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Soil Uncertainties on Performance of Geotechnical Works

Journal of Civil Engineering and Architecture 2010年第5期4卷 37-47页

作者： michele maugeri salvatore grasso Department of Civil and Environmental Engineering University of Catania Catania 95125 Italy

Performance-Based Design （PBD） is a more rational approach, particularly in seismic environments. In this approach it is relevant the performance required to structures and to geotechnical works, as well as the geotechnical constitutive models used to predict the performance. The parameters of the constitutive models are related in turn to soil properties. So soil properties are a key point for Performance-Based Design. Questions arising are：（i） which are the more relevant soil properties to solve a specific PBD geotechnical problem？（ii） which are the more relevant model parameters and how they can be evaluated and/or correlated to soil properties？（iii） which is the role of the soil parameters uncertainty in Performance-Based Design？ An answer to these questions is given in this paper, outlining the potential offered by the new advanced in-situ and laboratory tests and discussing the performance required by some geotechnical works.

关键词： Performance Based Design (PBD) soil properties geotechnical works physical environment.

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Soil Liquefaction Hazard Evaluation by the New Seismic Dilatometer Marchetti Test （SDMT）

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Journal of Civil Engineering and Architecture 2010年第3期4卷 36-45页

作者： salvatore grasso michele maugeri Department of Civil and Environmental Engineering University of Catania Italy

Soil liquefaction, and the permanent deformations that frequently result from it, have caused significant damage in past earthquakes. The procedures used in contemporary geotechnical earthquake engineering practice are generally based on simplified procedures for the evaluation of the liquefaction potential. The work describes a framework for performance-based earthquake engineering and its use in the development of a performance-based procedure for liquefaction hazard evaluation. The performance-based procedure will be used to show how consistent application of conventional procedures for evaluation of liquefaction potential can influence performance prediction. Implications for liquefaction-resistant design will also be discussed. The purpose is to summarize current procedures for practical prediction of liquefaction behavior, to describe recent advances in the understanding of liquefaction behavior, and to describe the incorporation of this improved understanding into new solutions for detailed modeling of soil liquefaction, Simplified procedures for evaluation of liquefaction hazards will be reviewed relatively briefly, with more details devoted to emerging knowledge about the mechanics of liquefiable soil behavior, and methods for incorporating those mechanics into improved models for performance prediction. In particular it focuses about the influence on the evaluation of Cyclic Resistance Ratio （CRR） by different in-situ tests （Cone Penetration Test （CPT）. Standard Penetration Test （SPT） and Seismic Dilatometer Marchetti Test （SDMT）） and by different shear waves velocity measurements （Down Hole D-H. Cross Hole C-H, Seismic Dilatometer Marchetti Test SDMT）.

关键词： Liquefaction Potential Index Seismic Dilatometer Marchetti Test (SDMT) Cyclic Resistance Ratio (CRR) Cyclic Stress Ratio (CSR).

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The Role of Soil Investigation on Performance-based Design in Geotechnical Earthquake Engineering

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Journal of Civil Engineering and Architecture 2010年第2期4卷 33-40页

作者： Antonio Cavallaro salvatore grasso michele maugeri Department of Civil and Environmental Engineering University of Catania Catania 95125 Italy

The spatial variability of geotechnical earthquake engineering critical parameters obtained by laboratory and in situ tests in the same area is affected by different measurements. The paper provides a brief synthesis of ground motion and site effects analysis procedures within a Performance-Based Design framework. In particular it focuses about the influence on the evaluation of site effects in some active regions by different shear waves velocity measurements （Down Hole D-H and Seismic Dilatometer Marchetti Test SDMT）. Moreover the variation of shear modulus and damping ratio with strain level and depth from different laboratory dynamic or cyclic tests for soil characterisation （Resonant Column Test RCT） was evaluated. The available data enabled one to compare the shear waves velocity profile obtained by laboratory and in situ tests （Cone Penetration Tests CPT） with empirical correlations proposed in literature.

关键词： Seismic Dilatometer Marchetti Test (SDMT) shear wave velocity St. Giuliano di Puglia (Italy) seismic response analysis.

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Ground Motion and Site Effects on Performance-Based Design

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Journal of Civil Engineering and Architecture 2010年第7期4卷 34-41页

作者： Antonio Ferraro salvatore grasso michele maugeri Department of Civil and Environmental Engineering University of Catania Italy

The objective of Performance-Based Earthquake Engineering （PBEE） is the analysis of performance objectives with a specified annual probability of exceedance. Increasingly undesirable performance is caused by increasing levels of strong ground motion having decreasing annual probabilities of exceedance. The development of this methodology includes three steps：（1） evaluation of the distribution of ground motion at a site; （2） evaluation of the distribution of system response; （3） evaluation of the probability of exceeding decision variables within a given time period, given appropriate damage measures. The work has taken a systematic approach to determine the impact of increasing levels of detail in site characterization on the accuracy of ground motion and site effects predictions. Complementary studies have investigated the use of the following models for evaluating site effects：（1） amplification factors defined on the basis of generalized site categories, （2） one-dimensional ground response analysis, and （3） two-dimensional ground response analysis for surface topography on ground motion. The paper provides a brief synthesis of ground motion and site effects analysis procedures within a Performance-Based Design framework. It focuses about the influence on the evaluation of site effects in some active regions by different shear waves velocity measurements Down Hole （D-H）, Cross Hole （C-H）, Seismic Dilatometer Marchetti Test （SDMT） and by different variation of shear modulus and damping ratio with strain level and depth from different laboratory dynamic tests for soil characterization： Resonant Column Test （RCT）, Cyclic Loading Torsional Shear Test （CLTST）.

关键词： Site effects Performance Based Design (PBD) ground motion soil non-linearity seismic response analysis

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