Influence factors for settlement estimates of footings on finite layers. Technical note

26A effect of increasing the load range in which the system behaved elastically. Two design approaches, limit state analysis and elastic state analysis, are also discussed. 851228 Influence factors for settlement estimates of footings on finite layers. Technical note Taylor, B B; Matyas, E L Can Geotech J V20, N4, Nov 1983, P832-835 The estimation of the settlement of footings on finite layers is examined for values of Poisson's ratio from 0-0.5. Influence factors based on Steinbrenner's approximation are found to be in good agreement with those obtained by the more rigorous evaluation of Giroud. The study confirms the findings of Christian and Carrier that the Janbu, Bjerrum and Kjaernsli chart to estimate elastic settlements is incorrect. 851229 Ultimate capacity of rigid single piles under inclined loads in sand. Technical note Chari, T R; Meyerhof, G G Can Geotech J V20, N4, Nov 1983, 1'849-854 Model tests on a 75mm diameter instrumented pile show that the inclination of the applied load reduces the ultimate capacity of the pile: a reduction of nearly 30% for a 30 deg inclination and about 50% for a 60 deg inclination. 851230 Non-linear dynamic analysis of orthotropic annular plates resting on elastic foundations Nath, Y; Jain, R K Earthq Engng Struct Dynam VII, N6, Nov-Dec 1983, P785796 The non-linear dynamic behaviour of orthotropic annular plates resting on Winkler and Pasternak elastic foundations is studied. Von Karman type non-linear partial differential equations are solved using Chebyshev polynomials in the space domain and implicit Houbolt numerical techniques in the time domain. 851231 Vibration of beams on non-homogeneous elastic foundations Pavlovic, M N; Wylie, G B Earthq Engng Struct Dynam Vl l, N6, Nov-Dec 1983, P797808 The response of a beam or pile supported by an elastic foundation is investigated for the case where the coefficient of subgrade reaction varies linearly along the span of the member. 851232 Negative skin friction on piles: a simplified analysis and prediction procedure Alonso, E E; Josa, A; Lcdesma, A Geotechnique V34, N3, Sept 1984, P341-357 A simple model to compute loads and deformations of single piles subjected to downdrag effects based on the transfer function approach is presented. Simple numerical solution procedures are developed for fairly general conditions, accommodating arbitrary layering and complicated loading sequences. 851233 On the dynamic stiffness of circular ring footings on an elastic stratum Tassoulas, J L: Kauscl, E Int J Num Anal Meth Geomech I/8, N5, Sept-Oct 1984, P411-426

Circular ring footings on an elastic stratum are considered. The static and dynamic stiffnesses are calculated using an efficient numerical technique. The results indicate that the static torsional and rocking stiffnesses of a ring footing do not deviate significantly from the corresponding stiffnesses of the circular footing for values of the inner-radius-to-outer-radius ratio up to about 0.75. The static horizontal and vertical stiffnesses change considerably only for values of this ratio greater than about 0.60. The change in the stiffness and damping coefficients is small for values of the ratio between 0 and 0.5. Auth. 851234 Stresses and displacements in an elastic mass due to distributed loading by discretization technique Sharma, K G; Rao, G V Int J Num Anal Meth Geomech 1"8, N5, Sept-Oct 19~4, P427-444 Numerical solutions using a multi-dimensional numerical integration technique have been obtained for stresses and displacements in a linear elastic half space due to distributed loads of circular, rectangular and elliptical shapes. Comparison with existing analytical solutions indicates a good match, within I°o, for displacements at all depths for the cases studied. The match is also good for stresses, except at shallow depths. 851235 Circular load on elastic layer. Short communication Wood, D M lnt J Num Anal Meth Geomech I/'8. N5, Sept-Oct 196'4, P503-509 Calculates the stresses produced by a uniform circular load in an elastic layer underlain by a rough rigid base. 851236 Finite layer analysis of layered elastic materials using a flexibility approach. Part 1 - strip Ioadings Small, J C; Booker, J R lnt J Num Meth Engng V20. N6, June 1984, P1025-1037 A method to analyse the problem of a uniform strip loading applied to the surface of a multi-layered material is presented. The method uses an exact finite layer flexibility matrix which allows it to be used for incompressible materials. Examples to illustrate the method's use in the geotechnical area are given. 851237 Foundation performance of offshore jack-up drilling rigs Young, A G; Remmes, B D; Meyer, B J J Geoteeh Engng Div ASCE VIIO, NGT7, July 1984. P841859 Over one third of mobile jack-up rig accidents are associated with foundation problems. Foundation failure can be attributed to: (1) punch-through during preload, (2) excessive storm penetration, (3) sea floor instability, (4) footing instability induced by scouring, and (5) inability to extract legs. In order to predict potential foundation problems, a geotechnical investigation preferably supplemented by a geophysical investigation is required. Further refinement of analytical procedures is needed to predict punch-through failures; this is illustrated with 3 case histories. 851238 Stability of Ekofisk tank: reliability analysis Wu, T H; Martinez, R E; Kjekstad, O J Geoteeh Engng Div ASCE VIlO, NGT7, July 1984. P938956 The uncertainties encountered in the stability analysis for the foundation of the Ekofisk Tank are formulated in probabilistic terms and used to evaluate the reliability of the foundation