| 张佳文,李明超,韩帅,闫文钰,张敬宜.非一致地震作用下高坝-复杂地基体系动力响应分析[J].水利学报,2023,54(9):1099-1110,1121 |
| 非一致地震作用下高坝-复杂地基体系动力响应分析 |
| Dynamic response analysis of high dam-complex foundation system undernon-uniform seismic waves |
| 投稿时间：2023-01-10 |
| DOI：10.13243/j.cnki.slxb.20230019 |
| 中文关键词: 高坝-复杂地基体系 非一致地震波场 行波效应 斜入射地震波 动力响应 并行计算 |
| 英文关键词: high dam-complex foundation system non-uniform seismic wave field traveling wave effect oblique incidence seismic wave dynamic response parallel computing |
| 基金项目:国家自然科学基金项目(51879185);国家自然科学面上基金项目(52179139);天津大学自主创新基金项目(2023XJD-0065) |
|
| 摘要点击次数: 1306 |
| 全文下载次数: 2207 |
| 中文摘要: |
| 地震波场的构建与输入是高坝抗震分析的关键。本文提出了一种适用于三维成层场地的自由波场时域化求解方法，并在此基础上建立了远置层界面模型以分离上行和下行波场，以解决不规则场地和断层分布等复杂地质条件;进而结合不同波型的连续性特征与振动特性，利用几何推导将单列节点位移推广至整个空间场地，以提高计算效率;并采用改进的波动输入方法将复杂波场转换为地基边界上的等效节点力。本文重点研究了精细化的三维高坝-地基体系在垂直和倾斜入射SV波作用下的动力响应，并与均质地基条件下的结果进行对比。结果表明：非一致地震波作用下坝体结构动力响应的空间差异性显著，坝顶不同位置的位移极值响应可相差至80%;SV波倾斜入射时坝体振动响应远大于垂直入射的情况，位移极值可相差2~3倍，高应力区时段相差较大，且整个体系的拉裂破坏范围更广;复杂地质条件会加剧坝体的损伤情况，且对较大应力区的产生时间与分布情况有显著影响。研究结果证实了综合考虑地震波的非一致特性与场地地质条件的必要性，可为其他大型工程结构抗震响应分析提供参考。 |
| 英文摘要: |
| The construction and input of seismic wave fields are the key factors in the seismic analysis of high dam structures.This paper proposes a time-domain method for solving the free wave field under a three-dimensional layered foundation.A remote layering interface model is established to separate the upgoing and downgoing wave fields，which can solve the construction of wave fields in complex geological structures such as irregular sites.Combined with the continuity and vibration characteristics of different wave patterns，the single column node displacements are extended to the whole site by geometric derivation to improve the solving efficiency.An improved wave input method is used to convert the complex wave field into the equivalent nodal force on the foundation boundaries.The response of the 3D high dam-foundation system under vertical and oblique incident SV waves is studied，and the results are compared with those of homogeneous foundations;all the examples are completed on the supercomputer center platform.The results show that the dynamic response of the dam under non-uniform seismic waves has a significant spatial difference，and the maximum displacement response at different locations of the dam crest can vary by up to 80%.When the SV wave is obliquely incident，the vibration response of the dam is much larger than that of the vertical incidence：the extreme displacement value can be different by 2-3 times，and the time period of high stress area is different greatly，and the scope of tensile cracking of system is wider.Complex geological conditions will aggravate the dam's damage and significantly influence the distribution of high-stress regions.This paper proves that it is necessary to consider the non-uniform characteristics of seismic waves and the geological structure of the site，which can provide a reference for the seismic response analysis. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |