Reduction of Vibrations in Long-Span Continuous Girder Bridges with Pounding Tuned Mass Dampers

Table 5

Comparison of PTMD vibration reduction effects under different collision gaps.

Span (m)	Collision gap (cm)	Displacement peak (mm)	The vibration reduction rate (%)	Speed peak	The vibration reduction rate (%)
80	No control	93	—	0.85	—
	6	80	14.0	0.61	28.2
	8	79	15.1	0.61	28.2
	10	79	15.1	0.6	29.4
	12	82	11.8	0.63	25.9
120 (midspan)	No control	202	—	1.51	—
	6	117	42.1	1.02	32.5
	8	112	44.6	0.96	36.4
	10	110	45.5	1.0	33.8
	12	119	41.1	1.02	32.5
120 (side span)	No control	151	—	1.19	—
	6	114	24.5	0.83	30.3
	8	108	28.5	0.74	37.8
	10	115	23.8	0.77	35.3
	12	120	20.5	0.9	24.4