A New Method for Predicting Dynamic Pile Head Stiffness Considering Pile–Soil Relative Stiffness Under Long-Term Cyclic Loading Conditions
Under long-term horizontal cyclic loading, the evolution characteristics of the loading and unloading stiffness of piles are an important representation of pile–soil interaction. However, research in this area is limited, particularly regarding the impact of factors like pile–soil relative stiffness...
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MDPI AG
2024-10-01
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| author | Jie Chen Jiaqing Shu Shuang Xi Xiaoqing Gu Mingxing Zhu Xiaojuan Li |
| author_facet | Jie Chen Jiaqing Shu Shuang Xi Xiaoqing Gu Mingxing Zhu Xiaojuan Li |
| author_sort | Jie Chen |
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| description | Under long-term horizontal cyclic loading, the evolution characteristics of the loading and unloading stiffness of piles are an important representation of pile–soil interaction. However, research in this area is limited, particularly regarding the impact of factors like pile–soil relative stiffness. In this study, laboratory tests with a long-term horizontal cyclic loading strategy were conducted to study various factors, including different cyclic amplitude ratios (<i>ζ<sub>b</sub></i>), cyclic load ratios (<i>ζ<sub>c</sub></i>), and pile–soil relative stiffness (<i>T</i>/<i>L</i>) in sandy soil, on dynamic pile head stiffness. The results show that the normalized cumulative displacement increases with the number of cycles and the ratio of <i>T</i>/<i>L</i> but tends to decrease as <i>ζ<sub>c</sub></i> increases. As <i>ζ<sub>b</sub></i> increases, the normalized cyclic loading stiffness also rises, while it has little effect on the normalized cyclic unloading stiffness. On the other hand, as <i>ζ<sub>c</sub></i> or <i>T</i>/<i>L</i> increases, the cyclic loading stiffness increases while the unloading stiffness decreases. Based on these observations, prediction formulas for normalized cumulative displacement and cyclic loading and unloading stiffness were established and confirmed with test results. The findings of this study provide methodological references for establishing models of pile–soil interaction under cyclic loading and for predicting loading and unloading stiffness under different influencing factors. |
| format | Article |
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| language | English |
| publishDate | 2024-10-01 |
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| spelling | doaj-art-fa2af57791144f8395c62708b7e181a02025-08-20T01:53:49ZengMDPI AGBuildings2075-53092024-10-011411348310.3390/buildings14113483A New Method for Predicting Dynamic Pile Head Stiffness Considering Pile–Soil Relative Stiffness Under Long-Term Cyclic Loading ConditionsJie Chen0Jiaqing Shu1Shuang Xi2Xiaoqing Gu3Mingxing Zhu4Xiaojuan Li5School of Civil Engineering and Architecture, Jiangsu University of Science and Technology, Zhenjiang 212003, ChinaChina Energy Engineering Group, Jiangsu Electric Power Design and Research Institute Co., Ltd., Nanjing 210024, ChinaSchool of Civil Engineering and Architecture, Jiangsu University of Science and Technology, Zhenjiang 212003, ChinaChina Energy Engineering Group, Jiangsu Electric Power Design and Research Institute Co., Ltd., Nanjing 210024, ChinaSchool of Civil Engineering and Architecture, Jiangsu University of Science and Technology, Zhenjiang 212003, ChinaSchool of Civil Engineering and Architecture, Jiangsu University of Science and Technology, Zhenjiang 212003, ChinaUnder long-term horizontal cyclic loading, the evolution characteristics of the loading and unloading stiffness of piles are an important representation of pile–soil interaction. However, research in this area is limited, particularly regarding the impact of factors like pile–soil relative stiffness. In this study, laboratory tests with a long-term horizontal cyclic loading strategy were conducted to study various factors, including different cyclic amplitude ratios (<i>ζ<sub>b</sub></i>), cyclic load ratios (<i>ζ<sub>c</sub></i>), and pile–soil relative stiffness (<i>T</i>/<i>L</i>) in sandy soil, on dynamic pile head stiffness. The results show that the normalized cumulative displacement increases with the number of cycles and the ratio of <i>T</i>/<i>L</i> but tends to decrease as <i>ζ<sub>c</sub></i> increases. As <i>ζ<sub>b</sub></i> increases, the normalized cyclic loading stiffness also rises, while it has little effect on the normalized cyclic unloading stiffness. On the other hand, as <i>ζ<sub>c</sub></i> or <i>T</i>/<i>L</i> increases, the cyclic loading stiffness increases while the unloading stiffness decreases. Based on these observations, prediction formulas for normalized cumulative displacement and cyclic loading and unloading stiffness were established and confirmed with test results. The findings of this study provide methodological references for establishing models of pile–soil interaction under cyclic loading and for predicting loading and unloading stiffness under different influencing factors.https://www.mdpi.com/2075-5309/14/11/3483pile foundationpile–soil relative stiffnesslateral cycle testcumulative deformationcyclic stiffness |
| spellingShingle | Jie Chen Jiaqing Shu Shuang Xi Xiaoqing Gu Mingxing Zhu Xiaojuan Li A New Method for Predicting Dynamic Pile Head Stiffness Considering Pile–Soil Relative Stiffness Under Long-Term Cyclic Loading Conditions Buildings pile foundation pile–soil relative stiffness lateral cycle test cumulative deformation cyclic stiffness |
| title | A New Method for Predicting Dynamic Pile Head Stiffness Considering Pile–Soil Relative Stiffness Under Long-Term Cyclic Loading Conditions |
| title_full | A New Method for Predicting Dynamic Pile Head Stiffness Considering Pile–Soil Relative Stiffness Under Long-Term Cyclic Loading Conditions |
| title_fullStr | A New Method for Predicting Dynamic Pile Head Stiffness Considering Pile–Soil Relative Stiffness Under Long-Term Cyclic Loading Conditions |
| title_full_unstemmed | A New Method for Predicting Dynamic Pile Head Stiffness Considering Pile–Soil Relative Stiffness Under Long-Term Cyclic Loading Conditions |
| title_short | A New Method for Predicting Dynamic Pile Head Stiffness Considering Pile–Soil Relative Stiffness Under Long-Term Cyclic Loading Conditions |
| title_sort | new method for predicting dynamic pile head stiffness considering pile soil relative stiffness under long term cyclic loading conditions |
| topic | pile foundation pile–soil relative stiffness lateral cycle test cumulative deformation cyclic stiffness |
| url | https://www.mdpi.com/2075-5309/14/11/3483 |
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