GRDSLAB screenshot
SOFTWARE :GRDSLAB
DEVELOPER :Alex Tomanovich
VERSION :1.9
PLATFORM :Spreadsheet
FILE SIZE :1.53 MB
LICENSE :Freeware
DOWNLOADS :UserDownloads:9056
GRDSLAB Description

GRDSLAB is a spreadsheet program written in MS-Excel for the purpose of analysis of concrete slabs on grade. Specifically, a concrete slab on grade may be subjected to concentrated post or wheel loading. Then for the given parameters, the slab flexural, bearing, and shear stresses are checked, the estimated crack width is determined, the minimum required distribution reinforcing is determined, and the bearing stress on the dowels at construction joints is checked. Also, design charts from the Portland Cement Association (PCA) are included to provide an additional method for determining/checking required slab thickness for flexure. The ability to analyze the capacity of a slab on grade subjected to continuous wall (line-type) load as well as stationary, uniformly distributed live loads is also provided.

Program Assumptions and Limitations:

1. This program is based on the following references:

  • "Load Testing of Instumented Pavement Sections - Improved Techniques for Appling the Finite Element Method to Strain Predition in PCC Pavement Structures" - by University of Minnesota, Department of Civil Engineering (submitted to MN/DOT, March 24, 2002)
  • "Principles of Pavement Design" - by E.J. Yoder and M.W. Witczak (John Wiley & Sons, 1975)
  • "Design of Concrete Structures" - by Winter, Urquhart, O'Rourke, and Nilson" - (McGraw-Hill, 1962)
  • "Dowel Bar Opimization: Phases I and II - Final Report" - by Max L. Porter (Iowa State University, 2001)
  • "Design of Slabs-on-Ground" - ACI 360R-06 - by American Concrete Institute
  • "Slab Thickness Design for Industrial Concrete Floors on Grade" (IS195.01D) - by Robert G. Packard (Portland Cement Association, 1976)
  • "Concrete Floor Slabs on Grade Subjected to Heavy Loads" Army Technical Manual TM 5-809-12, Air Force Manual AFM 88-3, Chapter 15 (1987)
  • "Streses and Stains in Rigid Pavements" (Lecture Notes 3) - by Charles Nunoo, Ph.D., P.E. (Florida International University, Miami FL - Fall 2002)

2. The "Slab on Grade" worksheet assumes a structurally unreinforced slab, ACI-360"Type B", reinforced only for shrinkage and temperature.An interior load condition is assumed for flexural analysis.That is, the concentrated post or wheel load is assumed to be well away from a "free" slab edge or corner.The original theory and equations by H.M. Westergaard (1926) as modified by Reference (a) in item #1 above are used forthe flexual stress analysis.Some of the more significant simplifying assumptions made in the Westergaard analysis model are as follows:

  • Slab acts as a homogenous, isotropic elastic solid in equilibrium, with no discontinuities.
  • Slab is of uniform thickness, and the neutral axis is at mid-depth.
  • All forces act normal to the surface (shear and friction forces are assumed to be negligible).
  • Deformation within the elements, normal to slab surface, are considered.
  • Shear deformation is negligible.
  • Slab is considered infinite for center loading and semi-infinite for edge loading.
  • Load at interior and corner of slab distributed uniformly of a circular contact area.
  • Full contact (support) between the slab and foundation.

3. Other basic assumptions used in the flexural analysis of the "Slab on Grade" worksheet are as follows:

  • Slab viewed as a plate on a liquid foundation with full subgrade contact (subgrade modeled as a series of independent springs - also known as "Winkler" foundation.)
  • Modulus of subgrade reaction ("k") is used to represent the subgrade.
  • Slab is considered as unreinforced concrete beam, so that any contribution made to flexural strength by the inclusion of distribution reinforcement is neglected.
  • Combination of flexural and direct tensile stresses will result in transverse and longitudinal cracks.
  • Supporting subbase and/or subgrade act as elastic material, regaining position after application of load.

4. The "Slab on Grade" worksheet allows the user to account for the effect of an additional post or wheel load. The increase in stress, 'i', due to a 2nd wheel (or post) load expressed as a percentage of stress for a single wheel (or post) load and is to be input by the user.Refer to the input comment box for recommendations.

5. All four (4) worksheets pertaining to the PCA Figures 3, 7a, 7b, and 7c from Reference (f) in item #1 above are based on interior load condition and other similar assumptions used in the "Slab on Grade" worksheet. Other assumed values used in the development of the Figures 3, 7a, 7b, and 7c are as follows:

  • Modulus of elasticity for concrete, Ec = 4, 000, 000 psi.
  • Poisson's Ratio for concrete, m = 0.15.

6. In the four (4) worksheets pertaining to the PCA Figures 3, 7a, 7b, and 7c, the user must manually determine (read) the required slab thickness from the design chart and must manually input that thickness in the appropriate cell at the bottom of the page.An interation or two may be required, as when the slab thickness is input, it may/may not change the effective contact area.Note:the user may unprotect the worksheet (no password is required) and access the Drawing Toolbar (select: View, Toolbars, and Drawing) to manually draw in (superimpose) the lines on the chart which are used to determine the required slab thickness.

7.This program contains numerous “comment boxes” which contain a wide variety of information including explanations of input or output items, equations used, data tables, etc.(Note:presence of a “comment box” is denoted by a “red triangle” in the upper right-hand corner of a cell.Merely move the mouse pointer to the desired cell to view the contents of that particular "comment box".)

* GRDSLAB download link provides freeware version of the software.

Similar Software
DECKSLAB Version:1.4 · Alex Tomanovich
DECKSLAB

Slab on Metal Deck Analysis & Design

Slab on metal deck analysis and design (both composite and form deck) per SDI and ACI 318-99.

spMats Version:8.50 · StructurePoint
spMats

Design And Investigation of Concrete Foundations, Mats, Combined Footings, Pile Caps, Slabs On Grade

spMats is highly efficient and widely used for analysis, design and investigation of commercial building foundations and industrial mats and slabs on grade.

POLEFDN Version:2.3 · Alex Tomanovich
POLEFDN

Pole Foundation Analysis

POLEFDN is a spreadsheet program written in MS-Excel for the purpose of analysis of a pole foundation assuming the use of a rigid round pier which is assumed free at the top and subjected to lateral and vertical loads.

FOOTINGS Version:3.7 · Alex Tomanovich
FOOTINGS

Rectangular Spread Footing Analysis

FOOTINGS is a spreadsheet program written in MS-Excel for the purpose of analysis of rigid rectangular spread footings with up to 8 total piers, and for either uniaxial or biaxial resultant eccentricities.

BOEF Version:1.6 · Alex Tomanovich
BOEF

Beam on Elastic Foundation Analysis

BOEF is a spreadsheet program written in MS-Excel for the purpose of analysis a finite length beam with free ends supported continuously on an elastic foundation.

ASCE705W Version:1.4 · Alex Tomanovich
ASCE705W

Wind Loading Analysis Per The Asce 7-05 Code

ASCE705W is a spreadsheet program written in MS-Excel for the purpose of wind loading analysis for buildings and structures per the ASCE 7-05 Code.

Comments & Reviews About GRDSLAB
Marcelo Gerez
Marcelo Gerez · 30 Nov 2020

Excelente material. He usado con muy buenos resultados GRDSLAB. Gracias por compartir.

Mario Manzano
Mario Manzano · 28 May 2018

Excellent spreadsheet

Submit a review about GRDSLAB software with your social media profile

avatar
Rate This Software

GRDSLAB has been rated 4.0 out of 5 points. A total of 13 votes cast and 2 users reviewed the software.

Most Popular Structural Analysis Downloads

34615 hitsLTBeam 1.0.11

LTBeam is a software which deals with the elastic Lateral Torsional Buckling of Beams under bending action about their major axis.

16522 hitsFTOOL 4.0

Ftool provides a simple analysis program that merges, in the same interface, resources for effective creation and manipulation of the model, linked to a fast and effective code for visualization of the results.

14716 hitsEBPlate 2.01

EBPlate is a piece of software developed by CTICM with a partial funding of the European Research Fund for Coal and Steel (RFCS). It assesses the critical stresses associated to the elastic buckling of plates loaded in their plan.

12262 hitsBASEPLT9 3.7

BASEPLT9 is a spreadsheet program written in MS-Excel for the purpose of analysis of steel column base plates.

Recently Added Structural Analysis Software

18 Jun1•2•Build 2.03

1•2•Build is the ideal software to easily design beams, columns and simple 2D structures in steel, concrete of timber.

21 MayADAPT-FELT 2017

Easily layout tendons and calculate short and long term losses due to friction, elongation, creep, shrinkage and elastic shortening in accordance with ACI Committee 423.

30 AprSkyCiv 2021

SkyCiv is a Structural Engineering software platform with a range of structural analysis and design software based on the cloud.

16 AprADAPT-PT/RC 2019.1

Straightforward investigation and optimization of reinforced concrete and post-tensioned beams and slabs in accordance to a variety of international design standards.