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A platform for research: civil engineering, architecture and urbanism
Soil-structure interaction under multi-directional earthquake loading
The dynamic interaction between the soil and the structure resting on it during earthquakes can alter the response characteristics both of the structure and the soil. Despite significant efforts over the past decades, the interaction effect is not yet fully understood and is sometimes misunderstood. In the context of performance based design, there remain a number of uncertainties to be addressed seriously. Current practice of seismic soil-structure response analysis has tended to focus on the effect of horizontal motion although actual ground motions are comprised of both horizontal and vertical components. In several recent earthquakes, very strong vertical ground motions have been recorded, raising great concern over the potential effect of vertical motion on engineering structures. To address this emerging problem, seismic response considering the soil-structure interaction effect to both vertical and horizontal earthquake motions needs to be investigated. This thesis presents a simple and practical framework for the analysis of site response and soil-structure interaction to both horizontal and vertical earthquake motions, which can take into account the soil nonlinearity and material damping effect. The analysis procedure involves the use of the dynamic stiffness matrix method and equivalent-linear approach and is built in the modern MATLAB environment to take the full advantages of the matrix operations in MATLAB. The input motions can be specified at the soil–bedrock interface or a rock outcropping. A detailed assessment of the procedure is provided to illustrate that the procedure is able to produce acceptable predictions of both vertical and horizontal response of soil-structure systems. It is shown that soil nonlinearity plays an important role in altering the response of the structure and soil, and the methods of analysis for soil-structure interaction adopted in current engineering practice may not be able to adequately account for soil nonlinearity. Furthermore, effects of a number of influencing factors, such as material damping ratio, Poisson’s ratio of soil, intensity and location of input motion and the embedment ratio of the foundation are examined, leading to several useful implications for seismic engineering practice. ; published_or_final_version ; Civil Engineering ; Doctoral ; Doctor of Philosophy
Soil-structure interaction under multi-directional earthquake loading
The dynamic interaction between the soil and the structure resting on it during earthquakes can alter the response characteristics both of the structure and the soil. Despite significant efforts over the past decades, the interaction effect is not yet fully understood and is sometimes misunderstood. In the context of performance based design, there remain a number of uncertainties to be addressed seriously. Current practice of seismic soil-structure response analysis has tended to focus on the effect of horizontal motion although actual ground motions are comprised of both horizontal and vertical components. In several recent earthquakes, very strong vertical ground motions have been recorded, raising great concern over the potential effect of vertical motion on engineering structures. To address this emerging problem, seismic response considering the soil-structure interaction effect to both vertical and horizontal earthquake motions needs to be investigated. This thesis presents a simple and practical framework for the analysis of site response and soil-structure interaction to both horizontal and vertical earthquake motions, which can take into account the soil nonlinearity and material damping effect. The analysis procedure involves the use of the dynamic stiffness matrix method and equivalent-linear approach and is built in the modern MATLAB environment to take the full advantages of the matrix operations in MATLAB. The input motions can be specified at the soil–bedrock interface or a rock outcropping. A detailed assessment of the procedure is provided to illustrate that the procedure is able to produce acceptable predictions of both vertical and horizontal response of soil-structure systems. It is shown that soil nonlinearity plays an important role in altering the response of the structure and soil, and the methods of analysis for soil-structure interaction adopted in current engineering practice may not be able to adequately account for soil nonlinearity. Furthermore, effects of a number of influencing factors, such as material damping ratio, Poisson’s ratio of soil, intensity and location of input motion and the embedment ratio of the foundation are examined, leading to several useful implications for seismic engineering practice. ; published_or_final_version ; Civil Engineering ; Doctoral ; Doctor of Philosophy
Soil-structure interaction under multi-directional earthquake loading
Yan, Xiaorong. (author) / 閆晓荣. (author)
2012-01-01
http://hub.hku.hk/bib/B48199217
Theses
Electronic Resource
English
DDC:
621
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