摘要:

AbstractThe axisymmetric elastic response of circular footings and anchor plates in a linearly non‐homogeneous elastic soil is analysed. It is assumed that footings/anchors are flexible and subjected to axisymmetric vertical loads. The response of the footing/anchor is modelled by using the classical Poisson–Kirchhoff thin plate theory. A variational technique is used to analyse the interaction problem. A representation for the contact stress is established by using a fundamental solution corresponding to a unit vertical pressure acting over an annular region in the interior of the non‐homogeneous soil. The fundamental solution can be derived by using rigorous analytical procedures. The influence of the footing flexibility and the degree of soil non‐homogeneity on the displacements, bending moments and contact stresses of a surface footing is examined over a wide range of governing parameters. In the case of anchor plates the influence of depth of embedment, degree of soil non‐homogeneity and anchor flexibility on the anchor displacement is inv

ISSN:0363-9061    

DOI:10.1002/nag.1610150702

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

摘要:

AbstractBiot's equations of wave propagation through fluid‐saturated porous elastic media are discretized spatially using the finite element method in conjunction with Galerkin's procedure. Laplace transformation of the discretized equations is used to suppress the time variable. Introducing Laplace transforms of constituent velocities at nodal points as additional variables, the quadratic set of equations in the Laplace transform parameter is reduced to a linear form. The solution in the Laplace transform space is inverted, term by term, to get the complete time history of the solid and fluid displacements and velocities. Since the solution is exact in the time domain, the error in the calculated response is entirely due to the spatial approximation. The procedure is applied to one‐dimensional wave propagation in a linear elastic material and in a fluid‐saturated elastic soil layer with ‘weak’, ‘strong’ as well as ‘moderate’ coupling. With refinement of the spatial mesh, convergence to the exact solution is established. The procedure can provide a useful benchmark for validation of approximate temporal discretization schemes and estimation of errors due to spati

ISSN:0363-9061    

DOI:10.1002/nag.1610150703

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

摘要:

AbstractA numerical method is described for the analysis of axially loaded vertical piles and pile groups embedded in layered soil. The ‘hybrid’ approach is utilized whereby the single‐pile response is represented by load‐transfer (t–z) curves while the pile–soil–pile interaction is obtained accurately using the analytical solutions of Chanet al.for a two‐layered system and in an approximate manner for a Gibson soil. For the single‐pile response a simple rational procedure is suggested for the determination of the averagedrmvalue (radial distance at which the shear stress becomes negligible). Solutions are presented and compared with the elastic continuum solutions for such soil profiles. Finally, comparisons with actual field measurements of vertical piles and pile groups embedded in such a soil profile show fav

ISSN:0363-9061    

DOI:10.1002/nag.1610150704

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

摘要:

AbstractA deep‐based (i.e. deeply buried) structure subjected to stress wave loading is analyzed probabilistically. The finite element method, coupled with a fast probability integration technique, is used to perform the analysis. Randomness due to uncertainties in loading and stratum material properties is addressed. The results presented, although for an idealized linear elastodynamic problem, clearly demonstrate that more realistic probabilistic analyses of impulsively loaded deep‐base structures are feasi

ISSN:0363-9061    

DOI:10.1002/nag.1610150705

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

ISSN:0363-9061    

DOI:10.1002/nag.1610150706

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

ISSN:0363-9061    

DOI:10.1002/nag.1610150707

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

ISSN:0363-9061    

DOI:10.1002/nag.1610150701

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY