Reliability Analysis of Liquefaction Evaluation Discriminant of Chinese Seismic Code

Abstract eng:
The liquefaction-induced damage phenomena have occurred during many earthquakes in last century in China, including the Heyuan Earthquake in 1962, the Xingtai Earthquake in 1966, the Bohai Earthquake in 1969, the Yangjiang Earthquake in 1969, the Tonghai Earthquake in 1970, the Haicheng Earthquake in 1975 and the Tangshan Earthquake in 1976. The discriminant for liquefaction evaluation in the Chinese code is developed by the in-situ investigation on above earthquakes. However, some researchers doubt the reliability of the discriminant and two issues are needed to be further studied. One is that there are different results for the success ratio of re-discrimination using the original data. The other is the success ratio of prediction for new earthquakes data and this work has never been conducted. The reliability of the liquefaction evaluation discriminant of the Chinese code is analyzed in the paper. The success ratio of re-discrimination is attained by using the 159 SPT data in the earthquake of China. The 288 SPT cases in the Chi-Chi Earthquake are employed to verify the success ratio of prediction for new earthquakes data. The results here show: (1) The success ratio of re-discrimination is 88% and 79%, separately for the liquefied and the non-liquefied sites; (2) The success ratio of prediction for the Chi-Chi Earthquake data is 80% and 90%, separately for the liquefied sites and the non-liquefied sites, and the average prediction success ratio is 85%; (3) Although the success ratios of re-discrimination for original data and prediction for the new data both are accuracy in engineering meaning, the detailed analysis shows that liquefaction evaluation discriminant of the Chinese seismic code easily makes mistakes for the soft sites in the low intensity as well as for the hard sites in the high density, and the non-liquefied sites are easily evaluated as liquefied ones in these cases.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket