Test body, strain measurement method, contraction / expansion strain estimation method and effective prestress amount estimation method

摘要

PROBLEM TO BE SOLVED: To measure a contraction/expansion strain under the same environmental condition as the actual structure, and accurately obtain a long-term effective pre-stress amount of the actual structure.SOLUTION: A test piece used for estimating a contraction/expansion strain of a structure includes: a plurality of reinforcing bars 3 disposed so as to have substantially the same reinforcing-bar ratio as that of the structure; a strain sensor 1 supported by each reinforcing bar 3; and an RFID tag 9 for outputting a signal acquired from the strain sensor 1. Furthermore, this test piece is configured in a columnar shape using at least three reinforcing bars disposed in parallel with the vertical direction, and the strain sensor 1 is surrounded by the three reinforcing bars 3.SELECTED DRAWING: Figure 1B