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Full Awning Design

Before and After

Façade of a Building


The Problem

Design a mounting solution for an awning covering a window in a home.


Understand the problem


What is an awning ?

An awning or overhang is a covering attached to the exterior wall of a building to provide shelter from the elements like Rain , sunshine.


Analyse to understand the problem in the best way possible

Understand the design of a generic awning there are certain elements to the design


Extract the Input


How to extract Input ?

  • Reverse engineering
  • Images


Reverse engineering – Measurements

Taking physical measurements of the problem space


Form of Input Data

Measurements should be converted into a CAD model

  • Well defined model is not required
  • Extracting data which is most important



  • Functional
  • Structural
  • Assembly
  • Maintenance
  • Environmental
  • Aesthetic
  • Safety
  • Reliability
  • Ergonomics


Structural requirements

  • To sustain the loads on awning from wind and self-weight and impact loads due to debris falling on awning.
  • To maintain stability of structure.


Environmental requirements

  • To withstand environmental conditions of rain, heat and cold without deterioration in material property.


Assembly requirements

An assembly mechanism

  • to mount the frame of awning to the wall
  • Be able to dismantle the assembly if required


Aesthetic requirements

To maintain the look of the façade of the building and not look out of place..


Concept development

Now that the requirements are understood.

Next step is to generate concepts.


How to Generate Concepts ?

  • Learning From Research and Gather Ideas
  • Brainstorm and Ideate
  • Synthesis of Ideas into concepts
  • Should meet requirements


Awning – Concept


Concept of mounting 1

Awning is connected to the Wall by a Link with pin joints at either end

Link is Aluminium channel


Concept of mounting 2

Awning is connected to the Wall rigidly through the Red frame on either side of Awning

Bracket is Wooden


Comparison of Concepts

Concept 1Concept 2
 Uses a link to connect the Awning to the wall Uses a structural bracket which connects the awning to the wall
 Uses Pin joints – temporary Uses Permanent joints
 Easier to dismantle Cannot be dismantled
 Lighter Heavier
 Additional brackets for mounting pins No additional brackets for pin mountings
 Inferior in Aesthetics Superior in Aesthetics
 Can take lesser loads Can take larger loads
 Cheaper Costlier


Concept Selection

  • Concept 1 is inferior to concept 2 in aesthetics but superior in assembly requirements.
  • Concept 2 is stronger but that extra strength may not be required for the conditions.
  • Concept 1 is cheaper and light weight.


Selecting a concept and the reasoning behind it ?

  • Ease of installation
  • Simple and light
  • Cheaper

Although in this case Concept 1 has been considered superior but this might not be the case in all other instances of design


Engineering Analysis

Analysis of the Design with respect to Engineering principles

1. Engineering mechanics

2. Strength of materials

3. Machine design

Converting the design problem to an Engineering problem


Formulating the engineering problem



  • Get the reaction forces
  • Use reaction forces to calculate stress in the member


Arriving at the Design load

  • Wind loads
  • Self weight


Wind Load direction

Wind velocity



Wind pressure calculations

150 km / h =42 m / s

Generic formula for wind pressure , P = 0.613 V^2

Source : Wikihow

Considering the area of application faces a year round probability of storms then the maximum velocity of wind

For a sever storm is maximum 150 km/h

Calculated Pressure (N/m^2) –

= 0.613 * 42^2

= 1081 N/m^2


Calculate the Load from pressure

Projected area of the Awning is 1 metre X 0.7 metre = 0.7 m^2

Load acting = Pressure X Area

Load = 1081 * 0.7 = 756.7 N or 76 kg


Self Weight calculation

Self weight , Sheet = 11 kg

Frame = 10 kg

Total Design load = Wind load + Self weight load

= 76 +11+10 = 100 kg

Assumed : Although the Weight will act vertically downwards, the Load due to self weight is a fraction of the wind load.


Considering Overload factor as 1.5

Cause of Overloads?

  • Debris falling onto the awning
  • Extreme gale force winds
  • Material variations
  • Dimensional variations

Load to be considered = 150 kg = 1500 N


Static Force and Moment analysis


  • Find the Force and Moment equilibrium equations
  • Solve to Find the Unknowns using Simultaneous equations method.


Free body diagram for system

Load acting is 1500/ 2 (at one side) at centre of the link.


Free body diagram

Kinematically it is a structure – Triangle




Free body diagram – Using Method of sections


Resolving the load into vertical and horizontal components


Using Triangle Law


Θ = 12.7 degree



sinθ = H/750
H = (sin 12.7)*750
H = (0.219)*750

cosθ = V/750
V = (cos 12.7)*750
V = (0.9755)*750
V=731.7 N


Resolving the Fce force into vertical and horizontal components

sinθ = H/Fce
H = (sin 59)*Fce
H = (0.857)*Fce

cosθ = V/Fce
V = (cos 59)*Fce
V = (0.515)*Fce


Free Body Diagram

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