Figure 11 and Figure 12 show the distribution
of the bending stiffness along the column
axis related to the bending stiffness of the
undisturbed region (subzone 7). In zone 2, the
stiffness of precast column A is for both sizes
of BOLDA® column shoes significantly higher
compared to the cast-in-situ columns. In Zone
3, the relative stiffness of precast column A is
smaller than the value obtained for column B.
Nevertheless, the higher stiffness of zone 2 will
compensate for the lower stiffness in zone 3.
The calculated deflection at the top of the
columns based on the measured deformations
are vshoe = 165 mm (BOLDA® 30) and
vshoe = 262 mm (BOLDA® 52). These values are
ca. 13.4% lower (BOLDA® 30) and 4.9% higher
(BOLDA® 52) than the reference values of the
cast-in-situ columns. According to EAD 1, the
ratio of is limited to vshoe/vref ≤ 1.05. Therefore,
the requirements are fulfilled and a factor
kL = 1.0 can be used in the design of the columns
according to EN 1992-1-1 4.
Precast
100
130
145
161
167
188
43
Zone 2 Zone 1
Column shoe zone
Zone 3
Column A
BOLDA 52
cast-in-situ
100
113
112
111
110
108
103
Column B
Precast
100
206
280
278
261
197
69
Zone 2 Zone 1
Column shoe zone
Zone 3
Column A
BOLDA 30
cast-in-situ
100
128
126
125
122
110
107
Column B
FIGURE 11: EVALUATION OF TEST RESULTS FOR COLUMNS A (BOLDA® 30) AND
B – RELATIVE BENDING STIFFNESS OF SUBZONES IN %
FIGURE 12: EVALUATION OF TEST RESULTS FOR COLUMNS A (BOLDA® 52) AND
B – RELATIVE BENDING STIFFNESS OF SUBZONES IN %
PEIKKO CONNECTIONS 1/2021 53