中文摘要：

设计制作3跨单箱单室变截面波纹钢腹板连续刚构桥和等效的普通混凝土腹板连续刚构桥模型，通过试验测试和采用有限元法研究波纹钢腹板连续刚构桥的自振频率及结构刚度。实测和有限元计算的结果表明，波纹钢腹板连续刚构桥各向1阶自振频率均比混凝土腹板连续刚构桥低，其中竖桥向1阶自振频率相差较小，而顺桥向及横桥向1阶自振频率相差明显，这说明波纹钢腹板连续刚构桥的各向整体刚度均小于混凝土腹板连续刚构桥，且其顺桥向及横桥向整体刚度与混凝土腹板刚构桥相比降低程度显著；波纹钢腹板刚构桥横桥向整体抗推刚度的降低速率是主梁横向刚度降低速率的1．361倍，而顺桥向整体抗推刚度的降低速率是主梁竖向刚度降低速率的4．123倍，说明顺桥向整体抗推刚度对主梁刚度的变化更敏感。

英文摘要：

Two comparison models of 3-span single cell box variable cross-section continuous rigid frame bridge with corrugated steel webs and the equivalent ordinary concrete continuous rigid frame bridge were designed and constructed. The natural vibration frequency and structural stiffness of continuous rigid frame bridge with corrugated steel webs were studied by experimental testing and finite element method. The measured and FEM calculated results show that the first-order natural vibration frequencies in all di- rections of the continuous rigid frame bridge with corrugated steel webs are lower than the ones of concrete continuous rigid frame bridge. Among them, the difference of the first-order natural vibration frequency in vertical direction between the two models is smaller, while the differences of the first-order natural vibra- tion frequency in longitudinal and transverse are significant, which indicates that the overall stiffness in all directions of the continuous rigid frame bridge with corrugated steel webs is less than the one of concrete continuous rigid frame bridge. Compared with rigid frame bridge with ordinary concrete webs, its overall stiffness in longitudinal and transverse directions is declined significantly. The decreasing rate of its overall transverse anti-push stiffness is 1. 361 times as that of the lateral stiffness of the main girder, while the de- creasing rate of its overall longitudinal anti-push stiffness is 4. 123 times as that of the vertical stiffness of the main girder. It indicates that its overall longitudinal anti-push stiffness is more sensitive to the changes of the main girder＇s stiffness.