The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform

Gianpiero Russo - One of the best experts on this subject based on the ideXlab platform.

  • A method to compute the non-linear behaviour of piles under Horizontal Loading
    Soils and Foundations, 2016
    Co-Authors: Gianpiero Russo
    Abstract:

    Abstract The empirical evidence for vertical piles under Horizontal or lateral Loading is firstly reviewed. The load–deflection relationship is nonlinear from the early stages of Loading, while the load–moment relationship is nearly linear. Moving from the available experimental evidence, typical design issues are addressed and a validation of the widespread Broms’ method is then carried out. To predict the pile–soil interaction, a computer code, NAPHOL, based on a hybrid BEM approach, is fully presented and discussed. A limiting pressure profile, coupled with a cut-off procedure, allows the method to cope with the nonlinear behaviour. Simple guidelines and equations, to calibrate the model parameters, are derived on the basis of the back-analysis of a significant number of case histories. The program is finally used to throw light on the mechanism of the pile–soil interaction under Horizontal Loading.

Fumio Tatsuoka - One of the best experts on this subject based on the ideXlab platform.

  • vertical and Horizontal Loading tests on full scale preloaded and prestressed geogrid reinforced soil structures
    Soils and Foundations, 2005
    Co-Authors: Taro Uchimura, Yukihiko Tamura, Masaru Takeyama, Ikuo Tanaka, Fumio Tatsuoka
    Abstract:

    ABSTRACT The performance of a preloaded and prestressed (PLPS) geogrid-reinforced soil pier constructed for a railway was evaluated by vertical Loading tests performed after a service period of about 3.5 years. The performance was compared with those at the preLoading stage during construction as well as during service. The test results confirmed that the high performance of the pier (i.e., very small transient deformation during train passing and substantially small residual deformation by long-term traffic load during service) can be attributed to the preLoading and prestressing procedure. Horizontal Loading tests were performed simultaneously on the top RC blocks on the preloaded-prestressed pier and the geogrid-reinforced soil abutment, which was constructed without the PLPS procedure for the same bridge. The results showed that the pier was substantially more stable against over-turning moment and Horizontal shear load than the abutment, indicating that the PLPS procedure is also very effective to achieve a high seismic stability.

Ali Bouafia - One of the best experts on this subject based on the ideXlab platform.

  • Single piles under Horizontal loads in sand: determination of P–Y curves from the prebored pressuremeter test
    Geotechnical and Geological Engineering, 2007
    Co-Authors: Ali Bouafia
    Abstract:

    Lateral load-deflection behaviour of single piles is often analysed in practice on the basis of methods of load-transfer P – Y curves. The paper is aimed at presenting the results of the interpretation of five full-scale Horizontal Loading tests of single instrumented piles in two sandy soils, in order to define the parameters of P – Y curves, namely the initial lateral reaction modulus and the lateral soil resistance, in correlation with the pressuremeter test parameters. P – Y curve parameters were found varying as a power of lateral pile/soil stiffness, on the basis of which hyperbolic P – Y curves in sand were proposed. The predictive capabilities of the proposed P – Y curves were assessed by predicting the soil/pile response in full-scale tests as well as in centrifuge tests and a very good agreement was found between the computed deflections and bending moments, and the measured ones. Small-sized database of full-scale pile Loading tests in sand was built and a comparative study of some commonly used P – Y curve methods was undertaken. Moreover, it was shown that the load-deflection curves of these test piles may be normalised in a practical form for an approximate evaluation of pile deflection in a preliminary stage of pile design. At last, a parametric study undertaken on the basis of the proposed P – Y curves showed the significant influence of the lateral pile/soil stiffness on the non-linear load-deflection response.

  • Single piles under Horizontal loads in sand: determination of P – Y curves from the prebored pressuremeter test
    Geotechnical and Geological Engineering, 2006
    Co-Authors: Ali Bouafia
    Abstract:

    Lateral load-deflection behaviour of single piles is often analysed in practice on the basis of methods of load-transfer P–Y curves. The paper is aimed at presenting the results of the interpretation of five full-scale Horizontal Loading tests of single instrumented piles in two sandy soils, in order to define the parameters of P–Y curves, namely the initial lateral reaction modulus and the lateral soil resistance, in correlation with the pressuremeter test parameters. P–Y curve parameters were found varying as a power of lateral pile/soil stiffness, on the basis of which hyperbolic P–Y curves in sand were proposed. The predictive capabilities of the proposed P–Y curves were assessed by predicting the soil/pile response in full-scale tests as well as in centrifuge tests and a very good agreement was found between the computed deflections and bending moments, and the measured ones. Small-sized database of full-scale pile Loading tests in sand was built and a comparative study of some commonly used P–Y curve methods was undertaken. Moreover, it was shown that the load-deflection curves of these test piles may be normalised in a practical form for an approximate evaluation of pile deflection in a preliminary stage of pile design. At last, a parametric study undertaken on the basis of the proposed P–Y curves showed the significant influence of the lateral pile/soil stiffness on the non-linear load-deflection response.

Annan Zhou - One of the best experts on this subject based on the ideXlab platform.

  • Fictitious pile method for fixed-head pile groups subjected to Horizontal Loading
    Soils and Foundations, 2020
    Co-Authors: Ming Cao, Annan Zhou
    Abstract:

    Abstract A novel fictitious pile method based on the elastic theory is presented for the analysis of Horizontally loaded pile groups. By considering the strengthening effect of intervening piles, the interaction between the piles and the soil is decomposed into the extended soil and fictitious piles. The proposed approach is based on the superposition of the Horizontal displacement of individual piles. It enables the avoidance of a full analysis of pile groups, and thus, improves the calculation efficiency. The pile-to-pile interaction factors, Horizontal load distributions, and group efficiency factors produced by the proposed method are very close to those calculated by the finite element method. Several examples are then presented to discuss the influence of nondimensionalized piles and soil parameters on the behavior of pile groups.

Lars Bo Ibsen - One of the best experts on this subject based on the ideXlab platform.

  • A Similitude Theory for Bucket Foundations Under Monotonic Horizontal Load in Dense Sand
    Geotechnical and Geological Engineering, 2012
    Co-Authors: Aligi Foglia, Lars Bo Ibsen
    Abstract:

    This paper aims at finding force-displacement relationships to be employed in the design of bucket foundations for offshore wind turbine. This is accomplished by combining small-scale tests and element tests within a theoretical framework. A similitude theory, regarding the lateral displacement of bucket foundations under Horizontal load, is put forward. A constitutive law of the soil and a load-displacement relationship for the bucket foundation are theoretically obtained. Triaxial tests of sand, and small-scale tests of bucket foundation, are respectively employed to corroborate the theory. Attention is given to the different behaviour shown during the compressive and dilative phases of the soil. Some analogy between triaxial tests and tests of bucket foundation are pointed out. A theoretically derived power law is found capable to represent the dimensionless Horizontal load-displacement curves of experimental results. In accordance with the theory, the exponent of the power law slightly varies between tests with considerably different features. The non-dimensional moment-rotation relationship is represented by a power law as well. The approach is considered valid for fatigue design. The study may be an interesting source for further researches on long-term cyclic Horizontal Loading.