|
Cooper River Bridge Figures 4.15 - 4.27
|
|
Figure
|
Description
|
Thumbnail
|
|
4.15
|
The three span bridge is constructed by erecting subassemblages for each half of the bridge which cantilever out into the main span. In this photo, one half has already been erected, and the subsequent Figures will show construction of the second half, and finally, closure of the main span.
|
|
|
4.16
|
A view of the completed half-span. Note how the transverse floor beams frame into the panel point on the lower chord. These floor beams will support the longitudinal stringer beams refered to previously.
|
|
|
4.17
|
Subassemblages are preassembled on shore and transported out on barges to be erected.
|
|
|
4.18
|
Construction begins on one of the mid piers of the bridge.
|
|
|
4.19
|
Each side is erected separately. Note that care must be taken to stabilize the planar trusses during construction.
|
|
|
4.20
|
Permanent cross members are erected to form a stable structure. Note the use of temporary tie downs on either side of the pier.
|
|
|
4.21
|
Detailed view of connection between truss and temporary tie downs.
|
|
|
4.22
|
Erection of the truss continues outward from the pier. The erection sequence is planned to minimize eccentric loads on the pier by balancing construction on each side.
|
|
|
4.23
|
Continuation of balanced construction.
|
|
|
4.24
|
View of support detail over inner pier. This is designed as a pinned support to allow rotation due to unbalanced loads. It prevents the transmission of large bending moments from the truss to the pier.
|
|
|
4.25
|
Where possible, large sections of the truss are erected in one pier. Note how during construction, the section of truss shown in this photo will be simply supported at one end by the pier and at the other by the trusswork already erected.
|
|
|
4.26
|
This is a close up view of the field bolted gussett plate connection for connecting section of the trusses. Bolts are 11/8 in. in diameter and made of galvanized A325 steel.
|
|
|
4.27
|
Connection of sidespan truss to outer pier. Note the location and spacing of the floor beams and the in-plane bracing in the floor.
|
|
