Structural Integrity

This process checks a structure’s ability to withstand its intended load without failing. Those deformation problems can come from deformation, fracture, fatigue, or collapse in any part of the building. This test ensures that any building can remain stable, safe, and usable throughout its intended life.

The reason why you need to be aware of structural integrity is that deterioration can happen anytime and anywhere. For example, the Department for Education (DfE) of the UK reported that around 572 schools are on the verge of structural collapse. Most of them are unaware of the danger of crumbling concrete. 

How do you assess structural integrity?

Conducting these tasks can include a combination of visual inspections, non-destructive testing (NDT), load testing, and structural health monitoring. However, there are a few key aspects you have to pay attention to when observing it. For example, the load-bearing strength test. A building must support the forces acting on it, including dead loads, live loads, and environmental loads. It needs to be able to handle those situations without bending too much or breaking.

There are a few signs that a failure in structural integrity has occurred. For instance, there can be cracks in walls or beams, sagging floors or roofs, bulging or leaning walls, and many more. Without a proper inspection, it can lead to the complete collapse of the building. This is a dangerous situation that can often be fatal. That is why testing is so important. Now, we are going to explain a bit further on how to do these tests safely.

Non-destructive testing 

This checks that the structural integrity test does not damage the materials or structures. Instead, it uses technologies to find cracks, voids, and other signs. Due to its convenience, NDT is widely used in routine inspections. Moreover, there are many methods of non-destructive testing you can use, such as these:

• Ultrasonic testing (UT) – It uses high-frequency sound waves through a material. Then, the waves get reflected and show internal flaws like cracks or voids. 
• Magnetic particle testing – The way this checks structural integrity is by applying a magnetic field to a metal part. Then, you sprinkle iron particles over the surface. If there are any cracks or defects, they are going to cluster.
• Radiographic testing (RT) – X-rays or gamma rays will create images of the internal structure of a material.
• Dye penetrant testing – To check the structural integrity, the surface is evaluated with a brightly coloured or fluorescent dye, then wiped. From this, you can see the drawing of cracks from the dye.
• Infrared thermography – Infrared cameras to detect heat differences.

Load testing

This structural integrity test is to check how a structure behaves under actual loads. It is for simulating real-world use or stress. If there are any permanent deformations after the test, it is a bad sign. A good structural performance requires the structure to return to its original state. There are two types of tests for this, which are static load and dynamic load. 

Static is a test that is used to measure deflection, stress, and more by putting the structure under a controlled load. Meanwhile, dynamic testing is a test that requires moving loads, which also recreates trucks crossing bridges or wind sway for tall structures. Both of these tests determine whether the structure can withstand the stresses to which it will be subjected.

Material testing

This type of test for structural integrity is to verify the physical and mechanical properties of building materials. This means that it checks every component to see if they are suitable for building or not. Each of them has their own methods to see the result. For example, a concrete compression test, a tensile test for steel and a rebar corrosion test. Those tests are all to check individual material, ensuring that the material chosen is the right one for the job. 

Vibration and modal testing

This method of checking structural integrity is used to assess the dynamic response. The result will show how a building will react to vibrations, wind, or seismic activities. What makes this important is that it provides insights for ensuring the safety, performance, and durability of the structure under a certain condition. For example, earthquakes, strong winds, machinery operations, and many others. 

Visual inspection

This is the most basic but key method to check structural integrity. It is often the first thing people do in an inspection. They are looking for cracks, corrosion, stains, sagging, and alignment issues in the building. After they find the potential issue, they can cross-check it with other types of tests.