D5.D.6.1 Clause 3.2.1(1) - Material Properties

The material strengths (i.e., - steel grade strengths) to be used with NF EN 1993-1-1 are given in Table 3.1 of the code. The French National Annex however, specifies a separate table (Table 3.1 NF) for the yield and tensile strengths of steel grades. This new table replaces Table 3.1 in NF EN 1993-1-1:2005. Table 3.1 NF excludes steel grades from standards EN 10210-1 and EN 10219-1 that are given in EC-3.

STAAD.Pro uses the steel grades and values from the table given in the National Annex (i.e., - Table 3.1 NF). Table 3.1 NF is similar to table 3.1 in EC3, apart from the f_u values for S 355 and S355 W grade steel.

Table 1. Material strengths specified for use with the NF-NA
Standard and grade of steel		Nominal thickness, t, of the element (mm)
		t 40 mm		40 mm < t ≤ 80 mm
		f_y (N/mm²)	f_u (N/mm²)	f_y (N/mm²)	f_u (N/mm²)
EN 10025-2	S 235	235	360	215	360
	S 275	275	430	255	410
	S 355	355	490	335	470
	S 450	440	550	410	550
EN 10025-3	S 275 N/NL	275	390	255	370
	S 355 N/NL	355	490	335	470
	S 420 N/NL	420	520	390	520
	S 460 N/NL	460	540	430	540
EN 10025-4	S 275 M/ML	275	370	255	360
	S 355 M/ML	355	470	335	450
	S 420 M/ML	420	520	390	500
	S 460 M/ML	460	540	430	530
EN 10025-5	S 235 W	235	360	215	340
EN 10025-5	S 355 W	355	490	335	490
EN 10025-6	S 460 Q/QL/QL 1	460	570	440	550

If you specify a steel grade that is not given in the Annex Table 3.1 (NF) but is present in Table 3.1 of EN 1993-1-1:2005, the program uses the values from Table 3.1 of EN 1993-1-1:2005. The appropriate yield strength (f_y) used is shown in the design output file.