Nonlinear Structural Performance of a Historical Brick Masonry Inverted Dome

ABSTRACT

Traditional domes are obtained by double curvature shells, which can be rotationally formed by any curved geometrical plane figure rotating about a central vertical axis. They are self-supported and stabilized by the force of gravity acting on their weight to hold them in compression. However, the behavior of inverted domes is different since the dome is downward and masonry inverted domes and their structural behaviors in the literature received limited attention. This article presents a nonlinear finite element analysis of historical brick masonry inverted domes under static and seismic loads. The brick masonry inverted dome in the tomb of scholar Ahmed-El Cezeri, town of Cizre, Turkey, constructed in 1508 is selected as an application. First, a detailed literature review on the masonry domes is given and the selected inverted dome is described briefly. 3D solid and continuum finite element models of the inverted masonry dome are obtained from the surveys. An isotropic Concrete Damage Plasticity (CDP) material model adjusted to masonry structures with the same tensile strength assumed along the parallel and meridian directions of the inverted dome is considered. The nonlinear static analyses and a parametric study by changing the mechanical properties of the brick unit of the inverted masonry dome are performed under gravity loads. The acceleration records of vertical and horizontal components of May 1, 2003 Bingöl earthquake (Mw = 6.4), Turkey, occurred near the region, are chosen for the nonlinear seismic analyses. Nonlinear step by step seismic analyses of the inverted dome are implemented under the vertical and horizontal components of the earthquake, separately. Static modal and seismic responses of the inverted masonry dome are evaluated using mode shapes, minimum and maximum principal strains and stresses, and damage propagations.     

Turkey and the European Union: A Review of Turkey’s Readmission Agreement

Our aim in this article is to analyze Turkey’s Readmission Agreement with the EU in light of Turkey’s membership goal. More specifically, our aim is to propose the most rational political decision for concluding this process. Our study addresses three questions: (1) the impact of the Readmission Agreement on Turkey’s accession negotiations; (2) the outcomes of the implementation of the Readmission Agreement for Turkey; and (3) Turkey’s aim of becoming a full member of the EU by concluding the Agreement. By assessing the three potential scenarios of the Readmission Agreement process—minimum, optimum, and maximum benefit—we conclude that, whereas the first scenario does not coincide with our analysis, the other two, especially the third scenario, do coincide with it. Because the optimum benefit scenario does not disrupt the Readmission Agreement process it appears to be the most rational, balanced and beneficial agreement for both Turkey and the EU.     

4. TECHNOPOLITICS IN THE ARCHIVE: SOVEREIGNTY,RESEARCH, AND EVERYDAY LIFE

This article explores the place of the archive in the context of land claims research. This essay develops a critical approach to identity technopolitics with the aim of helping historians working with indigenous communities to ask new kinds of questions about the relationships and subject positions opened up by archivization and the myriad other technologies of land claims research. Since researchers first began preparing for the Canadian case, Delgamuukw’ and Gisday'wa v. The Queen, four decades ago, the immense stores of documentary evidence generated for the trial have given ground to numerous new claims and conflicts. Tracing the experiences of one prominent Gitxsan historical researcher who has leveraged his own archive and expertise to build genealogies for hundreds of individuals, I explore the intimate disappointments and impossible obligations that indigenous historians must mediate.     

The dynamics of emerging middle-power influence in regional and global governance: the paradoxical case of Turkey

This article attempts to understand the properties, potentials and limits of middle-power activism in a changing global order. Extensive debate on the rise of emerging powers notwithstanding, the potential contributions of emerging middle powers in regional and global governance, and the imminent challenges they face in their struggle for an upgraded status in the hierarchy of world politics, is an understudied issue. This study aims to fill this gap by offering a broad conceptual framework for middle-power activism and testing it with reference to the Turkish case. In this context, the authors aim to address the following questions: What kind of roles can emerging middle powers play in a post-hegemonic international system? What are the dynamics, properties and limitations of emerging middle-power activism in regional and global governance? Based on an extensive study of the Turkish case, the authors’ central thesis is that emerging middle powers can make important contributions to regional and global governance. Their ultimate impact, however, is not inevitable, but depends on a complementary set of conditions, which are outlined in this study.     

MINERALOGICAL AND PETROLOGICAL INVESTIGATIONS OF EARLY BRONZE AGE COPPER‐SMELTING REMAINS FROM THE KIECHLBERG (TYROL,AUSTRIA)

The prehistoric settlement on the Kiechlberg hilltop is located a few kilometres to the north‐east of Innsbruck, in the Tyrolean Inn Valley. Despite its rather isolated location, a multiphase settlement between the fifth and the second millennium bc was confirmed by archaeological investigations in 2007 and 2008. Metallurgical artefacts, such as copper ore fragments, copper slag and raw copper, as well as finished copper and bronze artefacts, are concentrated mainly in Late Copper Age to Middle Bronze Age layers. The chemical compositions of the slag and raw metals confirm Fe—Zn tetrahedrite–tennantite (fahlore) smelting. The ore was most probably imported from the 30–50 km distant copper ore deposits (mainly fahlore) of Schwaz–Brixlegg, in the Lower Inn Valley. The small amount of slag and the presence of slagged and thermally altered ceramic fragments suggest copper production in small‐scale workshops. Most probably, sulphide‐rich ores were smelted in crucibles in a hearth fire. The process was relatively reducing below the 2Sb + 1.5O₂ → Sb₂O₃ reaction (?8.5 log fO₂ at 1100°C), producing Sb‐rich (>10 wt% Sb in metal) raw copper. Inhomogeneous slag remains containing high amounts of sulphide and metal inclusions suggest a poor separation of the metal, matte (copper sulphide) and silicate/oxide melt during the smelting process.     

DETECTING AND QUANTIFYING HEAT TREATMENT OF FLINT AND OTHER SILICA ROCKS: A NEW NON‐DESTRUCTIVE METHOD APPLIED TO HEAT‐TREATED FLINT FROM THE NEOLITHIC CHASSEY CULTURE,SOUTHERN FRANCE

Heat treatment of lithic raw material is known from the Middle Stone Age to the Neolithic. These findings require archaeometric techniques and methods for detecting the heat‐induced effects within lithic artefacts. However, the existing methods are often cost‐intensive and time‐consuming, and most of them are destructive. Here, we present a new method using the infrared spectroscopic measurement of the strength of H‐bonds formed between surface silanole groups (SiOH) and H₂O molecules held in open pores of the samples. The reduction of H‐bond strength in chalcedony is shown to be strongly correlated with the loss of open pores induced by heat treatment. Hence, the method is based on measuring one of the transformations aimed for by the instigators of the heat treatment: the reduction of porosity that modifies the rock's mechanical properties. A first application to heat‐treated material from the Neolithic Chassey culture (southern France) shows that flint was heated to temperatures between 200°C and 250°C in this period. This has important implications for the study of the procedures used and the heating environments. Our new method is non‐destructive, rapid, cost‐effective and allows for detection of the used annealing temperatures.     

SENSITIVITY OF PARAMETERS FOR PROBABILISTIC SEISMIC HAZARD ANALYSIS USING A LOGIC TREE APPROACH

The sensitivity of different parameters used in probabilistic seismic hazard calculation is investigated by different logic tree runs with alternative magnitude sets, source zone models and attenuation relations, and with different sets of values for the seismicity parameters and the <r-value. Also the influence from the different parameters on the hazard uncertainty, represented by fractiles, is investigated. The calculations are made for peak ground acceleration at a site near Aachen in the Lower Rhine Embayment. The model where the site is located in a larger source zone gives lower hazard values. This is typical for the case where the seismicity near the site is high relative to its surrounding. The hazard curves for the different attenuation functions are similar, an effect of the similarity of the functions themselves. However, a large sensitivity of this parameter is indicated for small mean return periods. An increased α-value implies a moderate increase of the hazard at long mean return periods. The hazard is increasing for decreased focal depth, decreased β-value and increased maximum expected magnitude, respectively. However, the effects are noteworthy only at low hazard levels for variations in the focal depth and to some extent in the maximum expected magnitude. Finally, decreasing the minimum magnitude thought to be of engineering relevance causes a drastic increase of the hazard at small mean return periods.     

Dynamics of Value Chain Governance: Increasing Supplier Competence and Changing Power Relations in the Periphery of Automotive Production—Evidence from Bursa,Turkey

Adopting a global value chain (GVC) approach, this paper focuses on the ways in which global automotive transnational corporations coordinate their value chains with suppliers in the periphery of automotive production. In particular, it directs attention to particular forms of chain relations established by lead firms with suppliers in Turkey and the ways in which these chains are coordinated. Findings indicate that as component suppliers in the periphery of automotive production, such as those in Bursa, have gained the competencies not only to manufacture to the cost, quality and flexibility specifications required by their customers but also of design and product development, lead firms in the automotive industry have turned to modular value chains, where competent suppliers provide a range of services with less dependence on their customers, as a way of sourcing from these suppliers. I use this evidence to argue that GVC governance is dynamic and suppliers in the periphery have some room for breaking power asymmetries associated with specific modes of governance in GVCs.     

Two Early Archaic Shipwrecks at Kekova Adası and Kepçe Burnu,Turkey

During its annual surveys of the Turkish coast in the 1970s and 1980s, the Institute of Nautical Archaeology discovered two early Archaic (7th‐ to early‐6th‐century BC) shipwrecks at Kekova Adas? (Antalya region) and Kepçe Burnu (Mu?la region); Dokuz Eylül University's Institute of Marine Science and Technology is currently involved in survey of the region. The wrecks, marked by a primary cargo of basket‐handle amphoras, indicate exchange between Cyprus and the cities of coastal Asia Minor and Corinth. Such Iron Age internationalism may have been driven by an interest in processed agricultural goods such as olive oil. © 2010 The Authors