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FAQ 002383 EN-US

10/25/2018

# How do I define temperature loads on a composite beam?

#### Answer

The load case temperature is very important in composite construction. We distinguish between the following load cases: heating at the top (by concreting) and heating below. Since a temperature change has to be defined here, the load is defined as delta T. Frequently, a composite beam is modeled by means of an eccentric member that is coupled to a surface. For this, you have to divide the temperature difference between both elements (surface and member). The load on the member is defined as a member load with the temperature difference times the member height divided by the total height of the composite cross-section ($\ triangle T \ times \ frac {h_s} {h_g}$). If the upper fibers of the member are colder than the bottom ones, the value must be defined as negative.
Finally, the remaining temperature difference is applied to the surface. Care must be taken here to define the temperature of the member as T c on the surface and apply the still missing temperature as delta T to the surface.

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