Plate type viscous damper, tuned mass damper and damper coefficient adjusting method

The invention discloses a plate type viscous damper, a tuned mass damper and a damper coefficient adjusting method, and relates to the technical field of building quakeproof. The damper comprises a lower cavity for containing damping liquid and an upper shear plate arranged in the cavity, wherein the lower cavity is vertically arranged and is of a lower sealing cavity structure with the bottom and the side parts sealed, the shape of an upper shearing plate matches with that of the lower cavity, the upper shearing plate is vertically inserted into the lower cavity from the upper portion, a gap is formed between the upper shearing plate and the inner wall of the lower cavity, the wall face of the upper shearing plate and the wall face of the lower cavity can vertically move relative to each other to shear damping fluid, the upper shearing plate and the lower cavity move in the opposite direction in the building vibration process through inertia, so that vibration energy is reduced, the quakeproof effect is achi