Description
This publication is a revision to the DC10.5-12 combined standard that includes the inclusion of stable soils as well as other additions. The intention of the publication is to provide licensed design professionals with soil parameters, internal forces and stiffness requirements that are used for design of ribbed and uniform-thickness post-tensioned foundations on expansive and stable soils.
Note: This publication contains an update to the Standards published in DC10.5-12: Standard Requirements for Design and Analysis of Shallow Post-Tensioned Concrete Foundations on Expansive Soils. Updates include:
• inclusion of stable soils
• definition of PTI foundation types (PTI-1 through PTI -3)
• definition of non-compliant rectangle, primary design rectangle, and secondary design rectangle
• shape factor recommendations
• rib continuity
• edge drop moment calculation requirements
48 pages; 8½ x 11 in. (soft cover)
Published June 2019
Table of Contents
Table of Contents
1.0 — SCOPE
2.0 — DEFINITIONS AND ABBREVIATIONS
2.1 — Definitions
2.2 — Abbreviations
3.0 — NOTATION
4.0 — STRUCTURAL ANALYSIS AND DESIGN
4.1 — General
4.1.1 — Overlapping rectangles
4.1.2 — Perimeter load
4.1.3 — Concentrated loads
4.1.4 — Loss of prestress
4.2 — Ribbed foundations
4.2.1 — Minimum slab thickness
4.2.2 — Ribs
4.2.3 — Minimum prestress force for ribbed foundations
4.2.4 — Soil-bearing pressure
4.3 — Uniform thickness foundations (UTFs)
4.3.1 — UTF conversion
4.3.2 — Minimum prestress force for UTFs
4.3.3 — Soil-bearing pressure
5.0 — FLEXURE
5.1 — Edge drop
5.1.1 — Long direction
5.1.2 — Short direction
5.2 — Edge lift
5.2.1 — Long direction
5.2.2 —Short direction
5.3 — Allowable stress
5.4 — Cracked sections
6.0 — SHEAR
6.1 — Applied concrete shear stress
6.1.1 — Ribbed foundations
6.1.2 — UTFs
6.2 — Edge drop
6.2.1 — Long direction
6.2.2 — Short direction
6.3 — Edge lift
6.3.1 — Long and short direction
6.4 — Allowable stress
7.0 — STIFFNESS
8.0 — GENERAL
8.1 — Soils
8.1.1 — Field investigation and laboratory testing
8.1.2 — Expansive soils
9.0 — SOIL PARAMETERS
9.1 — Edge moisture variation distance em
9.1.1 — Soil parameters
9.1.3 — Modified unsaturated diffusion coefficient α′
9.1.4 — Weighted average of α′
9.1.5 — Determination of em
9.2 — Differential soil movement ym
9.2.1 — Determination of ym by computer methods
9.2.2 — Determination of ym by other methods
9.3 — Moisture barriers
9.3.1 — Vertical barriers
9.3.2 — Horizontal barriers
10.0 — MATERIALS
10.1 — Concrete
10.2 — Reinforcement
10.2.1 — Prestressed reinforcement
10.2.2 — Non-prestressed reinforcement
10.2.3 — Cover to reinforcement
10.3 — Anchors
10.4 — Durability
11.0— REFERENCES
11.1 — Referenced standards and reports
11.2 — Cited references
APPENDIX