钢管再生混凝土拱桥拱肋地震响应及抗震性能

Seismic Responses and Anti-seismic Performance of Recycled Concrete-filled Steel-tube Arch Ribs

用再生骨料混凝土作为钢管混凝土结构的填充材料,形成钢管再生混凝土结构,研究钢管再生混凝土拱桥拱肋的抗震性能,以某单跨中承式拱桥为例,建立计算模型,分析结构模型的动力特性,计算了拱肋结构不同截面的弯矩响应峰值和轴力响应峰值,同时研究得出了不同再生骨料替代率的钢管再生混凝土结构5个屈服阶段的抗震评估曲线。通过比较计算,所得出的内力响应峰值和抗震评估曲线的关系,得出了拱肋结构的抗震性能。计算结果表明,钢管再生混凝土应用于拱肋结构有着较好的抗震性能,不同替代率的再生骨料对钢管混凝土拱桥结构拱肋抗震性能影响程度较小。

Anti-seismic performance of the recycled concrete-filled steel-tube arch ribs is studied. The model for a single span and half-through arch bridge is established, and its dynamic characteristics are analyzed. The peaks of the bending moment response and axial force response in different sections of the arch ribs are calculated. Meanwhile, the seismic evaluation curves of the five yielding stages of the arch ribs with different regeneration aggregate replacement rates are obtained. Comparing the relations between the peak of the internal force response and the seismic evaluation curves, the anti-seismic performances of the arch ribs are obtained. Results of computation show that the recycled concrete applied to the steel-tube arch ribs has good anti-seismic performance, and the replacement rate of the recycled aggregate has little influence on the anti-seismic performance of the concrete-filled steel-tube arch ribs.