以上海嘉闵高架桥为依托，分析了不同曲率半径、地震输入方向对立交匝道桥地震响应的影响，指出小曲率半径下的匝道桥地震响应较为复杂，地震最不利输入方向与墩柱切线、法线方向仍存在20º～30º的偏差，墩底弯矩偏低约10%～20%，大曲率半径下则可简化为直线桥。基于新规范体系，评估了立交匝道桥在两级地震作用下的性能，指出匝道桥较容易满足E1地震下的强度要求，在E2地震下，顺桥向固定墩以及横桥向高墩均会进入屈服，其中矮墩固定墩较容易发生剪切破坏。对直线匝道桥分别采用延性抗震体系与减、隔震体系进行设计，并评估其适用性，指出单独采用任何一种抗震体系都难以满足结构性能要求，建议高墩区采用延性抗震体系，矮墩区采用减隔震体系。
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.
关键词
匝道桥 /
曲率半径 /
地震动输入方向 /
抗震体系 /
延性 /
减隔震
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Key words
Ramp bridge /
curve radius /
earthquake input direction /
seismic resistant system /
ductility seismic resistance /
seismic mitigation and isolation technique
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