Investigation Techniques for the Seismic Response Assessment of Buildings Located in Historical Centers

ABSTRACT

It is an acknowledged fact that historical centers, given its significance from the cultural and architectural viewpoint, bring further challenges in terms of maintenance planning, survey, and safety assessment. The preparation of an adequate investigation plan and the extent of data to be collected is highly reliant on many aspects, such as the category of the architectonic asset, the importance of the heritage site, or the resources available, for example. In what regards the seismic response assessment of urban cultural heritage assets located in historical centers, the amount and detail of data also depend on this article, scale of assessment, and current state of conservation and occupation. Within this framework, this article provides an overview of the state of the art of investigation techniques currently used in survey operations, which are currently available for improving the knowledge level of urban cultural heritage assets within historical centers, as a supporting tool for the seismic response assessment of such singular assets. Finally, acknowledging the lack of accuracy when evaluating the seismic response of an asset enclosed in aggregate as an isolated structure, this article also focuses on the identification of the main particularities inherent to buildings enclosed in aggregate.     

Protocol,Potentials, and Limitations of Ancient Teeth 3D Printing

Bioarchaeological analyses of teeth rely traditionally on noninvasive methods that reveal essential information about past individuals and populations. Methodological developments have revolutionized the discipline, but their application is commonly invasive and destructive. The resulting loss of material and information can be buffered through 3D technology applications. Although useful, it is essential that we carefully assess the reliability of these methods, in order to understand what data are preserved and which ones are lost through their application. This study offers a protocol for the implementation of 3D technology in the fabrication of ancient teeth analogs. Analog accuracy was assessed by comparing metric and non-metric traits between the originals and their respective analogs. Results showed that metric traits preserved well, but the preservation of non-metric traits was partially hindered.     

Polycentrism as a Multi-Scalar Relationship Between Urban and Rural Areas: The Case of Portugal

This article introduces a reflective analysis of polycentrism. Since the 1990s, polycentrism has provided the foundation for countless spatial planning policies in Europe. Most studies highlight the importance of cities and towns as the principal nodes for regional development. This article discusses whether polycentrism is the best planning solution for managing the imbalances and relationships between urban and rural areas. Empirically, it will focus on the polycentric discourse that has recently gained strength in Portugal, by evaluating the national spatial planning policy programme and its consequences for regional development. It will make a comparative analysis between the national spatial development perspective proposed by the programme and certain sociological findings that characterized the rural areas caught out between urbanization and marginalization. This will be illustrated with research on the Alentejo region, one of the largest rural areas in Portugal.     

Seismic Vulnerability of an Inventory of Overturning Objects

A methodology is presented for assessing the probability of overturning under the action of ground motions of given intensities, and the expected values and standard deviations of damage produced by overturning of objects in a group or inventory exposed to the same seismic event. We apply this methodology to one example of the typical contents located on the base (i.e., free-field) of a middle-class house or apartment. A detailed inventory was gathered, and recent well-recorded accelerograms at the site were used to compute the rocking response of every object. Vulnerability functions for the whole inventory computed at four different sites in terms of epicentral distance and site effects show large differences between them.     

A Roman Skeleton with Possible Treponematosis in the North‐East of the Iberian Peninsula: A Morphological and Radiological Study

The main goal of this paper is to describe and discuss pathological lesions observed in a Roman skeleton (between 2^nd and 3^rd century AD) from the north‐east region of the Iberian Peninsula (St Nicasi 18–24 site. Gavà, Barcelona), which may be compatible with treponematosis. Most of the skeleton, with the exception of the neurocranium, was recovered. Only the left tibia was affected, whereas the rest of the recovered skeletal remains were unaffected. Macroscopic examination revealed a male individual between 25 and 30 years of age at death with a sabre‐shaped left tibia. The proximal half of the diaphysis was pitted and the bone overall enlarged. The surface of the tibia showed occasional vascular impressions where, in some instances, small raised plaques of new bone appeared to bridge over them, specifically in the most affected area of the proximal half of the tibia. No destructive lesions were observed. Radiographic examination and gross inspection at the cross section of the tibia showed encroachment into the medullary cavity of coarse cancellous bone and cancellization of the cortex. The observed lesions indicate that the tibia was affected by a chronic infectious disease. Differential diagnoses were considered, and these included other infectious diseases, fibrous dysplasia, Paget's disease, chronic varicose ulcers affecting bone and trauma, with the conclusion that the disease affecting the tibia could have been treponematosis. This could be significant in the history of the treponematoses being one of the oldest examples of treponematosis in pre‐Columbian Europe. Copyright © 2011 John Wiley & Sons, Ltd.     

Identifying wine and oil production: analysis of residues from Roman and Late Antique plastered vats

The production of oil and wine was an important aspect of the ancient Mediterranean economy. Among the material remains related to the production of these substances, installations used for their production provide evidence that is still unexploited. Although archaeological studies have been carried out on these installations, problems can arise in the identification of their function, as wine and oil production structures can be similar and the archaeological traces insufficient to establish which substance was produced.     

Educating geographers in Spain: geography teaching renewal by implementing the European Higher Education Area

This article discusses the current state of the geography discipline in Spanish Universities after putting into action the European Higher Education Area. After decades of geography teaching, following theoretical and expository discourse models, the so-called Bologna Process has been a great opportunity to reflect what geography should be taught, how geography should be taught and why geography should be taught. Aspects such as competences, employability, learning methodologies, assessment, Geographical Information Systems domain have been incorporated into the renewal of geography teaching in Spanish higher education, which has contributed to the strengthening of geography in a context of geospatial technologies revolution and public awareness of spatial challenges.     

Ductility-Equivalent Viscous Damping Relationships for Beam-to-Column Partial-Strength Steel Joints

This paper seeks to contribute to the development and improvement of displacement-based design procedures, proposing improved ductility-equivalent viscous damping relationships for steel moment-resisting framed structures with dissipative beam-to-column partial-strength joints. These relationships can be used directly in procedures like the Direct Displacement-Based Seismic Design (DDBD) that uses effective stiffness, ductility-equivalent viscous damping relationships, and period-displacement relationships in a performance-based design approach. To this end, a finite element model of a steel beam-to-column sub-assemblage, characterized by an extended end-plate, is developed in ABAQUS. The model, which is validated against monotonic and cyclic experimental data obtained in previous research, is employed to carry out non-linear time-history (NLTH) analyses, using real records scaled to target several levels of ductility demand. A procedure is then proposed and applied to determine the ductility-equivalent viscous damping relationships of the sub-assemblages. The equivalent linearization technique is applied to the non-linear responses obtained in the NLTH analyses, using an elastic single degree of freedom structure and the elastic displacement spectra. The influence of joints mechanisms and of the dynamic characteristics of the structure in the equivalent viscous damping is investigated, and an expression for ductility-equivalent viscous damping is proposed. The proposed expression represents a clear improvement in relation to the existing expressions available in literature.     

On Language, Culture, and Social Action

This article outlines the theoretical developments experienced in historical studies over the last two decades. As a consequence of the growing critical reconsideration of some of the main theoretical assumptions underlying historical explanation of individuals' meaningful actions, a new theory of society has taken shape among historians during this time. By emphasizing the empirical and analytical distinction between language as a pattern of meanings and language as a means of communication, a significant group of historians has thoroughly recast the conventional notions of society, experience, interests, culture, and identity, and has developed a new concept of social action. Thus, historiographical debate seems to have started to transcend, for the first time, the longstanding and increasingly futile contest or dilemma between objectivism and subjectivism, between materialism and culturalism, between social and intentional explanation, or between social constraints and human agency. The groundwork has now been laid for an alternative to the declining paradigm of social history that does not entail a revisionist return (be it partial or complete) to idealist history but opens a quite different path.     

Modelling Cooperation Mechanisms: Some Conceptual Issues

Several evolutionary mechanisms have been proposed to explain how natural selection leads to cooperation between competing individuals. Social dilemmas modelled with the aid of game theory capture the essence of this problem, and computer simulation is usually the technique used to test and formalise those explanatory mechanisms. However, scarce attention has been paid to what the notion of ‘mechanisms’ means and involves in the literature. Also, the key issue about when a computer simulation provides a good explanation tends to be ignored. In this article, we tackle these two drawbacks in the literature by calling attention to the implications of the notion of ‘social mechanism’ along different conceptual dimensions, such as ontological status, regularity, transparency, intelligibility, and reduction. We also claim that computer simulation, and specially agent-based modelling, provides a plausible explanation to social cooperation only if it satisfies some criteria of empirical adequacy instead of just being capable of generating cooperation in a virtual system. Finally, we relate these issues to five evolutionary mechanisms that explain the evolution of cooperation. We review and briefly describe the literature on these mechanisms, and we explain their most important features, how they are to be considered along the conceptual dimensions used to describe the notion of mechanism, what is the empirical and computational evidence to support them, and which are the shortcomings that each of them has as explanatory hypotheses for the evolution of cooperation.