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新光大桥位于广州新光快速路主干线,是世界上第一座三跨连续钢桁拱与钢筋混凝土V型刚构结合的钢-混凝土组合体系桥梁,主桥跨度为177+428+177 m,在目前同类型桥梁中,主桥长度位居世界第一.该桥结构新颖,造型独特.文章主要针对新光大桥的动力特性和地震行波效应进行了详细研究.在两水准、两阶段抗震设防思想下给出了主要控制构件在考虑行波效应情况下的内力,并与纵桥向地震一致激励作用下的内力进行了比较;同时给出了在不同剪切波速下,主拱顶截面的位移时程曲线.研究表明行波效应以及地面剪切波速度对大跨度连续刚架钢桁拱桥的地震响应有着较大的影响.
Located on the main road of Xinguang Expressway in Guangzhou, Xinguang Bridge is the first composite steel-concrete composite bridge with three-span continuous steel truss arch and reinforced concrete V-type rigid frame. The span of the main bridge is 177 + 428 + 177 m. At present, the main bridge of the same type is the largest in length in the world in terms of length, and the bridge is novel in structure and unique in shape.This paper mainly studies the dynamic characteristics and seismic traveling wave effect of the Xinguang Bridge in detail.With the two-level and two-stage seismic fortification ideas The internal forces of the main control members under the traveling wave effect are given and compared with the internal forces under the consistent excitation of the longitudinal bridge. At the same time, the displacement of the main dome section under different shear wave velocities is given. Time-history curve.The research shows that the traveling wave effect and the shear wave velocity on the ground have a great influence on the seismic response of the long-span continuous steel truss arch bridge.