【摘要】 以最高墩为179m的高墩大跨连续刚构桥-龙潭河特大桥为例,通过有限元程序ANSYS,采用时程分析与特征值屈曲分析相结合的方法对该桥在地震作用下的弹性动力稳定问题进行了研究。文中讨论了不同地震波输入方向、阻尼比以及不同约束条件对该桥第一类动力稳定问题的影响,得出了该桥的最不利地震输入方向、弹性稳定临界荷载及失稳模态,并评价了该桥的抗震性能。更多还原

【Abstract】 By combining the time-history response analysis and the eigenvalue-buckling analysis methods,the elastic dynamic stability of a long-span continuous rigid frame bridge with 179m high-pier,which is the Longtan River Bridge,under the seismic action is investigated with the ANSYS program.The influence of different restriction conditions,the input directions of the earthquake and the damping ratios on the elastic dynamic stability of that bridge are discussed in detail.Finally,the critical load and the input direction are got as well as the buckling modes.The seismic performance of that bridge is evaluated also.更多还原