What is the damping ratio? What is the damping ratio of steel structure?

For bridge structures that can bear loads directly, it is generally not expected to work in the elastic-plastic stage, but the problems that will occur during the earthquake should be considered in the construction, so it is particularly important for steel structures in the elastic-plastic stage of earthquake resistance. Today, let's talk about the damping ratio of steel structures.

1. What is the damping ratio?

Want to know what is the damping ratio of steel structure? We must first know what the damping ratio is. Damping is a function of various frictional forces and some other obstacles that attenuate free vibration. This effect belongs to the category of structural dynamics in machinery, civil engineering, aerospace and other fields, that is, the ratio of damping coefficient to critical damping coefficient, which expresses a kind of damping size of structural standardization. Damping ratio is a dimensionless dimension, indicating that the vibration of the structure is weakening after being stimulated by oscillation, which is divided into 1, equal to 0 and equal to 1. If the damping ratio is equal to 0, the damping system is not considered, and the common damping ratio of the mechanism is between 0 and 1.

Second, what is the damping ratio of steel structure?

The damping ratio of reinforced concrete structures is generally between 0.03 and 0.08. What damping ratio should be chosen for seismic calculation of steel structures? In the calculation under frequent earthquakes, the damping ratio can be 0.04 when the height is not more than 50m, 0.03 when the height is more than 50m and less than 200m, and 0.02 when the height is not less than 200m. When the overturning moment of the eccentrically braced frame is greater than 50% of the total overturning moment of the structure, the damping ratio can be increased by 0.005 compared with the original damping ratio, and in the case of rare earthquakes.

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