3 posts in this topic
By waqar saleem
I have observed that some senior engineers have not been using stiffness modifiers in their designs. What is the concept behind i am not clear . As we design RC for strength, section is cracked and to cater for this cracked section, property modifiers are used as per
ACI 318-11 10.10.4 (stiffness requirement)
ACI 318-11 8.7 (stiffness requirement)
UBC97 1630.1.2 (modelling requirement)
so why whole section is considered in design. is there any other logic which i couldn't understand.
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.
The Øresund bridge is an engineering marvel that connects the Danish capital of Copenhagen to the Swedish city of Malmö.
A cable-stayed bridge runs nearly 8 km (5 miles) to an artificial island where it transitions into a tunnel that runs another 4 km (2.5 miles). The award-winning double-track railway and motorway opened on July 1, 2000.
For more details refer to the following link: