This article presents a methodology for the seismic vulnerability assessment of current buildings, suitable for the study of historical centers at the regional scale. The applicability is demonstrated with reference to four case studies: the historical center of the city of Foggia (Italy) and three other small towns of this province, for a total of 4519 housing units. Field data were collected by several teams of technicians by means of a survey form, provided in electronic format. The subsequent data processing and drawing of vulnerability maps was performed using geographical information system (GIS) technology. The collected data were used also for the validation of the algorithm, by comparing the results with those of the methodology used by the Gruppo Nazionale per la Difesa dai Terremoti (GNDT [Italian National Group for Defense Against Earthquakes]), which is widely adopted in Italy. The results of the research study and the application showed some critical points, related to the poor nature of the information collected and to the reliability of the final results. These issues are analyzed and discussed, proposing a strategy for improving the methodology. 相似文献
In this article, a technique for the renewal of historic building wooden roofs is presented. The solution can be used for the strengthening of existing wooden roofs against excessive lateral thrusts on the peripheral wall or for the recovery of the attics, as it allows removing the existing structural elements, such as possible wooden truss-works of no artistic value. With minor adaptations, the solution can be addressed to enhance the building seismic performance. The technique is minimally impairing on existing buildings and can be applied also in new constructions.
The technique is based on the construction of a thin folded shell, overlaying the existing pitches. Emphasis is given to lightweight folded shells, obtained by overlaying thin plywood panels on the existing roof rafters and planks, without modifying the overall architectural layout.
The technique conceptual design is discussed and a simplified analytical method is proposed, which allows for the clarification of the role of each structural component and can be adopted for the folded shell proportioning and design. The analytical results are validated against numerical results obtained with reference to some case studies. Ultimately, emphasis is given to the detailing, whose correct execution is mandatory for the success of the proposed structural intervention. 相似文献
ABSTRACTGuanhua (official language), Guoyu (national language), and Putonghua (common language) are generally regarded as different names for the same thing in different eras, but from the perspective of cultural history, there are many subtle semantic differences between these three concepts, symbolizing how different social classes and political groups defined their particular experiences, expectations, and efforts to take action. Guoyu, which replaced Guanhua in the late Qing Dynasty, is closely bound up with the construction of modern nationalism. In the 1930s, leftist intellectuals imbued Putonghua with strong proletariat attributes and overtones of indigenous and ethnic equality, wielding it as a tool for critiques against Guoyu. Although Putonghua returned to certain key positions of Guoyu after the mid-1950s, it putatively emphasized the legacy of the leftist language movement, and represented a new political identity. Through these “proper names” for the standard language, it was possible not only to launch a political and social “revolution,” but also to smooth over the historical rifts that this engendered, by repeatedly revising the concepts of “written” and “standard” to form a linear national narrative. 相似文献
ABSTRACTHistorical centers are always composed of masonry building aggregates often designed without respecting seismic design criteria. The current seismic Italian code does not foresee a clear calculation method to predict their static nonlinear behavior. For this reason, in this article the seismic response of structural units into masonry aggregates has been predicted through a simplified modeling approach. The implemented procedure has been calibrated on the results of a numerical model performed by using the Equivalent Frame Method (EFM), implemented within a Finite Element Method (FEM) calculation program, used to investigate a basic building compound representative of the constructive techniques developed in the past decades in the Southern Italy.First, the whole aggregate has been modeled and analyzed in the nonlinear static field in order to evaluate the seismic behavior of both intermediate and head structural units.Later on, the seismic response of these structural units, considered as isolated structures, has been assessed by considering in simplified way their position in the aggregate, as well as the influence of other constructions.Finally, the achieved results on the above single analysis cases have been compared with those deriving from the investigation of the whole building compound, allowing to confirm the effectiveness of the proposed novel analysis procedure. 相似文献
Trace element compositions of raw clay, fired clay and Roman ceramic building material (CBM) from Carpow Roman fortress, Newburgh, Scotland and the city of York, England have been determined through the use of inductively coupled plasma-mass spectrometry (ICPMS). It is confirmed that the firing of clay does not disturb any of the sample’s trace element composition and that trace element protolith identification is an applicable tool for fingerprinting the source of material used in CBM construction. It is also demonstrated through the particular proportions of LREE/HREE; Th/Co; La/Sc; La/Lu; Eu/Sm values on CBM from Carpow that these material were likely manufactured from clay used in the York Roman tile manufacturing industry, therefore suggesting importation. The transport of CBM from York to Carpow provides a useful addition to known examples of the long-distance shipping of CBM. It is postulated that similar analysis to that conducted here could be used to identify important trade networks within the Roman Empire. 相似文献
The cardinal role of tragedy in Morgenthau's theory of international politics has hardly gone unnoticed. Indeed there is now a considerable corpus of literature that established the importance of tragedy as a central concept around which Morgenthau's theory revolved. This paper builds upon this already developed framework and employs tragedy not as an analytical category but as a metaphor employed by Morgenthau to approach the nation-state. It is claimed that the idea of tragedy underpinned his notion of the nation-state inasmuch as it did his view of individual human beings. As such the notion of tragedy informed consistently Morgenthau's analyses of national tragedies that were like the self-defeating nationalism of Germany. It also informed his efforts to avert potential national tragedies from materialising as his attempts to influence US foreign policy demonstrated. It is finally claimed, that far from a descent into despair, Morgenthau's realism signified a conscious effort to go beyond the tragedy of the nation-state. 相似文献