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Dynamic response to impulsive loads ...

Tsay, Huoy-Shyi.

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Dynamic response to impulsive loads of structures composed of poroelastic materials.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Dynamic response to impulsive loads of structures composed of poroelastic materials./
Author:	Tsay, Huoy-Shyi.
Description:	145 p.
Notes:	Source: Dissertation Abstracts International, Volume: 51-08, Section: B, page: 4022.
Contained By:	Dissertation Abstracts International51-08B.
Subject:	Geotechnology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9101057

Dynamic response to impulsive loads of structures composed of poroelastic materials.
Tsay, Huoy-Shyi.

Dynamic response to impulsive loads of structures composed of poroelastic materials. - 145 p.

Source: Dissertation Abstracts International, Volume: 51-08, Section: B, page: 4022.

Thesis (Ph.D.)--University of Delaware, 1990.

In this study, the response of one dimensional poroelastic structures to arbitrary loading is analytically determined, and this response is characterized by the dynamic transfer functions in Laplace and frequency domains. These transfer functions are obtained by solving Biot's dynamic poroelastic equations for the case of impulsive loading with appropriate boundary conditions. Time domain response to arbitrary time dependent loading is then obtained using these transfer functions.Subjects--Topical Terms:

1018558
Geotechnology.

Dynamic response to impulsive loads of structures composed of poroelastic materials.
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035 $a (UMI)AAI9101057
035 $a AAI9101057
040 $a UMI $c UMI
100 1 $a Tsay, Huoy-Shyi. $3 1685280
245 1 0 $a Dynamic response to impulsive loads of structures composed of poroelastic materials.
300 $a 145 p.
500 $a Source: Dissertation Abstracts International, Volume: 51-08, Section: B, page: 4022.
500 $a Professor in Charge: Herbert B. Kingsbury.
502 $a Thesis (Ph.D.)--University of Delaware, 1990.
520 $a In this study, the response of one dimensional poroelastic structures to arbitrary loading is analytically determined, and this response is characterized by the dynamic transfer functions in Laplace and frequency domains. These transfer functions are obtained by solving Biot's dynamic poroelastic equations for the case of impulsive loading with appropriate boundary conditions. Time domain response to arbitrary time dependent loading is then obtained using these transfer functions.
520 $a The complex dynamic stiffness functions (CDSFs) for six simple one dimensional structures are first obtained. The structures examined are an infinite poroelastic slab, an infinitely long poroelastic circular cylinder, and a poroelastic sphere, each with permeable and impermeable surfaces. The effects of the dissipation coefficient, the coupling mass density, as well as solid and fluid properties on the CDSFs are investigated. Using the CDSF of an infinite poroelastic slab with permeable surface, time domain responses to a step function and a half-sine impulsive function loadings are then derived.
520 $a Next, the transmissibility of a complex structure consisting of a rigid and permeable slab supported by a poroelastic layer is obtained. Using the CDSF of the poroelastic layer, a lumped mechanical model representing the dynamic behavior of the complex structure is proposed. The frequency range in which this model is applicable is then examined. A design optimization study is presented which shows how poroelastic material can be adjusted to minimize the amplitude of dynamic response. Finally, the impulsive response of this structure in time domain is obtained.
520 $a The CDSF results show that when frequencies are higher than the fundamental resonant frequency of a poroelastic material specimen, neglecting the intertia terms or the dissipation terms in Biot's dynamic poroelastic equations provides inaccurate prediction. However, with frequencies lower than this frequency, Biot's quasi-static theory provides accurate results. When frequencies are lower than three-tenths of the fundamental resonant frequency of a poroelastic material, the CDSF obtained for the poroelastic material can be directly employed in a linear lumped mechanical model for a structure composed of this poroelastic material. Changes on the solid and fluid phase material properties change the magnitude of the dynamic stiffness at any frequency. Such changes also affect the maximum value of the loss tangent and the frequency at which it occurs. It is shown that damping at a given frequency can often be increased more by either changing the solid phase properties or by employing a less viscous, but different, fluid, than by increasing the fluid viscosity. This study of impulsive response represents the first time that the effects of the coupling mass density on the dynamic behaviour of poroelastic materials has been quantified.
590 $a School code: 0060.
650 4 $a Geotechnology. $3 1018558
650 4 $a Engineering, Civil. $3 783781
650 4 $a Engineering, Mechanical. $3 783786
690 $a 0428
690 $a 0543
690 $a 0548
710 2 $a University of Delaware. $3 1017826
773 0 $t Dissertation Abstracts International $g 51-08B.
790 1 0 $a Kingsbury, Herbert B., $e advisor
790 $a 0060
791 $a Ph.D.
792 $a 1990
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9101057