Tianjian Ji suggested the new human-body model for evaluating grandstand structure vibration. The paper shows that the incorrect understanding of the human whole-body model leaded the collapse of a temporary grandstand in Corsica in May 1992, and virtually the structure involving crowds has been changed the structure characteristics. The paper therefore says that the stiffness of the human body must be considered for the design of the grandstand structure. Even for the design of bridge structure, the human whole-body and the vehicle have been considered as a lumped mass neglecting that the effects of human-body and vehicle stiffness and damping for the dynamic analyses of the structures. The lack of study for the effects of human body stiffness on the bridge structure makes people doubt the safety of the bridge structure design. So this paper considers whether the human body stiffness and vehicle stiffness and damping can be neglected in view of safety of the bridge structures on the earthquake loading. This research deserves to study in respect of considering actually the stiffness of human-body and vehicle in the dynamic analyses of bridge structures.
In this paper, 2 foot bridges and the 1 bridge structure are used. And 2 model of human-body and vehicle are applied to the structure. One is the model involving the stiffness effects suggested by Tianjian Ji. The other is one suggested by design code. Then the responses of the structure in both cases to ground shaking are compared. Finally this paper ascertains whether the consideration of the human body as a mass is safe in the aseismic design. A Finite element program , ADINA is used for the dynamic analyses.