c
4 x BOLDA® 30 4 x BOLDA® 36 4 x BOLDA® 39 4 x BOLDA® 45 4 x BOLDA® 52
4 x PEC® 30 4 x PEC® 36 4 x PEC® 39 4 x PEC® 45 4 x PEC® 52
A) GEOMETRY OF COLUMN CROSS SECTIONS FOR BOLDA® AND PEC® COLUMN SHOES
1,30
1,20
1,10
1,00
0,90
0,80
0,70
0,60
30 36 39 45 52
CONSTRUCTIONAL IMPROVEMENTS
Further changes to improve the overall stiffness
of the column shoes have been made. Already
during the development process of HPKM®
column shoes we realized that building a
straight form of the side plate up to the starting
point of the anchor bars increases the stiffness
of the connection. With BOLDA®, the outer
edges of the base plate as well as the side
plates are only inclined at 48° to each other
instead of the 90° for previous systems TKM or
PKM, which in turn leads to increased stiffness.
Peikko’s PEC®
Competitor A
Competitor B
Competitor C
Column shoe size
min Acol,BOLDA /min A col,i
B) COMPARISON
FIGURE 6: MINIMUM REQUIRED COLUMN CROSS SECTIONS OF BOLDA® COLUMN SHOES COMPARED TO PEC® COLUMN SHOES AND TO VARIOUS COMPETITORS
This reduced angle in combination with the
different positioning of the rear bars results in a
significant reduced space requirement for each
column shoe, which consequently leads to 12%
to 26% smaller column cross sections compared
to predecessor type (compare Figure 6).
During the development process, efforts were
also made to further improve and streamline
the production process. This was achieved, for
example, by optimizing the number of welding
seams, which subsequently improves indirectly
the overall safety due to minimization of
error-proneness.
Due to the above-mentioned improvements,
the overall form of the BOLDA® column shoes
is more compact and stiffer compared to older
versions. BOLDA® column shoe enables 20%
slimmer cross-sections compared to PEC®.
In combination with the optimization of the
production process, a significant reduction in
the overall CO2 footprint was achieved.
420
420
500
500
580
580
390
390
60 270 60 60 300 60
60 380 60 60 460 60
350
350
50 250 50
310
310
50 210 50
360
360
60 240 60
395
395
60 275 60
440
440
60 320 60
500
500
70 360 70
PEIKKO CONNECTIONS 1/2021 49