A Contribution in Regard to Behaviour of Reinforced Tee-Beams with Bonded Flatsteel Components under Fatigue Loads

Adopting the technique of glueing flatsteel components to existing rc-structures for the purpose of modifying the loadbearing capacities of structural systems in case of changing demands has become a common method. Regulations of such techniques for the FRG are covered under Certificate No Z-26.1–1 of IfBt, Berlin since october, 1979. The method has to date been limited to predominantly static loads according to DIN 1055 P.3, thus excluding special cases of impact loads, frequent repetition of loads or action of unbalanced machinery or other dynamic live loads. It is obvious that a reasonable number of structures are exposed to dynamic load conditions. Adopting the glueing technique as an economic method of preserving existing structures is a future demand.The forementioned certificate will be reissued in the near future to allow for dynamic loads. The revisions are based on the encouraging results of fatigue tests with subsequent ultimate static bending of tee-beams in the EMPA-laboratories for material testing and research of Switzerland. Some eminent testing results will be described to prove the efficiency of the method.