Cyclic Response of Concrete Beams Reinforced by Plain Bars

There are many reinforced concrete structures throughout the world that have been built in the past decades that lack appropriate seismic details and reinforced by plain bars. To study the behavior of such buildings, seven beams have been tested under cyclic and monotonic load. The specimens include substandard specimens, with deficient seismic details and reinforced by plain bars, specimens designed in accordance with ACI-318-99 but reinforced by plain bars, and standard specimens reinforced by deformed bars. The tests indicate that the substandard specimens sustain relatively large slip of longitudinal bars, separation of specimen relative to foundation and sliding at large deformation phase, low initial stiffness ratio, limited lateral displacement capacity, and loss of nominal yield strength. The specimens reinforced by plain bars in accordance with ACI-318-99 perform almost similar to standard specimens with deformed bars, in terms of elastic stiffness and lateral displacement ductility; but, they sustain larger slip, and smaller yield strength. Failure of all specimens reinforced by plain bars is characterized by flexural cracks without visible shear failure. Residual shear strength of substandard specimens is modeled by dowel action of longitudinal bars to predict a lower limit for lateral strength of the specimens.     

Localising the Australian National Action Plan on Women,Peace and Security: a matter of justice

In the bid for a non-permanent seat on the United Nations (UN) Security Council, the Australian government emphasised international peace and security and Indigenous peoples as two of the eight key elements supporting its nomination. Australia's positive track record in support of the UN Women, Peace and Security (WPS) agenda, including the delivery of an Australian National Action Plan (NAP) along with recognition of historical injustices to Indigenous Australians, was highlighted as a valid and important argument in favour of its nomination. The Australian NAP, however, has all but ignored the local context in its development and application, focusing instead on its commitments abroad. This framing of the Australian NAP is informed, firstly, by the WPS agenda policy framework applying to conflict and post-conflict situations, and, secondly, by its location within the UN mandate, requiring those situations to be internationally recognised. This article applies Nancy Fraser's tripartite justice framework to reveal that the Australian NAP gives rise to the political injustice of ‘misrepresentation’ in relation to intra-state (violent), domestically situated Indigenous–settler relations, which are denied the status of ongoing internationally recognised conflict. The author suggests that the remedy to this injustice is to reframe and recognise the conflict status of Indigenous–settler relations in the localisation of the Australian NAP. This localisation creates openings for Indigenous Australian women to engage with the WPS agenda in meaningful ways.     

土质文物盐害中硫酸钠的研究——从微观到宏观

土遗址和壁画遗址可溶盐主要为NaCl和Na_2SO_4,其中Na_2SO_4是破坏程度最严重的盐。一般认为,硫酸钠只有在温度、湿度变化时才不稳定,才发生得失结晶水引起的晶型及体积变化。为研究土质文物盐害的形成机制及内在原因,调研了全国几处典型土遗址和壁画遗址的盐害状况并取样分析。分析发现:1)土遗址和壁画遗址中硫酸钠的形貌、结构是动态变化的(无论在任何极端干燥环境甚至真空条件下);2)环境因素如温度、相对湿度的变化只是加剧上述变化进程。硫酸钠结晶析出时,其体积膨胀约4倍。这一系列的过程,深刻影响着硫酸钠的相变复杂性和对依存土质文物本体的破坏性。本工作从微观和宏观两个层面探讨了这些发现,并通过不同盐分(不同浓度氯化钠、硫酸钠)侵蚀破坏模拟试验、不同温度条件下模拟试验、不同相对湿度下模拟试验,从宏观层面印证了上述微观机制在土遗址和壁画遗址本体的外在表现。本研究发现土遗址中硫酸钠的形貌、结构是动态变化的,该工作弥补了以往研究和认识上的局限。本研究将对阻止、延缓及预测土质文物盐害的发生、发展提供科学参考。     

Implications of Thrown-Out Boulders for Earthquake Shaking

In the source areas of some large shallow earthquakes, we have found many dislodged boulders struck by severe ground shaking. Some boulders were located at quite distances from the former sockets, which remained undisturbed with surrounding clear edges. This fact indicates the possibility that vertically upward seismic acceleration exceeded the earth's gravity (1g). This phenomenon of upthrown boulders is investigated herein by examining the effects of waves, which emanate deep in the ground due to an earthquake, propagate through the ground and boulder, and reflect back to the ground, involving a variety of their interaction. An elastic dynamic analysis is carried out on the basis of a one-dimensional continuum model consisting of the ground and boulder. It is subjected to the input of the Ricker wave, which is intended to simulate an earthquake-generated wave, emanating from the bottom of the model ground. The upthrow of a boulder is taken to occur when the dynamic response at the bottom of the boulder satisfies certain conditions. It turns out that the possibility of upthrow occurrence is high when the period of the Ricker wave coincides with the fundamental period of the ground vibration. It leads to the conclusion that the upthrow takes place due to resonance in the response of the system of the ground and boulder to the external wave input. The upthrow possibility increases as the input acceleration increases. Trial is made of predicting the maximum acceleration and velocity of an earthquake, based on this consideration of the up throw phenomenon.     

Direct Displacement-Based Design of Glulam Timber Frame Buildings

We introduce a direct Displacement-Based Design methodology for glued laminated timber portal frames with moment-resisting doweled joints. We propose practical expressions to estimate ultimate target displacement and equivalent viscous damping, and we demonstrate that these expressions provide prior values that are close to those obtained a posteriori using a more refined model. Applied to case studies, the method yields base-shear forces lower than those obtained using the force-based approach of Eurocode 8. This is due to the high dissipation capacity of the specific connection technology, which apparently is conservatively accounted for in the q-factor of Eurocode 8.     

Travelling the Route from Designation to Local Action: The Case of the Underground Railroad Settlement in Buxton,Ontario, Canada

Canada’s Buxton Settlement National Historic Site is a striking illustration of the multi‐faceted conservation of a cultural landscape, from federal designation through to local action. Buxton is designated as a ‘continuing landscape’ distinguished by its establishment in 1849 as a 9,000 acre (3,600 ha) ¹ [1] Imperial measures are given first in reference to the historic resource because the measurements are historically significant. terminus for black fugitives travelling north along the so‐called Underground Railroad, escaping the tyranny of slavery in the USA. A social experiment, in the form of a block farming settlement, waited for them at the end of their journeys. Over the intervening years inevitable shifts in agricultural practice and property ownership have transformed this rather ordinary but strongly evocative heritage resource. This is a case common to many other significant cultural landscapes—the management of the inevitable evolution that comes with a landscape that continues. This agricultural landscape confronts many of the challenges that are the focus of heritage studies today: how to give local people a voice while coordinating conservation across multiple scales of government policy.     

行动学习法是公务员培训模式创新的有益尝试——行动学习法在我国西部地区公务员培训中的实践

行动学习是一个以完成预定的工作为目的、在同事的支持下持续不断地反思与学习的过程。行动学习法以小组合作为主、以解决工作中遇到的实际问题作为学习和研究的载体和平台,以达到学员间相互学习和提高并完成预定的工作为目的。实践证明,行动学习法对改进和创新我国公务员培训工作意义重大。     

Public participation geographic information systems (PPGIS): challenges of implementation in Churchill,Manitoba

Public participation geographic information systems (PPGIS) increasingly are utilized in geographic research, yet researchers rarely are provided with guidance on how to implement PPGIS in an appropriate and effective manner. This article reports on the process of research that explores responses to current and future local tourism development offered by a sample of residents using a modified PPGIS approach called ‘community action geographic information system’ (CAGIS). The conceptual development of CAGIS is reported and the challenges encountered during its implementation in Churchill, Manitoba during 2005–2007 are reviewed. It is suggested that researchers wishing to conduct similar research should undertake thorough preliminary fieldwork to assess the likelihood of finding agreement on a common problem; acquiring adequate resources; establishing collective responsibility for the project's outcome; attaining stakeholder support; developing trust and meaningful relationships; and incorporating indigenous knowledge appropriately. Feedback of results to community members also should be an integral part of the research process. A number of feedback mechanisms are reported, including an interactive weblog, which helped facilitate communication between heterogeneous groups in Churchill. Although ambitions for a truly participatory GIS approach to this project have been set aside, it is held that PPGIS can yield positive outcomes for communities and academia. Sharing this research experience will be useful to others who venture into PPGIS research, especially in northern communities.     

Feminist geographies and participatory action research: co-producing narratives with people and place

Abstract

This review offers thoughts, queries and hesitations regarding articles drawing on participatory action research (PAR) published over 25?years of Gender, Place and Culture. It foregrounds the interconnections and overlaps between PAR and feminist geographies, and considers a continuum of participations-collaborations-actions-knowledges co-produced across a range of interrelated feminist methodologies. I emphasise epistemological commitment as central to PAR, pointing to work in GPC that evidences critical approaches to research process, embedded in feminist perspectives regarding how scholars re-produce the world and/as act/ing in the world, particularly in attending to shifting, situated and complex subjectivities and power inequalities. Working together with participants is vital, through an ethic that centres participants’ voices, as actors in their own lives. Highlighting the emotional and embodied geographies that weave through such research and writing, this review suggests deepening and strengthening interdependences and a feminist ethos of care as researchers, to further foreground diverse stories and voices, work towards social and spatial justice, and co-produce progressive changes with people and place.     

Memory as Archaeology: An Experience of Public Archaeology in the Atacama Desert

Conducting archaeological projects in areas inhabited by Indigenous Communities who dislike both excavations and archaeologists leads to an ethical conundrum, one requiring a reconsideration of the research methodologies utilized in these settings, and a turn toward Public Archaeology as a means to find alternative pathways. This article describes a research project conducted in the Indigenous Atacameño Community of Peine, in the Atacama Desert, Chile, where, through a principal methodology of Participatory Action Research, it became possible to explore the past of this community in ways that were both meaningful and valid for its members. The results drawn from this experience differ markedly from traditional archaeological approaches (i.e. excavations, analysis of material culture), both in terms of the nature of the knowledge recovered and the temporal depth achieved. In this particular instance, collective remembrance and embodied memory featured prominently in accounting for the past of Peine.