小半径曲线梁桥地震响应分析

Seismic response analysis of small-radius curved girder bridge

以某高速公路立交匝道桥梁为例,建立曲线梁桥的空间梁单元有限元模型,研究地震动输入、结构动力特性、地震动输入方向及组合方法,分析结果表明,曲线梁桥结构复杂,相对直线桥,其振型参与质量分布离散,桥墩内力对地震输入方向比较敏感,宜采用多个方向进行地震动输入,并对结果进行组合。

Take the bridge of one freeway interchange ramp as an example, built a space beam finite element model of the curved girder bridge. Research on the seismic input, structural dynamic characteristics, seismic input direction and the combination method. Contrast with the straight bridge, the analysis result shows that the curved bridge structure is complex and vibration mode is disperse in quality distribution. The pier internal force is susceptive to seismic input direction. It is suitable to input multiple direction seismic input and combine the analysis result.