【摘要】 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。更多还原

【Abstract】 The lateral and longitudinal regularities of concrete curved and skew girder bridges are discriminated using seismic design response spectrum theory by changing input direction of ground motion and introducing relative pier bottom shear ratio of lateral force resistance piers.The regularity of bidirectional regular seismic behavior of concrete curved girder bridge varying with central angle,curve radius,span,span-width ratio and span-height ratio is discussed,and such regularity of concrete skew girder bridge varying with skew angle,span,span-width ratio and bearing stiffness is also discussed.Thus,the bidirectional regular parameterized division criteria for concrete curved girder bridge and skew box-girder bridge are set up.By regression analysis,the seismic force approximate calculation methods for strict and approximate regularities concrete curved and skew box-girder bridges under E1 level earthquake action are put forward.The examples of calculation verification shows that the presented approximate calculation methods can attain higher accuracy.更多还原