The Economic Impact Associated with the Direct Connection Strength of Micropiles in Foundation Retrofit Projects
Author(s): |
Francisco Pellicer-Martínez
Vicente Martínez-Lirón Alejandro Mateo Hernández-Díaz Jorge Pérez-Aracil José Antonio López-Juárez |
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Medium: | journal article |
Language(s): | English |
Published in: | Buildings, 24 March 2023, n. 4, v. 13 |
Page(s): | 980 |
DOI: | 10.3390/buildings13040980 |
Abstract: |
Building foundations are usually retrofitted with directly connected micropiles; however, at the present time, there are different approaches for predicting shear capacity in the micropile–foundation connection. At first, the concrete shear strength was considered. Nowadays, in the EU countries, it is prescribed to use the shear strength of the interface between successive concrete casts at different times. This implies a reduction of the connection capacity by half, and these values are not in consonance with the lab results. This work analyses the economic impact of the previous considerations on retrofit projects with micropiles. To this aim, firstly, seven different formulations were applied to 29 building projects, and the results were compared. Secondly, a Monte Carlo sensitivity analysis was performed using bond stress distribution data obtained from lab tests. Thus, numerical results acquired by comparing European and American regulations show an average difference in cost of around 40%, which may reach up to 50%. Moreover, the Monte Carlo simulation confirms that the connection strength may become a limitation in retrofit projects, also indicating that the application of European codes usually leads to the most expensive designs. Finally, the results show that it is not worth improving the connection to exceed a bond stress of 0.60 MPa, since no relevant savings are produced by achieving higher values. |
Copyright: | © 2023 by the authors; licensee MDPI, Basel, Switzerland. |
License: | This creative work has been published under the Creative Commons Attribution 4.0 International (CC-BY 4.0) license which allows copying, and redistribution as well as adaptation of the original work provided appropriate credit is given to the original author and the conditions of the license are met. |
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10728365 - Published on:
30/05/2023 - Last updated on:
01/06/2023