Soil-Structure Interaction

In summary, stiff soil like tuff rock is more in resonance with short storey buildings, meaning during seismic movement, the response in the short storey buildings would be greater. There is no specific formula to relate the two, but for a specified seismic wave, the frequency spectrum of the vibration is the same, while the amplitude of oscillation is greater in slower rocks. This is due to the energy density of the wave being higher in slower rocks. Therefore, small buildings built on low velocity rocks will experience greater shaking than tall buildings built on fast rocks.
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Stiff soil like tuff rock is said to be in resonance with short storey buildings (like 2 to 3 storey).. meaning during seismic movement the response in the short storey buildings would be greater. Is there any formula that can relate the two... like does stiff soil has the same frequency as short storey buildings when they shake??
 
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  • #2
dahoa said:
Stiff soil like tuff rock is said to be in resonance with short storey buildings (like 2 to 3 storey).. meaning during seismic movement the response in the short storey buildings would be greater. Is there any formula that can relate the two... like does stiff soil has the same frequency as short storey buildings when they shake??
Hi ya

I'm not going to personally give an answer when there is so much more professional info online
have a look at some of these linkshttps://www.researchgate.net/publication/237709756_Seismic_Response_at_Soft_Ground_Sites_Bay_of_Plenty

https://www.researchgate.net/publication/321036988_Experimental_Study_on_the_Seismic_Response_of_Subway_Station_in_Soft_Ground

https://www.ijser.org/researchpaper/Evaluation-of-seismic-response-of-a-building-with-soft-story.pdf

https://www.pwri.go.jp/eng/ujnr/joint/33/paper/61sato.pdf

https://pubs.usgs.gov/of/1996/ofr-96-0263/localeff.htm

http://users.ntua.gr/gbouck/downfiles/geot_earthquake_eng_Ch4-SITE-ADERS-10.pdfThere's just a small collection of dozens of sitesDave
 
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  • #3
dahoa said:
Is there any formula that can relate the two... like does stiff soil has the same frequency as short storey buildings when they shake??
For a specified seismic wave, the frequency spectrum of the vibration is the same, but the amplitude of oscillation is greater in slower rocks.

The foundations of small buildings do not need to be deep, so are often just the low velocity surface soil covered by a concrete slab. The foundations of tall buildings are dug well down below the low velocity weathered soil, onto deeper fast rock.

So small buildings tend to be shaken by greater amplitude waves than tall buildings. A tall building built on a low velocity rock, such as a volcanic tuff, will be shaken significantly more than if it were securely founded on a fast granite.
 
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Baluncore said:
For a specified seismic wave, the frequency spectrum of the vibration is the same, but the amplitude of oscillation is greater in slower rocks.

The foundations of small buildings do not need to be deep, so are often just the low velocity surface soil covered by a concrete slab. The foundations of tall buildings are dug well down below the low velocity weathered soil, onto deeper fast rock.

So small buildings tend to be shaken by greater amplitude waves than tall buildings. A tall building built on a low velocity rock, such as a volcanic tuff, will be shaken significantly more than if it were securely founded on a fast granite.
What physics principle why the amplitude of oscillation is greater in slower (you mean low velocity?) rock?
 
  • #5
Fundamentally it comes down to the energy density of the wave propagating through the material. At half the velocity of propagation, there is twice the energy present per unit length of the propagation path. That implies a higher amplitude.
 

1. What is soil-structure interaction?

Soil-structure interaction is the mutual interaction between a structure and the surrounding soil or ground. It is a crucial aspect in the design and analysis of any structure built on or in the ground, as the behavior of the soil and the structure can affect each other.

2. Why is soil-structure interaction important in engineering?

Soil-structure interaction is important in engineering because it can significantly affect the performance of a structure. The behavior of the soil can influence the stability, deformation, and overall structural response, while the structure's loads and movements can alter the properties of the soil.

3. What factors affect soil-structure interaction?

The factors that affect soil-structure interaction include the type and properties of the soil, the type and geometry of the structure, the loads and movements applied to the structure, and the boundary conditions of the soil-structure system.

4. How is soil-structure interaction analyzed?

Soil-structure interaction is typically analyzed through numerical methods such as finite element analysis, which simulates the behavior of the soil and structure under various loading and boundary conditions. Physical models, field tests, and analytical methods can also be used to study soil-structure interaction.

5. What are the implications of neglecting soil-structure interaction in engineering?

Neglecting soil-structure interaction in engineering can lead to inaccurate structural analysis and design, potentially resulting in structural failures or excessive costs. It is important to consider soil-structure interaction to ensure the safety and stability of a structure.

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