【摘要】 为了研究结构参数对弯连续刚构桥动力性质的影响,以一高墩弯连续刚构桥为工程背景,基于ANSYS有限元程序,考虑桩土与结构的相互作用,建立了有限元空间分析模型,分析了系梁的道数、系梁的刚度、系梁的位置等3个因素24个不同计算工况对结构自振特性的影响,通过线弹性时程法讨论了在不同参数设置下桥梁结构的地震响应规律.计算结果表明,系梁道数及其刚度明显改变了结构的振型序列,对结构顺桥向地震响应的影响较大,而在其它条件一定时,改变系梁的位置对桥梁结构的自振特性及地震响应影响不大.从动力学上讲,应尽量减小系梁的道数及其刚度.研究结论可为桥梁初步设计提供依据,也可供同类桥梁抗震概念设计参考.更多还原

【Abstract】 In order to investigate the effect of structural parameters on the dynamic behavior of rigid frame bridge,a curved rigid frame bridge with high piers and long span was taken as an example,the finite element program ANSYS was employed to establish its spatial finite element mode considering the interaction of soil and structure,then 3 parameters and 24 different calculation modes were analyzed to study the structural natural vibration characteristic,the parameters included the number of tie beams,rigidity of tie beams and position of tie beams,finally linear time history method was used to discuss the effect of tie beam on the structural seismic response.The results showed that the number of tie beams and its rigidity remarkably changed the structural vibration mode sequence and had great effect on the longitudinal seismic response of the structure,whereas,the structural vibration characteristic and seismic response had little relationship with the position of tie beams.Therefore,few tie beams and less rigidity should be set.The study can give reference to the preliminary design and seismic conceptual design for the same kind of bridge.更多还原