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为给我国桥梁抗震设计规范的修订提供参考资料,从抗震设计反应谱理论角度,通过改变地震动的输入方向,引入抗侧力桥墩的“相对墩底剪力比”参数来判别混凝土曲线梁桥的双向规则性,探讨了圆心角、曲线半径、跨径、跨宽比和跨高比等结构参数变化对混凝土曲线梁桥横桥向和纵桥向规则性地震行为的影响规律。研究表明:圆心角是影响混凝土曲线梁桥双向规则性的主要因素,而跨径、跨宽比和跨高比等参数的影响可以忽略,曲线半径不应作为定义规则曲线梁桥的参数;曲线梁桥当满足单跨圆心角φ小于35°,且多跨一联累计圆心角ψ小于55°时具有双向规则性,规则曲线梁桥的地震力可比拟为等参的直线桥进行简化抗震计算,计算结果偏于保守。
In order to provide references for the revision of our country’s code for seismic design of bridges, from the point of view of seismic design response theory, we can determine the concrete curve by changing the input direction of seismic motion and introducing the relative pier shear ratio of anti-lateral piers The influence of structural parameters such as central angle, radius of curvature, span, span-to-span ratio and span-height ratio on the regular seismic behavior of concrete curved beam-bridge is discussed. The results show that the central angle is the main factor influencing the two-way regularity of concrete curved beam bridge, and the influence of span, span-to-span ratio and span-height ratio is negligible. The curve radius should not be taken as the parameter to define the regular curved beam bridge. The girder bridge has two-way regularity when the single-spider central angle φ is less than 35 °, and the multi-span cumulative central angle ψ is less than 55 °. The seismic force of the regular curved girder bridge can be compared with that of equivalent straight-line bridge for simplified seismic calculation , The result is conservative.