Fire design of steel truss girders

Fire exposure

Truss girders are ideal for long-span structures in steel construction, especially if the construction height is not too limited. This can be the case, for example, in places of assembly or industrial halls. The moment is transferred particularly economically via a pair of forces (tension and pressure) and the steel tonnage is minimized.

Especially in places of assembly constructive fire protection plays an outstanding role for the safe escape of the building's users. Since unprotected steel cross-sections heat up quickly due to the high thermal conductivity of the steel, it is challenging to achieve a fire resistance time.

However, since truss girders are often farther away from the source of the fire in higher buildings, it makes sense here to use a temperature-time curve that deviates from the ISO standard fire. This results in more realistic, usually significantly lower fire room temperatures, so that it is often possible to design the lattice girders either without or only with partial constructive fire protection.

How I can help you.

I offer you a short-term fire design. The documentation contains the essential information on the heating of the cross-section, the fire resistance period of the member and its deformations. Other services can of course be provided in consultation with you. Depending on the task, the fire room temperatures are determined either via parametric temperature-time curves or zone models based on fire loads.

My initial consultation for your project

In order to clarify your specific task, it is best to give me a call. Or you can send me an e-mail with a few key data. On this basis we can discuss the general conditions and I can make you an attractive offer.