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ELASTIC STIFFNESS OF COLUMN BASE
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Code:
Eurocode 3
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The initial elastic stiffness in rotation of the column base:
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Φ: the column base rotation:
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●
Forces on column base:
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Nsd =400kNMsd =250kNm
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●Geometry:
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z =120mm
zt,l = zc,r =
60mm
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●
Stiffnesses:
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E: Modulus of steel
E =210000MPa
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The bolt stiffness coefficient for the component method is defined as:
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where:
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As: net area of bolts
for bolt diameter
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mm As=
314mm2
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Lb: length of anchor bolts
Lb =350mm
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→ kt,l = kc,r =
1,80mm
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→ Φ =0,092rad
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→ sj.ini =2.714kNm/rad
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Classification of column base for Sway frame columns:
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Steel column:
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Moment of inertia:
Ic =3,23E+08mm4
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Length of column:
Lc =7,6m
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→ 30EIc / Lc =
267.418kNm/rad>sj.ini TRUE
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Joint type:
SEMI RIGID
(Almost pinned)
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