Home  About us  Contact
 

Wiley Sons (wiley + son)

Distribution by Scientific Domains
Engineering77%
Mathematics and Statistics22%

Kinds of Wiley Sons

  • john wiley son
    		•

    Selected Abstracts

    A yield displacement distribution-based approach for strength assignment to lateral force-resisting elements having strength dependent stiffness

    EARTHQUAKE ENGINEERING AND STRUCTURAL DYNAMICS, Issue 15 2003
    W. K. Tso
    Abstract Recent studies have shown that for many lateral force-resisting elements (LFRE) stiffness is dependent on strength, and as a result strength assignment to these elements would affect both the strength and stiffness distributions in a structure. Consequently, stiffness distribution cannot be considered known prior to strength assignment. This paper presents a yield displacement distribution-based strength assignment strategy that does not require the knowledge of stiffness distribution prior to strength assignment. It is shown that structural systems with their center of rigidity (CR) and center of strength (CV) located on the opposite sides of the center of mass (CM) will have small torsional responses under seismic excitation. Copyright © 2003 John Wiley Sons, Ltd. [source]

    Consistency of dynamic site response at Port Island

    EARTHQUAKE ENGINEERING AND STRUCTURAL DYNAMICS, Issue 6 2001
    Laurie G. Baise
    Abstract System identification (SI) methods are used to determine empirical Green's functions (EGF) for soil intervals at the Port Island Site in Kobe, Japan and in shake table model tests performed by the Port and Harbor Research Institute (PHRI) to emulate the site during the 17 January 1995 Hyogo-ken Nanbu earthquake. The model form for the EGFs is a parametric auto-regressive moving average (ARMA) model mapping the ground motions recorded at the base of a soil interval to the top of that interval, hence capturing the effect of the soil on the through-passing wave. The consistency of site response at Port Island before, during, and after the mainshock is examined by application of small motion foreshock EGFs to incoming ground motions over these time intervals. The prediction errors (or misfits) for the foreshocks, the mainshock, and the aftershocks, are assessed to determine the extent of altered soil response as a result of liquefaction of the ground during the mainshock. In addition, the consistency of soil response between field and model test is verified by application of EGFs calculated from the shake table test to the 17 January input data. The prediction error is then used to assess the consistency of behaviour between the two cases. By using EGFs developed for small-amplitude foreshock ground motions, ground motions were predicted for all intervals of the vertical array except those that liquefied with small error. Analysis of the post-liquefied ground conditions implies that the site response gradually returns to a pre-earthquake state. Site behaviour is found to be consistent between foreshocks and the mainshock for the native ground (below 16 m in the field) with a normalized mean square error (NMSE) of 0.080 and a peak ground acceleration (PGA) of 0.5g. When the soil actually liquefies (change of state), recursive models are needed to track the variable soil behaviour for the remainder of the shaking. The recursive models are shown to demonstrate consistency between the shake table tests and the field with a NMSE of 0.102 for the 16 m to surface interval that liquefied. The aftershock ground response was not modelled well with the foreshock EGF immediately after the mainshock (NMSE ranging from 0.37 to 0.92). One month after the mainshock, the prediction error from the foreshock modeled was back to the foreshock error level. Copyright © 2001 John Wiley Sons, Ltd. [source]

    A method to solve the multilayer non-continuity problem for heat and moisture transfer in building structures

    INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING, Issue 12 2003
    X. Su
    Abstract In this paper a finite-difference method is proposed for the first time for the solution of coupled heat and moisture transfer problems of transient nature in 1-D multilayer building elements. Transient boundary conditions are specified for both heat and moisture transfer at external surfaces, while constant values are assumed for material properties of each layer of the structure. The calculations for a typical three layers wall are conducted to obtain the dynamic distributions of the relative humidity at the interfaces of every layer during 24 h by use of the mentioned method, and the results agree with the transfer function method in (ASHRAE Trans. 1999; 105(2) : 954,961). The method can be extended to 2-D and 3-D coupled heat and moisture transfer problems. Copyright © 2003 John Wiley Sons, Ltd. [source]

    Investigation of nanoscale electrohydrodynamic transport phenomena in charged porous materials

    INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, Issue 14 2005
    P. Pivonka
    Abstract Depending on the permeability of porous materials, different mass transport mechanisms have to be distinguished. Whereas mass transport through porous media characterized by low permeabilities is governed by diffusion, mass transport through highly permeable materials is governed by advection. Additionally a large number of porous materials are characterized by the presence of surface charge which affects the permeability of the porous medium. Depending on the ion transport mechanism various phenomena such as co-ion exclusion, development of diffusion,exclusion potentials, and streaming potentials may be encountered. Whereas these various phenomena are commonly described by means of different transport models, a unified description of these phenomena can be made within the framework of electrohydrodynamics. In this paper the fundamental equations describing nanoscale multi-ion transport are given. These equations comprise the generalized Nernst,Planck equation, Gauss' theorem of electrostatics, and the Navier,Stokes equation. Various phenomena such as the development of exclusion potentials, diffusion,exclusion potentials, and streaming potentials are investigated by means of finite element analyses. Furthermore, the influence of the surface charge on permeability and ion transport are studied in detail for transient and steady-state problems. The nanoscale findings provide insight into events observed at larger scales in charged porous materials. Copyright © 2005 John Wiley Sons, Ltd. [source]

    Parallel multipole implementation of the generalized Helmholtz decomposition for solving viscous flow problems

    INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, Issue 11 2003
    Mary J. Brown
    Abstract The evaluation of a domain integral is the dominant bottleneck in the numerical solution of viscous flow problems by vorticity methods, which otherwise demonstrate distinct advantages over primitive variable methods. By applying a Barnes,Hut multipole acceleration technique, the operation count for the integration is reduced from O(N2) to O(NlogN), while the memory requirements are reduced from O(N2) to O(N). The algorithmic parameters that are necessary to achieve such scaling are described. The parallelization of the algorithm is crucial if the method is to be applied to realistic problems. A parallelization procedure which achieves almost perfect scaling is shown. Finally, numerical experiments on a driven cavity benchmark problem are performed. The actual increase in performance and reduction in storage requirements match theoretical predictions well, and the scalability of the procedure is very good. Copyright © 2003 John Wiley Sons, Ltd. [source]

    A novel approach to the analysis of distributed shear banding in polymer blends

    INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, Issue 5 2003
    K. G. W. Pijnenburg
    Abstract The toughness of glassy polymers can be enhanced by blending with rubber particles. The consensus is that this toughening is due to massive plastic deformation of the matrix that takes place once the particles have cavitated. Micromechanical studies of regular stackings of particles in a polymer matrix have provided much insight into the localized plastic flow in blends at the microscale of individual particles (or voids, once cavitated). Even some steps towards macroscopic constitutive models have been made. However, at intermediate length scales (i.e. larger than several particles, but smaller than the scale at which the material may be regarded as homogeneous) the situation is unclear. It is this length scale that becomes important around crack tips, for example, where a thorough understanding of the toughening effect has to be derived from. In this paper, we therefore present a novel approach to the analysis of distributed shear banding in polymer,rubber blends. A coarse-grain description, in which much of the morphology is retained but the local shear banding is idealized into ,shear surfaces', will enable us to analyse ensembles with large numbers of particles. The parameters of this model will be validated with results from detailed cell analyses. Copyright © 2003 John Wiley Sons, Ltd. [source]

    The p -version of the finite element method for three-dimensional curved thin walled structures

    INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, Issue 7 2001
    A. Düster
    Abstract In this paper we present an implementation of a three-dimensional p -version for structural problems of solids with almost arbitrarily curved surfaces. Applying the blending function method, complex structures can often be modelled by a few p -elements, being the basis for a higher order approximation. Numerical examples will demonstrate, that the p -version with anisotropic Ansatz spaces allows to predict the structural behaviour of three-dimensional plates and shells with approximately the same amount of degrees of freedom as in the two-dimensional case, yet significantly more accurate due to the three-dimensional model. Furthermore, it is advantageous to compute complex structures exclusively with three-dimensional discretizations as no special elements are needed to model the transition from dimensionally reduced formulations like plates or shells to fully three-dimensional solid elements. Using the p -version with anisotropic Ansatz spaces the whole structure can be efficiently discretized with solid elements, even if the aspect ratio of the elements becomes very large. Copyright © 2001 John Wiley Sons, Ltd. [source]

    The infinitesimal rigid displacement lemma in Lipschitz co-ordinates and application to shells with minimal regularity

    MATHEMATICAL METHODS IN THE APPLIED SCIENCES, Issue 11 2004
    Sylvia Anicic
    Abstract We establish a version of the infinitesimal rigid displacement lemma in curvilinear Lipschitz co-ordinates. We give an application to linearly elastic shells whose midsurface and normal vector are both Lipschitz. Copyright © 2004 John Wiley Sons, Ltd. [source]

    Properties of Hadamard product of inverse M -matrices

    NUMERICAL LINEAR ALGEBRA WITH APPLICATIONS, Issue 4 2004
    Chuansheng Yang
    Abstract This paper concerns with the properties of Hadamard product of inverse M -matrices. Structures of tridiagonal inverse M -matrices and Hessenberg inverse M -matrices are analysed. It is proved that the product A , AT satisfies Willoughby's necessary conditions for being an inverse M -matrix when A is an irreducible inverse M -matrix. It is also proved that when A is either a Hessenberg inverse M -matrix or a tridiagonal inverse M -matrix then A , AT is an inverse M -matrix. Based on these results, the conjecture that A , AT is an inverse M -matrix when A is an inverse M -matrix is made. Unfortunately, the conjecture is not true. Copyright © 2004 John Wiley Sons, Ltd. [source]