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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弯斜梁桥的横桥向和纵桥向规则性,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双向规则性地震行为的影响规律,以及斜交角、跨径、跨宽比和支承刚度等主要结构参数变化对混凝土斜交箱梁桥双向规则性地震行为的影响规律,由此建立了混凝土曲线梁桥和斜交箱梁桥双向规则性参数化的划分标准。并通过回归分析,提出了E1水平地震作用下适用于严格规则和近似规则混凝土弯斜梁桥地震力的近似计算方法。算例验证表明,抗震近似计算方法结果具有较高的精度。
From the view of seismic design response spectrum theory, by changing the input direction of ground motion and introducing the relative pier-shear ratio parameters of anti-lateral piers, the transverse and longitudinal bridge regularity of concrete curved bridge is discriminated. Angle, curve radius, span, span ratio and span-height ratio on the two-way regular seismic behavior of concrete curved beam bridge, and the main structural parameters such as skew angle, span, span ratio and bearing stiffness The influence of the variation on the two-way regular seismic behavior of the concrete skew box girder bridge was established, and the bidirectional regular parametrized division criterion of the concrete curved beam bridge and the skewed box girder bridge was established. Through regression analysis, the approximate calculation method for the seismic force of concrete curved girder bridge with strict rules and approximate rules under E1 horizontal earthquake is proposed. The example verification shows that the approximate result of seismic calculation has high accuracy.