Future calculation of the fire resistance of slender calcium silicate walls with explicitly higher loads

At present the fire resistance endurance of load bearing walls with a fire-separating func-tion has to be determined depending on the utilisation factor as given in the rules of the annex to the list of technical rules. The restriction of the utilisation factor to 1,0 means that no higher loads are allowed as calculated in the structural analysis according to the simplified calculation method in DIN 1053-1. Otherwise the thickness of the wall has to be increased to reduce the utilisation factor. To take advantage for slender calcium silicate masonry walls in applying the permitted clearly higher loads according to the more exact calculation method in DIN 1053-1 and especially according to the semi-probabilistic safety concept also in case of requirements on fire protection, the European calcium silicate industry realized a substantial research project as already described in details earlier. Now in this article the effect on future standardisation projects, especially on the currently revised standards DIN 4102-4 and -22, will be illustrated. Finally a proposal is given for future rules to determine the fire resistance period of load bearing calcium silicate walls with a fire-separating function.