Spread Footing Analysis & Design Charts:

• Introduction

• Notations

• Main Chart

Concentric Load:

• Preliminary Size

• Ultimate Forces

Eccentric Loads:

• Preliminary Size

• Ultimate Soil Pressure with Flexural Equations

• Ultimate Soil Pressure with Equilibrium Equations

Footing Design:

• One Way Shear Capacity

• Two Way Shear Capacity

• Reinforcement

• Tension Rebar Development

• Concrete Bearing

• Dowels Rebar Development

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Concrete Beam Design Charts:

• Introduction

• Notations

• Moment Strength of Rectangular Beam

• Rectangular Beam:

  • with Tension Reinforcement

  • with Tension & Compression Reinforcement:

    • Page 1

    • Page 2

• Moment Strength of T-Section Beam

  • T-Section Case 1

  • T-Secetion Case 2

Beam Shear Design

• Introduction

• Notations

• Beam Shear Basic Chart

• Beam Shear Detailed Chart:

  • Page 1

  • Page 2

  • Page 3

  • Page 4

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Concrete Column Design Charts:

• introduction

• Notations

Interaction Diagram Points:

• Interaction Diagram Main Points

• Axial Compression at Zero Eccentricity

• Maximum Compression Load at zero Eccentricity

• Strength Reduction Factor f

• Maximum Moment Strength at Maximum Compression

• Axial Comp. and Moment at Zero Strain

• Axial Comp. and Moment at 50% Strain

• Axial Comp. and Moment at Balanced Condition

• Moment at Zero Axial

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Concrete Column Interaction Diagrams

Design concrete columns never been simpler. Click here for ready-to-use column strength interaction diagrams

Introduction to Concrete Beam Shear Design  

Introduction and discussion:

The approach of the beam shear check chart is to define the nominal shear strength of the concrete, then compare it with the ultimate shear force at the critical section, and subsequent sections. Shear reinforcement calculation is performed, where applicable.

The shear charts are presented into two parts. One is the Shear Basic Chart, which is outlining the main procedures of the shear design in accordance with ACI applicable code provisions. The second, Shear Detailed Chart, is outlining the steps required for repetitive shear check. The detailed charts provide as much variables and or scenarios as needed to facilitate the creation of automated shear check applications.

The concept in selecting stirrups is based on an input of the bar diameter (d_b) of the stirrups to be used, usually #3, 4, or 5, as well as the number of legs and thus finding the spacing (s) required.

The shear chart intentionally did not include the following ACI provisions due to practical and economical justifications:

• Detailed method of ACI §11.3.2.1 for calculating nominal shear strength of concrete, v_c . The reason is the value V_ud/M_u is not constant along the beam span. Although the stirrups spacing resulting from the detailed method may be 1.5 larger than that of the direct method using ACI 11.3.1.1 at the critical section only, the use of the detailed method is not practically justified beyond this critical section, i.e. beyond distance d from the face of support.
• Shear reinforcement as inclined stirrups per §11.5.6.3, and bent up bars per §11.5.6.4 and  §11.5.6.5.  Only vertical stirrups per §11.5.6.2 are used, since other types of shear reinforcement are not economically justified.