An Analysis of the Impact Exerted on Bearing Capacity of Pier and Pile after Increasing Pile Cap Height

Table 1

Natural vibration period and vibration mode of Shougang Bridge before and after cap rise cap.

Modal number	Raise 0 m		Raise 1 m		Raise 2 m		Raise 3 m
	Natural period	Mode shape description	Natural period	Mode shape description	Natural period	Mode shape description	Natural period	Mode shape description
1	2.184	Along-bridge	2.123	Along-bridge	2.05	Along-bridge	1.898	Along-bridge
2	0.809	Across-bridge	0.858	Across-bridge	0.855	Across-bridge	0.775	Across-bridge
3	0.161	Vertical torsion	0.168	Vertical torsion	0.175	Vertical torsion	0.178	Vertical torsion
4	0.147	Vertical torsion	0.15	Vertical torsion	0.151	Vertical torsion	0.143	Vertical torsion
5	0.075	Along-bridge	0.081	Along-bridge	0.088	Along-bridge	0.076	Along-bridge
6	0.072	Vertical torsion	0.071	Vertical torsion	0.07	Vertical torsion	0.065	Vertical torsion
7	0.035	Vertical torsion	0.035	Vertical torsion	0.035	Vertical torsion	0.034	Vertical torsion