A Simple Estimation Method of the Probability Distribution of Residual Deformation of Quay Walls Considering Variation of Earthquake Ground Motion


Abstract eng:
A major criterion of damage levels of a gravity type quay wall by an earthquake is residual deformation. For example, maximum residual deformations of gravity type quay walls at Kobe port by the 1995 South Hyogo Prefecture Earthquake were about 5 meter although structural members of quay walls were not damaged. Therefore, evaluation of residual deformation is necessary in the design procedure about gravity type quay walls. However, evaluation of residual deformations of gravity type quay walls cannot be conducted analytically because the deformation is caused by shear deformation of foundation soil layers and so on. Two-dimensional finite element earthquake response analysis considering non-linear characteristics and effects of liquefaction of soil layers can be used for the evaluation of the residual deformation but there is a problem in the computational load for that kind of analysis. At present, introduction of reliability-based design method in view of residual deformation to practical design of gravity type quay walls is very difficult because designers must conduct the analysis many times in order to obtain the probability distribution of residual deformations of the quay wall. We aim at proposing a simple estimation method of the probability distribution of residual deformations of gravity type quay walls considering the variation of earthquake ground motion. The characteristics of earthquake ground motions are divided into the source effects, the pass effects and the local site effects. We focus on the site effects considering variations in the effects by collecting strong motion record. Then two-dimensional finite element earthquake response analysis were conducted by using 136 seismic input motions which reflect the variations in the site amplification factors and the site phase characteristics. The probability distribution of the residual deformations of a gravity type quay wall were obtained. The probability distribution of residual deformations was found to be approximated by the logarithmic normal distribution. Next, the average and the standard deviation of the probability distribution were evaluated for the simple estimation method. Two-dimensional finite element earthquake response analysis were conducted by using 3 input motions: the logarithmic mean of the site amplification factors(λ), λ plus and minus the logarithmic standard deviation(ζ). The logarithmic mean and the logarithmic standard deviation were evaluated according to the sum of amplification in the range of 0.5 – 5.0 Hz. The distribution of the residual deformations of the quay wall was simply estimated with the residual deformations by 3 earthquake response analysis.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 255.:
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