Post-Tensioned Slab Foundations in Colorado: Alan F. Claybourn, P.E.
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1 Post-Tensioned Slab Foundations in Colorado: Alan F. Claybourn, P.E. Principal/Manager of Engineering with Kumar and Assoc. Greg Arbour, P.E. Former President of KLG Corporation Jim Houlette, P.E. Director of Structural Engineering at EV Studio Architects and Engineers
2 Introduction to Post Tension Slab-On-Grade Foundations
3 What is Post-Tensioning
4 History And Objectives of the PTI method
5 Foundation Options Deep Foundation Systems
6 Helical Piers or Screw Piles
7 Straight Shaft Drilled Piers
8 Shallow Foundation Systems Spread Footing
9 Interrupted or Narrow Spread Footing
10 Why choose a Post Tensioned Foundation Slab-On-grade? Alternative to deep foundation systems if soils conditions are moderate to high Drilled piers Helical piers Improved slab performance over traditionally reinforced slab-on-grades Crack control Improved performance with less steel and concrete For Residential projects it will eliminate a wood floor at the ground floor Typically reduces excavation costs
11 Design of a Post Tensioned Slab-On-grade Determine if designing by 2 nd or 3 rd Edition The design values are NOT the same
12 Slab Foundation Systems Slab foundations can be designed as: A thin slab (4 to 6 ) with ribs Uniform slab with no ribs PT Slab with ribs
13 Required information prior to starting design Complete Geotechnical Report Maximum Bearing Pressure Edge Moisture Variation Distance, e m Edge lift and center lift Differential Soil Movement, y m Edge lift and Center lift Loads from Structure Gravity Loads Uplift Stiffness Coefficient Consider Drywall, Stucco, and Brick
14 Design Basics for Post-Tensioned Slab-On-Grade Systems Consider soil movement in two ways Center Lift Center of building higher than edge Edge Lift Center of building lower than edge Strength in slab determined by the same basics as any other structural concrete member with the added benefit of compression from the cables. Stress diagram is shifted by 50 to 100psi towards compression.
15 Area 2 Post-Tensioned Slab-On-Grade Design Utilizing the PTI Method Divide the foundation into overlapping rectangles to cover the entire foundation Each rectangle is designed to determine worst case Determine rib locations Maximum spacing of 15ft Locate at point loads & shear walls Preliminary design using software PTISlab by GTK RAMConcept by Bentley ADAPT-SOG by ADAPT Spreadsheet Area 1
16 Continued... Design each rectangle area and then adjust rib depth, rib width, rib spacing, as needed to create a consistent design for all areas. Determine needed effective prestress. 50psi minimum 75 to 100psi to control cracking Typical widths of ribs are 10 to 14. Bearing area is not based solely on rib width.
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19 Post-Tensioned Slab-On-Grade Commercial and Industrial Floors
20 Design and Construction of Post-Tensioned Sport Courts
21 Construction and Maintenance Manual for Post-Tensioned Slab-On-Ground Foundations
22 Materials Concrete
23 Moisture barrier Rules of thumb
24 Post-Tensioning reinforcement
25 Conventional reinforcement
26 Construction Site preparation, Drainage and Final Grading
27 Beams Beam trenching Beam reinforcement Beam Tendons or not Beam penetrations Beam concrete pour Vibration
28 Slabs Slab forming Slab reinforcement Slab penetrations Slab concrete pour Vibration
29 Pre Concrete Pour Observation
30 Stressing Post concrete pour
31 Cracks
32 Repairs
33 Post Construction Issues Drywall cracks Concrete cracks
34 Some causes of damage Improper site remediation Improper site grading Improper site drainage Improper installation of landscaping Structural design Construction defects Materials Installation
35 Resources for Structural Engineers
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