Seismic Response Analysis and Reasonable Seismic Resisting System Design for Interchange Ramp Bridge

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (13) : 189-194.

Juhui Zhang1 Zhongguo Guan2

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Abstract

The mainline interchange ramp bridge on the Jiamin Elevated Route in Shanghai was taken as the research object, and the effects of curve radii and earthquake input directions on seismic response of ramp bridges were discussed. The results show that, the seismic response of ramp bridges with smaller curve radius (R=50m) is very complicated. A deviation of 20o to 30o in angle and a lower value of bending moment by nearly 10% to 20% are existed at the pier bottom along the tangential or normal direction of pier columns compared with that of along the worst earthquake input direction. While the seismic response of ramp bridges, whose curve radius is larger than twenty times of bridge width, is nearly consistent with that of the straight bridge. A simplified straight bridge model can be used in the modeling of larger curve radius ramp bridges. Base on the new two-level seismic fortification criterion, the seismic performance of the ramp bridge was evaluated. It shows that it is easier to meet the strength requirements under E1 earthquake; while under E2 earthquake, both the fixed piers under the longitudinal earthquake input and the higher piers under the transverse earthquake input will be yield, especially shear failure is easily occurred in the lower fixed pier. Then the ductility seismic resistant system and the seismic mitigation and isolation system were respectively selected and applied for seismic design of the straight ramp bridge. The applicability of these two seismic systems is evaluated and the results show that only using one kind of seismic systems cannot meet the structural performance. It is suggested that the ductility seismic resistant system is applicable to area of the ramp bridge with tall piers, and the seismic mitigation and isolation system is more applicable to the area of the ramp bridge with short piers.

Key words

Ramp bridge / curve radius / earthquake input direction / seismic resistant system / ductility seismic resistance / seismic mitigation and isolation technique

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Juhui Zhang1 Zhongguo Guan2. Seismic Response Analysis and Reasonable Seismic Resisting System Design for Interchange Ramp Bridge[J]. Journal of Vibration and Shock, 2015, 34(13): 189-194

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