FAQ 002383 EN-US 10/25/2018

Bastian Kuhn General RFEM

How do I define temperature loads on a composite beam?

Answer

The load case temperature is very important in composite construction. A distinction is made here between the load cases heating up (by concreting) and heating below. Since a temperature change has to be defined here, the load is defined as Delta T. Often a composite beam is modeled over an eccentric rod coupled to a surface. For this, the difference in temperature between these two elements (surface and rod) must be divided. The load on the bar is defined as the bar load with the temperature difference times the height of the bar divided by the total height of the composite cross section ($ \ triangle T \ times \ frac {h_s} {h_g} $). If the upper fibers of the rod are colder than the lower ones, the value must be defined negatively.
Finally, the remaining temperature difference is applied to the surface. Care must be taken here to define the temperature of the rod as T c on the surface and to apply the still missing temperature as delta T to the surface.

Keywords

Composite carrier temperature temperature difference

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