Bridge Expansion Joint/ Slotted Hole
Bridge Expansion Joint/ Slotted Hole
(OP)
Dear All,
I have designed the bridge between two building. Fixed at one end and roller at the other. The bridge at the roller end, rests on a concrete ledge. I have provided the expansion joint based on the formulation of ASCE for building separation. I have certain queries on it :
1- Is building separation formulation is appropriate to provide expansion/moment joint in my case?
2- I am trying to allow the movement through slotted holes in base plate. If my bridge required expansion is 300mm through formulation indicated in Point-1 above, should the slotted hole be twice of it i.e. 2x300mm = 600mm
I am still unsure as to what size the slotted hole should be ? and what governs the expansion joint of bridge over the ledge end.
I am relatively new to bridges. any help would be highly appreciated. Thanks in advance.
I have designed the bridge between two building. Fixed at one end and roller at the other. The bridge at the roller end, rests on a concrete ledge. I have provided the expansion joint based on the formulation of ASCE for building separation. I have certain queries on it :
1- Is building separation formulation is appropriate to provide expansion/moment joint in my case?
2- I am trying to allow the movement through slotted holes in base plate. If my bridge required expansion is 300mm through formulation indicated in Point-1 above, should the slotted hole be twice of it i.e. 2x300mm = 600mm
I am still unsure as to what size the slotted hole should be ? and what governs the expansion joint of bridge over the ledge end.
I am relatively new to bridges. any help would be highly appreciated. Thanks in advance.






RE: Bridge Expansion Joint/ Slotted Hole
RE: Bridge Expansion Joint/ Slotted Hole
RE: Bridge Expansion Joint/ Slotted Hole
RE: Bridge Expansion Joint/ Slotted Hole
@bridgebuster : Dear Bridgebuster, I am also thinking the same as this large movement is increasing my ledge size alot. As 300X2=600mm slotted hole.
The only reason I thought is that I worked out the building displacement at Ultimate LimitState i.e. with modifier.
I have used ASCE building separation formula δMT = SQRT[(δM )2 + (δM )2 ] to workout separation at ledge.
@hokie66 : Dear Hokie66 , even If i use guided slide bearing it should be atleast 600mm ? Right for 300mm expansion joint.
@BUGGAR: Dear BUGGAR, apart from the large movement joint I am getting which Is increasing my ledge size. Other concern I have is can I place one bolt per row of base plate along the ledge ? but problem again is the load dispersion ? would it be possible for a long and narrow base plate ?
RE: Bridge Expansion Joint/ Slotted Hole
RE: Bridge Expansion Joint/ Slotted Hole
That would be really helpful.
RE: Bridge Expansion Joint/ Slotted Hole
RE: Bridge Expansion Joint/ Slotted Hole
RE: Bridge Expansion Joint/ Slotted Hole
RE: Bridge Expansion Joint/ Slotted Hole
RE: Bridge Expansion Joint/ Slotted Hole
RE: Bridge Expansion Joint/ Slotted Hole
If it is the case you should account to the friction force resisting the movement given by the friction-factor*normal force.
RE: Bridge Expansion Joint/ Slotted Hole
@daranguiz . I am designing anchor bolts for shear force as you indicted. I am precisely concerned about what size slotted hole should be. what guidelines are used to calculate the expansion joint / slotted holes for bridges between building.
RE: Bridge Expansion Joint/ Slotted Hole