An Enhanced Finite Element Macro-Model for the Realistic Simulation of Localized Cracks in Masonry Structures: A Large-Scale Application

ABSTRACT

Finite element macro-modeling approaches are widely used for the analysis of large-scale masonry structures. Despite their efficiency, they still face two important challenges: the realistic representation of damage and a reasonable independency of the numerical results to the used discretization. In this work, the classical smeared crack approach is enhanced with a crack-tracking algorithm, originating from the analysis of localized cracking in quasi-brittle materials. The proposed algorithm is for the first time applied to a large-scale wall exhibiting multiple shear and flexural cracking. Discussion covers structural aspects, as the response of the structure under different assumptions regarding the floor rigidity, but also numerical issues, commonly overlooked in the simulation of large structures, such the mesh-dependency of the numerical results.     

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.     

A rallying point for different predators: the avian record from a Late Pleistocene sequence of Grotte des Barasses II (Balazuc,Ardèche,France)

The presence of processed birds in the archeological faunal record is considered key to assessing human dietary evolution. Taphonomic studies on birds from sites older than Marine Isotope Stage (MIS) 2 have become relevant in the last few years, leading to the proposal of more complex scenarios of human subsistence. Several works have demonstrated direct evidence of bird consumption by Homo prior to anatomically modern humans in Europe; however, others support the hypothesis of non-anthropogenic bird accumulations. This has led to the necessity of determining what elements or factors cause the human exploitation of birds in some archeological sites before the end of the Pleistocene. The Grotte des Barasses II site is located within this framework. Short-term human occupations have been attested by the presence of lithic tools and processed macrofaunal remains. Additionally, a small assemblage of bird bones has also been recovered. Here, we present a detailed taphonomic study with the aim of exploring possible relationships between these avian taxa and human occupations. Despite the fact that Neanderthals inhabited the cave, avian specimens show damage pointing to different causative agents. Direct evidence (digestion, gnawing) indicates that mammalian carnivores and nocturnal raptors were mainly involved in the accumulation of bird bones. We propose some factors that might determine whether or not small game was exploited in this specific locality and emphasize the importance of such analytical approaches in the general interpretations of the Pleistocene sites.     

Socio‐cultural innovations of the Final Umm an‐Nar period (c.2100–2000 BCE) in the Oman peninsula: new insights from Ra's al‐Jinz RJ‐2

The Early Bronze Age site of RJ‐2, located close to the coastal village of Ra's al‐Jinz on the eastern Omani coast (Niyabat Ra's al‐Hadd), was the focus of archaeological investigations for over two decades. The latest campaigns of excavation unearthed an architectural complex (Building XII) dated to the very end of the Umm an‐Nar period (Final UaN, c.2100–2000 BCE), previously attested on site by poorly preserved remains. This paper presents the remains explored during the most recent fieldwork, focusing on the stratigraphic‐structural sequence and the spatial layout. It also considers the transformations affecting structural evidence and material culture during this period, at both local and regional level, highlighting their significance for a comprehensive assessment of the last occupations related to the Early Bronze Age in south‐eastern Arabia. The paper concludes by showing how the Final Umm an‐Nar phase represents an age of substantial socio‐cultural innovations, which most likely shaped the transition towards the following Wadi Suq period.     

The utility of livestock dung for reconstructing recent ethnological and environmental histories

Animal dung is evaluated here as a tool to reconstruct recent societal and environmental changes. Studies completed on the macro- and micro-contents from dung deposited in a mountain cave in Catalonia during the 1970–1980s, preceding the socio-economic changes in the area, was supplemented by the testimony of the last shepherd alive in the area. This information was also compared with evidence from aerial photographs of the area surrounding the cave taken in 1956 and 2009. Although taphonomic distortion of the dung shape precluded its assignment to its producers based on morphology, information from the organic remains reflects the agro-pastoral activities in the mountainous area of the Catalan coast. A lack of calcium phosphate and abundant phytolith and epidermal remains from wild species indicates that the dung was excreted by ovicaprines, who sheltered in the cave during spells of adverse weather. These indicators also signify that the animals fed only on natural vegetation. Insect remains in the dung include fragments of chafers, dung and ground beetles, bees and ants, and whilst the latter may have foraged in the cave, the others may have been accidentally ingested by herbivores. The nannofossils and diatoms found in the dung derive from tertiary crops 4 km away from the cave but within the range of the ovicaprine herd. The lack of cereal and vegetable remains in the dung is consistent with the ethnographic record that shepherds and farmers could not afford to supplement the herds’ diet with fodder crops or grain, a consequence of the low productivity of the local subsistence agriculture. This study further discusses the socio-economic impacts of the introduction of intensive farming, industrialisation and tourism in Catalonia during the latter part of the last century and how they are represented in the dung.     

Compositional Analysis of 14th–15th Century Enamels from the Altar of San Giovanni in Florence: an Integrated Study by Portable X‐Ray Fluorescence and Electron Probe Microanalysis

The enamels of the Altar of San Giovanni, from the Baptistery of Florence, were investigated using both non‐invasive and micro‐invasive analysis in order to elucidate the glass melting and colouring techniques. A few fragments detached from the altar and recovered by the restorers were analysed in cross‐section by electron probe microanalysis. Moreover, non‐invasive investigations by portable XRF allowed a large number of enamelled plaques to be investigated. The results showed a good agreement between the two techniques and made it possible to identify similarities or differences in the enamels of the three manufacturing periods of the altar.     

Green Infrastructure Planning: Cross-National Analysis between the North East of England (UK) and Catalonia (Spain)

As green infrastructure (GI) plans are being developed and implemented in a number of regions throughout the UK and interest in the theory and methods is emerging in various other countries there is opportunity to explore the potentials for GI planning throughout Europe. Using the experience of the UK, and particularly that of stakeholders and organizations in the North East of England, we analyse the functions and benefits that a GI network can provide and, through cross-national comparison, we critically theorize the potentials for GI planning in Catalonia. While recognizing that there are key differences between these regions, particularly in relation to climate, societal characteristics, institutional organizations and frameworks for landscape planning, we discuss the transferability of the characteristics which appear to be provided from GI planning in the UK. We conclude that, overall, the implementation of GI planning would be relatively easy to achieve and mostly beneficial under a Mediterranean environment. Our conclusions are tempered by a recognition that the provision of functions and benefits are subject to the influence of the particular organizational characteristics and the cultural background of each region, and in particular the different impacts that climate change is likely to have.     

Book reviews

RODERICK STACKELBERG. Idealism Debased: From Völkisch Ideology to National Socialism. Kent, Ohio: The Kent State University Press, 1981. Pp. XIII, 202, 3 plates. $18 (US). Reviewed by Lawrence D. Stokes

JEROME CH'EN. China and the West: Society and Culture 1815–1937. Bloomington and London: Indiana University Press. Pp. 488. $25.90 (Can.) Reviewed by David P. Barrett

FREDERICK W. MARKS ill. Velvet on Iron: The Diplomacy of Theodore Roosevelt. Lincoln and London: University of Nebraska Press, 1979. Pp. xiv, 247. $15.00 (US). Reviewed by Raymond A. Esthus

CRAIG L. SYMONDS. Navalists and Antinavalists: The Naval Policy Debate in the United States, 1785–1827. Newark: University of Delaware Press, 1980. Pp. 252. $17.50 (US). Reviewed by Reginald C. Stuart

BERNARD RANSOM, Connolly's Marxism, London: Pluto, 1980. Pp. 126. Reviewed by Desmond Bowen

THOMAS A. BAILEY and PAUL B. RYAN, Hitler vs. Roosevelt: The Undeclared War. London: Collier Macmillan, 1979. Pp. 302. £7.45. Reviewed by Ronald W. Pruessen

M.A. HICKS, False, Fleeting, Perjur'd Clarence; George, Duke of Clarence, 1449–1478. Gloucester: Alan Sutton, and Atlantic Highlands, NJ. Humanities Press, 1980. Pp. 270. $22.00 (US). Reviewed by Robert Tittler

MURIEL ATKIN, Russia and Iran, 1780–1828. Minneapolis: University of Minnesota Press, 1980. Pp. xii, 216. $20 (US). Reviewed by M.E. Yapp

J.K. FEDOROWICZ. England's Baltic Trade in the Early Seventeenth Century: A Study in Anglo-Polish Commerical Diplomacy. Cambridge: Cambridge University Press, 1980. Pp. XIII, 334. $35 (US). Reviewed by David S. Macmillan

MICHAEL CROWDER. Colonial West Africa: Collected Essays. London: Frank Cass, 1978. Pp. 341. $28.50 (US). Reviewed by John Flint

PETER GRAF KIELMANSEGG. Deutschland und der erste Weltkrieg. 2. Auflage. Stuttgart: Klett-Cotta, 1980. Pp. XI, 755. Reviewed by Henry Cord Meyer

PIOTR S. WANDYCZ. The United States and Poland. Cambridge, MA: Harvard University Press. Pp. XVI, 465. $28.50 (US). Reviewed by Stanislaw Bobr-Tylingo

FREDERICK COOPER. From Slaves to Squatters: Plantation Labor and Agriculture in Zanzibar and Colonial Kenya, 1890–7925. New Haven: Yale University Press, 1980. Pp. xi, 328. $25 (US). Reviewed by Mike Mason

DONALD E. QUELLER. Medieval Diplomacy and the Fourth Crusade. London: Variorum Reprints, 1980. Pp. 322. £22. Reviewed by Bernice M. Kacznski

CHRISTINE MOSS HELMS. The Cohesion of Saudi Arabia: Evolution of Political Identity. London: Croom Helm, &; Baltimore: The Johns Hopkins University Press, 1981. Pp. 313. $25.00 (US). Reviewed by Ray L. Cleveland

CHRISTOPHER H.D. HOWARD, editor. The Diary of Edward Goschen, 1900–1914. London: Royal Historical Society (Camden Fourth Series, Vol. 25), 1980. Pp. xn, 315. £10. Reviewed by Briton C. Busch     

Introducing urban vitality as a determinant of children's healthy mobility habits: a focus on activity engagement and physical activity

In this study we introduce urban vitality as a determining factor for both physical activity (PA) and activity engagement in children living in Barcelona's Metropolitan Region. We compare the physical outcomes of children living in vital and non-vital areas using mobility data taken from a travel survey. Chi-square, and association tests were used to compare the health outcomes of children living in vital and non-vital areas. Specifically, we measured for activity engagement, walking for transport, minutes of PA and adequacy to World Health Organization PA recommendations. Results are stratified by age and gender and reveal how living in a vital area can produce up to 54 minutes more of PA per week, with a difference of nearly 20% in the number of outdoor activities undertaken. Neighbourhood vitality promotes healthier mobility habits, as children living in buzzing areas tend to engage in more activities and spend more minutes walking for transport.