FIRE RESISTANCE
To determine temperatures in case of fire, fire tests
on 3 test specimens (BOLDA® 30, BOLDA® 39 and
BOLDA® 52) have been conducted at Technical
University of Kaiserslautern 12, 13. In addition,
fire simulations using finite element method
(FEM) were carried out on five column shoe sizes.
The temperatures determined should serve
as a basis for design in the event of fire. The
determination of the temperature is based on
TR 068 2. The results of the fire tests 12 are
compared with the results of the FEM simulation
13, and the respective temperatures in case
of fire are derived at the critical points of the
connection after 30, 60, 90, and 120 minutes of
fire duration.
The specimens under consideration consist
of a reinforced concrete column connected to
a reinforced concrete foundation by means of
BOLDA® column shoes and PPM® anchor bolts.
The geometry of the test specimens for the
fire tests, as well as the FE analysis is shown
schematically in Figure 22. The measuring
points in the tests correspond to those shown
in Figure 22. These measuring points TE14 and
TE15 were used for further evaluation.
The dimensions of the column and the
foundation, the thickness of the joint, and the
combination of column shoes and anchor bolts
are given in Table 6. The dimensions of the
columns and foundations correspond to the
respective required minimum values.
FIGURE 22: OVERVIEW OF THE CRITICAL SECTION
A) COMPLETE SPECIMEN
B) BOLDA® 30 COLUMN SHOE AND ANCHOR
BOLT PPM® 30 P
FIGURE 23: EXAMPLE OF THE FINITE ELEMENT MODEL 13
Column
Anchor bar
Rear bar
Side plate
Measuring point TE 14
Base plate
Measuring point TE 15
Anchor bolt
Foundation
Column shoe Anchor bolt Column Foundation Joint thickness
mm x mm mm x mm mm
BOLDA® 30 PPM 30 P 310 x 310 410 x 410 50
BOLDA® 36 PPM 36 P 360 x 360 460 x 460 55
BOLDA® 39 PPM 39 P 390 x 390 490 x 490 60
BOLDA® 45 PPM 45 P 450 x 450 550 x 550 65
BOLDA® 52 PPM 45 P 500 x 500 600 x 600 70
TABLE 6: SIZES OF COLUMN SHOE AND ANCHOR BOLTS AND CORRESPONDING MINIMUM CONCRETE
SECTIONS 12
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