更多
The lack of proper maintenance in buildings is responsible for various anomalies, which can cause property and personal damage. The objective of this study is to analyze the maintenance management of the administratio...The lack of proper maintenance in buildings is responsible for various anomalies, which can cause property and personal damage. The objective of this study is to analyze the maintenance management of the administration building at the Technological Park UFRJ/Brazil, trying to emphasize the relation between maintenance and good performance of the building and to demonstrate the need to develop a consistent maintenance system to achieve an efficient maintenance management. The study allowed to present strategies and possibilities of interventions, in addition to proposing the essential aspects for the development of a structured maintenance system. After reviewing the issue of building maintenance under the various perspectives presented, the importance of planning a preventive building maintenance, according to standards, to achieve the level of performance expected for the building, besides being essential the search for tools and methods that can increase the efficiency of management can be concluded. It is also pertinent to conclude that prevention is the most effective solution against the depreciation factors that affect a building, being the most economical viable, and ensuring other benefits for the building and its users, such as security, property valuation and attendance to the warranty period.展开更多
F estningens Materialgard is a listed complex located in downtown Copenhagen. The refurbishment of the listed complex was studied to provide knowledge on how a process for refurbishing heritage buildings can be carri...F estningens Materialgard is a listed complex located in downtown Copenhagen. The refurbishment of the listed complex was studied to provide knowledge on how a process for refurbishing heritage buildings can be carried out successfully, as refurbishment of heritage buildings is often a complicated process. The process shows how to choose, evaluate and implement measures creating synergy between the interests of preserving heritage values and to develop affordable refurbishment that meets the requirements for the future use of the building. The refurbishment followed included restoration, energy upgrading and refurbishment of the individual buildings that make up the listed complex. The process focuses on the cooperation and dialogue between the parties involved. F estningens Materialgard is a case study where the Heritage Agency, the Danish Working Environment Authority and the owner as a team cooperated in identifying feasible refurbishment measures. Through the process the owner was supported by architects and engineers. Focus is put on how, to identify potential energy savings and, to decide on energy upgrading measures when refurbishing and restoring listed buildings. The refurbished Faestningens Materialgard is visualized in photos.展开更多
A large number of towns along the Sanriku coastal line were swept away by tsunami attacks on March 11,2011. Although some heritage buildings survived, the damage condition was too severe to carry on repair and restore...A large number of towns along the Sanriku coastal line were swept away by tsunami attacks on March 11,2011. Although some heritage buildings survived, the damage condition was too severe to carry on repair and restore them to the owners. As the municipal cultural heritage division and local cultural society in Kesennuma City were looking for possibility to save these damaged heritage buildings, the author gave them full assistance. To apply for fund for the repair and restoration work to related foundations, the author made an investigation of the damage conditions, prepared measured drawings, fundamental restoration plans and cost estimates. Domestic and international foundations granted funds to our projects for three years in May 2012, and we formed a restoration body to take responsibility of repair and restoration work. But soon, we were faced with several difficulties. The first is that we had to wait for a long time until the authority fixed the town redevelopment plan, meeting the National Guideline of Tsunami-Free Redevelopment. The second is that the building cost continued to increase during rapid-development periods. Although the author expected to complete the whole work within three years, the progress is really slow, and has not amounted to a quarter.展开更多
基金Funded by the National Key Project on Basic Research and Applied Research (85-40).
文摘A model of dynamic programming for repairing strategies of concrete structures during a projected service period is proposed, which takes into account the degradation in strength of components and the probability of accidental load. This model takes the safety grade of a structural system as the state variable of repairing strategies, and incorporates economic factors including expected repair cost, property loss due to structure failure, goods and material loss due to structure failure, loss of production interrupt due to structure failure, and inspection cost in decision making. It is found that the optimal repairing strategies are sensitive to the probability of accidental loads as well as the failure costs. The practicality of the model is demonstrated by an example.
文摘The lack of proper maintenance in buildings is responsible for various anomalies, which can cause property and personal damage. The objective of this study is to analyze the maintenance management of the administration building at the Technological Park UFRJ/Brazil, trying to emphasize the relation between maintenance and good performance of the building and to demonstrate the need to develop a consistent maintenance system to achieve an efficient maintenance management. The study allowed to present strategies and possibilities of interventions, in addition to proposing the essential aspects for the development of a structured maintenance system. After reviewing the issue of building maintenance under the various perspectives presented, the importance of planning a preventive building maintenance, according to standards, to achieve the level of performance expected for the building, besides being essential the search for tools and methods that can increase the efficiency of management can be concluded. It is also pertinent to conclude that prevention is the most effective solution against the depreciation factors that affect a building, being the most economical viable, and ensuring other benefits for the building and its users, such as security, property valuation and attendance to the warranty period.
文摘F estningens Materialgard is a listed complex located in downtown Copenhagen. The refurbishment of the listed complex was studied to provide knowledge on how a process for refurbishing heritage buildings can be carried out successfully, as refurbishment of heritage buildings is often a complicated process. The process shows how to choose, evaluate and implement measures creating synergy between the interests of preserving heritage values and to develop affordable refurbishment that meets the requirements for the future use of the building. The refurbishment followed included restoration, energy upgrading and refurbishment of the individual buildings that make up the listed complex. The process focuses on the cooperation and dialogue between the parties involved. F estningens Materialgard is a case study where the Heritage Agency, the Danish Working Environment Authority and the owner as a team cooperated in identifying feasible refurbishment measures. Through the process the owner was supported by architects and engineers. Focus is put on how, to identify potential energy savings and, to decide on energy upgrading measures when refurbishing and restoring listed buildings. The refurbished Faestningens Materialgard is visualized in photos.
文摘A large number of towns along the Sanriku coastal line were swept away by tsunami attacks on March 11,2011. Although some heritage buildings survived, the damage condition was too severe to carry on repair and restore them to the owners. As the municipal cultural heritage division and local cultural society in Kesennuma City were looking for possibility to save these damaged heritage buildings, the author gave them full assistance. To apply for fund for the repair and restoration work to related foundations, the author made an investigation of the damage conditions, prepared measured drawings, fundamental restoration plans and cost estimates. Domestic and international foundations granted funds to our projects for three years in May 2012, and we formed a restoration body to take responsibility of repair and restoration work. But soon, we were faced with several difficulties. The first is that we had to wait for a long time until the authority fixed the town redevelopment plan, meeting the National Guideline of Tsunami-Free Redevelopment. The second is that the building cost continued to increase during rapid-development periods. Although the author expected to complete the whole work within three years, the progress is really slow, and has not amounted to a quarter.
