Experimental analysis of rubble stone masonry walls strengthened by transverse confinement under compression and compression-shear loadings

Stone masonry walls of ancient buildings have reasonable resistance to vertical loads but lower resistance to shear forces and reduced tensile strength. However, to achieve such compressive strength the masonry must not disaggregate when subjected to loading. This can be achieved if during the construction of the walls larger stones, usually referred as “through stones”, are used, spanning the thickness of the wall, making it possible to improve the transverse confinement of the masonry. For rehabilitation projects and structural reinforcement of such buildings, the transverse confinement can be achieved by fixing steel elements perpendicular to the wall. This confinement technique is often part of a more comprehensive rehabilitation solution, which includes the application of mortar or concrete reinforced layers applied to the wall surface.

This article presents results of an experimental research on material properties and mechanical characterisation of stone masonry specimens strengthened by two transverse confinement solutions (independent steel reinforcing rods and continuous steel ribbons wrapping the specimen). Specimens were tested under compression and compression and shear loadings.

This experimental work is part of a major research project to study the mechanical behavior of URM and strengthened walls, and the characteristics of the building materials of such specimens.     

Earthquake Risk Scenarios in Urban Areas: A Review with Applications to the Ciutat Vella District in Barcelona,Spain

ABSTRACT

The vulnerability index and capacity spectrum-based methods used to assess the expected physical damage in dwellings are revisited, and their main advantages and shortcomings are analyzed and discussed. Then, a vulnerability index-based method is used to assess the expected damage in the oldest district of Barcelona, Spain. The risk analysis is performed for earthquake scenarios defined by macroseismic intensities of V, V-VI, VI, VI-VII, and VII to design seismic emergency plans. According to the Spanish Seismic Code, the basic peak ground acceleration for a 475-year return period is 0.04 g, which corresponds to an intensity of VI. Thus, the expected physical damage is quantified and its impact on population and other quantities, such as debris and economic cost, are studied. In spite of the low-to-moderate seismic hazard in Barcelona, the results show that the risk is high, due to the high exposure and vulnerability of the built environment.     

Photography,public pedagogy and the politics of place-making in post-industrial areas

This paper discusses the way in which public photographic depictions of places and place-based communities contribute to the construction of local identity and community building. Being public and visualised statements about what a place and the people living there are and what they are not, photographs incite public debate about place and community. The paper discusses two interventions, one in Ghent, Belgium, involving professional photographers from outside the neighbourhood, and one in Bonnybridge, Scotland, involving amateur photography by local residents. Both are attempts by community workers to encourage citizens to discuss alternative realities of themselves, their neighbours and their neighbourhood. Starting from theories of place-making and public pedagogy, we reveal how both nonetheless exemplify very different strategies to democratise community-building processes.     

The importance of national parks to nation‐building: Support for the National Parks Act (2000) in the Scottish Parliament

In 2000 Scotland finally introduced legislation to enable the establishment of its first national parks, 50 years after England and Wales. This paper considers interpretations of this event and reflects on the importance of national parks to nation‐building. Grounded within a framework which holds landscape to be an important signifier of national identity, these issues are explored through a case study of the Cairngorms National Park. This study found that it was the ‘nation‐building’ agenda which was a key factor in securing the unanimous support of the Scottish Parliament for the National Parks Act (2000) but that this agenda hid competing definitions of what shape Scotland's landscapes should be. This suggests that the National Parks Act appealed as a form of institutional, as opposed to cultural, nation‐building.     

Like Moses Who Led His People to the Promised Land: Nation‐ and State‐Building in Bougainville

This article focuses on indigenous religious beliefs and practices in relation to nationalism and state‐building in conflict and post‐conflict Bougainville. Since the early seventies, people of the island of Bougainville have sought to secede from Papua New Guinea and constitute a separate sovereign state. The almost ten year long secessionist struggle between the Bougainville Revolutionary Army (BRA) and the PNG Defence Force (PNGDF) that eventuated in 1988, destroyed nearly all infrastructure, socio‐economic services, and the functions of the PNG state on the island. At the same time, the crisis also brought about the establishment of new local governments, such as ‘The Bougainville Interim Government’, as well as a new Nation: the Independent Republic, later called the Kingdom of Me'ekamui, ruled by BRA leader Francis Ona. This article explores the creation of the Me'ekamui Nation and analyses the religious underpinnings of nation‐ and state‐building in Bougainville, focusing on the performances and normative frameworks used in the endeavor to become a sovereign state.     

Attempts at an Arab‐Jewish agreement in Palestine during the thirties

The article argues that a central aspect of Israeli-Polish relations before 1967 was their tripartite nature, involving the two states and Polish Jewry. The main goal of Israeli diplomacy in Poland, to which it subordinated a variety of interests, even those that were central to Israel's foreign policy, was the immigration to Israel of Polish Jewry. The three elements of the triangular relations (Israel, Poland, and Polish Jewry) influenced one another through their policy and behavior, monitored each other, interpreted each other's actions, and reacted accordingly. The aliyah from Poland engendered a new dynamic in the relations. Israel was able to implement its nation-building policy through the immigration of a desired element, and the Polish authorities, by allowing emigration of an unassimilable ethnonational minority, homogenized the nationalizing Polish state. After the massive emigration of the Jews, another element connecting and reshaping the three sides of the triangle emerged: the competition to represent the memory of Polish Jewry, conceived, too, as an instrument in the nation-building process of both states.     

THREE DIMENSIONAL NONLINEAR BUILDING POUNDING WITH FRICTION DURING EARTHQUAKES

The three dimensional pounding phenomenon of two adjacent buildings during earthquakes with aligned rigid horizontal diaphragms is investigated for the linear and nonlinear structural response. The developed formulation takes into account three dimensional dynamic contact conditions for the velocities and accelerations based on the impulse-momentum relationship, using the coefficient of restitution e and the ratio μ, of tangential to normal impulses, which corresponds to the coefficient of friction under certain conditions. The contact points are determined geometrically from the displacements of the diaphragms' centre of mass. The results of the proposed formulation are compared with those obtained with the Lagrange multipliers approach. Test results are performed for two sets of multi-storey adjacent buildings subjected to real earth-quake motions with elastic and inelastic structural response.     

Faces and Facets of the Kantosou Kou Xat – The Lao “National Liberation Struggle” in State Commemoration and Historiography

Contemporary Lao history and politics are characterised by an ambivalent ideological hybrid of cultural heritage protection and revolutionary glorification. Even though Buddhism and its related ritual practices appear to have regained considerable ground in official nation-building strategies, the “national liberation struggle” (Lao: kantosou kou xat) continues to constitute a key element of the national discourse as represented by official historiography and state iconography. In fact, the revival of royal-Buddhist images is linked to the “struggle”, since past kings of the Lao Buddhist kingdom of Lane Xang are at present re-interpreted as proto-national patriotic fighters on behalf of the so-called “Lao multi-ethnic people”.

This paper argues that the different aspects of official Lao history and memory politics are directed towards the twin goals of ideological nation building and the self-legitimisation of the present regime. Heroic kings such as Anouvong and Setthathilat are highlighted as ancestors of Kaysone Phomvihane and other revolutionaries of the twentieth century within a genealogy of national heroes. Besides discussing present historiographical narratives of the Lao “struggle”, this paper explores material and performative aspects of state commemoration, in particular with regard to national lieux de mémoire and public events.     

Conservation of archaeological mosaic pavements by means of reburial

Abstract

In a burial environment ancient mosaic pavements are subject to a variety of mechanisms of deterioration, both physical and chemical. However, many pavements have survived, sometimes in exceptional condition. Additionally, some mosaics that have been discovered in recent times and reburied as a means of protection have also been well preserved. This indicates that reburial can be an effective means of preventive conservation and a viable response to the need for conservation of exposed mosaics on many archaeological sites. For reburial to be successful, risks to the mosaic must be accurately appraised and the design of the reburial must be well specified, following a rigorous conservation methodology.     

Seeing Green in San Francisco: City as Resource Frontier

The early 21st century witnessed a boom in green building in San Francisco and similar cities. Major downtown property owners and investors retrofitted office towers, commissioned green certification, and critically, explored how greening might pay. Greening initiatives transcend corporate social responsibility: they represent a new attempt to enclose and speculate upon “green” value within the second nature of cities. However, this unconventional resource discovery requires a highly partial view of buildings’ socio‐natural entanglements in and beyond the city. I illuminate these efforts and their obscurities by exploring the experience of an exemplary green building in San Francisco, an office tower that has successively served as a headquarters organizing a vast resource periphery in the American West, a symbol and driver in the transformation of the city's own second nature, a financial “resource” in its own right, and most recently, an asset in an emerging global market for green property.