Abstract
Among various limit states, serviceability limit state has not been fully investigated, because serviceability is not a fatal phenomenon in comparison with a collapse or a damage of structures. This study applies to a vibration as a serviceability limit state. Dynamic response of highway bridge under a moving vehicle is analyzed by simulation method and means of nonstationary random vibration theory, taking account of roadway roughness and coupling vibration of bending and torsion. Root mean square (RMS) values of a velocity of girder are calculated and considered as a vibration stimulus for pedestrians, and limit state probabilitv of human vibration sensibilitv is calculated. And also maintenance criteria of road roughness are examined.
