Temperature changes can have a significant impact on the performance and behaviour of steel. When it comes to structural steel, this becomes even more important as the failure to account for temperature and its effects on the steel can lead to issues such as structural failure and deformation in the long term. In this post, we take a closer look at some of the effects that temperature has on steel and how these effects can cause the performance of the steel to change over time.
Effects of Temperature Changes on Steel
Like most other materials, steel expands when its temperature increases and contracts when its temperature decreases. As such, temperature fluctuations can cause constant movement within a steel structure. Over time, this can lead to a buildup of stress in critical areas of a steel structure, potentially causing issues such as weakened joints, compromised welds, and even cracking or deformation of the steel. In larger structures such as buildings and bridges, even minor temperature changes can lead to significant expansion or contraction. It is thus important to account for these temperature-induced changes and to cater for them accordingly.
Environmental Factors That Influence Thermal Behaviour
There are several primary environmental factors that have a significant influence on the thermal behaviour of steel. These include:
Ambient Temperature
Ambient temperature refers to the temperature of the environment surrounding the steel and has one of the most direct influences on the temperature of the steel. This effect is most pronounced in regions where there are significant temperature swings between day and night.
Solar Radiation
Solar radiation brought about by exposure to direct sunlight can also significantly increase the temperature of the steel. This is because steel absorbs heat rapidly, leading to uneven expansion across different sections of a structure. This problem might be worsened if some parts of a steel structure are exposed to the sun, whereas other parts are shaded. In such applications, additional calculations are therefore recommended to account for this difference.
Moisture and Humidity
While moisture does not directly affect the thermal expansion of steel, it can contribute to temperature variability by promoting rust or corrosion, affecting the properties of the steel. This is because corroded steel may behave unpredictably when subject to temperature fluctuations, as the surface may no longer expand or contract uniformly. In humid environments, moisture can also condense on cooler steel surfaces, altering their thermal response.
When In Doubt, Ask an Expert
If you are unsure about any aspect of working with steel, including accounting for temperature changes, it can be a good idea to get an expert opinion. RW Steel is the leading supplier of retaining wall steel in Melbourne, and our team of experts would be more than happy to assist you with any queries you may have relating to steel and its use. Contact us today to find out more about how we might be able to help with your steel needs!