Theory and design of Structures
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The value of dr, the design inter story drift, shall be calculated in accordance with section 4.3.4. What does section 4.3.4 state?
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Even if it isn't stated in the code explicitly, If the value of θ is between 0.2 and 0.3 a more acurate method of P-Δ analysis shall be used.
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ES EN 1998:2015, Art. 4.4.2.2(2)
This section of the code states that the interstory drift sensitivity coefficient(θ):
1. should be less than 0.1 to say a structural system is non-sway.
2. Approximate analysis can be used if 0.1<θ<=0.2. The method suggested is multiplying the relevant seismic action effects by factor 1/(1-θ)
3. The value of θ should not exceed 0.3.
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Criteria to consider p-Δ effect as per the new and old code of seismic design:
qo values according to ES EN 1998:2015
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Behavior factor calculation according to ES EN 1998:2015
q=q₀kw>=1.5 [ES EN 1998:2015, Eqn. 5.1]
qo is the basic value of the behavior factor, dependent on the type of structural system and on its regularity in elevation.
Kw is the factor reflecting the prevailing failure mode in structural systems with walls.
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Behavior factor calculation according to EBCS-8,1995( old code)
γ=γ₀*Kd*Kr*Kw [EBCS 8-1995, Eqn. 3.2 ]
Where:
γ₀ is the basic value of behavior factor, dependent on the structural type.
Kd factor reflecting the ductility class
Kr factor reflecting the structural regularity in elevation
Kw factor reflecting the prevailing failure mode in structural systems with walls.
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