| 中国西部地区场地放大模型 |
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| 引用本文： | 姜治军,胡进军,谢礼立,张齐.中国西部地区场地放大模型[J].天津大学学报(自然科学与工程技术版),2013(12):1071-1078. |
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| 作者姓名： | 姜治军 胡进军 谢礼立 张齐 |
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| 作者单位： | [1]中国地震局工程力学研究所,哈尔滨150080 [2]中国地震局地震工程与工程振动重点实验室,哈尔滨150080 [3]哈尔滨工业大学土木工程学院,哈尔滨150090 |
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| 基金项目： | 中国地震局工程力学研究所基本科研业务费专项资助项目（2011802）;国家重点基础研究发展计划（973计划）资助项目（2011CB013601）;国家自然科学基金重点资助项目（51238012,9121530113,50938006）;国家国际科技合作专项资助项目（2012DFA70810）.致谢：感谢国家自然科学基金重点资助项目（50938006,9121530113,51238012）、国家重点基础研究发展计划（973计划）资助项目（2011CB013601）、地震行业科研专项（201208013）、国家国际科技合作专项资助项目（2012DFA70810）和中国地震局工程力学研究所基本科研业务费专项项目（2011802）的资助.感谢中国地震局工程力学研究所“国家强震动台网中心”为本研究提供数据支持. |
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| 摘 要： | 为探讨场地对地震动的影响，选取汶川地震主震、余震记录及美国下一代地震动衰减关系（NGA）项目的强震记录，通过比较地震动观测值与基岩衰减关系预测值得到场地放大系数．分析得出以Vs30和参考地震动为变量的场地放大连续函数模型．模型考虑了场地的K30对地震动影响的差异，反映了汶川地区场地条件对地震动的影响．通过随机效应方法回归了模型系数．模型结果表明：当参考地震动小于45～55gal时，其对场地放大无影响；当参考地震动大于45～55gal时，相同场地上随其增大场地放大系数减小；而且参考地震动对软场地上短周期地震动的场地放大影响显著，对硬土场地影响不显著．
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| 关 键 词： | 参考地震动 场地放大 地震动衰减关系 汶川地震 |
Model of Site Amplification Factor for Western China |
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| Jiang Zhijun,Hu Jinjun,Xie Lili,Zhang Qi.Model of Site Amplification Factor for Western China[J].Journal of Tianjin University(Science and Technology),2013(12):1071-1078. |
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| Authors: | Jiang Zhijun Hu Jinjun Xie Lili Zhang Qi |
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| Institution: | 1. Institute of Engineering Mechanics , China Earthquake Administration, Harbin l50080, China; 2. Key Laboratory of Earthquake Engineering and Engineering Vibration, China Earthquake Administration, Harbin 150080, China; 3. School ofCivilEngineering, Harbin Institute of Technology, Harbin 150090, China) |
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| Abstract: | To investigate the effect of site condition on ground motion, strong motion records of Wenchuan earth- quake and next generation attenuation （NGA） were used in this study. Site amplification factors were obtained by com- paring the spectral accelerations from recordings and rock attenuation relationship. A model for ground motion ampli- fication which is dependent on Vs30 and reference ground motion was developed. The model takes into account the influence of different Fs30 within the same site category on ground motion and reflects the site condition specialty of Wenchuan area. The coefficients were estimated using random effect method. It is shown that the site factor is inde- pendent of reference ground motion lower than 45--55 gal. The factor decreases with increasing reference motion when it is greater than 45--55 gal. The reference ground motion has an appreciable impact on low-period motion but has no influence on long-period and hard soil site. |
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| Keywords: | reference ground motion site amplification ground motion attenuation Wenchuan earthquake |
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