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This paper discusses the path dependency of high cy cle fatigue behaviours of RC bridge slabs under var ious loading histories in use of laboratory experiments and numerical behavioural simulation. A prototype standard RC slab and another two specim ens, which were initially loaded statically in adva nce, were prepared for the subsequent wheel-type loading . All three of them were tested under a moving load f 160kN. Observed is the independency of the progress iv mid-span deflection on the loading histories. Furthermore, the same trend is rather observed at a level of 220kN as well with another set of specime ns of exactly the same shape and dimension. The observed phenomenon in the experiments was succ e sfully simulated by direct path-integral 3D nonlinear FE analysis considering the varying bound ary conditions from the preliminary loading state t o the main one to introduce the high cycle fatigue damage s.

FATIGUE-BASED STRUCTURAL BEHAVIOR OF RC BRIDGE SLABS WITH DIFFERENT LOADING HISTORIES