Design Guidelines for bridge expansion joints
Design Guidelines for bridge expansion joints
(OP)
Please I need design guidelines for the bridge expansion joints
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Design Guidelines for bridge expansion joints
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Design Guidelines for bridge expansion jointsDesign Guidelines for bridge expansion joints(OP)
Please I need design guidelines for the bridge expansion joints
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RE: Design Guidelines for bridge expansion joints
RE: Design Guidelines for bridge expansion joints
Take a look at several state DOT bridge design manuals and you will be able to find an appropriate joint type. For most short bridges, a strip seal will be approriate.
The previous post by civil person stated that joints are not needed up to 1100 feet. Tennessee has some long bridges without joints but this is not the norm. Most states limit expansion length to around 400 feet and limit the skew to 30 degrees. The bridge also requires special detailing to allow flexibility in the substructure to accomodate the thermal movements. If you are interested in eliminating joints, do a search for the proccedings from the jointless bridge conference held in Baltimore a couple years ago.
RE: Design Guidelines for bridge expansion joints
All countries have expansion joint requirements in one or other code. In the USA and Canada, each State/Province do too. The joint manufacturer will be able to say if they comply with the specific requirements of the country/province/state.
I could not agree more, expansion joints are a pain in the neck, but they are also necessary. 1100 feet are 335 meters, with thermal coeficient of 12E-6, and a temperature range of 50 degrees you have an expansion of 200 mm. If you do not install an expansion joint those 200 mm are either going to cause a lot of stresses or a lot of cracks. That is without talking about braking forces, settlements, bearing movements,...
RE: Design Guidelines for bridge expansion joints
RE: Design Guidelines for bridge expansion joints
RE: Design Guidelines for bridge expansion joints
Here in the US, many DOTs have specific guidelines for expansion joints. Only certain bridges are allowed to be designed integral or jointless. For these, we take the expansion back to a pavement joint off the bridge. We allow piles to move in their holes, and do not generally design the superstructure for axial constraint due to temperature change. This would be a huge force compared to the force required to deform the backfill.
RE: Design Guidelines for bridge expansion joints
As I said, I do not like expansion joints, but I think that they are a necessary evil. Any bridge can be designed to take the additional axial loads, I would be more concerned about the abutments being able to provide that restraint and the approaches performing well. Even if you design for axial loads, some movement is bound to take place, and the ciclic load might cause trouble.
On the other hand I have never worked on an integral bridge and obviously Civilperson has had successfull projects with them. Maybe it is time I re-think my approach. Could more people comment on their experience/oppinion/approach to this issue?
RE: Design Guidelines for bridge expansion joints
Over 60m I think you need pretty large abutments to withstand the expansion forces. If you go for a flexible pile solution, you can struggle with horizontal movement at the ends of the bridge
RE: Design Guidelines for bridge expansion joints
RE: Design Guidelines for bridge expansion joints
RE: Design Guidelines for bridge expansion joints
on a prestressed bridge of 645m the movement due to shrinkage and creep and the max movement due to temperature differential will be considerable (I guess over 300mm). Either the columns will deflect or there will be sliding bearings. Sounds as if in your case sliding bearings have been used. Perhaps a couple of expansion joints and the remaining piers designed as built-in would have been an economic solution
RE: Design Guidelines for bridge expansion joints
Out of eight piers two are fixed and the rest are expansion type, which allow movement.
RE: Design Guidelines for bridge expansion joints
RE: Design Guidelines for bridge expansion joints
RE: Design Guidelines for bridge expansion joints
If you only have expansion dams at the two ends with 645 m of structure between, how do you avoid considering the entire length for temperature deformation?
RE: Design Guidelines for bridge expansion joints
RE: Design Guidelines for bridge expansion joints