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Saiful Islam Zaber

Connecting Building With Bridge

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I  am  designing  a skybridge connecting two buildings at 20m above ground. Bridge length is 22m. The Bridge is double storied. One Supporting end will be hinge support and another roller ( as there will be expansion gap). Does anyone have similar type of  experience.. ??     

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Edited by Saiful Islam Zaber

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Hello,

i don’t have the specific experience but wouldn’t mind discussing it. You can share your truss connections concepts and I am willing to provide feedback on it.

Also, there is a similar topic on forum that you might find useful.

Thanks.

 

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Roller End of the bridge Will be on neoprene Pad on column capital and hinge end of the truss will  be on column capital attached with anchor bolts. Actually there are three bridges , One of them will rest on beam , the Support reaction is about 35 ton . We have decide to make ledge Beam to support bridge. But the problem is beam depth is also limited to 24 in by architect.       

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7 hours ago, Saiful Islam Zaber said:

Roller End of the bridge Will be on neoprene Pad on column capital and hinge end of the truss will  be on column capital attached with anchor bolts. Actually there are three bridges , One of them will rest on beam , the Support reaction is about 35 ton . We have decide to make ledge Beam to support bridge. But the problem is beam depth is also limited to 24 in by architect.       

You don't need a ledge beam when you can use a truss. I think ledge beam is redundant. Neoprene pad is good on the roller side. If you can share some sketches, I would happily comment on them.

Thanks.

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Looks good. You can also have a corbel on the underside of the beam as part of column. That would make load transfer more smooth and make the connection redundant (If corbel fails, you still have the beam).

Thanks.

 

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With connections design you have to be very careful. As you mentioned one end is going to be hinged and other will be roller, Your truss on each side will have a certain width and it wont be resting with one support connection. I mean at each end the truss will have two or three connection points with the beam or corbel. So when you say hinged it be virtually not hinged and will become a kind of fix connection as the number of anchor bolts on each point will be bore than two. So check your building movements in worst cases, like seismic and wind etc and design the slotted hole connections by giving appropriate movement at the joint. 

For the roller connection you will use the rubber pads any type but you must make vertical pins through sleeves on corbel beam or any connection through your bridge to restrict the dislocation of your truss form the pad. Normally the rubber pads come with these pins and slotted holes are provided in the truss base plates which help them to restrict movements. See Granor Rubber Pad bearings for bridges.     

I have attached two examples of what I have said above. I hope they make any sense to you.

Bridge Connection.pdf

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