Abstract
In this paper, we present the result of full-scale field test for buried glass fiber reinforced thermosetting polymer plastic (GFRP) pipes with large diameter (inner diameter of 2400mm). Installation of pipe takes 10days to complete 16m depth backfilling layer by layer. The vertical and horizontal ring deflections are measured for 387days. The short-term deflection measured by the field test is compared with the result predicted by the Iowa formula and the finite-difference analysis (FDA). As a result, the value calculated by the Iowa formula tends to overestimate to a considerable extent. Vertical and horizontal ring deflections calculated by the FDA agreed with test results. In addition, the long-term ring deflection is predicted by using the procedure suggested in ASTM D 5365 in the range of 40–60years of service life of the pipe based on the experimental results. From the study, it was found that the long-term vertical ring deflection up to 60years is less than the 5% ring deflection limitation.
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