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A simplified design approach for modelling shear force demand on tower walls supported on a transfer structure in regions of lower seismicity

  • Yacoubian, Mehair;Lam, Nelson;Lumantarna, Elisa;Wilson, John L.
    • Earthquakes and Structures
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    • v.15 no.1
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    • pp.97-111
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    • 2018
  • Buildings featuring a transfer structure can be commonly found in metropolitan cities situated in regions of lower seismicity. A transfer structure can be in the form of a rigid plate or an array of deep girders positioned at the podium level of the building to support the tower structure of the building. The anomalous increase in the shear force demand on the tower walls above the podium is a major cause for concern. Design guidance on how to quantify these adverse effects is not available. In this paper a simplified method for quantifying the increase in the shear force demand on the tower walls is presented. In view of the very limited ductile nature of this type of construction the analysis presented herein is based on linear elastic behaviour.

Region Identification on a Trained Growing Self-Organizing Map for Sequence Separation between Different Phylogenetic Genomes

  • Reinhard, Johannes;Chan, Chon-Kit Kenneth;Halgamuge, Saman K.;Tang, Sen-Lin;Kruse, Rudolf
    • Proceedings of the Korean Society for Bioinformatics Conference
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    • 2005.09a
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    • pp.124-129
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    • 2005
  • The Growing Self-Organizing Map (GSOM), an extended type of the Self-Organizing Map, is a widely accepted tool for clustering high dimensional data. It is also suitable for the clustering of short DNA sequences of phylogenetic genomes by their oligonucleotide frequency. The GSOM presents the result of the clustering process visually on a coloured map, where the clusters can be identified by the user. This paper describes a proposal for automatic cluster detection on this map without any participation by the user. It has been applied with good success on 20 different data sets for the purpose of species separation.

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Corrections for effects of biaxial stresses in annealed glass

  • Nurhuda, Ilham;Lam, Nelson T.K.;Gad, Emad F.;Calderone, Ignatius
    • Structural Engineering and Mechanics
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    • v.39 no.3
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    • pp.303-316
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    • 2011
  • Experimental tests have shown that glass exhibits very different strengths when tested under biaxial and uniaxial conditions. This paper presents a study on the effects of biaxial stresses on the notional ultimate strength of glass. The study involved applying the theory of elasticity and finite element analysis of the Griffith flaw in the micro scale. The strain intensity at the tip of the critical flaw is used as the main criterion for defining the limit state of fracture in glass. A simple and robust relationship between the maximum principal stress and the uniaxial stress to cause failure of the same glass specimen has been developed. The relationship has been used for evaluating the strength values of both new and old annealed glass panels. The characteristic strength values determined in accordance with the test results based on 5% of exceedance are compared with provisions in the ASTM standard.

Behaviour of Multi-Storey Prefabricated Modular Buildings under seismic loads

  • Gunawardena, Tharaka;Ngo, Tuan;Mendis, Priyan
    • Earthquakes and Structures
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    • v.11 no.6
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    • pp.1061-1076
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    • 2016
  • Prefabricated Modular Buildings are increasingly becoming popular in the construction industry as a method to achieve financially economical buildings in a very short construction time. This increasing demand for modular construction has expanded into multi-storey applications where the effect of lateral loads such as seismic loads becomes critical. However, there is a lack of detailed scientific research that has explored the behaviour of modular buildings and their connection systems against seismic loads. This paper will therefore present the nonlinear time history analysis of a multi-storey modular building against several ground motion records. The critical elements that need special attention in designing a modular building in similar seismic conditions is discussed with a deeper explanation of the behaviour of the overall system.

Compressive rheology of aggregated particulate suspensions

  • Gladman Brendan;Usher Shane P.;Scales Peter J.
    • Korea-Australia Rheology Journal
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    • v.18 no.4
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    • pp.191-197
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    • 2006
  • The measurement of the compressional rheological parameters for an aggregated particulate suspension is described. The parameters include the compressive yield stress and hindered settling function, describing the extent and rate of dewatering respectively. The variation of these parameters with shear rate and time of shear is also considered in the light of their sensitivity to low shear rates, with particular reference to the case of flocculated particulate suspensions. The latter is seen to be important in the future development of a comprehensive understanding of compressive rheology of aggregated particulate suspensions in industrial applications such as thickening, filtration and centrifugation.

Overturning of precast RC columns in conditions of moderate ground shaking

  • Kafle, Bidur;Lam, Nelson T.K.;Lumantarna, Elisa;Gad, Emad F.;Wilson, John L.
    • Earthquakes and Structures
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    • v.8 no.1
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    • pp.1-18
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    • 2015
  • A simple method of assessing the risk of overturning of precast reinforced concrete columns is presented in this paper. The displacement-based methodology introduced herein is distinguished from conventional force-based codified methods of aseismic design of structures. As evidenced by results from field tests precast reinforced concrete columns can be displaced to a generous limit without sustaining damage and then fully recover from most of the displacement afterwards. Realistic predictions of the displacement demand of such (rocking) system in conjunction with the displacement capacity estimates enable fragility curves for overturning to be constructed. The interesting observation from the developed fragility curves is that the probability of failure of the precast soft-storey column decreases with increasing size of the column importantly illustrating the "size effect" phenomenon.

Azygos and right superior intercostal vein injury secondary to blunt trauma: a case report

  • Nima Yaftian;Benjamin Dunne;Phillip Antippa
    • Journal of Trauma and Injury
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    • v.36 no.1
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    • pp.53-55
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    • 2023
  • Azygos vein injuries are rare consequences of blunt trauma. When there is high drainage output from a right-sided intercostal catheter, an azygos injury must be considered in the differential diagnosis. We report the case of a 38-year-old male patient involved in a fall from a height during a motorcycle accident. Computed tomography demonstrated a large right-sided hemothorax and left-sided pneumothorax. The patient was transferred to the operating theatre and underwent a clamshell thoracotomy. A laceration in the azygos vein at the confluence of the arch of the azygos and the right superior intercostal vein was identified. Bleeding was controlled at the trifurcation. The patient survived and was discharged home on postoperative day 15.

Government's Roles in Public Private Partnership Toll Road Projects

  • Rohman, Mohammad Arif;Doloi, Hemanta;Heywood, Christopher
    • International conference on construction engineering and project management
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    • 2015.10a
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    • pp.381-385
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    • 2015
  • This research aims to investigate critical factors of the government's role in achieving success in Public Private Partnership (PPP) toll road projects in Indonesia according to government and private sectors' perceptions. A preliminary interview Subsequently a questionnaire survey was also conducted involving 143 respondents across the two sectors from eight operating toll were five critical factors of the government's roles in achieving success in PPP toll road projects, namely; "Active involvement in overall project stage activities", "Establishment of good bureaucracy", "Provision of conducive environment", "Appropriate project planning and competitive tendering" and "Provision of appropriate government support and supervision". This research finding is expected to assist the government in defining clear roles and underlying responsibilities in development of PPP toll roads in Indonesia.

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Deformation and Break-up of a Drop in Contraction Flow

  • Davidson Malcolm R.;Cooper-White Justin
    • 한국전산유체공학회:학술대회논문집
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    • 2003.10a
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    • pp.17-18
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    • 2003
  • Drop deformation in a cylindrical contraction geometry, characterized here by the formation of a thread of drop fluid in the contraction, is predicted using a Volume-of-Fluid numerical technique. The predicted drop shape is found to closely follow the observed deformation. A capillary instability in the developing drop thread in the contraction was predicted, in agreement with experimental observation.

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