大跨度单塔自锚式悬索桥的抗震设计

Anti-seismic Design of Large-span Self-anchored Suspension Bridges with a Single Tower

大跨度单塔自锚式悬索桥是一种新型桥梁,这种桥梁在动力学特性方面与相同跨度的传统的自锚式悬索桥存在较大差异,抗震设计的难度也较大。以平胜大桥为例,简述了大跨度单塔自锚式悬索桥的抗震设计方法,计算分析表明,大跨度自锚式悬索桥适合采用飘浮体系,摆式滑动支座的力学性能可以满足同类桥梁抗震设计的需要。

The large-span self-anchored suspension bridge with a single tower is a new structural style of bridges. Considering the dynamical performance of the bridge, this type of bridges is very different from conventional self-anchored suspension bridges with the same span. Compared with common self-anchored suspension bridges, this type of bridges is more difficult in anti-seismic design. With the Pingsheng Bridge as a practical example, the anti-seismic design method of self-anchored suspension bridges with a single tower is dealt with in the paper. According to the results of our analyses and calculations, a floating system is suitable for large-span self-anchored suspension bridges with a single tower. In addition, it is proved that the mechanical performance of the friction pendulum system can meet the requirements of the anti- seismic design of bridges of the same type.