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Study on the Aseismic Dynamic Reliability Analysis and Design Based on the Displacement Method for the Gravity Type Earth-retaining Wall

Author: LiZhiQiang
Tutor: ZhangHongRu
School: Beijing Jiaotong University
Course: Geotechnical Engineering
Keywords: earth-retaining wall stochastic seismic response impulse response function perturbation law Double random vibration non-linear dynamic reliability displacement method
CLC: TU476.4
Type: PhD thesis
Year: 2007
Downloads: 680
Quote: 6
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Abstract


The probabilistic design methods based on reliability theory will no doubt be increasingly applied in the aseismic design of geotechnical engineering structures. As earth-retaining wall are among the most frequently encountered geotechnical structures, the ability to predict their safety under seismic conditions using reliability theory in the aseismic design in place of the deterministic approach is of paramount importance in geotechnical practice. So, the main research work covers the following aspects:1. In this paper, a numerical deterministic approach to analyze the stochastic response of structures is proposed, which is based on the random vibration theory and the numerical equivalent unit impulse function theory for structure dynamic analysis. On the basis of the proposed method, the random seismic response regardless of the parameter random with linea earth-retaining wall under the stationary random seismic action is analyzed, at the same time, the influencing factor is also studied.2. The approach for evaluating stochastic properties of earth-retaining wall systems with uncertain parameters under random seismic excitations (double-random problem) is presented. The method is based on the impulse response function method, the perturbation law and random central differential law, on the other hand, the Monte Carlo random simulation analysis is used to verify the precision of the proposal method, which the result was very consistent. So, the above proposed method is a simple and effective approach to analyze the double-random problem.3. The equivalent linear model is used to account for the nonlinearity of soil. On the basis of the proposed method, the nonlinear random seismic response of earth-retaining wall is analyzed. From the results, we can see that considering the nonlinearity of foundation and backfill soil material , the mean square roots response of horizontal displacement has larger increase.4. On the basis of the above random seismic response analysis method, the aseismic reliability of retaining wall is calculated . The analysis flow of dynamic reliability under the action of stationary random seismic action is also presented, which provides a practical way for analyzing the dynamic reliability of geotechnical engineering structures.5. The aseismic design provisions for earth-retaining wall both domestic and abroad are introduced. A example for aseismic design based on the force and displacement methods is done, which can see that the displacement method is more superiority than the force method in the analysis of aseismic performance during the earthquakes conditions of earth-retaining wall.6. A aseismic design method and flow by displacement for earth-retaining wall based on the reliability theory is put forward, which also get the method of the aseismic design by reliability theory for geotechnical engineering structures. In contrast with the other deterministic approach, some conclusions are shown that the reliability method in this paper is more representative from the results.

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Foundation > The basis of the special form > Retaining wall
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