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Factors affecting the reduction rate of State does not reflect the sudden eccentric fork (see later), is not easy to detect sudden amount of beating. 

Second is the direct use of the bridge bearing hangers supports, as shown in Figure 2. This way closest to the actual operating conditions, Balancing works best. 

But it can be easily detected in the process of beating, but also monitoring of bridge bearing torsion pendulum and noise. Sometimes avoid bridge bearing disassembly and Assembly, and work effort.