advertisement
Steel Portal Frame EC3 RUNET software
Ed = Gk + Aed + ψ2·Qk1 + ψ2·Qk2 + ψ2·Qk3 (Eq.6.12b)
Snow load Qs, Wind load Qw, Seismic load Aed
L.C. 601: Gk + 0.30Qs1 + Aed (Eq.6.14a)
16.3 Finite element model
The structure displacements and the internal forces and moments in the structure are calculated with the finite element program FRAME2Dexpress® (©RUNET).
The Finite element model uses 2-dimensinal beam elements. The axes of the elements are passing from the centroid of the cross-sections of the beams and the columns. The effective span of the portal frame is the distance between the center lines of the columns.
The increase of the stiffness of the rafter elements due to the haunches is taken into account by modifying the element stiffness matrix of the rafter elements.
Linear static and dynamic elastic analysis is performed.
The eave and apex connections are modelled as stiff connections.
The base connection is considered pin or fixed connection according to the selection of the user. The horizontal force acting outwards is resisted either by the passive earth force or by a steel tie placed into the floor slab.
16.4 Materials ΕΝ 1993-1-1:2005 § 3.2
The steel grades listed in Eurocode EN 1993-1-1 Table 3.1 and EN 1993-1-3 are included in the program.
The steel properties (yield strength f y
and ultimate strength f u
) can be changed from
Parameters/Material.
Design values for: Modulus of elasticity E=210000 N/mm², Poisson ratio ν=0.30, Unit mass
ρ= 7850 Kg/m³
Steel grades
S 235 EN 10025-2 fy:235 fu:360
S 275 EN 10025-2 fy:275 fu:430
S 355 EN 10025-2 fy:355 fu:510
S 450 EN 10025-2 fy:440 fu:550
S 275 N/NL EN 10025-3 fy:275 fu:390
S 355 N/NL EN 10025-3 fy:355 fu:490
S 420 N/NL EN 10025-3 fy:420 fu:520
S 460 N/NL EN 10025-3 fy:460 fu:540
S 275 M/ML EN 10025-4 fy:275 fu:370
S 355 M/ML EN 10025-4 fy:355 fu:470
S 420 M/ML EN 10025-4 fy:420 fu:520
S 460 M/ML' EN 10025-4 fy:460 fu:540
S 235 W EN 10025-5 fy:235 fu:360
S 355 W EN 10025-5 fy:355 fu:510
S 460 Q/QL EN 10025-6 fy:460 fu:570
S 235 H EN 10210-1 fy:235 fu:360
S 275 H EN 10210-1 fy:275 fu:430
S 355 H EN 10210-1 fy:355 fu:510
S 275 NH/NLH EN 10210-1 fy:275 fu:390
S 355 NH/NLH EN 10210-1 fy:355 fu:490
S 420 NH/NLH EN 10210-1 fy:420 fu:540
S 460 NH/NLH EN 10210-1 fy:460 fu:560
S 460 NH/NLH EN 10210-1 fy:460 fu:560
S 460 NH/NLH EN 10210-1 fy:460 fu:560
S 460 NH/NLH EN 10210-1 fy:460 fu:560
16.5 Partial factors ΕΝ 1993-1-1:2005 § 6.1
The partial factors γ
Μ
are applied to various characteristics resistance values. The partial factors are defined in the program from the selected National Annex., and can be overwritten in Parameters/National Annex parameters.
Usual values for steel structures
γ
Μ0
= 1.00
Copyright
RUNET Software www.runet-software.com 30
advertisement
