STEEL-CONCRETE COMPOSITE BRIDGES SUBJECTED TO FATIGUELOADING

摘要

In current national and international standards of composite structures of steel and concrete thedetermination of the ultimate load capacity and the fatigue life of headed shear studs takes placewith separate and independent verifications at the ultimate limit state, serviceability limit state andfatigue limit state. The effect of pre-damage due to fatigue loading is not considered. This paperdeals with the results of a comprehensive program of experimental work with more than 90standard EC4-push-out test specimens and two full scale-beam tests which consider the crackpropagation through the stud foot and the local damage of concrete surrounding the studs asrelevant consequences of high cycle loading. Based on the results of the push-out tests, new designmethods were developed to predict the fatigue life and the residual strength of headed shear studsafter high cycle loading. Considering the interaction between the local damage and the behaviour ofthe global structure, these research results were taken as the basis to simulate the cyclic behaviourof composite beams.