两跨连续箱梁桥模态实桥试验分析

摘要

对某两跨预应力混凝土连续箱梁桥进行现场振动试验,通过对实测数据分析处理得到该桥固有频率、阻尼比及模态振型,并将试验模态分析结果与有限元分析进行对比.结果表明,实测振型与分析振型符合较好,实测频率略大于分析频率,说明该桥的刚度略高于设计值.%Based on the on-site vibration test for a two-span continuous PC box girder bridge, this paper analyzes the natural frequency, damping ratio and modal shape of the bridge. And the experimental modal analysis results are compared with the FEM results. The comparison results show that the measured vibration model shape and analysis of vibration model are in good conformity, and the measured frequency results of the bridge are greater than the FEM results, indicating the stiffness of the bridge is slightly higher than the design value.