Experimental Study on Dynamic Response Characteristics of RPC and RC Micro Piles in SAJBs
The pile foundations below approach slab in a semi-integral abutment jointless bridge (SAJB) that requires high flexibility to accommodate the horizontal cyclic deformation of approach slab generated by the girder’s thermal expansion and contraction as well as earthquake action. In this pa...
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-06-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/9/13/2644 |
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| author | Junfeng Cheng Xiaoyong Luo Yizhou Zhuang Liang Xu Xiaoye Luo |
| author_facet | Junfeng Cheng Xiaoyong Luo Yizhou Zhuang Liang Xu Xiaoye Luo |
| author_sort | Junfeng Cheng |
| collection | DOAJ |
| description | The pile foundations below approach slab in a semi-integral abutment jointless bridge (SAJB) that requires high flexibility to accommodate the horizontal cyclic deformation of approach slab generated by the girder’s thermal expansion and contraction as well as earthquake action. In this paper, reactive powder concrete (RPC) and reinforce concrete (RC) micro piles were designed and fabricated. The shaking table tests on dynamic response of micro piles-soil interaction were conducted to investigate the dynamic response characteristics such as the strain time history of pile-soil system, the bending moment, and the deformation of piles. The maximum strain response of piles was observed at the buried depth of 4.2 D (D is the diameter of pile). Meanwhile, the maximum bending moments of RPC and RC piles appear at the depth of 0.64 D and 0.42 D, respectively, under the dynamic load excitation, and the peak horizontal deformation of piles were observed at pile head. It is found that the bending moment and the strain response of the RPC pile are larger than that of the RC micro pile, and increased by 40% and 98%, respectively. The RPC micro pile has better crack resistance, higher ductility, and flexural rigidity than that of the RC pile, and it can be widely used as pile foundations in SAJBs for the earthquake area. |
| first_indexed | 2024-12-20T14:28:49Z |
| format | Article |
| id | doaj.art-90499250f7f3478ebe47ba36d5340c4a |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-12-20T14:28:49Z |
| publishDate | 2019-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-90499250f7f3478ebe47ba36d5340c4a2022-12-21T19:37:42ZengMDPI AGApplied Sciences2076-34172019-06-01913264410.3390/app9132644app9132644Experimental Study on Dynamic Response Characteristics of RPC and RC Micro Piles in SAJBsJunfeng Cheng0Xiaoyong Luo1Yizhou Zhuang2Liang Xu3Xiaoye Luo4School of Civil Engineering, Central South University, Changsha 410075, ChinaSchool of Civil Engineering, Central South University, Changsha 410075, ChinaCollege of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, ChinaSchool of Civil Engineering, Chongqing University, Chongqing 400045, ChinaCollege of Civil Engineering, Fuzhou University, Fuzhou 350108, ChinaThe pile foundations below approach slab in a semi-integral abutment jointless bridge (SAJB) that requires high flexibility to accommodate the horizontal cyclic deformation of approach slab generated by the girder’s thermal expansion and contraction as well as earthquake action. In this paper, reactive powder concrete (RPC) and reinforce concrete (RC) micro piles were designed and fabricated. The shaking table tests on dynamic response of micro piles-soil interaction were conducted to investigate the dynamic response characteristics such as the strain time history of pile-soil system, the bending moment, and the deformation of piles. The maximum strain response of piles was observed at the buried depth of 4.2 D (D is the diameter of pile). Meanwhile, the maximum bending moments of RPC and RC piles appear at the depth of 0.64 D and 0.42 D, respectively, under the dynamic load excitation, and the peak horizontal deformation of piles were observed at pile head. It is found that the bending moment and the strain response of the RPC pile are larger than that of the RC micro pile, and increased by 40% and 98%, respectively. The RPC micro pile has better crack resistance, higher ductility, and flexural rigidity than that of the RC pile, and it can be widely used as pile foundations in SAJBs for the earthquake area.https://www.mdpi.com/2076-3417/9/13/2644semi-integral abutment jointless bridge (SAJB)dynamic response characteristicsRPC micro pileRC micro pileshaking table testspile-soil interaction |
| spellingShingle | Junfeng Cheng Xiaoyong Luo Yizhou Zhuang Liang Xu Xiaoye Luo Experimental Study on Dynamic Response Characteristics of RPC and RC Micro Piles in SAJBs Applied Sciences semi-integral abutment jointless bridge (SAJB) dynamic response characteristics RPC micro pile RC micro pile shaking table tests pile-soil interaction |
| title | Experimental Study on Dynamic Response Characteristics of RPC and RC Micro Piles in SAJBs |
| title_full | Experimental Study on Dynamic Response Characteristics of RPC and RC Micro Piles in SAJBs |
| title_fullStr | Experimental Study on Dynamic Response Characteristics of RPC and RC Micro Piles in SAJBs |
| title_full_unstemmed | Experimental Study on Dynamic Response Characteristics of RPC and RC Micro Piles in SAJBs |
| title_short | Experimental Study on Dynamic Response Characteristics of RPC and RC Micro Piles in SAJBs |
| title_sort | experimental study on dynamic response characteristics of rpc and rc micro piles in sajbs |
| topic | semi-integral abutment jointless bridge (SAJB) dynamic response characteristics RPC micro pile RC micro pile shaking table tests pile-soil interaction |
| url | https://www.mdpi.com/2076-3417/9/13/2644 |
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