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.     

Harvesting the Seashores in the Late Mesolithic of Northwestern Europe: A View From Brittany

The shell middens of Brittany provide the last evidence of a Mesolithic way of life along the French Atlantic façade. This is partly a result of Holocene marine transgressions that prevent easy access to earlier coastal settlements. Nevertheless, the dependence on the sea seen in the Late Mesolithic seems to be a consequence of a long-established exploitation system. Stable carbon and nitrogen isotope signatures in human bone reflect a dominance of marine protein, while the zooarchaeological components of shell middens show a high species richness of exploited marine resources. Paleoenvironmental reconstruction suggests that more or less the whole range of resources exploited was accessible in the immediate vicinity of the sites. Seasonal aspects of the utilised and potentially available subsistence resources, along with stable isotope and lithic data, raise the possibility of restricted mobility for these populations, within relatively limited territories. The impression of extreme dependence of these coastal populations on the seashore might have been a key factor in their final disappearance, whether this is viewed as replacement or acculturation. Indeed, the Mesolithic communities of Brittany could have been caught between rising sea-levels and the arrival of Neolithic communities from the east and the south.     

“Bao wei quan” 保位權, Chapter 20 of the Chunqiu fanlu 春秋繁露

This work provides an annotated translation, together with a brief commentary, of the “Bao Wei Quan” chapter, the 20th chapter of the Chunqiu fanlu. The Chunqiu fanlu is an important Chinese Confucian text. It is ascribed to a pivotal Former Han (206 BCE – 9 CE) scholar, an exegete of the Gongyang zhuan 公羊傳, Dong Zhongshu 董仲舒 (ca. 195–115 BCE). This text offered to readers an ideal of rulership that remained highly relevant to the development of the ethical and political discourse of Chinese Confucianism. Despite its importance, the Chunqiu fanlu has only very recently been fully translated into a Western language, ¹1 See Luxuriant Gems of the Spring and Autumn, attributed to Dong Zhongshu. Edited and translated by Sarah A. Queen and John S. Major (New York: Columbia University Press, [December] 2015).View all notes and is one of the rare major classical Chinese texts which still lacks a full Japanese translation. Thus, the purpose of this work is to contribute to the ongoing Chunqiu fanlu translation project and to present to the reader some of the form and content of this influential work.