Effectiveness of FRCM Reinforcement Applied to Masonry Walls Subject to Axial Force and Out-Of-Plane Loads Evaluated by Experimental and Numerical Studies

ABSTRACT

An experimental campaign and a numerical analysis devoted to the investigation of the out-of-plane behavior of masonry walls reinforced with Fiber Reinforced Cementitious Matrix (FRCM) are presented here. The main goal of this study is to analyze and evaluate the effectiveness of the strengthening system, by discussing failure modes and capacity of strengthened masonry walls, in order to assess their behavior under out-of-plane horizontal actions, such as, for example, seismic actions. A purposely designed experimental set-up, able to separately and independently apply an axial force and out-of-plane horizontal actions on masonry walls, was used. Experimental results are discussed and compared with the outcomes of nonlinear analyses performed on simplified finite element models of the walls. A proper evaluation of the flexural capacity of FRCM strengthened walls is the first step of the ongoing process of drawing reliable code guidelines leading to a safe design of strengthened masonry structures.     

Seismic behavior of two Portuguese adobe buildings: Part I - in-plane cyclic testing of a full-scale adobe wall

This article addresses the laboratory testing of a full-scale double-T shaped adobe wall, under in-plane horizontal cyclic loading of increasing amplitude, with the aim of contributing to the understanding of the seismic behavior of adobe structures. The wall was built with lime adobes taken from an existing building and mortar with a traditional composition. The behavior of the wall was assessed in terms of: shear stress versus horizontal drift and moment versus rotation relationships; maximum lateral strength; drift and rotation at peak stress; evolution of stiffness, lateral displacements, dissipated energy, and natural frequency; and damage pattern. The wall exhibited brittle behavior and in-plane strength corresponding to 56% of the vertical load. Cracking was observed with an X-shaped pattern whereas no sliding occurred at its base. This research supported the subsequent development of a repair and retrofit solution and also of numerical models to simulate the seismic behavior of two adobe buildings.     

The later prehistory of mainland Southeast Asia

Until the recent expansion of research into the prehistory of mainland Southeast Asia, the development of civilizations employing Indian religious and political concepts had been seen as a major fulcrum in the area's history. The prehistoric sequence in the area is reviewed, with particular attention being paid to evidence for ritual, display, exchange, and ranking behavior within lowland sedentary communities. These date to the two or three millennia preceding Indian contact. It is argued that already by the end of the prehistoric period, there were complex centralized societies with a long tradition of recognizing status differentials among individuals, affiliated groups, and communities. The sequence incorporates the exploitation of rice, and bronze and iron working. The chronology of these innovations is compared with that in China. It is not possible at present to argue for single or multiple origins, but the area of southern China is suggested as a crucial one in further research to resolve these issues.     

西安市市民出游行为研究

本文在详细的市场调查基础上,分析了西安市民出游的行为特征,重点探讨了行为特征形成的深层原因,并对以西安为代表的内陆大城市和沿海城市居民出游规律做了对比分析,从而对西安市民的出游行为有了较深刻的认识,为西安市旅游决策提供了科学的依据。     

微区位研究的新思维

论文从区位尺度观、空间关联、行为观、空间竞争、平衡最优理论等五个方面探讨微观区位研究的新视角、新思维。指出微区位研究与传统的区位研究的区位选择主体、空间范围、影响因素都有很大不同。区位选择对象与周边环境的空间关联制约微观环境下的区位空间类型。经营者与消费者的行为、文化心理对微区位选择构成重要影响。市场的空间竞争关系到布局对象的生存与发展。微区位追求的目标应当是经营者的最大利润与消费者的最大剩余效用之间的平衡,最大限度利用空间外部效果对微区位选择具有重要意义。     

The Little Revolution in New South Wales, 1808

In this article, ‘Development’ and developmentist ideas, two increasingly fashionable areas of historical inquiry, are explored in the context of relations between the United States and Brazil through the middle decades of the twentieth century, with three arguments made along the way. First, and in contrast to much academic and extra-academic received wisdom (as well as the official pronouncements of US diplomats), the United States government offered no singular or consistent approach to ‘development’ in its dealings with Brazil. Second, an unofficial vision of development (here termed ‘market developmentalism’) that has so far eluded the attention of historians of developmentalist ideas emerged earlier than the official developmentalisms that have been the main object of historiographic interest to date. Third, this unofficial, largely private, consumption-oriented developmentalism is shown to have enjoyed an outsized influence in Brazil, dwarfing the influence enjoyed by those inconsistent varieties of developmentalism espoused by US diplomats between the 1940s and the 1960s.     

History of the Discovery of the Antipsychotic Dopamine D2 Receptor: A Basis for the Dopamine Hypothesis of Schizophrenia

The 1975 publication of Seeman et al. (Proc Nat Acad Sci, USA), reporting the discovery of the antipsychotic receptor in the brain, is a classic example of translational medicine research. In searching for a pathophysiological mechanism of psychosis, the team sought to identify sites that bound the antipsychotic drug haloperidol. Their criterion was that haloperidol bound to the site at one to two nanomoles per liter, corresponding to haloperidol concentrations found in spinal fluid or plasma water in treated patients. They requested de novo synthesis of tritiated haloperidol, and it readily detected specific haloperidol binding sites in brain striatum. With dopamine binding the haloperidol-labeled sites with higher potency than other neurotransmitters, the sites were named antipsychotic/dopamine receptors (now designated dopamine D2 receptors). Most significantly, they found that all antipsychotics bound these sites at concentrations and with a rank order of potencies that were directly related to the mean daily antipsychotic dose taken by patients with schizophrenia. Their findings enabled screening for new antipsychotics, initiated D2 receptor measurements in brain of living patients, and determination of minimum occupancy (65%) of D2 receptors for antipsychotic benefit. The collective work is generally viewed as providing a fundamental basis for the dopamine hypothesis of schizophrenia.     

Central Park against the streets: the enclosure of public space cultures in mid-nineteenth century New York

The industrialization of New York and its rise to economic dominance brought about a major restructuring of street life and unleashed an array of contradictory everyday urban cultures. In a still under-regulated environment, the commoning of public space became a key sociospatial capital that helped the working classes resolve their reproduction in a way the elite found disturbing and far removed from the civic order they were trying to instil. This article draws on recent theorizations of the commons/enclosure dialectic to develop a comparative analysis of the cultures of public space use vis-à-vis the practices prescribed by Central Park in its attempt to reform everyday spatialities. The park is understood here as an early episode in the project of imposing new social relations through the enclosure of public conduct—a first effort to tame the urban commons and prevent the subaltern appropriation of public space. Following a preliminary discussion of the economic and social determinants and configuration of the material cultures of public space use in Manhattan, the article studies the park's strategies as a special type of enclosure, consisting not of the usurping of common land for private profit but of the mobilization of public space to shift behaviors from one regime of publicity to another.     

Endangered species,archaeology, and stable isotopes: huemul (Hippocamelus bisulcus) isotopic ecology in central-western Patagonia (South America)

The management and conservation of animal species should be based upon a long-term analysis that considers its geographical distribution and feeding patterns. The study of carbon and nitrogen stable isotopes on skeletal remains provides a quantitative approach to the paleodietary reconstructions and constitutes a potent tool for comparing behavioral aspects of the fauna. In this paper we present the first set of isotopic values for modern and archaeological samples of Huemul (Hippocamelus bisulcus) from the forests of Central-western Patagonia, Chile. Contrary to initial expectations, our analysis indicates that there is no evidence of an important incidence of the canopy effect on the δ¹³Ccollagen values, which we suggest is due to an ecological selection that drives the huemul to focus its predation on open sectors within the forest. On the other hand, a wide range of δ¹⁵Ncollagen values for huemul was verified. This could reflect the N impoverishment of the forest soils and provide an interesting ecological indicator. The long-term information offered by the archaeological record provides the necessary context for decision-making conducive towards the preservation of Hippocamelus bisulcus in Patagonia.     

The Effects of Competition‐Based Public Policy on Contractual Arrangements

When competition is naturally limited, policymakers craft regulation to obtain effects similar to those that would have occurred in the presence of competition. In many instances, regulation of this type is not successful in overcoming market failures. We rely on property rights theory and transaction cost theory to predict when state‐level policy statements will actually lead to a redistribution of benefits at the city level. We test this theory in the context of cable television franchise renewal agreements—a setting historically resistant to competition. We look to the language of the franchise agreements for evidence of concessions made by the cable operator to the city, and using a difference‐in‐difference estimator, we find that pro‐competitive regulation translates into concessions to the city. However, a credible threat of competition embedded in regulation is not enough to curb opportunism associated with monopoly supply in cases of large franchisees; larger cable operators are at least 60 percent less likely to offer more favorable terms of trade. However, consistent with transaction cost predictions, asset‐specific investments by the cable operator do curb opportunism; there is a 51 percent increase in the odds of a franchisee offering more concessions for a 1 standard deviation change—about 1,020 mi of the plant. These findings are important for those involved in crafting policy at all levels of government as well as for researchers interested in understanding the role of long‐term contracting and the use of hybrid mechanisms such as franchise agreements in contemporary governance.