In this paper, the seismic vibration tests are carried out using small scale models of cylindrical lattice shell roofs supported by substructure with viscous damper under horizontal motions.
The cylindrical lattice shell roofs used in the experiments are made of steel plates 0.8mm thick. The arch span is 75 cm. The substructures consist of a linear motion slider, compression or tension springs and weights. The natural periods of substructures are adjusted by varying the spring constants and the weights. The shell roofs are subjected to earthquake motions with gable (arch) direction. The viscous damper is selected as the additive damping is 20%. The coefficient of viscosity of damper is 1100kg/s at velocity with 20cm/s. The shell roofs and substructures are in elastic range under earthquake motions.
From the experimental results, the response reduction effect by adding the viscous damper is examined. At first, the fundamental vibrational characteristics of shell roof and fundamental characteristics of viscous damper are examined. The effects of relationship between mechanical properties of roofs and substructures, existence of damper and shortening of time axis on response behavior of shell roofs are made clear. In addition, it is confirmed that the simple response evaluation methods proposed in previous papers apply to the responses with viscous damper.
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