Page 35 - DOUCE HYDRO 2013

35
STU:
ShockTransmission Units
P R O T E C T I O N S
Dynamic connectors
Without STU
With STU
Comparison with and without dampers
1 fixed pier =
no damper, no STU
Central Pier must resist at 17400 kN
(shear Force)
1 fixed pier + 4 = 5 «fixed» piers
The 5 piers are connected dynamically by
blocking devices (STU)
The shear force on the central pier is
7780kN but the total force accepted by all
the structure is 38 900kN
1.74 m/s2
0.52s 1.15s
3.89m/s2
5 fixed piers
1 fixed pier
Period
MaximumAcceleration
of the desk
Applications:
Shock Transmission Units (STU), also called Dynamic Connectors, can be used for
both steel and concrete structures. They are disposed on cable stayed and suspension
bridges in order to eliminate large displacements of the deck during an earthquake.
For other civil engineering structures such as buildings, STU can provide additional
rigidity in the frame structure. STU can also be used to strengthen adjacent buildings
during a seismic event.
The retrofit of existing steel truss railway bridges with STU can allow heavier trains
and take the increasing braking forces without a change to the substructure. STU can
be designed to strengthen supporting piers which have been found inadequate due to increase in traction and
braking forces, or which have sustained damage caused by corrosion.