Test errors of dynamic shear modulus and damping ratio and its risk assessment for surface ground motion

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (19) : 195-205.

LI Xiao-fei1,2，WANG Yunlong1, SUN Rui1，LI Bo2

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Abstract

To study the testing errors of nonlinear dynamic shear modulus ratio and damping ratio using resonant column apparatus and their effect on ground motion, the testing errors of dynamic shear modulus and damping ratio and the probability distribution characteristics are presented. The influence of testing errors on calculating surface ground motion is analyzed and the risk level of the influence is presented by numerical simulation. Two experimental groups representing the largest and the smallest dispersion are designed, and then the probability distribution characteristics of testing errors are obtained. The results of risk assessment of the influence of testing errors on surface ground motion are simulated by inputting typical seismic motion but varying amplitudes on three classes of sites. The results show that the testing errors of dynamic shear modulus ratio and damping ratio of the two groups are both normally distributed with close mean values, but the variation coefficients of the two groups are different by 5 times. The influence of testing errors of dynamic shear modulus ratio and damping ratio on surface ground motion increases with increasing testing errors, softening of site and increasing earthquake intensity, yet the testing errors and site classes play major roles. Taking the fact that the influence on the surface ground motion cannot be ignored as a threshold, the influence of testing errors of dynamic shear modulus and damping ratio by the preliminary group has 35% and 50% of the risk for medium stiff site and soft site, respectively. Therefore, it is suggested to strengthen the technical regulations of resonance column tests, and to improve the technicians’ skills, otherwise it will cause significant risk to the ground-motion input for engineering structures.

Key words

dynamic shear modulus ratio and damping ratio / test error / probability distribution / ground motion / risk assessment

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LI Xiao-fei1,2，WANG Yunlong1, SUN Rui1，LI Bo2. Test errors of dynamic shear modulus and damping ratio and its risk assessment for surface ground motion[J]. Journal of Vibration and Shock, 2017, 36(19): 195-205

References

[1] 李小勇, 谢康和, 虞颜. 太原粉质黏土强度指标概率特征[J]. 浙江大学学报：工学版, 2001, 35(5): 492-496.
LI Xiao-yong, XIE Kang-he, YU Yan. Probabilistic characteristics of strength indexes for Taiyuan siltyclay[J]. Journal of Zhejiang University: Engineering Science, 2001, 35(5): 492-496.
[2] 陈龙伟, 汪云龙, 袁晓铭. 土层特性变异性对场地传递函数的影响[J].防灾减灾工程学报, 2014, 31(1): 78-84.
CHEN Long-wei, WANG Yun-long, YUAN Xiao-ming.Influence of variability of soil characteristics on site transfer function[J].Journal of Disaster Prevention and Mitigation Engineering, 2014, 31(1): 78-84.
[3] 倪万魁, 韩启龙. 黄土土性参数的统计分析[J]. 工程地质学报, 2001, 9(1): 62-67.
NI Wan-kui, HAN Qi-long. Statistical analysis of physical and mechanical indexes of the typical loess[J]. Journal of Engineering Geology, 2001, 9(1): 62-67.
[4] 王绍博, 丁海平. 土动力学参数对土层动力反应的影响[J]. 地震工程与工程振动, 2001, 21(1): 105-108.
WANG Shao-bo, DING Hai-ping. Effect of soil dynamic parameters on seismic response of soil layers[J]. EarthquakeEngineering and Engineering Vibration, 2001, 21(1): 105-108.
[5] GB 17741-2005.工程场地地震安全性评价技术规范[S].北京: 中国标准出版社, 2005.
GB 17741-2005.Code for seismic safety evaluation of engineering sites[S].Beijing: Chinese Standard Press, 2005.
[6] 祝龙根, 杜坚. 不同类型共振柱仪对比实验[J]. 水电自动化与大坝监测, 1990(3): 26-32.
ZHU Long-gen, DU Jian. Comparison tests with different types of resonant column devices[J]. Hydropower Automation and Dam Monitoring, 1990(3): 26-32.
[7] 袁晓铭, 孙锐, 孙静, 等. 常规土类动剪切模量比和阻尼比试验研究[J]. 地震工程与工程振动, 2000, 20(4): 133-140.
YUAN Xiao-ming, SUN Rui,SUN Jing, et al. Laboratory experimental study on dynamic shear modulus ratio and damping ratio of soils[J].Earthquake Engineering and Engineering Vibration, 2000, 20(4): 133-140.
[8] 孙静, 袁晓铭. 土的动模量和阻尼比研究述评[J].世界地震工程, 2003, 19(l): 88-95.
SUN Jing, YUAN Xiao-ming.A state-of-art of research on dynamic modulus and damping ratio of soils[J].World Earthquake Engineering, 2003, 19(l): 88-95.
[9] 陈国兴, 刘雪珠, 王炳辉. 土动力参数变异性对深软场地地表地震动参数的影响[J]. 防灾减灾工程学报. 2007, 27(1): 1-10.
CHEN Guo-xing, LIU Xue-zhu, WANG Bing-hui. Effect of variability of soil dynamic parameters on ground motion parameters for deep soft sites[J]. Journal of Disaster Prevention and Mitigation Engineering, 2007, 27(1): 1-10.
[10] 兰青龙, 贺明华, 安卫平. 太原地区场地土动力性能的统计分析[J]. 山西地震, 1997(3): 6-11.
LAN Qing-long, HE Ming-hua, AN Wei-ping. Several features of earthquake swarm in Taiyuan basin[J]. Earthquake Research in Shan Xi, 1997(3): 6-11.
[11] 李剑, 陈善雄, 姜领发, 等. 重塑红黏土动剪切模量与阻尼比的共振柱试验[J]. 四川大学学报(工程科学版), 2003, 45(4):62-68.
LI Jian, CHEN Shan-xiong, JIANG Ling-fa, et al. Resonant Column Teston Dynamic Shear Modulus and Damping Ratio of the Remolded Red Clay[J].Journalof Si Chuan University: Engineering Science Edition, 2003, 45(4):62-68.
[12] I.M Idriss, H.B Seed. Seismic response of horizontal soil layers[J].Journal of the Soil Mechanics and Foundations Division, ASCE, 1968, 94(4):1003-1031.
[13] 孙锐, 袁晓铭, 刘晓健. 动剪切模量比与剪切波速对地震动影响及等量关系研究[J]. 岩土工程学报, 2009, 31(8): 1267-1274.
SUN Rui, YUAN Xiao-ming,LIU Xiao-jian.Effects of dynamic shear modulus ratio and velocity on surface ground motion and their equivalent relations[J].ChineseJournal of Geotechnical Engineering, 2009, 31(8): 1267-1274.
[14] 陈红娟. 土动力非线性的变异性及其对地震动影响的概率分析[D]. 哈尔滨: 中国地震局工程力学研究所, 2009.
CHEN Hong-juan, Variability of soil nonlinear dynamic feature and probability analysis of its effect on ground motion[D]. Harbin: Institute of Engineering Mechanics, China Earthquake Administration,2009.
[15] 李晓飞, 孙锐, 袁晓铭, 等. 现有等效线性化分析程序在实际软场地计算结果方面的比较[J]. 自然灾害学报, 2015, 24(4): 56-62.
LI Xiao-fei, SUN Rui, YUAN Xiao-ming, et al. Comparison of existing equivalent linear response analysis program for actual soft site in KiK-net array[J].Journal of Natural Disaster, 2015, 24(4): 56-62.
[16] SL237-1999.土工实验规程[S]. 北京：中华水利水电出版社, 1999.
SL237-1999.Specification of soil test[S].Beijing: China Water & Power Press, 1999.
[17] 梁冯珍, 关静, 等. 统计学[M]. 北京: 机械工业出版社, 2014.
LIANG Feng-zhen, GUAN Jing, et al. Statistics for Engineers and the Sciences[M]. Beijing: China Machine Press, 2014.