Sorry, should have mentioned it before, yes the tendons are cut off. The elongations are ok, i would think so. Basically one beam we stressed to 35%fpu, and the other to 70%. The elongations for the side of initial prestress is 8mm for both beams, and for the other side, 70%fpu beam has 20mm...
Thank you guys so much, i just saw all the posts now, which were very helpful, again thank you for taking your time. Ingenuity, rapt i spoke to the guy, i think he was a little ashamed, and then said, the calibration could have only been of by a very small amount, if any, and i should mention...
Hello People, i have a question i would like to ask, at this point it may sound stupid, but i don't want to make any mistakes. OK, so, a guy came in to my college to stress my beams (for my final year project), and the stress that he put in was 535, that's what he said, without given the units...
Hi guys, i am doing a thesis on partially prestressed concrete beams and can't seem to predict the crack widths of my beam. Could anyone point me to the right direction and tell me where i could find a formula for the crack width of partially prestressed concrete? The examples that i did ended...
That's very intresting, you used a parabollic shape for the tendon profile? I would have thought you could go beyond 155kN with a 15.2mm strand, having said that, your objective was to break it so you probably did not stress it in stages? That's very intreating, thanks for sharing.
The objective is to measure the losses experimentally of both beams. Beam 1 eill be HS(high stressed) while beam 2 will be (low stressed). I want to measure the losses occuring in both beams experimentally and compare them theoretically paying most attention to the draw-in loss which seems to be...
The preliminary beam section is b = 250mm, d = 350mm. I am still doing research, changing parameters, and becoming more familiar with PT, as we have not done much in lectures. The section size was another area i was looking in to and trying to decide if everything would fit e.g additional...
Ingenuity,
Yes i see it now, the person that will help me with the actual stressing(due to safety reasons) showed me the "PTSE flat anchorage" system and said that it will be a 7-wire strand, he must have made a mistake, meaning it will be a 5-wire strand. Will try to get my hands on a load...
Rapt,
The anchorage system i will be using is very similar to "PTSE Flat Anchorage" system available on tensa post-tensioning manual, and the tendon is made out of 7 wire strands. Sorry i was wrong in saying multi-strand, the strand will be mono-stressed as my beam will only have 1.
Anchorage is a flat type,7 strands make up a tendon, and i will only be having 1 tendon per beam. I have seen the those load cells you are talking about, my lab facility does not have them, i will look into it and try to obtain it. So from my understanding, having load cells connected at both...
Thanks for replying so fast, i should have given more information, i am building 2 post-tensioned beams for my bachelor degree thesis. The reason why i want to verify PT losses experimentally is because my beams will be very short(3.5m), making the losses very big, especially the anchorage...
Hi guys,
I am building a rectangular beam which will be post-tensioned and bonded, i have calculated my theoretical losses due to Friction, anchorage draw-in, etc. My question is this, is there any way of measuring the losses experimentally ? I know that you probably can't measure them...
