Research on time–frequency analysis method of seismic stability of rigid retaining wall subjected to earthquake
Research on time–frequency analysis method of seismic stability of rigid retaining wall subjected to earthquake
复制标题
刚性挡土墙地震稳定性时频分析方法研究
DOI：
10.1007/s12665-018-7325-6
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发表时间：
--
影响因子：
2.8
通讯作者：
Cao Licong
中科院分区：
文献类型：
--
作者：
Yang Changwei;Zhang Jianjing;Wang Zhengzheng;Cao Licong
针对刚性挡土墙地震主动土压力分析方法存在的缺陷，提出了基于弹性波理论和Hilbert-Huang变换的时频计算方法，即全三维非线性时程分析方法。该方法不仅可以考虑双向地震波峰值加速度、频率和持续时间3个因素对地震主动土压力的影响，而且可以为其它类型挡土结构的时频抗震设计提供参考。振动台试验结果验证了该方法的合理性，且比极限平衡法、协调变形法等有代表性的方法精度更高。最后，通过对参数的研究，得到了一些规律和结论：随着PGA的增大，临界破裂角减小，地震主动土压力合力增大，合力作用点逐渐上移;随着频率的增加，临界破裂角和地震主动土压力合力分别呈马鞍形和倒立马鞍形分布。当频率接近刚性挡土墙的固有频率时，它们达到最大值，但作用点基本不变。
Aiming at the drawback existing in the analysis methods of seismic active earth pressure of rigid retaining wall, the time–frequency computational method is proposed based on the elastic wave theory and Hilbert–Huang transform, which is full 3D nonlinear time history analysis method. It not only can consider the effect of three factors (peak ground acceleration, frequency and duration) of the bidirectional seismic wave on the seismic active earth pressure, but also can provide some valuable references for the time–frequency seismic design of other types of retaining structures. The reasonability of this method is verified by the shaking table test results, and it is more accurate than some representative methods such as limit equilibrium method and coordinated deformation method. At last, some rules and conclusions can be obtained by the parameters study, as shown in the following: With the increase in PGA, the critical rupture angle decreases, the resultant force of seismic active earth pressure increases, and its application point of resultant force gradually moves up; with the increase in frequency, the critical rupture angle and the resultant force of seismic active earth pressure are distributed in the shape of saddle and the handstand saddle, respectively. And they achieve the maximum value when the frequency is close to natural frequency of rigid retaining wall, but the application point essentially is unchanged.