Hi Dr. David. Thanks for the presentation. Consider that some DOTs require refined analysis to use the transformed section properties. We don't need to add elastic shortening loss at the end if we use transformed section properties, right? Thanks
@davidgarber16643 жыл бұрын
Hi Bowen. Good comment. You are correct. You do not need to add elastic shortening loss if you use transformed section properties to find your stresses. Elastic deformations are implicitly accounted for when using transformed section properties. You can use your jacking stress for finding release stresses and jacking stress minus long-term loss when finding stresses at other times.
@bowenyang52392 жыл бұрын
@@davidgarber1664 Thanks very much, Dr. David. Got it! That makes sense to me!
@nandaganeshkudva53824 жыл бұрын
Design a pre-stressed concrete beam as Type - 1 member to carry a superimposed load of 12kN/m over a simply supported span of 25m. The permissible stress in compression for concrete at transfer and working loads are 14M/mm2 and 12N/mm2 respectively. Initial stress in pre- stressing cable is 1000N/mm2 . Loss of pre-stress is 20%. Adopt Freyssenet cables each of 12 wires of 5mm diameter Can you solve this above problem
@NeerajKumar-yj2ty3 жыл бұрын
Can u give the link for this 2017 version code book
@davidgarber16643 жыл бұрын
AASHTO LRFD Bridge Design Specification 8th Edition (store.transportation.org/Item/PublicationDetail?ID=3888). There is a 9th Edition that is now available as well (store.transportation.org/Item/PublicationDetail/4403?NoCategory); I have not updated examples for this edition yet.