| 地下结构抗震设计的改进等效反应加速度法 |
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| 引用本文： | 禹海涛,张正伟,李 攀.地下结构抗震设计的改进等效反应加速度法[J].岩土力学,2020,41(7):2401-2410. |
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| 作者姓名： | 禹海涛 张正伟 李 攀 |
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| 作者单位： | 1. 同济大学 岩土及地下工程教育部重点实验室，上海 200092；2. 上海市政工程设计研究总院（集团）有限公司，上海 200092；
3. 上海市城市建设设计研究总院（集团）有限公司，上海 200125；4. 苏州大学 轨道交通学院，苏州 215131 |
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| 基金项目： | 国家自然科学基金项目（No.41922059，No.51978431，No. 51678438)；国家重点研发计划项目（No.2018YFC1504305，No.2018YFC0809602，No.2017YFC1500703）；上海市青年科技启明星计划资助（No.17QC1400500）；上海市科学技术委员会（No.18DZ1205103，No.17DZ1203804，No.17DZ1203402)。 |
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| 摘 要： | 对地下结构横向抗震分析中的等效反应加速度法进行综合分析。结合算例，以动力时程法为基准，全面评价了等效反应加速度法的适用性；进而深入分析其误差来源，并做针对性改进优化，通过引入动力响应调整系数β，提出了一种改进等效反应加速度法；结合算例分析，评价了改进等效反应加速度法对不同工况的适用性。结果表明：等效反应加速度法计算所得结构内力及变形均偏小；且计算精度随地层剪切波速的增大整体呈上升趋势，但几乎不受结构埋深的影响；同时，明确了等效反应加速度法的误差源自于其忽略了地下结构对其周围土体动力响应的干扰作用，改进优化后提出了改进等效反应加速度法；相比现有等效反应加速度法，改进等效反应加速度法具有更广泛的适用性及更优的计算精度，可为地下结构抗震设计和分析提供新的计算方法。
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| 关 键 词： | 地下结构 抗震设计 动力时程法 等效反应加速度法 改进等效反应加速度法 |
| 收稿时间： | 2019-07-30 |
| 修稿时间： | 2019-12-16 |
Improved equivalent response acceleration method for seismic design of underground structures |
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| YU Hai-tao,ZHANG Zheng-wei,LI Pan.Improved equivalent response acceleration method for seismic design of underground structures[J].Rock and Soil Mechanics,2020,41(7):2401-2410. |
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| Authors: | YU Hai-tao ZHANG Zheng-wei LI Pan |
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| Institution: | 1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 2. Shanghai Municipal Engineering Design Institute (Group) Company Limited, Shanghai 200092, China; 3. Shanghai Urban Construction Design & Research Institute (Group) Company Limited, Shanghai 200125, China; 4. School of Rail Transportation, Soochow University, Suzhou, Jiangsu 215131, China |
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| Abstract: | The equivalent response acceleration method for transverse seismic analysis of underground structures is systematically studied in this paper. Firstly, results of the dynamic time history analysis method are set as the benchmark to evaluate the adaptability of the equivalent response acceleration method through numerical examples. Then, error sources of the equivalent response acceleration method are dissected and overcome. An improved equivalent response acceleration method is proposed by introducing the dynamic response adjustment coefficient β. Finally, the applicability of the proposed method is evaluated through numerical examples. Results show that, the results of internal forces and deformations obtained from the equivalent response acceleration method are all smaller than those from dynamic time history analysis method. Moreover, its accuracy can be improved with the increase of soil shear velocity but less affected by the buried depth. Further research finds that the error of the equivalent response acceleration method comes from the fact that, the interference effect of the underground structure on the dynamic response of the surrounding soil is ignored in the method. After improvement and optimization, the improved equivalent response acceleration method is proposed to further consider the interference effect. Compared to the traditional equivalent response acceleration method, the proposed method has a wider applicability and better calculation accuracy, which provides a novel approach for seismic design and analysis of underground structures. |
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| Keywords: | underground structures seismic design dynamic time-history analysis method equivalent response acceleration method improved equivalent response acceleration method |
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