The Economic Impact Associated with the Direct Connection Strength of Micropiles in Foundation Retrofit Projects
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...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-04-01
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| Series: | Buildings |
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| Online Access: | https://www.mdpi.com/2075-5309/13/4/980 |
| _version_ | 1797606153857794048 |
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| author | Francisco Pellicer-Martínez Vicente Martínez-Lirón Alejandro Mateo Hernández-Díaz Jorge Pérez-Aracil José Antonio López-Juárez |
| author_facet | Francisco Pellicer-Martínez Vicente Martínez-Lirón Alejandro Mateo Hernández-Díaz Jorge Pérez-Aracil José Antonio López-Juárez |
| author_sort | Francisco Pellicer-Martínez |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-11T05:11:16Z |
| format | Article |
| id | doaj.art-a5152b4a32aa4156ac8b1950f916540a |
| institution | Directory Open Access Journal |
| issn | 2075-5309 |
| language | English |
| last_indexed | 2024-03-11T05:11:16Z |
| publishDate | 2023-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Buildings |
| spelling | doaj.art-a5152b4a32aa4156ac8b1950f916540a2023-11-17T18:35:49ZengMDPI AGBuildings2075-53092023-04-0113498010.3390/buildings13040980The Economic Impact Associated with the Direct Connection Strength of Micropiles in Foundation Retrofit ProjectsFrancisco Pellicer-Martínez0Vicente Martínez-Lirón1Alejandro Mateo Hernández-Díaz2Jorge Pérez-Aracil3José Antonio López-Juárez4Department of Civil Engineering, Catholic University of Murcia (UCAM), Av. de los Jerónimos, 135, 30107 Guadalupe, Murcia, SpainDepartment of Civil Engineering, Catholic University of Murcia (UCAM), Av. de los Jerónimos, 135, 30107 Guadalupe, Murcia, SpainDepartment of Continuum Mechanics and Structural Analysis, University of La Laguna, 38205 Santa Cruz de Tenerife, Canarias, SpainDepartment of Signal Processing and Communications, University of Alcalá de Henares, Campus Universitario, Ctra. Madrid-Barcelona Km, 33, 600, 28805 Alcalá de Henares, Madrid, SpainDepartment of Civil Engineering, Catholic University of Murcia (UCAM), Av. de los Jerónimos, 135, 30107 Guadalupe, Murcia, SpainBuilding 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.https://www.mdpi.com/2075-5309/13/4/980underpinningretrofitbond stressgroutMonte Carlo simulation |
| spellingShingle | Francisco Pellicer-Martínez Vicente Martínez-Lirón Alejandro Mateo Hernández-Díaz Jorge Pérez-Aracil José Antonio López-Juárez The Economic Impact Associated with the Direct Connection Strength of Micropiles in Foundation Retrofit Projects Buildings underpinning retrofit bond stress grout Monte Carlo simulation |
| title | The Economic Impact Associated with the Direct Connection Strength of Micropiles in Foundation Retrofit Projects |
| title_full | The Economic Impact Associated with the Direct Connection Strength of Micropiles in Foundation Retrofit Projects |
| title_fullStr | The Economic Impact Associated with the Direct Connection Strength of Micropiles in Foundation Retrofit Projects |
| title_full_unstemmed | The Economic Impact Associated with the Direct Connection Strength of Micropiles in Foundation Retrofit Projects |
| title_short | The Economic Impact Associated with the Direct Connection Strength of Micropiles in Foundation Retrofit Projects |
| title_sort | economic impact associated with the direct connection strength of micropiles in foundation retrofit projects |
| topic | underpinning retrofit bond stress grout Monte Carlo simulation |
| url | https://www.mdpi.com/2075-5309/13/4/980 |
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