Nonlinear Static and Dynamic Analysis of Steel Structures with ...

Chapter 1 Design of steel structures with Eurocode 3
Stress
distribution
in parts
(compression
positive)
4
3 c / t 124
c / t 42
42
when 1:
c / t
0,
67 0,
33
when 1
*)
: c / t 62
( 1
) (
)
235/
f y
fy
235
1,00
275
0,92
355
0,81
420
0,75
460
0,71
*)
where ς ≤ -1 applies where either the compression stress ζ < fy or the tensile strain εy > fy/E
Table 1.2: Maximum width-to-thickness ratios for compression parts
1.3 Finite element methods of analysis
1.3.1 General
The choice of the FE-method depends on the problem to be analysed and based on the
following assumptions:
No Material
behavior
f y
-
+
f y
c/2
c
Geometric
behavior
Imperfections Example of use
1 linear linear no elastic shear lag effect, elastic resistance
2 nonlinear linear no plastic resistance in ULS
3 linear nonlinear no critical plate buckling load
4 linear nonlinear yes elastic plate buckling resistance
5 nonlinear nonlinear yes elastic-plastic resistance in ULS
Table 1.3: Assumptions for FE-methods
Use
In using FEM for design, special care should be taken to:
– the modeling of the structural component and its boundary conditions;
– the choice of software and documentation;
– the use of imperfections;
– the modeling of material properties;
– the modeling of loads;
– the modeling of limit state criteria;
– the partial factors to be applied.
+
f y
c
-
f y
+
f y
c