Dynamic analysis of Soil-Foundation Interaction
Translated title
Dynamisk analyse af Jord-Fundament Interaktion
Author
Prins, Joeri Nithan
Term
4. term
Education
Publication year
2016
Submitted on
2016-06-03
Pages
88
Abstract
Dette projekt undersøger den dynamiske interaktion mellem jord og fundamenter, dvs. jord–struktur‑interaktion (SSI) og struktur–jord–struktur‑interaktion (SSSI). Fokus er på, hvordan vibrationsbølger udbreder sig i jorden ved frekvenser, der er typiske for menneskeskabte miljøvibrationer. Arbejdet udføres i tidsdomænet, hvor bevægelserne følges over tid. Først gennemgås den grundlæggende teori, og på den baggrund opstilles en enkel model for overfladebølger. Derefter udvikles en endelig‑element‑model (en numerisk beregningsmetode), og de to tilgange sammenlignes for at belyse deres styrker og begrænsninger. Efter at have fastlagt forudsætninger og grundlæggende egenskaber undersøges de faktiske bølgemønstre i jorden i tidsdomænet. Flere parametre varieres, og deres indflydelse på resultaterne forklares. I den sidste del analyseres interaktionen mellem fundamenter ved at påføre forskellige fundamentskonfigurationer puls‑ og harmoniske laster. De lodrette responser på et andet, nærliggende fundament evalueres for at belyse koblingen gennem jorden. Resultaterne munder ud i et forslag til, hvordan modellen kan forenkles.
This thesis investigates the dynamic interaction between soil and foundations, covering soil–structure interaction (SSI) and structure–soil–structure interaction (SSSI). The focus is on how vibration waves propagate through the ground at frequencies typical of man‑made environmental vibrations. All analyses are carried out in the time domain, tracking motions over time. First, the basic theory is reviewed and used to build a simple model for surface waves. Next, a finite element model (a numerical simulation method) is developed, and the two approaches are compared to highlight their strengths and limitations. After stating assumptions and basic properties, the actual wave patterns in the soil are studied in the time domain. Different parameters are varied, and their influence on the results is explained. In the final part, interactions between foundations are examined by exciting different foundation configurations with pulse and harmonic loads. The vertical responses at another foundation some distance away are analyzed to reveal the coupling through the soil. These findings lead to a suggestion for simplifying the model.
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