Changes to Bridge Support Conditions
Changes to Bridge Support Conditions
(OP)
Existing bridge has pin - hanger hinges at two locations. Due to their inherent weakness, the pin-hanger details are to be removed by making the girders continuous at the hinge locations. Furthermore, bearings adjacent to the hinge locations have to be changed from fixed to expansion to accommodate the expansion / contraction capability lost by removing the hinges. Please see attached drawing. Original design had 3 fixed and 4 expansion bearings per girder line. Proposed design will have 1 fixed and 6 expansion bearings per girder line.
Assuming that the girder strength is not an issue, what are all the implications associated with changing bearings from fixed to expansion? One such effect would be that the longitudinal braking force is now resisted by only one bearing per girder line.
Thanks.
Assuming that the girder strength is not an issue, what are all the implications associated with changing bearings from fixed to expansion? One such effect would be that the longitudinal braking force is now resisted by only one bearing per girder line.
Thanks.






RE: Changes to Bridge Support Conditions
1. End piers expansion joints will have to replaced for larger movement.
2. Old expansion bearings need to be checked for larger movements.
3. Fixed pier will take majority of seismic force along the bridge.
Yakpol
RE: Changes to Bridge Support Conditions
RE: Changes to Bridge Support Conditions
RE: Changes to Bridge Support Conditions
RE: Changes to Bridge Support Conditions
RE: Changes to Bridge Support Conditions
Proposal is to jack at bearing location, replace bearings, disable pins, make girders continuous at the hinges and then re-deck.
RE: Changes to Bridge Support Conditions
RE: Changes to Bridge Support Conditions
Alternately, you could add a support under the connection like I believe chicopee was referring to. I found a detail online: http://w