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QUAKE SAFE ADOBE Building earthquake safe communities |
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QUAKE SAFE ADOBE Building earthquake safe communities |
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The following papers describe some of the testing undertaken at UTS: Dowling, D.M., Samali, B. and Li, J., (2005) An improved means of reinforcing adobe wall units – external vertical reinforcement, Proceedings of SismoAdobe 2005, Lima, Peru, 16-19 May 2005. Abstract: Traditional adobe (mudbrick) houses are highly susceptible to damage and destruction during seismic events. This vulnerability is particularly acute in developing countries where traditional construction practices and resource limitations result in large stocks of at-risk houses. The current favoured method to improve the earthquake resistance of new adobe houses includes the use of pilasters / buttresses, a crown/ring beam, internal vertical reinforcement (e.g. bamboo, cane, plastic tubing) and internal horizontal reinforcement (e.g. bamboo, cane, wire mesh). Although this method has been observed to significantly delay structural collapse, this paper raises some questions about the capacity of this form of reinforcement to delay the onset of cracking at low intensity ground motions. Furthermore, the complexity of the system is a major obstacle to its widespread use. An alternative system is being developed and tested at the University of Technology, Sydney (UTS), Australia. This system retains the use of a crown/ring beam and internal horizontal reinforcement (wire mesh), however the vertical reinforcement (bamboo) is placed externally and attached to the wall after construction. The bamboo is securely tied to the horizontal and vertical reinforcement and the ring beam, creating a stable matrix. This system can also be slightly modified for the seismic retrofitting / strengthening of existing dwellings. Shake table testing at UTS has shown the system to be an effective means of impeding initial cracking, as well as delaying major structural damage and ultimate collapse. Scale model (1:2) u-shaped wall panels are being subjected to transient dynamic loading using a shake table to evaluate the response to out-of-plane seismic forces. Time-scaled input spectra are being used to induce damaging resonance conditions and the force-displacement characteristics and failure mechanisms of different reinforcement systems are being studied to determine their resistance capacity. This paper presents the results of shake table tests at UTS, as well as providing some discussion on the opportunities and challenges for implementation. File name: SismoAdobe05 Dowling (B) UTS (final).pdf File size: 1,231 KB
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Samali, B., Dowling, D.M. and Li, J., (2004) Dynamic testing of unreinforced u-shaped adobe-mudbrick wall unit, Proceedings of the 18th Australasian Conference on the Mechanics of Structures and Materials, 1-3 December 2004, Perth, Australia, pp. 505-510. Abstract: Traditional adobe (mudbrick) houses are highly susceptible to damage and destruction during seismic events. Vertical corner cracking at the intersection of orthogonal walls is one of the major damage patterns of traditional adobe buildings subject to earthquake forces. There are a number of design and construction features which are considered to be viable means of improving the shear and tearing resistance capacities of corner elements. In order to adequately assess different design improvements a series of tests are being undertaken at the University of Technology, Sydney, Australia. This paper presents the first test in the series: the dynamic shake table testing of an unreinforced u-shaped adobe wall panel (1:2 scale). The paper describes the configuration of the specimen, the development of an appropriate input time history and the resulting damage patterns, which were classic and distinct.
File name: ACMSM 18 (Samali et al).pdf File size: 293 KB
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This document describes the construction and testing process for the reinforced model adobe house 4A. File name: Model house 4A - process (DD).pdf File size: 1,393 KB
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