May 11

What is Structural Engineering and What do Structural Engineers Do?


Structural engineering is a branch of civil engineering that involves the application of the laws of physics, mathematics and empirical knowledge to safely design the ‘bones’ and load bearing elements of man made structures. Modern day structural engineering provides a large and detailed body of knowledge that can accurately predict the performance of different shapes and materials used in structures to resist loads and stresses on structures. The principles of structural engineering were used thousands of years ago when building structures like the pyramids in Egypt or the Acropolis in Greece.


Structural engineers are trained professionals who are responsible for making sure that the structures we use in our daily lives, like bridges and tall buildings, are safe, stable and don’t collapse under applied loads. They do this by applying their technical knowledge to specify different types of construction materials in various shapes and geometries and design structures that can withstand the pressures and stresses of their environment such as gravity loads, storms and earthquakes.

picture of a busy building

As a structural engineer, I work closely with my clients to understand the function of the project in order to provide a safe, constructable and economical solution to complete their project successfully. Generally speaking, the structural design process of a building can be divided into three stages: load calculation, structural analysis and design.

Depending on the function of the building, standards and building codes can be used to estimate the weight of the building, and snow, wind and earthquake loads on the structures. Once the loads acting on the structure are known, the structure is analyzed to determine the effect of all these loads on the individual elements of the structure. Engineering software can be used by structural engineers to analyze different kinds of structures. It is always a good idea to check the validity of the software results using first principal knowledge and basic structural analysis formulas. The forces and stresses from the structural analysis software can be used to design the main structural elements including the floor system, vertical supports, foundations and other parts of the building.

As a structural engineer, the safety of the public is my top priority. When it comes to buildings and infrastructure we use in our society, the consequences of a collapsed structure can be catastrophic. This is the why structural engineers use factors of safety in their design to account for uncertainty in load assumptions and unexpected deficiency in construction material or workmanship.    


Structural engineers are brought on to a project if an owner is planning on changing the use of a building, introducing more floors to a building, or adding a significant expansion to a building.  It’s very important to understand that introducing alterations to any structural element without consulting a professional engineer may result in serious damage to the structure and in some cases partial or extensive collapse of the building.

Structural engineers are also brought on board if there is damage to a structure due to fire, corrosion, environmental deterioration, impact or wear and tear that could result in a loss of capacity and impose a threat to the public’s safety. When a structural engineer is contacted for an assessment of an existing building, they would visually inspect the structure and determine the structural integrity of the load bearing elements, potential concerns regarding the occupants safety, suggest repair techniques and recommend structural details to restore the structure to its original conditions in order to resist the applied loads.


I get this question often and the answer is no. Both architects and engineers have important but different roles in the design of a building. I like to explain this by thinking of a residential building for an example. If the aesthetics of the building looks pleasing and the spaces inside feel comfortable and inviting, this means that the architect did a good job designing the building. The work of the structural engineer however, is evident in the stability of the structure under different loading conditions. No matter how windy it is outside or how much snow there is on the roof, the building remains in tact, safe and comfortable to its occupants.

structural engineer 2architect or engineer

Hopefully you now have a good understanding as to what structural engineering is, what structural engineers do, and the importance of structural engineering in a society where there are structures all around us that we are constant using in our day to day lives. Structural engineers, as do other engineers, have a huge responsibility to ensure that the public is safe and cared for, and that their best interests are considered. If you have any questions with regards to structural engineering, feel free to leave a comment below!

If you’d like to learn more about the basics of structural engineering, please download our FREE Ultimate Guide to Structural Engineering Basics or sign up for our detailed online structural engineering course here.

Mostafa El-Mogy



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  1. Mostafa El-Mogy has put in utmost effort to specify what exactly structural engineering is, and diverse other aspects associated with it. This write-up is exceptionally detailed, and would clear all your doubts (of course if you have any). A special section also points out whether architects and engineers are the same or not. Please give this a read right now.

  2. It is great to learn so much from this article, especially how structural engineers take care of fire damage issues if it becomes public safety. One of my college classes started talking about different types of enginers, and I have been really interested in doing some extra research. In my opinion, anyone in need of a structural engineer should make sure to review their credentials when hiring them.

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  4. Thank you for helping me to understand that structural engineers help apply mathematics and physics to the important parts of structures. It seems that they are really important in helping large buildings last longer. It would be interesting to learn more about how much schooling these engineers have to go through.

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  7. Great Post!
    This very useful information for us. Structural engineering services always help to make our CAD Drawing’s perfect . I like to read your Blog. Thank you so much for post this informative blog with us. Keep posting!

  8. I appreciate you helping me to understand that structural engineers work with construction companies to ensure that buildings don’t collapse when they are built. If I were to guess, structural engineers probably consult on other civil projects such as roadways. It would be cool to learn more about how the process of designing a roadway works.

  9. Thanks for helping me learn more about structural engineering. I’ve been seeing a lot of ads regarding structural engineering consultants lately and I got curious. I had no idea that they also handle fire, corrosion and other damages in a building. Since one of my uncle’s old properties got damaged by a neighbor’s fire, I should suggest this to him.

  10. I real appreciate you for this great light, you have done a great job. May God increase you thanks

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