Environmental Engineering Reference
In-Depth Information
Fig. 4.18 Action effects on fully overcompressed joint between precast concrete elements
(assumption: “very smooth”). Using the coefficient of friction
m¼
0.5, it follows that
(Figure 4.18)
b
¼
0
5
N
Ed
2
p
R
m
:
v
Rd
;
ct
¼
c
j
f
ctd
m s
Nd
Action effects in the circumferential direction of the joint:
T
Ed
2
p
R
2
m
Using the format for checking the load-carrying capacity
V
Ed
p
R
m
;
v
Ed
¼
t
Ed
¼
v
Ed
þ
t
Ed
v
Ed
;
ct
it follows that
T
Ed
2
R
m
0
V
Ed
þ
:
25
N
Ed
At the serviceability limit state, joints between elements must be fully overcompressed
in the (frequent) design load cases (decompression limit state, see Section 4.8.3).
Furthermore, the level of prestress should be chosen in such a way that no
decompression occurs even under a fatigue action effect, see Section 4.9.
4.7.4.2 Shear force transfer across opening joints
The shear capacity of opening joints between elements must be determined as follows
for external prestressing.
Eq. (84) from [33] 10.3.6 should be applied here in a suitable form to the flexural
compression zone (Figure 4.19):
