【摘要】 覆土波纹钢拱桥因其具有变形能力强、对地基要求低和抗震性能好等优点而被广泛推广，本文通过试验和数值模拟分别研究了单层钢板和波纹钢板-混凝土组合拱桥在回填过程和成桥阶段的自振特性。结果表明：随着填土高度的增加，单层钢板和波纹钢板-混凝土组合拱桥的自振频率均表现出先减小后增大最后再减小的规律；在整个回填施工过程中，覆土波纹钢板-混凝土组合拱桥的自振频率始终大于单层波纹钢拱桥，说明外侧的混凝土能有效提高结构的刚度；在进行数值模拟时，相比于实体单元，土弹簧单元可以准确地模拟波纹钢板外侧土体的约束作用，建议采取这种建模方法进行动力分析。更多还原

【Abstract】 Buried corrugated steel arch bridge is widely promoted because of its advantages of strong deformation capacity, low requirements for foundation and good seismic performance, etc. In this paper, the natural vibration characteristics of single-layer steel plate and corrugated steel plate-concrete composite arch bridges are investigated by experiments and numerical simulations in the backfilling process and bridge formation stage, respectively. The results show that with the increase of backfilling height, the natural vibration frequency of both single-layer steel plate and corrugated steel plate-concrete combination show the law of decreasing firstly, then increasing and finally decreasing; in the whole backfilling process, the natural vibration frequency of the corrugated steel plate-concrete combination arch bridge is always larger than that of the single-layer corrugated steel arch bridge, which indicates that the outer side concrete can improve the stiffness of the structure effectively. When conducting numerical simulations, the soil spring element can accurately simulate the constraint effect of the soil outside the corrugated steel plate compared to the solid element, and it is recommended to adopt this modelling method for dynamic analysis.更多还原