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Seismic performance assessment is carried out for reinforced concrete structure built in low-strength concrete lacking confining ties in beam-column joint. Shake-table tests were performed on 1/3rd scaled two-story frame using design-spectrum-compatible accelerogram, scaled to various target levels. The frame is observed with beam longitudinal bar slip and pullout. Joints with no confining ties experienced extensive damage, observed with cover/core concrete spalling. The frame could resist 70% of the design ground motion to remain within the code-specified drift limit. The code requirement for minimum column depth will not avoid joint damageability in case of low-strength concrete and joints lacking confining ties.  相似文献   
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A combination of revolutionary ideology, trouble with neighbours and location in the Middle East, where regionalism is moribund, make the Islamic Republic of Iran an unlikely enthusiast for regional coalition-building. The impetus towards regionalism derives first and foremost from geopolitical considerations–the need to counter the US government's efforts to isolate Iran–but also from domestic dynamics; the regionalist discourse has lent an acceptable ideological colouring to an increasingly pragmatic foreign policy.
Iran's neighbours, however, share neither its geopolitical predicament nor its ideological complexion, and the actual implementation of Tehran's regionalist agenda has been based on functional cooperation, rather than on geopolitics and ideology. Trade promotion and the development of transport infrastructure to link Central Asia and the Caspian to Turkey and the Persian Gulf have been the most appealing areas for northern neighbours, and dominate the agenda of the Economic Cooperation Organization, Iran's main vehicle for multilateral cooperaton with Central Asia and Azerbaijan. Tehran's 1992 proposal for a Caspian Sea Cooperation Organization has so far been stymied by the littoral states' well-publicized disagreements over the sea's legal status, though their numerous multilateral meetings and handful of agreements suggest that the idea has potential in the medium–term.
Notwithstanding the meagre tangible results to date, Iran's tilt towards regionalism has had a positive impact. It has helped to rehabilitate the Islamic Republic in the eyes of its neighbours, contributed to the evolution of policy debate at home and prepared the ground for future multilateral cooperation.  相似文献   
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This paper presents an empirical study conducted in a small traditional city, Salt, Jordan. An investigation was made to examine residents' ‘images of the past’. The objective was to identify building attributes that influence these residents' images. A survey research design using multiple sorting tasks with open‐ended questions was used to identify these building attributes. The images were elicited through the observation of coloured photographs of a sample of older buildings in the city centre. Images of the past were examined within three content areas: knowledge of the past; date of construction; and character of the past of Salt City. The building attributes investigated were: contour, size, shape, surface quality, signage, visibility, use, and significance. The results of the study suggest that older buildings in the centre of the city evoked similar images of the past focused on public or social buildings along with residential settlement building. Attributes relating to images of the past were original use, date of construction, historic signage, and historic integrity. This study presents an approach for operationalising an image of the past.  相似文献   
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