墩身高阶振型对高墩地震反应影响
发布时间：2019-01-05 07:42
【摘要】：采用增量动力分析的方法,全面讨论了墩身高阶振型对桥梁结构地震反应的影响.首先分析了现有规范中的桥梁抗震设计方法应用于高墩的局限性;随后采用了增量动力分析方法,在考虑墩身高阶振型效应的情况下,对高墩桥梁结构在地震作用下的性能进行了研究.结果表明:由于墩身高阶振型贡献,高墩在强震作用下可能沿墩身产生多个塑性区域;墩顶位移与墩底曲率不再同步变化,高墩墩顶极限位移不能采用规范中的方法进行计算;高墩墩身的地震剪力及弯矩需求也会由于墩身高阶振型的显著影响而变得十分复杂.最后提出了针对高墩抗震设计的一些改进措施.
[Abstract]:By means of incremental dynamic analysis, the influence of high order vibration modes of pier body on the seismic response of bridge structure is discussed. Firstly, the limitations of the seismic design methods of bridges in the existing codes for high piers are analyzed. Then the incremental dynamic analysis method is used to study the seismic behavior of the bridge structure with high pier under the consideration of the higher-order mode effect of the pier body. The results show that due to the contribution of higher vibration modes of pier body, many plastic regions may occur along the pier body under the action of strong earthquake, the displacement of pier top and the curvature of bottom of pier no longer change synchronously, and the limit displacement of top of high pier can not be calculated by the method in the code. The seismic shear and bending moment requirements of the pier are also complicated by the influence of the high-order vibration modes of the pier. Finally, some improvement measures for seismic design of high pier are put forward.
【作者单位】： 同济大学土木工程学院;
【基金】：基金项目:国家“九七三”重点基础研究发展规划(2013CB036302)
【分类号】：U442.55
[Abstract]:By means of incremental dynamic analysis, the influence of high order vibration modes of pier body on the seismic response of bridge structure is discussed. Firstly, the limitations of the seismic design methods of bridges in the existing codes for high piers are analyzed. Then the incremental dynamic analysis method is used to study the seismic behavior of the bridge structure with high pier under the consideration of the higher-order mode effect of the pier body. The results show that due to the contribution of higher vibration modes of pier body, many plastic regions may occur along the pier body under the action of strong earthquake, the displacement of pier top and the curvature of bottom of pier no longer change synchronously, and the limit displacement of top of high pier can not be calculated by the method in the code. The seismic shear and bending moment requirements of the pier are also complicated by the influence of the high-order vibration modes of the pier. Finally, some improvement measures for seismic design of high pier are put forward.
【作者单位】： 同济大学土木工程学院;
【基金】：基金项目:国家“九七三”重点基础研究发展规划(2013CB036302)
【分类号】：U442.55
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