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<title>School of Environment, Science and Engineering Papers</title>
<copyright>Copyright (c) 2013 Southern Cross University All rights reserved.</copyright>
<link>http://epubs.scu.edu.au/esm_pubs</link>
<description>Recent documents in School of Environment, Science and Engineering Papers</description>
<language>en-us</language>
<lastBuildDate>Fri, 24 May 2013 01:47:37 PDT</lastBuildDate>
<ttl>3600</ttl>


	
		
	

	
		
	

	
		
	

	
		
	

	
		
	

	
		
	

	
		
	

	
		
	

	
		
	

	
		
	

	
		
	

	
		
	




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<title>CFRP- confined square RC columns. II: Cyclic axial compression stress-strain model</title>
<link>http://epubs.scu.edu.au/esm_pubs/1623</link>
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<pubDate>Wed, 22 May 2013 23:19:07 PDT</pubDate>
<description>
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	<p>For the seismic design of fiber reinforcement polymer (FRP) confined reinforced concrete (RC) columns, the development of an accurate axial stress-strain model that considers cyclic compression is necessary. In light of such a demand, this paper presents a cyclic axial stress-strain model for FRP-confined RC square columns. The model is informed from physical observations and test measurements obtained from an experimental investigation reported in the companion paper, in which FRP-confined square unreinforced and reinforced concrete columns of larger size under varying cyclic axial compression patterns were tested. In the current paper, the proposed stress-strain model is presented and it consists of three main components, namely (1) a monotonic stress-strain model to describe the envelope curve, (2) a polynomial expression for the unloading path, and (3) a straight line for the reloading path. The influence of internal longitudinal and hoop steel reinforcement is also considered in the proposed model, in addition to their influence on the ultimate stress and strain. The accuracy of the model is finally validated with an experimental database compiled of tests reported in the companion paper and other relevant tests extracted from the open literature<br /><br /></p>

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<author>Zhenyu Wang et al.</author>


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<title>Scaled model test for collision between over-height truck and bridge superstructure</title>
<link>http://epubs.scu.edu.au/esm_pubs/1622</link>
<guid isPermaLink="true">http://epubs.scu.edu.au/esm_pubs/1622</guid>
<pubDate>Wed, 22 May 2013 23:04:07 PDT</pubDate>
<description>
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	<p>The frequent occurrence of accidental collisions between over-height trucks and bridge superstructures in recent years has seriously affected the safety of bridge infrastructure and traffic systems in metropolitan areas. Such collisions highlight the importance of scientific research in this field and therefore the performance of three typical bridge superstructures subjected to collision by an over-height truck is studied in this paper through scaled model tests. A steel box girder, a steel plate girder and a reinforced concrete (RC) T-beam girder are adopted to represent different types of bridge girders while a cylindrical tank with counterweight is adopted to represent a typical over-height truck. Finite element simulation is also conducted and the results are compared with the experimental findings. The results obtained by test and simulation are consistent and both of them indicate that under collision conditions local failure is found to be the main failure mode for the steel plate and RC T-beam girders, whilst global failure is found to be the main failure mode for the steel box girder bridge model.</p>

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<author>L J. Xu et al.</author>


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<title>Influence of FRP anchor fan configuration and dowel angle on anchoring FRP plates</title>
<link>http://epubs.scu.edu.au/esm_pubs/1621</link>
<guid isPermaLink="true">http://epubs.scu.edu.au/esm_pubs/1621</guid>
<pubDate>Wed, 22 May 2013 22:36:31 PDT</pubDate>
<description>
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	<p>To enhance the strain capacity of fibre-reinforced polymer (FRP) plates which have been bonded onto reinforced concrete (RC) members for strengthening purposes, FRP anchors can be utilised. Research on the characterisation of FRP anchors is still quite limited though despite the increasing use of FRP anchors in practice. In order to reduce such a knowledge gap, this paper reports the results of 30 single-shear FRP-to-concrete joint tests of which 26 joints were anchored with FRP anchors of differing geometric configurations and four joints were unanchored controls. More specifically for the anchored joints, the connection of the FRP anchor to the FRP plate via so called fan fibres was varied in addition to the angle of anchor insertion and these test parameters represent fundamentally important anchor components which have not been researched to date. Failure modes, joint strengths, load–slip responses as well as FRP plate strain distributions are reported and a relationship relating the influence of anchor insertion angle to joint strength is provided. A maximum increase in joint strength of 160% on average above the unanchored control joints was achieved. In addition, the maximum strain resisted by the FRP plate, relative to its elongation capacity, was increased on average from 25% for unanchored control joints to 67% for some anchored joints.</p>

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<author>H W. Zhang et al.</author>


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<title>Fatigue behaviour of CFRP-repaired corroded RC beams</title>
<link>http://epubs.scu.edu.au/esm_pubs/1620</link>
<guid isPermaLink="true">http://epubs.scu.edu.au/esm_pubs/1620</guid>
<pubDate>Wed, 22 May 2013 22:22:56 PDT</pubDate>
<description>
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	<p>This paper reports the results of an experimental study on the performance of corroded reinforced concrete (RC) beams repaired with carbon fiber-reinforced polymer (CFRP) plates that were subsequently tested in fatigue. In the corroded specimens, the tensile reinforcing bars became more susceptible to fatigue failure than the bars in the noncorroded control beams. The CFRP strengthening prolonged the fatigue life by reducing the stress levels of the tensile reinforcement. The dominant failure of the strengthened beams was by fracture of one or more of the tensile reinforcing bars, followed by debonding of the CFRP plate. While the CFRP delayed the fatigue failure, it did not restore the cyclic resistance of the beams to that of the control specimens. The test beams were analyzed for their fatigue life using current design methods with appropriate allowance for the effects of corrosion of the steel reinforcement.</p>

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<author>Kam Yoke M Loo et al.</author>


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<title>FE modeling of CFRP-repaired RC beams subjected to fatigue loading</title>
<link>http://epubs.scu.edu.au/esm_pubs/1619</link>
<guid isPermaLink="true">http://epubs.scu.edu.au/esm_pubs/1619</guid>
<pubDate>Wed, 22 May 2013 21:44:42 PDT</pubDate>
<description>
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	<p>A constitutive model is developed for fiber-reinforced polymer (FRP)-to-concrete bond for fatigue loading. The model is verified against available test data with a framework developed for further calibration as new data becomes available. The formulation is incorporated into a finite-element program and the fatigue behavior of FRP-repaired reinforced concrete (RC) beams is analyzed. Comparing the finite-element model results with test data shows that the model is capable of accurately predicting the overall cyclic fatigue loading response of RC members strengthened with FRP composites. The model is also able to capture the change in the peak deflection, the FRP plate strain development and distribution with increasing load cycles, and the number of load cycles to failure. The need for more tests on FRP-to-concrete bonded interfaces subjected to fatigue loading is identified, as is the need to measure key modeling parameters from such tests.<br /><br /></p>

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<author>Kam Yoke M Loo et al.</author>


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<title>Effect of FRP-to-steel bonded joint configuration on interfacial stresses: finite element investigation</title>
<link>http://epubs.scu.edu.au/esm_pubs/1618</link>
<guid isPermaLink="true">http://epubs.scu.edu.au/esm_pubs/1618</guid>
<pubDate>Wed, 22 May 2013 21:21:28 PDT</pubDate>
<description>
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	<p><p id="x-x-x-sp0095">Externally bonded fibre-reinforced polymer (FRP) composites can be applied to strengthen and repair existing steel structures. In order to understand and quantify the behaviour of the bonded interface, researchers have conveniently tested FRP-to-steel joint assemblages. Both single- and double-shear joints of varying boundary conditions have been tested to date in which either the steel or FRP components have been loaded. In addition, the material and geometric properties of the joint materials have been varied and such variation in properties and test configuration will cause variation in the distribution and magnitude of interfacial stresses. This study presents the results of finite element simulations of the interfacial stresses of several FRP-to-steel joint configurations considered by researchers to date. Numerical simulations of interfacial stresses are also conducted on an FRP-strengthened I-beam and several key locations are examined in greater detail such as at the plate end, an intermediate fatigue induced crack, and a yielded zone. The beam stresses are compared with the stresses from the joint models and then joint configurations are identified which best capture the interfacial stress distributions at various positions along the length of the beam.</p>

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<author>J Q. Yang et al.</author>


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<title>Postcolonial times: lock the gate or pull down the fences?</title>
<link>http://epubs.scu.edu.au/esm_pubs/1617</link>
<guid isPermaLink="true">http://epubs.scu.edu.au/esm_pubs/1617</guid>
<pubDate>Wed, 22 May 2013 16:46:56 PDT</pubDate>
<description>
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	<p>The development of a rural coal seam gas industry in regional Australia, together with its key technology, fracking, has been met by a very active, lively and vocal social protest movement. This 2013 Tricontinental Lecture in Postcolonial Studies reflects on this protest movement from two perspectives. First, it examines what a postcolonial studies perspective may bring to further understanding the relationships and dynamics between the industry and the protest movement. Secondly, it considers what postcolonial scholars themselves may be able to bring to critiques of social issues such as this environmental contention. The example described in this lecture also reminds us that postcolonial studies concerns more than the three continents of the Tricontinent, Latin America, Africa and Asia, and that it is centrally concerned with access to environmental resources. Building on the history of the 1966 Tricontinental Conference in Havana, and the growth of postcolonial political philosophy and studies that focus on power, equity and access in postcolonial societies, this essay considers the power differentials between industry and government on the one hand, and the protest movement on the other. By examining the role of language and its control, a key social process in the wielding of power, it is shown that the coal seam gas development debate is couched in terms of industrial or governmental language, and not in the language of the community. This has three important consequences. First, opponents are forced to express concerns about technical matters or scientific matters, thus legitimising the proposed activity. Secondly, opponents are not authorised, within the formal sphere, to express their own feelings through their language of social anxiety, of love of the country, of being in the community, of history. Thirdly, both sides find themselves in a typical cross-cultural dilemma: either speak an inadequate form of language that the other party understands but that does not actually express what you mean, or speak your own language and risk the other party not understanding what you mean.</p>
<p>From a postcolonial studies perspective, this example reminds students of two key processes. First, students need to master the intellectual skills of the humanities in order to provide critical analysis of social situations. Secondly, students need to know that, as western scholars, they are as much part of any postcolonial problem as those in power, and therefore need to develop good reflective skills and to learn to think ‘otherwise’.</p>

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<author>Bill E. Boyd</author>


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<title>Anchorage devises used to improve the performance of concrete structures retrofitted with FRP composites: a state-of-the-art review</title>
<link>http://epubs.scu.edu.au/esm_pubs/1616</link>
<guid isPermaLink="true">http://epubs.scu.edu.au/esm_pubs/1616</guid>
<pubDate>Tue, 21 May 2013 23:10:02 PDT</pubDate>
<description>
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	<p>The anchorage of fiber-reinforced polymer (FRP) composites when applied to reinforced concrete (RC) structures as externally bonded reinforcement is an effective means to achieve higher levels of fiber utilization prior to premature debonding failure. Commonly documented anchorage methods for FRP-to-concrete applications demonstrating encouraging results include FRP U-jackets, FRP anchors (also known as spike anchors, among other names), patch anchors (utilizing unidirectional and bidirectional fabrics), nailed metal plates (also known as hybrid bonding), near-surface mounted rods, mechanical fastening, concrete embedment, and mechanical substrate strengthening. Anchorages applied to FRP systems have been verified through experimental testing and numerical modeling to increase the ductility, deformability, and strength of the member and also prevent, delay, or shift the critical mode of FRP debonding failure. Although the benefits of anchorage solutions have now been widely acknowledged by researchers, further studies are required in order to establish reliable design formulations to negate the requirement for ongoing laboratory verification by industry. The present paper is a state-of-the-art review of experimental studies conducted in the area of FRP anchorage systems applied to FRP-strengthened RC flexural members. Available experimental data are compiled and catalogued and an anchorage efficiency factor for each anchorage type under investigation is assigned in order to quantify the anchor’s efficiency. Finally, current shortcomings in knowledge are identified, in addition to areas needing further investigation.<br /><br /></p>

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<author>R Kalfat et al.</author>


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<title>Influence of FRP anchors on the strength and ductility of FRP-strengthened RC slabs</title>
<link>http://epubs.scu.edu.au/esm_pubs/1615</link>
<guid isPermaLink="true">http://epubs.scu.edu.au/esm_pubs/1615</guid>
<pubDate>Tue, 21 May 2013 22:12:05 PDT</pubDate>
<description>
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	<p>Extensive experimental verification has shown that existing reinforced concrete (RC) members can be strengthened with externally bonded fibre-reinforced polymer (FRP) composites. Two well documented limitations to the strengthening technology though are premature FRP debonding failure and non-ductile member behaviour. A recent study by Smith et al. <a href="http://www.sciencedirect.com/science/article/pii/S0950061813001074#b0005" id="x-x-x-ancbb0005">[1]</a> showed anchors made from FRP (also known as FRP anchors) to be effective in delaying debonding and also effective in enhancing the deformability (and ductility) of RC slabs strengthened in flexure with FRP plates. This paper extends the work of Smith et al. by reporting the results of tests on 10 FRP-strengthened RC slabs anchored with FRP anchors of varying geometry and positioning. Optimal arrangements of anchors in this second series of tests have enabled the load and deflection capacities of the FRP-strengthened slabs, in relation to the unanchored but strengthened control slab, to be enhanced by up to 44% and 216%, respectively. Strain utilisation of the FRP plate has also been shown to increase from 44% of the flat coupon strain capacity for the unanchored but strengthened control slab to 95% for an optimally anchored FRP-strengthened slab.</p>

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<author>Scott T. Smith et al.</author>


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<title>Design guidelines for fibre-reinforced polymer (FRP)-strengthened reinforced concrete (RC) structures</title>
<link>http://epubs.scu.edu.au/esm_pubs/1614</link>
<guid isPermaLink="true">http://epubs.scu.edu.au/esm_pubs/1614</guid>
<pubDate>Tue, 21 May 2013 21:35:02 PDT</pubDate>
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<author>J G. Teng et al.</author>


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<title>Flexural strengthening of reinforced concrete (RC) beams with fiber reinforced polymer (FRP) composites</title>
<link>http://epubs.scu.edu.au/esm_pubs/1613</link>
<guid isPermaLink="true">http://epubs.scu.edu.au/esm_pubs/1613</guid>
<pubDate>Tue, 21 May 2013 21:21:27 PDT</pubDate>
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<author>Teng J. G et al.</author>


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<title>Design handbook for RC structures retrofitted with FRP and metal plates: beams and slabs HB 305-2008</title>
<link>http://epubs.scu.edu.au/esm_pubs/1612</link>
<guid isPermaLink="true">http://epubs.scu.edu.au/esm_pubs/1612</guid>
<pubDate>Tue, 21 May 2013 19:04:47 PDT</pubDate>
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<author>Deric John Oehlers et al.</author>


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