PURPOSE: To form a rigid frame structure having the small cross section of a column and a small footing by connecting one of an upper section and a lower section by a pin and connecting the other by a viscoelastic damper in the connection of the column and a beam.

CONSTITUTION: When horizontal force in a short term such as an earthquake, wind load, etc., is applied to the building 1 of a rigid frame structure, in which beams 6 are mounted on columns 2 through rubber asphalt viscoelastic dampers 12a, the first tabular bodies 13 and second tabular bodies 15 of the rubber asphalt viscoelastic dampers 12a intend to be moved mutually. Upper brackets 10 and top chord materials 7 are connected by pins by the viscoelasticity of rubber asphalt 17 filled among each mutual tabular body. On the other hand, the rubber asphalt viscoelastic dampers 12 interposed among lower brackets 11 and the end sections of lower chord materials 8 are not moved, the columns 2 and the beams 6 are brought to the state of a rigid joint, and turned to their advantage by pin-connection, and the cross sections of the columns and footings can be scaled down.