对GB/T 13096.2—1991中弓形试样截面惯性矩计算公式的再讨论

Re-discussion of the Calculating Formula of Moment of Inertia for Bow-Shaped Test Piece in GB/T 13096.2-1991

本文认为GB/T 13096.2—1991及ASTM D4476—85、ASTM D4476—97、ASTM D4476—03中计算弓形试样截面惯性矩的公式均有误,同时给出纠正后的计算公式,并与2001年公开报道的公式及美国ASTM D4476-03中的计算公式进行了比较。结果表明,纠正后的计算公式与2001年公开报道的公式计算结果相近,而与ASTM D4476—85及ASTM D4476-03中的计算公式计算结果相差较大。

This paper believes that the calculating formula of moment of inertia for bow- shaped test piece in GB/T 13096.2 - 1991and ASTM D4476- 85 is wrong .Correspondingly,the printing error appeared in ASTM D4476- 97 and ASTM D4476- 03 are also pointed out. Furtbermore,a Correct formula is given. The calculating results are compared with among the Correct formula, formula in ASTM D4776 - 03 and the formula reported publicly in 2001. It shows that the difference between the Correct forma and the formula reported publicly in 2001is less than 0.5% ,and the difference between the Correct formula and the formula in ASTM D4776- 03 is large.