中文摘要：

研究目的：为研究变截面波形钢腹板PC连续箱梁桥的动力特性的特点,选择已建的变截面波形钢腹板PC箱梁桥——鄄城黄河公路大桥的两跨,按1∶10的比例缩尺制作（3＋3）m变截面波形钢腹板PC室内模型试验梁,采用模型试验及ANSYS有限元仿真分析的方法对模型试验梁的动力特性进行研究。研究结论：通过研究得出如下结论：（1）横隔板数量的改变对变截面波形钢腹板PC连续箱梁桥扭转振动频率的影响较大,对其弯曲振动频率的影响较小;（2）采用《公路桥涵设计通用规范》（JTG D60—2015）中连续梁基频的估算公式对室内试验梁的竖向基频进行了计算,并与实测值及有限元值对比后发现现行规范中连续梁竖向基频的估算公式不适用于该类型桥梁竖向基频的计算;（3）在现行规范估算公式中考虑波形钢腹板剪切变形的影响后,得到了适用于变截面波形钢腹板PC连续箱梁桥竖向基频计算的修正估算公式;（4）该研究成果可为公路桥梁工程中变截面波形钢腹板PC连续箱梁桥动力特性的分析提供参考。

英文摘要：

Research purposes： In order to study the dynamic characteristics of the PC box girder bridge with corrugated steel webs （CSWs） with variable cross - section, the bridge model with the span （ 3 ＋ 3 ） m used in the experiment testing is a one - to - ten scale model developed for the Juancheng Yellow River Bridge. The model test and ANSYS finite element simulation are used to study the dynamic characteristics of the PC continuous box girder bridge with CSWs with variable cross -section.Research conclusions ：The results show： （1） The number of diaphragm has great influences on the torsional vibration frequencies of this type bridge, while has little influences on the vertical bending vibration frequencies. （2） The fundamental frequency formulas from the JTG D60 -2015 code for the continuous girder are used to calculate the PC box girder bridge with CSWs with variable cross - section. The measured values and FEA values have big differences with the JTG D60 -2015 code values, so vertical fundamental frequency formulas of the continuous girder in current code are not suitable for this kind of bridge. （3） Considering the shear deformation of the CSWs, the correction formulas are obtained for the PC box girder bridge with CSWs with variable cross - section. （4） The research conclusions can provide references for the analysis of dynamic characteristics of variable cross - section PC continuous box girder bridges with CSWs in highway bridge engineering.