Medieval Britain in 1962 and 1963

Abstract

The Hammerbeam roof over the great hall of Edinburgh Castle is one of only two high-status roofs surviving on medieval secular buildings in Scotland. In 1999, Historic Scotland recorded the roof structure in advance of cleaning work. Detailed examination of the existing structure and surviving documentation confirms that much of the original timberwork survives, despite later use as a barrack, then as a military hospital, which resulted in many alterations to the structure, including subdivision of its interior. In 1887–92, the building underwent an extensive restoration by the Edinburgh architect Hippolyte Blanc. Its dating has been a matter of dispute among architectural historians, particularly with reference to its stone corbels. Our dendrochronological analysis indicates a construction date of 1509/10: the roof of the great hall of Edinburgh Castle is, therefore, a rare example in Scotland of major timberwork from the reign of James IV (1488–1513). Much of the original carved stone corbel work survives, despite restoration and partial replacement by Blanc, and the iconography of these is contemporary with the roof construction. The decoration of the corbels is therefore among the earliest use of Renaissance ornament in Britain. With the splendour of the roof, they are a small part of the repertoire used to present James IV in the magnificence of a contemporary European monarch.     

Analysis of the collapse mechanisms of medieval churches struck by the 2016 Umbrian earthquake

The 2016 Umbrian earthquake caused the collapse of several medieval churches, while it was noted that ordinary buildings only reported moderate or little damage. Researchers and technicians are looking to these religious constructions with the aim of understanding their structural behavior under seismic action. Depending on the direction of the seismic action, the typical collapse mode was the overturning of the side walls or of the church façade. This often produced the collapse of the roof structure. In many situations, the overturning was facilitated by a weak connection between the load-bearing walls. In this article, the collapse modes of three mediaeval churches are investigated. The article goes into some detail about what considerations are relevant when analyzing a historic masonry construction. The churches object of this study are located in Campi, a hamlet of Norcia, Italy. Between 2000 and 2004, a research team from the Technical University of Milan in collaboration with the Italian Ministry of Culture carried out an extensive investigation on the historic buildings of Campi, providing interesting data about the maintenance level and a summary of the structural state of the churches. These data were used in this article for a critical analysis of the causes of collapse, performed in combination with numerical simulations of the global behavior and local instability.     

The Dynamic Behavior of the Basilica of San Francesco in Assisi Using Simplified Analytical Models

The Basilica of San Francesco in Assisi endured stronger earthquakes for centuries before 1997 earthquake, which generated the collapse of the two vaults. Experts blame as possible reasons of collapse the damage cumulated from previous earthquakes and/or the retrofitting made to the structure over its lifetime. This article presents the history of the retrofit interventions of the Basilica through the centuries, focusing mainly on the roof, which has been subjected to three major restorations through its life. It is shown using simple analytical models that the cumulative effects of the changes made to the roof of the Basilica affected the structure’s dynamic behavior in a negative manner, increasing the seismic loads on the existing structural members. In particular, the numerical results show that the 1958 roof intervention has stiffened the structure, redistributing the seismic loads on the façade and the transept. This overload might explain the collapse of the two Gothic vaults during 1997 earthquake.     

云冈石窟第3窟后室顶板加固治理与监测

云冈石窟第3窟是云冈石窟开凿规模最大的洞窟,在开凿过程中戛然而止。特殊的洞窟结构加上千年的自然风化催生了多种病害,其中后室顶板崩塌最为严重。为此,采用岩石测试、地质雷达和钻孔勘查等多种方法,查明了顶板岩石性质和破坏形式。在钢结构支护的前提下,利用环氧树脂裂隙注浆结合玻璃纤维锚杆牵拉的方法对顶板进行加固。对施工完成后121 d的裂隙、倾斜和应力监测数据进行分析,表明加固效果良好,具有广泛的借鉴意义。     

Where are the roofs? A geo-ethnoarchaeological study of mud brick structures and their collapse processes,focusing on the identification of roofs

Unlike floors that have been given a lot of attention in archaeological research, the study of roofs is long neglected. Here, we present a study of modern abandoned and burnt mud brick structures, conducted in southern Israel and northern Greece. Using macroscopic observations and interviews together with micromorphology, mineralogical, phytolith, and phosphate analyses, we show that roofs should be sought in close proximity to floors. We show that roofs practically seal activity remains on floors; thus, the importance of identifying roofs in the archaeological record lies mainly with the ability to estimate the integrity of floors and floor assemblages. While human behavior and maintenance practices are major factors in the deposition of primary activity remains on floors, the timing of roof collapse determines how well activity remains will be preserved. In addition, we show that the roof plays a major role in the degradation process of mud structures as wall degradation is enhanced after the collapse of the roof resulting in accumulation of mud brick degradation material on top of the collapsed roof. As most roofs in antiquity seem to have been composed of degradable vegetal materials, we found that not only they leave little evidence for their presence, but they also mix with vegetal activity remains. We therefore use the accumulation of mud brick debris as an indicator for the location of degraded roofs. Using microstratigraphy for the identification of both floors and roofs is significant in order to locate activity remains in the archaeological sedimentary sequence and to evaluate their state of preservation.     

单檐歇山式木构古建抵抗极端烈度地震试验调查研究

为更好地保护我国古建筑,基于《单檐歇山式古建筑抗震性能振动台试验》的相关成果,研究了强震作用下我国明清官式木构古建的抗震性能,制作了与该论文相同的试验模型,进行了振动台试验。通过对模型输入烈度逐渐增强的1940年El-centro波,并考虑地震波为水平双向作用,分析了强震作用下不同构造的试验现象,开展了详细的震后调查,获得了不同构造在强震作用下的抗震性能和震害机制。结果表明:强震作用下,我国明清官式木构古建的振动形式表现为柱架、斗拱、梁架及屋顶的近似同步往复摇摆;主要震害包括柱底偏移、榫卯节点开裂、拔榫、斗拱偏移及错位、额枋-垫板分离、墙体倒塌等,但承重木构架受损不严重,结构未产生倒塌。其良好抗震性能的原因与古建筑的构造特征密切相关。     

Reconciling State and Society? The Practice of the Common Good in the Partnership of Bishop David Sheppard and Archbishop Derek Worlock

The dynamic partnership between Anglican Bishop, David Sheppard, and his Roman Catholic counterpart, Derek Worlock, was a significant force in Liverpool during the 1980s, both ecumenically and politically. However, despite their “cult status” within the city, their national and international importance has yet to be explored. The 1981 Toxteth Riots are used as a case study through which to read their exceptional and transformative relationship. This article will discuss how their partnership became emblematic of changing church–state relationships from both Anglican and Roman Catholic perspectives, and how they each, in turn, went on to shape their churches’ dialogue with the government. The article explores the nature of their collaboration and the theological and doctrinal ideas that informed it, before going on to discuss the 1981 Riots in detail. It will demonstrate that the Sheppard–Worlock model of ecumenism put the Gospel, and in particular its focus upon the poor and marginalised, at the heart of their partnership. It will conclude that they sought the Common Good for society and believed that reconciliation was the key to the achievement of this goal.     

Debunking the Myth of Localized Agglomerations: The Development of a Regionalized Service Economy in South-East England

The central argument of this paper is that localized clusters of economic activity, or 'agglomerations', have been overemphasized in economic geography since the mid-1980s. In particular, such analyses are too manufacturing-biased, and place too much weight on the importance of local supply, market and partnership linkages. We will re-emphasize the service-based nature of growth in the core region of the UK economy, and will explore how a broad band of producer service activity is emerging in the Western Arc, owing largely to common locational logics, including back-office decentralization and the new firm-formation process. Such growth is both stimulated and supported by the high demand levels of the regional economy, but evidence suggests that the linkages of such firms extend well beyond the 'local', to cover at least the 'Greater South-East'. Furthermore, the international element in service growth needs to be recognized, as highlighted by the concentration of US foreign direct investment in the software industry along the M4 corridor. When areas outside the South-East are considered (such as Edinburgh, Tyne and Wear, Cheshire), the evidence appears to support Allen's (1992) notion of a 'regionalized mode of service growth' in the South-East.     

Debunking the Myth of Localized Agglomerations: The Development of a Regionalized Service Economy in South-East England

The central argument of this paper is that localized clusters of economic activity, or 'agglomerations', have been overemphasized in economic geography since the mid-1980s. In particular, such analyses are too manufacturing-biased, and place too much weight on the importance of local supply, market and partnership linkages. We will re-emphasize the service-based nature of growth in the core region of the UK economy, and will explore how a broad band of producer service activity is emerging in the Western Arc, owing largely to common locational logics, including back-office decentralization and the new firm-formation process. Such growth is both stimulated and supported by the high demand levels of the regional economy, but evidence suggests that the linkages of such firms extend well beyond the 'local', to cover at least the 'Greater South-East'. Furthermore, the international element in service growth needs to be recognized, as highlighted by the concentration of US foreign direct investment in the software industry along the M4 corridor. When areas outside the South-East are considered (such as Edinburgh, Tyne and Wear, Cheshire), the evidence appears to support Allen's (1992) notion of a 'regionalized mode of service growth' in the South-East.     

Discrete Element Analysis of the Minimum Thickness of Oval Masonry Domes

This study focuses on domes the ground plan of which, instead of the more common circular shape, is an oval, and aims at finding the minimally necessary uniform wall thickness for domes of different geometries loaded by their selfweight. The discrete element code 3DEC was applied because of its capability of simulating the collapse mechanisms of masonry structures. Results on the minimal wall thickness, corresponding masonry volume and failure mechanisms for different dome geometries are presented. Three ranges of the friction coefficient were found. For very low frictional resistance collapse happens with pure frictional sliding, for any arbitrarily large wall thickness. In the range of relatively high (i.e., realistic) friction coefficients the structure collapses without any sliding if the wall is not sufficiently thick, and in the observed range of the friction coefficient the necessary wall thickness is nearly insensitive to its value (collapse initiates with hinging cracks only). Between the two domains an intermediate behavior was found: combined cracking and sliding collapse modes occur for insufficient wall thickness, and the minimal thickness strongly depends on the friction coefficient. The critical and transitional friction coefficients separating the failure modes were determined for different eccentricities of the groundplan.     

A Late‐18th‐Century Merchantman Wrecked in the South Edinburgh Channel,Thames Estuary,England

The South Edinburgh Channel wreck consists of the remains of a large, unidentified armed merchant ship whose cargo included a rare consignment of Swedish plate‐money, among other goods. The wreck was lost some time in the later part of the 18th century in the Thames Estuary and was uncovered briefly by natural means between 1972 and 1977. This allowed archaeological investigation, which was undertaken in very poor environmental conditions in the early days of maritime archaeology in the UK.     

Assessing community participation in local economic development — lessons for the new urban policy

Urban policy in Britain has long been characterised by circumscribed and fluctuating institutional structures of community involvement. From the Community Development Programmes of the early 1970s to the assertive neo-liberalism of the 1980s and back to the partnership based politics of the 1990s, community involvement in the construction and delivery of urban policy has been a critical theme. The new administration, with its emphasis on the ‘stakeholder’ society seems set to continue the trends of the 1990s by promoting the concept of partnership as something of a panacea for the difficulties and exclusionary politics that have dogged urban policy programmes. Consequently, a vital area of study into the next century concerns the form that local democratic structures will take and the relative levels and distribution of risk and reward that regeneration schemes create for different sections of local communities.Drawing on material from Cardiff, this paper examines the construction of local political relations in the new urban governance and addresses the issue of community involvement in the politics of local economic regeneration. In particular, it focuses on a small business association which emerged in the wake of the major regeneration programmes being undertaken by the Cardiff Bay Development Corporation (CBDC), a powerful quango established by central government in the late 1980s. The study demonstrates how the association, which consisted of local businesses, tried to influence the local regeneration programmes and how its ‘pro-growth’ stance was actively used by the CBDC to legitimate its own policies in the face of wider criticisms from local residential groups. The paper looks at the difficulties of constructing local community participation and concludes that voluntarist, top-down partnership structures in existing policy may only serve to legitimate and implement policy decisions taken by powerful non locally-accountable regeneration agencies.     

Geographical Imaginations and Spaces of Political Engagement: Examples from the Indian Alliance

This paper is concerned with the various ways in which geographical imaginations are inflected in politics. It draws on examples from a three‐way partnership of civil society organisations based in Mumbai, India. This movement seeks to reconfigure the governance of anti‐poverty strategies by placing "poor people" at the centre of its activities. The partnership, which refers to itself as the Alliance , is involved in the mobilisation and creation of a range of alternative geographical imaginations that are inflected in the production of new spaces of political engagement. By exploring two of the Alliance's strategies—enumerations and exhibitions—I will illustrate some of the ways in which these alternative geographical imaginations feature in the creation of spaces of political engagement. These strategies involve the practical demonstration of the capacities of the poor to donors and states, and reflect a particular conception of the poor and social change.
The spaces of political engagement formed in part through the Alliance's work depend significantly on a commitment to non‐party alignment, an approach that has received criticism from NGOs and commentators involved with urban poverty. I will argue that the Alliance represents a broad development alternative—rather than a form of alternative development—which nonetheless is making substantial progress in the politics of citizenship in Mumbai.     

汶川地震导致的古建筑震害

为了解汶川地震造成的古建筑震害及对古建筑的保护,根据古建筑震害资料,通过归纳方法,获得了古建筑不同的震害症状：对木结构而言,主要有地基破坏、柱底侧移、柱身倾斜、节点拔榫、装修开裂、梁架歪闪、瓦件掉落、填充墙破坏等;而砖石及砖木结构由于承重材料的抗拉、压、剪强度相对较差,容易产生倒塌等严重震害。在此基础上,通过勘查分析方法,获得了古建筑产生震害的主要原因：地震力过大、古建筑缺乏及时保养与加固、施工原因及砖石材料本身强度差的原因等。针对不同的震害原因,提出了相应的抗震加固建议。在上述工作基础上,得出如下结论：为提高古建筑的抗震性能,应加强对古建筑的维护与加固,及时清除各种隐患,将地震产生的破坏减小到最轻的程度。     

Seismic Vulnerability Assessment of Modular Steel Buildings

Contemporary seismic design is based on dissipating earthquake energy through significant inelastic deformations. This study aims at developing an understanding of the inelastic behavior of braced frames of modular steel buildings (MSBs) and assessing their seismic demands and capacities. Incremental dynamic analysis is performed on typical MSB frames. The analysis accounts for their unique detailing requirements. Maximum inter-story drift and peak global roof drift were adopted as critical response parameters. The study revealed significant global seismic capacity and a satisfactory performance at design intensity levels. High concentration of inelasticity due to limited redistribution of internal forces was observed.     

Borderland spaces for learning partnership: opportunities,benefits and challenges

This paper uses case studies and secondary literature to critically examine how learning spaces inhabited by geographers might be used productively as borderland spaces for learning partnership. Borderland spaces are novel, challenging, permissive and liminal, destabilizing traditional power hierarchies. In these spaces, students gain confidence in accepting agency in learning, moving towards critical thinking and reflective judgement, thereby developing self-authorship. They acquire new knowledge, skills and facets to their identity. They also feel anxiety as they take on new roles and adopt a partnership ethos. Faculty must guide students to support their successful navigation into and out of borderland spaces.     

A lightweight composite panel for the repair of cave roofs at the Mogao grottoes,China

Abstract

Erosion of the soft conglomerate of the cliff face at the Mogao grottoes of Dunhuang, China by windblown sand has thinned the rock of the roofs of many upper-level grottoes. In some cases, holes have formed; in others, the danger of roof collapse is imminent. To strengthen weakened roofs and to seal existing holes in an aesthetically acceptable manner, a lightweight, composite reinforcing and capping element was developed. The element, or panel, is made of a metal grid on a wood frame covered by geosynthetic materials, covered with sand and gravel. Potassium silicate is used to bind the sand and pebbles, thus presenting a natural appearance. Where holes exist, the interior is mud plastered on the metal grid. Experiments were conducted in the laboratory and in simulations at the Mogao grottoes to evaluate the concept and design prior to implementation. One field experiment was conducted on the ground to test cohesion and adhesion between the elements of the composite panel. The second experiment was conducted on a simulated cave (a pit in the ground) to test the final design. The method was implemented in Cave 460 in the spring of 1993. Part of the roof of this cave had collapsed, and a composite panel 4.3 × 3.1m was installed. Advantages of the method are durability of materials, light weight and a natural appearance externally, with virtually no visual intrusion on the site. After five years the performance of the panel has been entirely satisfactory. The technique will be implemented above the threatened caves at the site.     

Public–private partnerships in national cyber‐security strategies

Despite its centrality in the national cyber security strategies of the US and the UK, the public–private partnership is a nebulous arrangement, which is especially problematic in the context of critical infrastructure protection. Privately owned and operated critical infrastructure that is regarded as a potential national security vulnerability raises questions about the allocation of responsibility and accountability in terms of cyber security. As with many aspects of cyber security, this issue is often discussed with little reference to previous scholarship that could provide conceptual scaffolding. This article draws on the extensive literature on public–private partnerships in order to assess the tensions and challenges of this arrangement in national cyber‐security strategies. It finds that there is a serious disjuncture in expectations from both ‘partners’. The government regards privately owned and operated critical infrastructure as a key element of national security but is reluctant to claim a mandate to oversee network security. At the same time, the private sector is not inclined to accept responsibility or liability for national cyber security. This challenge for governments to manage national cyber security raises questions about how well equipped these states are to promote their own security in the information age. Acknowledging the flaws in the ‘partnership’ is an essential step towards addressing them.     

The Rise and Fall of a Partnership: The British Council and the Islamic Republic of Iran (2001–09)

This paper examines a partnership between the British Council and the government of the Islamic Republic of Iran (IRI) that emerged in March 2001 as a result of their shared aspiration for collaboration in scientific, academic and cultural arena. The alliance came as a surprise because after twenty-three years of antagonism on the part of the government of the IRI, the hostile attitudes were put aside virtually overnight to reunite with an old adversary for a mutual collaboration. The present qualitative study examines the reasons behind the start of the partnership, the domains within which the British Council was permitted to operate in Iran, and the reasons behind the end of the partnership. The data were gathered from various sources, including field-notes, policy documents analysis, personal interviews, and various online sources. The findings reveal that the duration of the partnership was closely intertwined with the rise and fall of the reformist administration, under President Mohammad Khatami (1997–2005). The partnership began mainly due to efforts made by the reformist administration to take the IRI out of its international isolation and thus became inactive not long after the reformist administration, and eventually came to an end in January 2009, under the presidency of Mahmoud Ahmadinejad.     

Effect of Hysteresis Type on Drift Limit for Global Collapse of Moment Frame Structures Under Seismic Loads

Seismic analyses of 3-, 9-, and 20-story moment resisting frame (MRF) buildings with 5 hysteresis models were conducted. The objectives of the study were to study the effect of the hysteresis type on the global collapse drift limit, seismic demand, and capacity/demand ratio for MRF structures under seismic loads. The results show that strength degradation significantly decreases the global drift limit and the safety of the structure, whereas, the existence of stiffness degradation or pinching has small effect. The results suggest that the global drift limit for a building is not likely to be the collapse limit state (CLS) which will most likely be governed by local collapse.