论文部分内容阅读
以天津海河部分填充混凝土钢桁梁桥为研究对象,利用大型有限元软件ANSYS建立了该桥的三维空间有限元模型,对其进行动力特性分析;在此基础上,按照两种地震荷载工况,采用动力时程分析法开展了部分填充混凝土钢桁梁桥的地震响应分析。结果表明,部分填充混凝土后钢桁梁桥的竖向抗弯、抗扭刚度得到提高,其对应的振动频率随之增大;在地震荷载作用下部分填充混凝土钢桁梁桥跨中竖向位移明显减小;非填充区构件内力变化主要集中在边跨跨中和中跨混凝土填充交界处;填充区内力变化较为剧烈;地震加速度施加方向对部分填充混凝土钢桁梁桥内力影响的变化规律基本相同。
Taking Tianjin Haihe part-filled concrete-filled steel truss girder bridge as the research object, a three-dimensional finite element model of the bridge was established by using the large-scale finite element software ANSYS, and the dynamic characteristics of the bridge were analyzed. Based on these two kinds of seismic load conditions , The seismic response analysis of partially filled concrete-filled steel trussed girder bridge was carried out by dynamic time history method. The results show that the vertical bending and torsional stiffness of the steel truss girder bridge partially filled with concrete are increased, and the corresponding vibration frequency is increased. Under the seismic load, the vertical displacement of the partially filled steel truss bridge The internal forces of the non-filled zone members mainly concentrated in the boundary between the span of the span and the mid-span concrete fill, and the variation of the internal force in the filled zone was more intense. The regularity of the effect of the earthquake acceleration direction on the internal forces of partially filled concrete the same.