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The Rectangular hollow section may be used in bolted column base connections. For further info see also chapter: "Supported cross-sections".
The Rectangular hollow section are designed according to the Ref.[22] and Ref.[32].
The bolts can only be positioned outside the Rectangular hollow section with internal bolt distance not exceeding width of the section. At least two bolt-rows must be present.
The rotational stiffness is not calculated due to the lack of theory available.
The determination of NRd,c is :
For more information, see chapter "Normal force resistance".
Where the projection of the base plate is less than c the effective bearing area should be assumed to be as indicated in the following figures.
Where the projection of the base plate exceeds c the additional projection should be neglected, see the figure,
with
|
A |
Bearing area |
|
A' |
Area not included in bearing area. |
Consider the following figures :
The allowable tension force for each bolt FT,Rd,i is given by
with
|
tp |
plate thickness |
|
fyp |
yield strength of plate |
|
d’ |
bolthole diameter |
|
d |
bolt diameter |
|
ti |
thickness of RHS section |
|
a,b |
see figures |
|
p |
= 2e = w/2 = 2e = w |
|
Ft,Rd |
design tension resistance of a bolt |
The total design tension resistance Nt,Rd is then
MRd is given by
with
|
FT |
ΣFT,Rd,i for the bolts in tension |
|
Fc |
min( Fc,base,Rd, Fc,rhs_flange) |
The design compression resistance for concrete under the flange, Fc,base,Rd is :
with
|
fj |
the bearing strength of the joint |
|
Afl |
the bearing area under the compression flange. |
The design compression resistance for the RHS compression flange, Fc,rhs_flange is :
with
|
b |
width of RHS section |
|
t |
thickness of RHS section |
|
fy |
yield strength of RHS section |
|
γM0 |
partial safety factor |