Dynamic characterization of fine-grained soils in Central Italy by laboratory testing
| Autor: | Giuseppe Lanzo, Anna d’Onofrio, Valentina Lentini, Claudia Madiai, Giorgio Andrea Alleanza, Francesco Castelli, Andrea Ciancimino, Sara Amoroso, Giovanna Vessia, Sebastiano Foti, Roberto Bardotti, Ernesto Cascone, Giovanni Biondi, Anita Di Giulio |
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| Přispěvatelé: | Ciancimino, A., Lanzo, G., Alleanza, G. A., Amoroso, S., Bardotti, R., Biondi, G., Cascone, E., Castelli, F., Giulio, A. D., D'Onofrio, A., Foti, S., Lentini, V., Madiai, C., Vessia, G. |
| Rok vydání: | 2019 |
| Předmět: |
Laboratory test
021110 strategic defence & security studies Damping ratio Hydrogeology Seismic microzonation Consolidation (soil) Shear wave velocity 0211 other engineering and technologies 02 engineering and technology Building and Construction Plasticity Geotechnical Engineering and Engineering Geology Simple shear Soil dynamics Geophysics Seismic hazard Shear (geology) Small-strain material damping Soil dynamics · Laboratory tests · Shear modulus and damping ratio · Smallstrain material damping · Shear wave velocity - Cantral Italy soils Soil dynamics · Laboratory tests · Shear modulus and damping ratio · Small strain material damping · Shear wave velocity Shear modulus and damping ratio Geotechnical engineering Geology Civil and Structural Engineering |
| Zdroj: | Bulletin of Earthquake Engineering. 18:5503-5531 |
| ISSN: | 1573-1456 1570-761X |
| Popis: | The investigation of soil response to dynamic loads is necessary to predict site-specific seismic hazard. This paper presents the results of cyclic and dynamic laboratory tests carried out after the 2016–2017 Central Italy Earthquake sequence, within the framework of the seismic microzonation studies of the most damaged municipalities in the area. The database consists of 79 samples investigated by means of dynamic resonant column tests, cyclic torsional shear tests or cyclic direct simple shear tests. Results are firstly analysed in terms of field and laboratory values of small-strain shear wave velocity, highlighting the influence of the sample disturbance and of the mean effective consolidation pressure. The cyclic threshold shear strains as a function of plasticity index are then compared with findings from the published literature and the outliers are analysed. Subsequently, the dynamic soil behaviour is investigated with reference to the small-strain damping ratio. Differences between results from different tests are analysed in the light of the loading frequencies. Finally, the database is used to develop a predictive model for soil nonlinear curves according to plasticity index, mean effective confining stress, and loading frequency. The model represents a useful tool to predict the nonlinear stress–strain behaviour of Central Italy soils, necessary to perform site-specific ground response analyses. |
| Databáze: | OpenAIRE |
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