AASHTO Girder Properties

Table 1. AASHTO Girder Section Properties
Section ID		AASHTO-I	AASHTO-II	AASHTO-III	AASHTO-IV	AASHTO-V	AASHTO-VI
A (in²)		276	369	560	789	1013	1085
MI (in⁴)		22,750	50,980	125,390	260,730	521,180	733,320
h (in)		12.59	15.83	20.27	24.73	31.96	36.38
Cg (in)		28	36	45	54	63	72
b-top (in)		6	6	7	8	8	8
f₃ (in)		16	18	22	26	28	28
f₄ (in)		5	6	7	8	8	8
b-bot (in)		5	6	7.5	9	10	10
f₁ (in		12	12	16	20	42	42
f₂ (in)		3	3	4.5	6	7	7
w (in)		4	6	7	8	5	5
Vol./Area^a		3.045	3.371	4.056	4.696	4.231	4.31
Wide Top Flange	Max. Thick-in
Wide Top Flange	Fillet Width-in

Note:

Vol/Area is calculated as the cross-sectional area of the girder divided by the perimeter. For box beams, consider the internal and external perimeters.

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