Experimental Study on Seismically Resilient Two-Span Bridge Models Designed for Disassembly

Shake-table studies were conducted on a ¼-scale, 2-span bridge model incorporating a newly-developed concept of replaceable plastic hinges and columns that can be easily assembled and disassembled. The plastic hinges incorporate novel materials that mitigate column damage and permanent drift, allowing the bridge to undergo intense seismic shaking and remain operational when most conventional bridges would warrant demolition. Designed to be disassembled, the column components have the potential to be reused, which is intended to help mitigate the environmental impact from material extraction and manufacture. The concept feasibility was demonstrated by assembling, testing, and disassembling the same bridge model twice.     

Mixed Force and Displacement Control for Testing Base-Isolated Bearings in Real-Time Hybrid Simulation

This paper presents a robust mixed force and displacement control strategy for testing of base isolation bearings in real-time hybrid simulation. The mixed-mode control is a critical experimental technique to impose accurate loading conditions on the base isolation bearings. The proposed mixed-mode control strategy consists of loop-shaping and proportional-integral-differential controllers. Following experimental validation, the mixed-mode control was demonstrated through a series of real-time hybrid simulation. The experimental results showed that the developed mixed-mode control enables accurate control of dynamic vertical force on the base isolation bearings during real-time hybrid simulation.     

Went the Day Well: Scripts,Glamour and Performance in War‐weekends

The recent growth of interest in heritage events has relied implicitly upon a modernist ontology in the way assumptions are made about the distinctiveness between visitor and performer identities. This article questions these assumptions through an analysis of the different groups of social actors attracted to war‐weekends organised through preserved steam railways. War‐weekends bring together in the same locality visitors, volunteers, performers, dressers‐up and re‐enactors sharing stories, enjoying the present and reflecting on the past—experiences in which each individual’s participation is enhanced. Although these and other ‘events’ are crucial to the continued existence of preserved railways in the UK they provide the participants with more than just a nostalgic trip back to the community spirit articulated through the so‐called ‘blitz mentality’ of the 1940s. They provide the opportunity for participants to engage both in the theatrical act of ‘being on’; of being observed by the ‘audience’ whilst at the same time acting as audience in the way they observe the other participants in the spectacle. The participants’ need to be observed is accomplished without the necessity of engaging in the rigorous training and audition processes associated with formal theatrical environments, whilst audience participation and interaction is not constrained by the usual formalities of traditional theatre.     

Ecomuseum Performance in Piemonte and Liguria,Italy: The Significance of Capital

Research carried out by the authors in northern Italy (see Corsane et al., ‘Ecomuseum Evaluation: Experiences in Piemonte and Liguria, Italy’, International Journal of Heritage Studies 13, no. 2 (2007): 101–16) was designed to assess how closely selected ecomuseums met the demands of ecomuseum theory. However, the discussions with ecomuseum personnel at five sites in Piemonte and Liguria also provided an opportunity to explore how these community‐based heritage projects measure their ‘success’. This research indicates that the methods of performance evaluation that are applied to most national or regional museums—criteria such as visitor numbers, the number of new collections that have been acquired, or number of educational activities delivered—have less meaning in an ecomuseum context. This work suggests that success could be measured more effectively in terms of the forms of capital that result from local people’s use of ecomuseological methods to engage with and conserve their heritage.     

Effect of SMA Braces in a Steel Frame Building

Pull-back and shaking table test results on a simple model of a three-storey structure that includes shape memory alloys (SMA) copper-based dampers are presented and discussed. The model corresponds to a rigid-framed steel structure and the dampers to austenite CuAlBe wires inserted as bracing at each story. The inclusion of the dissipators in the structure increases the percentage of critical damping from 0.59% for the bare case to 5.95% for the braced system. At the same time, the structural stiffness increases making the first fundamental frequency change from 2.5–3.7 Hz (0.4–0.27s). The net effect of these two factors is a 30–60% reduction of peak relative displacements compared to the ones obtained without dissipation devices when the structure is subjected to earthquake records. Depending on records frequency contents, a reduction of the peak accelerations to near 58% also can be obtained. Additionally, a crude nonlinear analytical model has been studied that can predict the earthquake responses reasonably well.     

Experimental Study on Damage Behavior of Reinforced Concrete Shear Walls Subjected to Cyclic Loads

Previous experimental research on shear walls has mainly focused on load carrying capacity, deformation, or hysteretic characteristics, with relatively little attention paid to individual damage states and their corresponding responses during the entire loading process until failure. The damage behavior of seven reinforced concrete shear wall specimens subjected to cyclic loading is presented in this study. The effects of the axial load ratio, transverse reinforcement ratio of confining boundary elements, and cross-section shape on damage characteristics, ductility, shear deformation, and crack width of the specimens were analyzed comprehensively.     

Considering Soil-Nonlinearity Effect on Seismic Performance Evaluation of Structures based on Pushover Analysis

According to the most of current seismic codes, nonlinear soil behavior is commonly ignored in seismic evaluation procedure of the structures. To contribute on this matter, a pushover analysis method incorporating the probabilistic seismic hazard analysis (PSHA) is proposed to evaluate the effect of nonlinear soil response on seismic performance of a structure. The PSHA outcomes considering soil nonlinearity effect is involved in the analysis procedures by modifying the site-specific response spectrum. Results showed that incorporation of nonlinear soil behavior leads to an increase in displacement demand of structures which should accurately be considered in seismic design/assessment procedure. Results of implemented procedure are confirmed with the estimated displacement demand including soil-structure interaction (SSI).     

Feasting at Poverty Point with Poverty Point Objects

ABSTRACT

Attempts to account for the impressive and unusual archaeological record of the World Heritage site of Poverty Point have often faltered. The vast and diverse set of artifacts, the spectacular and well-designed earthworks, and the millions of baked-clay objects known as Poverty Point Objects are all distinctive and anomalous features of the site. This paper argues that the archaeological record of Poverty Point can best be explained as the product of periodic, ritualized feasting events. Drawing on diverse archaeological and anthropological studies of feasting I demonstrate that it is a useful research framework for understanding the site’s content because many of the archaeological signatures of feasting are present at Poverty Point. I argue furthermore that Poverty Point Objects were an integral component of this culture of feasting and offer hypotheses on their role in the feasts.     

Town Twinning in Greece: Reconstructing Local Histories Through Translocal Sensory‐Affective Performances

Twinning arrangements between members and non‐members of the European Union are one of the many Euro‐symbolic measures taken with the aim of making indigenous populations “feel like citizens of Europe at the local level”. This article addresses the ways in which trans‐local projects of indoctrination, such as twinning, force indigenous peoples to reposition themselves toward what is culturally defined as local history. Its focus is on the exchange of small‐scale civilities through which partners engage themselves in sensory and affective performances of their history, and are gradually led to the reorganization of their domestic sensorium or public memory.     

Using airborne small-footprint laser scanner data for detection of cultural remains in forests: an experimental study of the effects of pulse density and DTM smoothing

Cultural remains are laborious to register by means of field surveys. Thus, in recent years several trials using remote sensing data to detect cultural remains have been carried out. The most promising remote sensing technique for such purposes is airborne laser scanning (ALS) from which digital terrain models (DTM) that enable visual interpretations of anomalies on the ground are generated. Although it has been documented previously that ALS is a powerful data source for detection of cultural remains, it has not yet been carried out studies that focus on the effects of the point density of the ALS data and properties of the subsequent generation of the DTM on the detection success of cultural remains. Thus, this study aimed at analyzing these effects by letting four experienced archeologists interpret DTMs generated from ALS data with point densities of 1 p m⁻², 5 p m⁻², and 10 p m⁻², each with three different levels of DTM smoothing. The experiment was conducted according to a randomized complete block design and the analyses were carried out using analysis of variance. The results showed that there was a significant improvement in the detection success when the point density was increased from 1 p m⁻² to 5 p m⁻². There were also some improvements when increasing the point density further to 10 p m⁻², but they were less pronounced. Furthermore, the results showed that the DTM smoothing did not have any significant effect on the detection success.