Marone, Gabriella (2021) Experimental behavior, Analysis and Design of Energy Piles. [Tesi di dottorato]


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Item Type: Tesi di dottorato
Resource language: English
Title: Experimental behavior, Analysis and Design of Energy Piles
Date: 15 July 2021
Number of Pages: 271
Institution: Università degli Studi di Napoli Federico II
Department: Ingegneria Civile, Edile e Ambientale
Dottorato: Ingegneria strutturale, geotecnica e rischio sismico
Ciclo di dottorato: 33
Coordinatore del Corso di dottorato:
Russo, GianpieroUNSPECIFIED
Date: 15 July 2021
Number of Pages: 271
Keywords: Energy Piles, Numerical Analyses, Small scale test, In situ thermal test, Thermomechanical behavior, Thermomechanical pile-soil interaction, FE analyses
Settori scientifico-disciplinari del MIUR: Area 08 - Ingegneria civile e Architettura > ICAR/07 - Geotecnica
Date Deposited: 23 Jul 2021 05:49
Last Modified: 07 Jun 2023 11:21

Collection description

The dissertation deals with the study of pile-soil interaction under coupled thermo-mechanical loadings focusing on the application of energy piles in a specific geographic area and particular subsoil conditions. In service condition energy piles are subjected to combined thermomechanical loads therefore, with respect to pile foundations the effect of the additional thermal loadings have to be considered. Different aspects about this topic are investigated through Finite Element analyses, small scale and in situ tests. A calculation procedure based on the mechanical calibration of soils parameters is presented. Back analyses of three case-histories from literature allowed the validation of the procedure. Then, the results of short term thermo-mechanical coupled analyses along with a sensitivity analysis provide insight about the effect of different parameters on the mechanical response. Dynamic energetic simulations carried out with dedicated software allowed estimating real thermal loadings to be applied to the pile. Additional investigations dealing with the time scaling of thermal variations, the influence of constraint at pile's head and toe and the thermal interaction with the upper structure along with long-term previsions are reported. To investigate about the cyclic behaviour observed in long term conditions two small scale models are designed (Model A and Model B). The experimental setup of the two laboratory models is described. The results of thermal and thermomechanical short-term tests carried on Model A and longer cyclic thermo-mechanical tests performed on Model B are presented. The physical modelling allowed investigating pile's response under thermal and mechanical controlled conditions and performing cyclic long-term tests. The interpretation of in situ investigations carried out on one bored energy pile equipped with spiral heat exchanger and vibrating wire gauges are also presented. Temperature of soil and thermal performance of the pile measured during in situ tests are reported. The results obtained, both through FEM modelling and laboratory and in situ tests, appear to be important for the optimal use of these systems, which are expected to be widely used in the future. The dissertation provides experimental data dealing with the application of energy piles in pyroclastic soils in the urban area of Napoli (IT) and thermal cycles calibrated on the basis of thermal demand of the upper structure.


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