Seismic behavior of two Portuguese adobe buildings: part II —numerical modeling and fragility assessment

Considering the likely unfavorable behavior under seismic action of adobe construction, this article aims at providing a seismic fragility characterization of two adobe Portuguese traditional buildings, using numerical models calibrated over experimental results. The study of such two case-study buildings in the region of Aveiro contributes to the understanding of the seismic fragility of adobe construction in the region in general. The buildings were numerically modeled to estimate their structural behavior under seismic loading using adobe material properties that were calibrated based on the experimental results of a cyclic in-plane test of a full-scale double-Tshaped adobe wall. The method chosen to characterize adobe masonry and model its nonlinear behavior followed a total strain crack-based macro-modeling (TSCM) approach, whereas pushover analysis was carried out to reproduce the pseudo-static experimental test in order to enable a refined calibration of adobe masonry mechanical properties. Fragility functions were then derived, based on the above-mentioned numerical models, using nonlinear static analysis, bringing further insight on the seismic fragility of traditional Portuguese adobe construction.     

Seismic performance of historical vaulted adobe constructions: a numerical case study from Yazd,Iran

Past earthquakes have demonstrated that historical vaulted adobe buildings are highly vulnerable to seismic actions. Hence, it is crucial for such building typologies to be evaluated in terms of seismic capacity. To this end, this article deals with the seismic performance of historical vaulted adobe houses from the city of Yazd, Iran as one of the seismically active areas of the world and possessing a very rich adobe heritage. Thus, and based on a detailed geometrical survey, a representative sample of adobe houses from Yazd was studied using a simplified in-plane analysis based on three geometric indexes. Concerning the out-of-plane behavior, a deeper assessment was conducted by performing a numerical study, where the main influential parameters on the seismic behavior of vaulted adobe buildings were considered. The numerical analyses were carried out by adopting the limit analysis theory implemented in the Block2D software. The results obtained indicate the safe in-plane behavior of most of the houses and the safe out-of-plane response of the sample under gravitational loads. However, the sample out-of-plane safety under earthquake-induced loads seems to be a matter of concern.     

Reinforcement of the 18th Century Buttresses of Maniace Castle: Design and Execution

ABSTRACT

Maniace Castle, built on Ortygia island in Siracusa (Italy) in the first half of the 13th century and hosting a magnificent hypostyle hall (the Salone), a square area covered by 25 cross vaults supported by columns, was severely damaged by the 1693 earthquake and the explosion of the ammunition dump in 1704. The buttresses, built immediately afterward to counteract the thrust of the 10 surviving vaults, did not guarantee adequate seismic safety so that a metal scaffolding was installed in 2001 to prevent an overturning mechanism. This article discusses the design and execution of an external pre-stressing steel system to increase existing buttress strength and the seismic capacity of the Salone, starting with historical and constructional analyses and dealing with both analytical and technical aspects. The monitoring system installed to detect structural response during and after the working execution is shown, along with some of the data acquired so far.     

Building survey forms for heterogeneous urban areas in seismically hazardous zones. Application to the historical center of Valparaíso,Chile

ABSTRACT

Building survey is an essential data-collection procedure to feed large-scale seismic vulnerability assessment. The available strategies usually consider survey forms to gather information about the urban buildings. The application of the available survey forms poses important challenges for the case of the heterogeneous urban centers including different structural typologies. This work proposes four specific survey forms for traditional structural typologies constructed with masonry, reinforced concrete, mixed steel-reinforced concrete, and timber. The proposed forms request essential information on the parameters necessary for seismic vulnerability assessment, by evaluating the lateral-load resistant system, regularity, condition of conservation, and existing damages. The survey forms were applied to the study of 111 buildings of the historical center of Valparaíso, Chile. The proposed methodology was complemented with the use of Geographic Information Systems to obtain a complete database with the structural characterization of the most representative typologies for future works of large-scale seismic vulnerability assessment.     

The Determinants of Political Cleavages in Jordan,Tunisia, and Yemen: An Analysis of Political Attitudes Structure in the Arab World

This article investigates the determinants of political cleavages composing the structure of political attitudes in Jordan, Tunisia, and Yemen following the Arab Spring. Further, it tests whether political cleavages carry predictive weight on ordinary citizens’ electoral choices in general elections. Using the Sixth Wave of the World Values Survey, discriminant analysis was conducted to generate the dimensionality, type, and structure of political attitudes in the three nations. Findings suggest that the structure of political attitudes in Jordan, Tunisia, and Yemen is multidimensional: the Islamic‐Secular division, a conflict along economic policy visions and an emerging divisive dimension concerning political reform. Evidence indicates that political cleavages do not possess significant predictive power in determining voters’ choice at elections booths. This research also points to the significance of social transformation processes such as modernization and globalization in causing a shift in values among ordinary citizens in the Arab World. This research argues that in countries where the effects of modernization and globalization are higher, a weakening of the Islamic‐Secular division is witnessed. This research is important since it paves the way for further empirical analysis on political ideology in the Middle East. It shatters conjectures concluding that Arab polities are only divided by a single hierarchical dimension: Islamic‐Secular. It contributes to comparative research on the dimensionality of political ideology by showing that the Arab World is similar to the industrialized world in the dimensionality, nature, and structuration of political ideology.     

Ulama in Islamic Law‐Making and Adjudication in Contemporary Egypt

The article examines the legislative and judicial tasks of Islamic jurists and how they carried it out in constitutional or general legal structure. While the Pakistani experiment was inspired by the Iranian model of jurists' involvement in legislatures, Egypt took a different path by not recognizing any official role for Islamic jurists with ambiguous recognition of Islamic jurisprudence. The legislative role could take the form of incorporating Islamic jurists into the legislature, establishing a committee partially made up of Islamic jurists, or handing over some legislative task to an Islamic jurisprudential institution. Despite the fact that Islamization was intended to respond to the people's requests, it employed autocratic and authoritarian mechanisms. The project attempted to replace the typical class of socially recognized jurists with appointed committees entrusted with Islamic codification. The experiment was challenged for its operation and its Islamicity but never introduced Shari'a courts or Islamic clerical legislation.     

Electrical Resistivity Tomography with Angular Separation for Characterization of Burial Mounds in Southern China

The study aims at providing the spatial distribution and potential structure of the burial mounds at the Sifangling site, Hepu Han Tombs, in southern China. We implemented an electrical resistivity tomography (ERT) technique to obtain high‐resolution imaging of archaeological targets, considering the challenging environment and the depth of the burials. Three ERT profiles were tested above a small ancient mound previously detected by exhaustive archaeological drillings, following which 18 ERT profiles with angular separation were performed on the largest mound at the test site, without any a priori archaeological evidence below the surface. Then, a series of two‐dimensional (2D) profiles were combined as a ‘pseudo‐3D’ volume, which allowed a detailed characterization of the burial mound, and iso‐resistivity surfaces were also calculated to emphasize the location and spatial extent of the target. The results gave an effective identification of the funeral chamber and its structural details, and allowed detailed pre‐excavation planning.     

South–South Cooperation and the Geographies of Latin America–Caribbean Integration and Development: A Socio‐Spatial Approach

Structured around the case of South–South cooperation in the construction of “complementary economic zones” among the member states of the ALBA‐TCP, Petrocaribe, CARICOM and MERCOSUR, this article argues for a socio‐spatial approach to the study of the Latin America–Caribbean integration and development. Two interrelated arguments are developed: first, in contrast to methodologically nationalist approaches, which typically view the regionalisms that are to form the complementary economic zones as ideologically separate, incompatible or conflicting projects, a socio‐spatial approach in conjunction with a South–South cooperation analytical lens explains their commonality and, subsequently, their interrelatedness and convergence. Second, while this South–South cooperation space is not per se non‐capitalist, a socio‐spatial analysis also facilitates “seeing” the production of a socialist “counter‐space” within this South–South cooperation structure.     

The role of ‘diplomatic lobbying’ in shaping US foreign policy and its effects on the Australia–US relationship

Lobbying as a form of engagement with the US Congress has long been studied from a domestic perspective. Lobbying, however, is not a practice confined to actors with domestic interests—it is also used as a form of diplomacy by many foreign governments, including Australia. Diplomatic lobbying is a vastly understudied phenomenon and its impact on US foreign relations is rarely examined. Unlike most Westminster-based democracies, the USA has two branches directly involved with foreign affairs—the Executive and Congress—each of which is important for different aspects of foreign policy development. Australia has found lobbying the US Congress to be a powerful tool for diplomatic engagement. This article looks at the role of the US Congress in foreign affairs, the effects of lobbying, and the ways in which diplomats engage with and lobby Congress. Australia’s specific lobbying efforts and their effects on the US–Australia relationship are then examined.     

Déni,connaissance, responsabilité: le régime stalinien et la grande famine ukrainienne de 1932–3

The great 1932–3 famine in Ukraine and Kuban, considered a major disaster in twentieth-century European history, is starting to be recognised as the opening act of a terrible cycle of violence against the populations of a vast area in the heart of Europe, perpetrated by the two great totalitarian regimes that were Nazism and Stalinism. As James Mace, the pioneer in studying this famine, has written, the Ukrainian famine was a ‘man-made famine’. It was the consequence of an extreme political violence – the forced collectivisation of rural areas. The Stalinist regime exhibited a total indifference to human suffering. Famine was just ‘collateral damage’ of modernisation introduced by collectivisation. Beyond the total denial of famine by Stalinist authorities, this article raises the double question of its knowledge and its responsibility, using new sources. How far can the chain of decision-making that led to the famine and its aggravation be reconstructed? What did the executives of the Party know about what was happening in starving rural areas? Which argumentation and which explanatory strategy were they developing in their correspondence to deal with the reality they were denying?