Experimental Investigations on Load Transfer of PHC Piles in Highway Foundation Using FBG Sensing Technology
Autor: | Huafu Pei, Gao-yu Su, Xiaocen Lu, Guowei Li, Andrew Cudzo Amenuvor, Jiantao Wu |
---|---|
Rok vydání: | 2017 |
Předmět: |
Engineering
business.industry 0211 other engineering and technologies Foundation (engineering) Soil Science 020101 civil engineering 02 engineering and technology Structural engineering Penetration test Dynamic load testing 0201 civil engineering Fiber Bragg grating Geotechnical engineering Limit state design business Vibrating wire Pile Strain gauge 021101 geological & geomatics engineering |
Zdroj: | International Journal of Geomechanics. 17 |
ISSN: | 1943-5622 1532-3641 |
DOI: | 10.1061/(asce)gm.1943-5622.0000797 |
Popis: | Pretensioned spun high-strength concrete (PHC) piles are increasingly used to improve highway foundations with large pile spacing and short pile length without splicing. In this paper, a series of field tests comprising cone penetration tests (CPTs), piling, and static pile load tests were performed to investigate the load transfer mechanism of such PHC piles, the load transfer mechanisms of which are different from that of long piles with splices used in structural foundations. The variation of axial strain along PHC piles was monitored during piling and load tests using fiber Bragg grating (FBG) sensing technology and conventional vibrating wire (VW) strain gauges. The results show the superiority of FBG sensing technology in terms of reliability of data and feasibility of measurement under fast changing axial strain. The experimental data also show significant variation in the shaft and tip resistance during piling and the pile-soil strength limit state of the load tests. |
Databáze: | OpenAIRE |
Externí odkaz: |