What is a PT designer?
PT Designer is a computer program for the design and analysis of linear post-tensioned concrete floor systems.
What is post tension design?
Designers use post-tensioning as a way to reinforce concrete by prestressing it. In prestressed members, compressive stresses are introduced into the concrete to reduce tensile stresses resulting from applied loads including the self weight of the member (dead load).
How much tension is on a post tension cable?
A post tension slab is a concrete slab with steel cables running through it that have been placed under 33,000 +/- pounds of tension. This tension makes the concrete slab and foundation much stronger than concrete without reinforcement and helps reduce cracking.
What is PT system?
PT systems provide active reinforcement. The function of post-tensioning is to place the concrete structure under compression in those regions where load causes tensile stress. Post-tensioning applies a compressive stress on the material, which offsets the tensile stress the concrete might face under loading.
How do PT slabs work?
The Post-Tensioning Method Once the concrete has gained sufficient strength the tendons are progressively stressed against the concrete and locked off by special anchors. A bonded system is where the tendons are filled with grout, whereas an unbonded system is where the tendons are not grouted.
Is post tensioning system economical?
Post tensioning is economical for large spans and it reduces the size of section and as well reduction in deadweight. So load on the structural member is reduced due to its self weight reduction.
Is rebar better than post tension?
Post tension foundations are what tract home and apartment builders use so therefore they are lower quality. Post tension foundations don’t work for our soils. Rebar works better here. Those post tension cables can break one day and go flying out and might kill someone.
How do you calculate post tension?
Concrete Volume and Post-Tensioning
- Diameter of Unbonded PT = D = 0.5 inches.
- Weight of PT Strand = w = 0.52 pounds per foot.
- Length of PT Anchor = L = 2.50 inches.
- Height of PT Anchor = H = 5.25 inches.
- Width of PT Anchor = W = approx. 1.25 inch.
Why we use PT slab?
Use of PT slabs results in small sections, better serviceability, durable structures and faster construction compared to reinforced concrete construction. In some cases, it demonstrates an economic alternative to conventional concrete or steel floors.
How long do post tension cables last?
Conventional concrete & rebar foundations last about 20-30 years before failure begins to occur. Post-tension slabs are lasting about 15-20 years and are failing at a much higher rate. Post-tension slabs are created with concrete trenches around the perimeter of the house where the external walls will be placed.
Is post tension cheaper than rebar?
COST: The perception by the public that post tension is a cheap alternative to rebar is 100% true! Everywhere in the US where post tension is familiar, available, and used without negative perception/reception, it results is a lower cost to construct the foundations.
Can you drill a hole in a post tension slab?
PT slabs on ground can be placed and stamped just like with any other concrete slab. Surfaces can be stained or overlaid. The only concern is to always remember not to cut or drill into post-tensioned concrete slabs, since once a tendon has been cut, it is very difficult to repair.
Is code for post tensioning?
IS 1343 1980
Indian standard code of practice for Prestressed Concrete Design IS 1343 1980 had table number 12 for the design of Unbonded post tensioned concrete for varying l/d ratio and reinforcement index. However, the same has been removed in the recent revision of IS 1343-2012.
Who is the Institute of post-tensioning material fabricators?
Members of the Institute include major post-tensioning material fabricators in the U.S., Canada and Mexico, and manufacturers of prestressing materials in the U.S., Canada, Mexico, Asia and Europe, and companies supplying materials, services and equipment used in post-tensioned construction.
Which is the best design software for concrete slab?
RAM Concept RAM Concept is the ultimate structural designer’s solution for post-tensioned and conventionally reinforced slabs, mats, and rafts. RAM Concrete RAM Concrete is fully integrated concrete analysis, design, and drafting software for structural engineers.
What is the easiest software available for structural engineers?
STAAD Pro is one of the easiest software available for structural engineers. Easy user interface, availability of you tube videos for tutorials, openly available on internet gor download etc. are some plus point which makes it easy to use.