大跨度连续刚构桥抗震性能分析

Seismic Performance Analysis of A Long-span Continuous Rigid Frame bridge

双肢薄壁墩和单柱式墩是连续刚构桥的常用桥墩结构形式,为研究桥墩形式对桥梁的影响,以某连续刚构桥为基础,建立空间有限元模型,对比分析双肢薄壁墩和单柱式墩对连续刚构桥动力特性与地震相应的影响,研究预应力对桥梁地震响应和抗震性能验算的影响。结果表明,相同截面情况下,双肢薄壁墩比单柱式墩受力更为合理,预应力对刚构桥地震响应影响不大,但抗震性能验算时必须考虑预应力作用,且双肢墩的内外两肢受力要协调,避免正常使用状况下内外两肢内力相差过大。

Double thin-wall pier and single column pier were two common forms of continuous rigid frame bridges. In order to study the influence of the bridge pier forms, this paper established space finite element model of a continuous rigid frame bridge.It compared the dynamic characteristics and earthquake response between double thin-wall pier and single column pier, The influence of prestress on seismic response and seismic performance evaluation also been studied. The results showed that the performance of double thin-wall pier was more reasonable than that of single column pier, the influence of prestress on seismic response was too small, but it should be considered for seismic performance evaluation. And the force of internal and external limb should be reasonable to avoid large difference between the two limbs in serviceability state.