Post-installed anchors usually have a 5 degree allowance based upon the ACI POST INSTALLED ANCHOR CERTIFICATION notes. I will try and clip a copy when I am back in the office.
With this statement: "Since the post-tensioned tendons already provide uniform balancing load of 80% dead load, I would think I only need 20% of dead load..." the OP implied intent to use only 0.2D on the DEMAND side for seismic and not 1.0D (excluding factored loads etc.), which is clearly...
That is not how it works, there is no 'free lunch'.
[SCARCASM ON] Maybe if we provide more PT and 'balance' 125% of DL we could design for -25% of DL :-) [SCARCASM OFF]
You must design for 100% of your dead loads, etc., with appropriate strength factor.
Extending your logic, you would only...
That 'silly French construct' that most of the world had adopted, most especially in this digital age. Vive la France!!
Damn, I detest adding up fractions of length measurement in the field.
Metric all day, every day!
Then the 'style police' will hunt you all down and get you. :)
From: stylemanual.gov.au
Put a non-breaking space between numbers and units
People will read the number and its unit as a measurement only if the 2 components sit together. To do this, use a non-breaking space between numbers and...
Very badly thought out location of the pour strip!
The shape of the pour strip could have been reconfigured to better incorporate the balcony...but that is in the past.
Based on the drawing you show there is one (1) tendon terminated on the RHS of the pour strip in the 2' concrete segment...
dik:
AU does not permit unbonded PT - except for SOG - so the tendon sheath in this situation is galvanized flat ducting with up to 5 strands to form a bonded (grouted) tendon. Each strand is stressed with a mono strand jack.
Stressing to elongation is definitely NOT the correct approach.
Always stress to force using a calibrated hydraulic system and account for the elongation shortcomings as best as possible.
For pan stressing a series of curved stressing barrels is used and the friction of these acute angles...
Several (all?) of those column photos seem to show that they have been surface patched and the cracking our see is due to plastic shrinkage of the patching material.
Are you the EoR? If so, request a copy of photos immediately after the forms were removed and also what cementious patching...
Are only three PT anchorages applicable here or is it over a significant slab edge with more anchorages in play?
If only three anchorages: I would carefully chip the slab edge to remove the existing grease/wire brush marks to the concrete, trim the existing tails using an abrasive grinder to...
As a HP-41CV user since 1982 I now own and use SwissMicros DM41X, DM42 and DM15L. No issues with any of my SwissMicros units.
I also have several HP35S that I use in the field.
And i41CX+ from AL SOFTWARE for my iPhone and iPad.
A fan of RPN for a long time!
Given you are in the US and it is a house slab I am going to assume it is UNbonded PT.
Where is the new footing to be placed in relation to the existing PT anchorages?
If it is remote from the PT anchorages - say more than 3 or 4 feet away - you may not have to cut the tendon/s, just work...
True, but if there is sufficient epoxy coating to the alum rod (say a pre-applied and cured 1st coat) then it may not be as deleterious as alum-to-concrete contact.
