Recently, underground pipes are utilized in various fields of applications such as sewer lines, drain lines, water mains, gas lines, telephone and electrical conduits, culverts, oil lines, etc. Most of pipes are installed for long-term purposes and they should be safely installed in consideration of...
Recently, underground pipes are utilized in various fields of applications such as sewer lines, drain lines, water mains, gas lines, telephone and electrical conduits, culverts, oil lines, etc. Most of pipes are installed for long-term purposes and they should be safely installed in consideration of installation conditions because there are unexpected various terrestrial loading conditions. In this paper, we present the result of investigation pertaining to the structural behavior of glass fiber reinforced thermosetting polymer plastic (GFRP) flexible pipes buried underground. The mechanical properties of the GFRP flexible pipes produced in the domestic manufacturer are determined and the results are reported in this paper. In addition, ring deflection is measured by the field tests and the finite element analysis (FEA) is also conducted to simulate the structural behavior of GFRP pipes buried underground. From the field test results, we predicted long-term, up to 50 years, ring deflection of GFRP pipes buried underground based on the method suggested by the existing literature. It was found that the GFRP flexible pipe to be used for cooling water intake system in the nuclear power plant is appropriate because 5% ring deflection limitation for 50 years could be satisfied.
Recently, underground pipes are utilized in various fields of applications such as sewer lines, drain lines, water mains, gas lines, telephone and electrical conduits, culverts, oil lines, etc. Most of pipes are installed for long-term purposes and they should be safely installed in consideration of installation conditions because there are unexpected various terrestrial loading conditions. In this paper, we present the result of investigation pertaining to the structural behavior of glass fiber reinforced thermosetting polymer plastic (GFRP) flexible pipes buried underground. The mechanical properties of the GFRP flexible pipes produced in the domestic manufacturer are determined and the results are reported in this paper. In addition, ring deflection is measured by the field tests and the finite element analysis (FEA) is also conducted to simulate the structural behavior of GFRP pipes buried underground. From the field test results, we predicted long-term, up to 50 years, ring deflection of GFRP pipes buried underground based on the method suggested by the existing literature. It was found that the GFRP flexible pipe to be used for cooling water intake system in the nuclear power plant is appropriate because 5% ring deflection limitation for 50 years could be satisfied.
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문제 정의
In this paper, we estimated the long-term ring deflection by the method of regression analysis on the GFRP buried pipe based on the data obtained by the field tests and the material tests conducted in the laboratory. In the prediction, we used the method suggested by the KS M ISO 10928 (2004).
제안 방법
In the test, dead load and live load effects on the structural behavior of buried pipes are investigated, respectively or in combination. In the field tests, GFRP pipes having 2,400mm diameter are installed and compaction of backfill material with 95% standard proctor compaction density was conducted. From bedding to haunch of the pipe the backfill material is compacted using vibrating roller and the backfill soil is compacted by 30cm, layer by layer, intervals using roller above the pipe haunch.
데이터처리
The test data was analyzed by log-log linear least squares regression to find the 50-year expected strain.
이론/모형
In this paper, we estimated the long-term ring deflection by the method of regression analysis on the GFRP buried pipe based on the data obtained by the field tests and the material tests conducted in the laboratory. In the prediction, we used the method suggested by the KS M ISO 10928 (2004).
In the method, strain (and/or deflection) measured with elapsed time is used for the ring deflection prediction. Testing was conducted following the guidelines of KS M ISO 10928-04 (Plastic piping systems-Glass-reinforced thermosetting plastics (GRP) pipes and fittings-Methods for regression analysis and their use).
참고문헌 (10)
ASTM D 5365. (2006). "Standard test method for long-term ring-bending strain of fiberglass (glass-fiber-reinforced thermosetting-resin) pipe." American Society for Testing and Materials.
AWWA. (2005). "Fiberglass pipe design." 2nd Ed. Manual No. M 45, American Water Works Association.
Hongik University Research Institute of Science and Technology. (2011). "Investigation of pipe deflection behavior and prediction of long-term ring deflection of GFRP pipe ( $\Phi$ 2,400mm) buried underground." Research Report. Seoul, Korea.
KS M ISO 9969. (2008). "Thermoplastics pipes-determination of ring stiffness" Korean Agency for Technology and Standards (KS), Seoul, Korea.
KS M ISO 10928. (2004). Plastics piping systems-glass-reinforced thermosetting plastics (GRP) pipes and fittings-methods for regression analysis and their use, Korean Agency for Technology and Standards (KS), Seoul, Korea.
Kim, S. H., Choi, J. W., Joo, H. J., and Yoon, S. J. (2010). "Estimation of load carrying capacity of pultruded FRP compression member." The Korean Society for Composite Materials.
Kim, S. H., Ok, D. M., An, D. J., Hong, W. H., and Yoon, S.-J. (2012). "Prediction of long-term ring deflection of buried GFRP flexible pipe." The 2nd International Conference on Advanced Polymer Matrix Composites.
MIDAS/GTS. (2009). Analysis reference, MIDAS Information Technology Co., Ltd.
Park J. S. (2012). A Study on the ring deflection limitation of buried flexible pipes. Ph.D. Thesis, Department of Civil Engineering, Hongik University, Seoul, Korea.
Watkins, R. and Anderson, L. R. (2000). Structural Mechanics of Buried Pipes. CRC Press, New York.
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