The Experts below are selected from a list of 265872 Experts worldwide ranked by ideXlab platform
Nicholas S. Trahair - One of the best experts on this subject based on the ideXlab platform.
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LATERAL BUCKLING STRENGTHS OF STEEL ANGLE SECTION BEAMS
Journal of Structural Engineering-asce, 2003Co-Authors: Nicholas S. TrahairAbstract:The Design of unbraced steel angle section beams against biaxial bending and torsion requires the ability to predict their lateral buckling strengths when bent about the major principal axis. Present Design Code formulations of lateral buckling strength are based on research on doubly symmetric I-section beams, and may be inappropriate for monosymmetric and asymmetric angle section beams. This paper presents close approximations for the elastic lateral buckling moments of equal and unequal angle section beams loaded by uniformly distributed loads which act at or away from the shear center. Small and large twist rotation elastic analyses of angle section beams with initial twist rotations are used with interaction equations for the biaxial bending section moment capacities to investigate present Design Code formulations for lateral buckling strength. It is found that these Code formulations are unnecessarily conservative, especially at high slendernesses, where the moment capacities predicted by them may be less than the minor axis section capacity instead of greater. An improved formulation is proposed which is simpler and more economic than the present formulations. The use of the elastic lateral buckling approximations in the improved Design moment capacity formulation is demonstrated in a worked example.
Yong Wang - One of the best experts on this subject based on the ideXlab platform.
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New model for post-fatigue behaviour of CFRP to concrete bond interface in single shear
Composite Structures, 2017Co-Authors: Raid Daud, Lee Cunningham, Yong WangAbstract:Abstract In this paper, a finite element model using ABAQUS 6.10-1 is developed to simulate the CFRP-to-concrete bonded joint behaviour in single shear pull-out tests. The model adopts the cohesive surface approach and the simulation results are checked against the authors’ test results (monotonic and post-fatigue) in order to demonstrate the accuracy of the model. Parametric studies using the validated model were carried out to investigate the effects of varying the bond length, the thickness of FRP, the type of FRP, the concrete strength, and the bond width ratio. The results were then used to assess the various existing Design Code approaches for predicting the FRP-concrete bond behaviour. The post-fatigue numerical results indicate that the existing Design Code methods all have significant discrepancies. Based on the work conducted a simple and potentially more accurate model for predicting the debonding strain of CFRP plate in single shear is then presented.
C H Juang - One of the best experts on this subject based on the ideXlab platform.
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reliability based Code revision for Design of pile foundations practice in shanghai china
Soils and Foundations, 2015Co-Authors: Jingpei Li, Jie Zhang, C H JuangAbstract:Abstract This paper describes how the Code for the Design of pile foundations in Shanghai, China is revised based on the reliability theory. With quality static load test data, both within-site and cross-site variabilities for Design methods of piles in Shanghai are characterized. It is found that the amount of uncertainties associated with the Design of piles in Shanghai is less than the typical values reported in the literature. With the partial factors specified in the previous Design Code, the reliability indexes of piles Designed with empirical methods are in the range of 3.08–4.64, while those of piles Designed with the load test-based method are in the range of 5.67–5.89. The load factors in the revised local Design Code have been reduced according to the national Design Code. As a result, the resistance factors have been increased in the revised Code based on a combination of a reliability analysis and engineering judgment. In the revised Design Code, the reliability level of piles Designed with the empirical methods is similar to that in the previous Design Code; the reliability level of piles Designed with the load test-based method is lowered to achieve cost-effectiveness. Partial factors have been suggested for side and toe resistances based on the reliability theory considering their relative importance as well as the uncertainties involved.
Raid Daud - One of the best experts on this subject based on the ideXlab platform.
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New model for post-fatigue behaviour of CFRP to concrete bond interface in single shear
Composite Structures, 2017Co-Authors: Raid Daud, Lee Cunningham, Yong WangAbstract:Abstract In this paper, a finite element model using ABAQUS 6.10-1 is developed to simulate the CFRP-to-concrete bonded joint behaviour in single shear pull-out tests. The model adopts the cohesive surface approach and the simulation results are checked against the authors’ test results (monotonic and post-fatigue) in order to demonstrate the accuracy of the model. Parametric studies using the validated model were carried out to investigate the effects of varying the bond length, the thickness of FRP, the type of FRP, the concrete strength, and the bond width ratio. The results were then used to assess the various existing Design Code approaches for predicting the FRP-concrete bond behaviour. The post-fatigue numerical results indicate that the existing Design Code methods all have significant discrepancies. Based on the work conducted a simple and potentially more accurate model for predicting the debonding strain of CFRP plate in single shear is then presented.
Juha Merilä - One of the best experts on this subject based on the ideXlab platform.
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WWW Design Code – a new tool for colour estimation in animal studies
Frontiers in Zoology, 2004Co-Authors: Åsa Berggren, Juha MeriläAbstract:Background The colour of animals' skin, fur, feathers or cuticula has been estimated in a large number of studies. The methods used to do so are diverse, with some being costly and not available to all researchers. In a study to measure plumage colour in a bird species, a new method of creating a colour chart was developed. While colour-charts have their own limitations, these can be minimised when they have the following properties: 1) being readily available to the majority of biologists, 2) containing a large array of colours to allow accurate recording and differentiation of subtle colour differences, 3) low cost, 4) adhering to a world-wide standard, and 5) being available in both hard-copy and digital formats to allow for various analytical methods. The method described below satisfies all of these requirements. Results Colour charts estimated to fit the range of the species' plumage colours were created on the computer screen using web software that allowed for HTML-coding (in this case Dreamweaver™). The charts were adjusted using feathers from dead specimens until a satisfying range of darker and lighter colours were found. The resulting chart was printed out and was successfully used in the field to determine the plumage colour of hand-held birds. Conclusion Access to a computer and printer, and the software to enable the creation of a chart, is within the reach of the vast majority of biologists. The numbers of colours that can be generated should suit most studies, with the advantage of the method being that the chart can be individually tailored to the species under study. HTML colour coding is a worldwide standard, thus the colours used in studies can be described in the methods section of journal articles using the six-digit alphanumeric Code. We believe this method is very useful as a low-tech method for future estimation of individual colour.