360R-38 101Introduction 102Applicable design procedures 103Slabs post-tensioned for crack control 104Industrial slabs with post-tensioned reinforcement for structural support Chapter 11Fiber-reinforced concrete slabs-on-ground p. We can provide cost estimates and detailed design for you next Design Example.
Post Tension Slab On Grade Foundation Evstudio
Extend horizontally from center line column at least 16 center line span.
. Astm a615 grade 60. The following example illustrates the design methods presented in ACI 318-05 and IBC 2003. Chapter 10Design of post-tensioned slabs-on-ground p.
The most common post-tensioning material is half-inch diameter 270k prestressing strand. In this context design is defined. 8142002 91711 PM.
For example a 5-inch slab can support a 5000-pound post. Appendix 5Design example using shrinkagecompensating concrete. 1150 Floating slab design example In this example with the sub-grade comprising a consistent medium dense sand How Does Someone Design a Concrete Slab on.
The compressive stresses resist the anticipated tension stresses induced by the soil movements enhancing the performance over a non-prestressed foundation. Vci 0 100 200 300 400 500. Therefore Span Ratio m 1319 068.
Cast-in-place flat slab bridge design lrfd design example table of contents 1 of 1. Post-tensioning is very popular for slab-on-grade construction in some areas of the country. Flat Slab wDrop Panels TwoWay Twoway Slabs.
CONCRETE FLOOR SLABS ON GRADE SUBJECTED TO A PPENDIX C. DESIGN EXAMPLE S The structural design of a concrete floor slab on grade is primarily controlled by SLAB DESIGN AUGUST 2014 For example a post-tensioned 100 m span will cost in cost between reinforced and post-tensioned concrete flat slabs also increases. The PTI Design Procedure is used to design a slab-on grade foundation that will respond elastically to forces the foundation is exposed to including those that are the consequence of soil pressure and soil deformation.
This is especially true for super-flat industrial floors and areas susceptible to expansive soil. A good rule of thumb is for every inch of slab thickness a 1000-pound post load can be supported. The example presented here is for Two-Way Post-Tensioned Design.
For a lightly loaded industrial floor the slab is placed 4 inches thick with tendons in both directions at 2- to 5-foot intervals. A52Example selecting the optimum amount of reinforcement to maximize the compressive. Design a slab with the following details.
Post-Tensioned Concrete Slabs-on-Ground Author. A post-tensioned prestressed banded flat slab floor system for an office complex is shown in figure1 together with atypical sub-frame section. As a rough guideline structural floor slabs not SOG have an average compression stress of about 200 psi and SOG should be about 13 of this as a rough start for preliminary design You need to understand the loading the slab.
The structure is checked both at. Ings post-tensioned slabs are strong enough to carry moderate loads directly. A Post Tension PT slab-on-grade SOG foundation is based on a typical raft SOG foundation with one major difference.
Market for Post-Tensioning Tendons. Equivalent tensile stress design. When planning for point loads a safe rule of thumb is to figure on 1000 pounds per inch of slab thick-ness.
The ratio of the stiffness of the slab to the stiffness of the foundation. Dik Structural 12 Jan 07 0826. A3-Design examples using COE charts A4-Slab design using post-tensioning A5-Shrinkage-compensatingconcreteexamples CHAPTER l-INTRODUCTION ll-Purpose and scope Consistent with the mission of ACI Committee 360 this report presents state-of-the-art information on the design of slabs on grade.
Lets take an example of two-way slab design. The following graph in Figure 13 was made to show the shear distribution along the post-tensioned slab. Post-tensioned slabs-on-ground provide a cost-efficient high-performance solution for problems associated with ground-supported residential foundations on shrink-swell soils.
The PTI design method incorporates slabs with exterior to 18 inches below the lowest adjacent grade. Framing Dead Load selfweight Superrimposed Dead Load 25 psf partitions ME misc. Post tensioned concrete slabs on grade offer solutions for large areas with Slab on Grade.
So this is how to design a 2 way spanning slab using BS8110. 15 to 20 for a wheel or post spacing of 3 to 4. 7a shows a unit slab element subjected to a constant normal pressure σ and a shear.
Post-Tension Analysis Shear strength Using the shear design method found in the PCI Design Handbook Precast and Prestressed Concrete 6th Edition the shear values were calculated at 3 ft 8 ft 12 ft and 18 ft from the support. Post-tensioning in buildings is not limited to floor slabs. In addition to resisting soil movement post-tensioned slabs have excellent load capacity and effectively remove the need for isolated pad footings from the foundation.
Approximately 0 to 5. Post-Tensioning Institutes Design of Post-Tensioned Slabs-on-Ground PTI Design Procedure 3rd Edition 13. Developers architects engineers contractors educators and.
Post-tensioning to minimize cracking. It looks about right for 75 psi. A 5-inch post-tensioned slab can handle up to 5000 pounds and a typi-cal 9-inch-thick slab will bear a concen-trated 9000-pound load.
In a post-tensioned slab on grade a grid of high-strength post-tensioning tendons replaces the welded wire fabric or conventional rebar normally used. This report addresses the design and detailing of shallow foundations such as those shown in Fig. 3 0 - 4 0 f t.
For wheel or post spacings of 5 to 15 the increase in stress is. High strength steel tendons pulled into tension. PT Slab-on-grade concrete slab not shown to see tendons.
Design publications and software for Post Tensioned slabs on grade. Two-way slab design by direct design method as per ACI 318-11 step by step procedure and limitations of a direct design method for the two-way slab is presented. Two Way Post-tension Flat Slabs.
POST-TENSIONED CONCRETE IN BUILDING CONSTRUCTION - POST-TENSIONED FOUNDATIONS 1. Post-tensioning of foundations transfer beams and plates post-tensioned masonry and the combination of precast elements with cast-in-place concrete by means of post-tensioning offer other interesting opportunities. Ken Bondy Created Date.
For 6 to 10 thick slabs on grade with k values between 100 pci and 200. Slab-on-Ground Design by Using the PTI Ken Bondy Method. A 2 2Area 2 A c 2 2 Post-Tensioned Concrete Design Table 1-1 List of Symbols Used in the ACI 318-08 Code cp Area enclosed by the outside perimeter of the section in A g Gross area of concrete in A 2 l Total area of longitudinal reinforcement to resist torsion in A o Area enclosed by the shear flow path sq-in A oh Area enclosed by the centerline of the outermost closed.
For example a 5-inch slab can support a 5000-pound post load without. Tendons are typically ½ diameter made of 7 steel wire strands that is then greased and encased in a plastic coating. Design of PostTensioning Building Structures March 12 2020 2020 EduCode Las Vegas PTI 22.
Appendix 4Slab design using post-tensioning. Similar considerations apply to the. Unless otherwise noted all referenced table figure and equation numbers are from these books.
Post-tension Flat Slab Design Example.
2
2
How To Read Post Tensioned Slab Drawing Plans At Site Its Profiling Etc Youtube
Doe Building Foundations Section 4 2 Post Tensioned Concrete
2
2
Post Tension Slab Working Principle Components And Construction The Constructor
Post Tension Slab Design Basic Concept Youtube
0 comments
Post a Comment