[最新文献]自由场中液化引起体积沉降的概率地震载荷[12/22/2020]

1 论文

Probabilistic Seismic Loading Considerations for the Assessment of Liquefaction-Induced Volumetric Settlements in the Free Field 自由场中液化引起体积沉降的概率地震载荷

Abstract: Engineers have long integrated predicted volumetric strains in liquefied soils to predict free-field, postliquefaction settlements. These free-field settlements have commonly been used to define a lower bound estimate of settlements beneath structures or embankments. Semiempirical methods for predicting volumetric strains during liquefaction require characterization of the seismic loading impacting the soil. The way in which probabilistic estimates of seismic loading is characterized can significantly impact the predicted postliquefaction settlements. This study evaluates three potential approaches for characterizing probabilistic seismic loading and their impact on the computed free-field, postliquefaction volumetric settlement hazard. The pseudo-probabilistic approach, which is arguably the most common approach in engineering practice in the US, shows considerable bias in its predicted volumetric settlements, including an average underprediction of settlement equal to 38% when compared to a fully probabilistic approach at a return period of 2,475 years. A simple linear relationship to correct pseudo-probabilistic estimates of free-field, postliquefaction volumetric settlements at return periods of 475 and 2,475 years for two common semiempirical volumetric strain models is presented.

摘要: 工程师们长期以来一直在综合预测液化土的体积应变，以预测自由场及液化后的沉降。这些自由场沉降通常被用来定义结构或堤岸下沉降的下限估计。预测液化过程中体积应变的半经验方法需要对影响土的地震荷载进行描述。对地震荷载的概率估计表征的方式会对预测的液化后沉降产生重大影响。本研究评价了三种潜在的概率地震荷载表征方法及其对计算的自由场、液化后体积沉降危害的影响。伪概率方法可以说是美国工程实践中最常用的方法，但它在预测体积沉降时表现出相当大的偏差，包括在重现期为2475年时，与完全概率方法相比，沉降的平均预测不足相当于38%。介绍了一种简单的线性关系，以纠正两种常见的半经验体积应变模型在475年和2,475年回归期的自由场、液化后体积沉降的伪概率估计。

2 相关文献

Note: '相关文献' 是按照Google的排序算法产生出来的.

[1] Overestimation of liquefaction hazard in areas of low to moderate seismicity due to improper characterization of probabilistic seismic loading

[2] Probabilistic Liquefaction Analysis

[3] Probabilistic evaluation of seismic soil liquefaction potential based on SPT data

[4] Probabilistic seismic liquefaction hazard assessment of Kathmandu valley, Nepal

[5] Probabilistic-Based Assessment of Liquefaction-Induced Damage with Analytical Fragility Curves

[6] Recommended guidelines for liquefaction evaluations using ground motions from probabilistic seismic hazard analyses 

[7] Applicability of Pseudoprobabilistic Method of Liquefaction Hazard Assessment for Nuclear Power Plants at Diffuse Seismicity Sites

[8] Probabilistic Liquefaction Potential Evaluation for India and Adjoining Areas

[9] Performance-Based Liquefaction Potential Evaluation

[10] State-of-the-art of geotechnical earthquake engineering practice

Computer-aided SPT-based reliability model for probability of liquefaction using hybrid PSO and GA

[11] Probabilistic assessment of liquefaction initiation hazard

3 参考文献

[1] ] Liao, S. S. C., Veneziano, D. and Whitman, R. V. (1988). “Regression Models for Evaluating Liquefaction Probability”, Journal of Geotechnical Engineering, Vol. 114, No 4, April, pp.389-410.

[2] ] Liao, S. S. C., Lum, K. Y. (1998). “Statistical Analysis and Application of the Magnitude Scaling Factor in Liquefaction Analysis”, Geotechnical Special Publication No. 75, ASCE.

[3] ]Youd, T. L. and Noble, S. T. (1997). “Liquefaction Criteria Based on Statistical and Probabilistic Analyses”, Technical Report NCEER-97-0022, National Center for Earthquake Engineering Research, SUNY, Buffalo, New York

[4] ]Halder, A.; Tang, W.H. Probabilistic evaluation of liquefaction potential. J. Geotech. Eng. ASCE 1979, 104, 145–162.

[5] Juang, C.H.; Rosowsky, D.V.; Tang, W.H. Reliability based method for assessing liquefaction potential of soils. J. Geotech. Geoenviron. Eng. 1999, 125, 684–689. 

[6] ]Cetin, K.O., Der Kiureghian, A., and Seed, R.B. (2002). “Probabilistic models for the initiation of seismic soil liquefaction,” Structural Safety, 24(1), 67-82.

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