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Check of displacements

Steel structures / Material overstrength

Steel structures / Behaviour factors for structural ductility class L

Steel structures / Overstrength of the structural system

Ductility class

DCH

DCМ

Element type

3.5%

3,0%

Beams

1,5%

Coupling beams with orthogonal

reinforcement

4,0%

Inverted pendulum structure

3,0%

2,5%

Coupling beams with diagonal rein-

forcement

2,0%

1,5%

Columns

Walls and braced vertical systems

P100-1/2006 used behaviour factor q=1 for DCL

• Conventional design in seismic regions based on

elastic structural analysis under reduced seismic action

• Behaviour factor depends on:

• Design overstrength

• Redundancy

• Ductility

Structures designed according to ductility classes DCM and DCH should have a good balance of ductility,

redundancy and overstrengthlarge values of behaviour factor q

• Structures with limited ductility and redundancy are assigned to ductility class DCL

•Behaviour factors q>1 possible due to overstrength

•Members with cross-section classes 1, 2, 3 1.0 ≤ q ≤ 1.5 and design according to SR EN 1993-1-1

– Members with cross-section of class 4 q =1 and design according to SR EN 1993-1-3 or SR EN 1993-1-5

Capacity design rules based on amplified seismic action for all types of structures

• In case of moment resisting frames:

P100-1/2013 adopts the minimum value of WT over all dissipative members

• Variation of WT limited to 25% to promote global plastic mechanism Steel.

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