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Can a crisscrossed metallic skeleton resist earthquakes for buildings?

Can a horizontal foundation safeguard against earthquakes?Foiling vortex traps around buildingsWater distribution - sizing weir buildingsDo we need to use cracked section in Fundamental period calculation for a building?Why aren't Steel Prefab Buildings common for residential use?Why conduct experiment for load distribution within three triangulated structural frameworks when you can calculate theoreticallyPlace a greenhouse: how to orient it for the best effect?What are the limits on building very high buildings using certain materials and architectural style?Effectiveness of positive pressure in highrise buildings?How buildings 3D model is createdCan a horizontal foundation safeguard against earthquakes?

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2

$begingroup$

To follow up with my previous question on the seismic design of buildings, I would like to ask if it makes sense to support buildings with strong thick 'crisscrossed' metallic frames.

I have the impression that an 'X-structured design' provides good structural integrity, as commonly seen in construction sites. Would it be wise to construct buildings out of a metallic 'skeleton' that is formed throughout by intersecting the diagonals of squares?

structural-engineering civil-engineering structural-analysis building-design building-physics

share|improve this question

asked 9 hours ago

Chong Lip PhangChong Lip Phang

12755 bronze badges

$endgroup$

add a comment | 

2

$begingroup$

To follow up with my previous question on the seismic design of buildings, I would like to ask if it makes sense to support buildings with strong thick 'crisscrossed' metallic frames.

I have the impression that an 'X-structured design' provides good structural integrity, as commonly seen in construction sites. Would it be wise to construct buildings out of a metallic 'skeleton' that is formed throughout by intersecting the diagonals of squares?

structural-engineering civil-engineering structural-analysis building-design building-physics

share|improve this question

asked 9 hours ago

Chong Lip PhangChong Lip Phang

12755 bronze badges

$endgroup$

add a comment | 

$begingroup$

To follow up with my previous question on the seismic design of buildings, I would like to ask if it makes sense to support buildings with strong thick 'crisscrossed' metallic frames.

I have the impression that an 'X-structured design' provides good structural integrity, as commonly seen in construction sites. Would it be wise to construct buildings out of a metallic 'skeleton' that is formed throughout by intersecting the diagonals of squares?

structural-engineering civil-engineering structural-analysis building-design building-physics

share|improve this question

asked 9 hours ago

Chong Lip PhangChong Lip Phang

12755 bronze badges

$endgroup$

share|improve this question

asked 9 hours ago

Chong Lip PhangChong Lip Phang

12755 bronze badges

share|improve this question

asked 9 hours ago

Chong Lip PhangChong Lip Phang

12755 bronze badges

asked 9 hours ago

Chong Lip PhangChong Lip Phang

12755 bronze badges

asked 9 hours ago

Chong Lip PhangChong Lip Phang

12755 bronze badges

2 Answers
2

active

oldest

votes

1

$begingroup$

earth quake is basically random vibration of the earth in several different ways, S wave, P wave etc. which is a complex and different subject.

X bracing is a way of making the structure stiff, so in short buildings combined with other measures is mostly an effective method.

But in high risers and tall building the critical thing is to mitigate the huge shears that X bracing imparts on the foundation and also make sure the building structure vibration caused the earth quake does not resonate with the vibration of site.

So in tall buildings the strategy is to design the building for earth quake and wind fluttering in a way that the natural frequency of the building is not close to the frequency of earthquake or wind turbulence.

That is why in tall buildings they sometimes use moment frame as opposed to X bracing. These are classified as passive methods.

In some critical structures they insulate the building from the foundation by using rollers and shock absorbers.

Or in some new projects the have active smart earthquake resisting computer controlled hydraulic jacks and braces, which make the building sway, opposing and breaking the impulse of the earthquake.

share|improve this answer

answered 7 hours ago

kamrankamran

6,06522 gold badges55 silver badges1313 bronze badges

$endgroup$

add a comment | 

2

$begingroup$

This is indeed commonly done to perform earthquake structural retrofits on buildings which do not meet current code and which are too valuable to tear down and completely replace. It is also common to insertut huge shock absorbers into the X-bracing structure to dissipate the earthquake energy.

share|improve this answer

answered 8 hours ago

niels nielsenniels nielsen

4,11511 gold badge22 silver badges1414 bronze badges

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  So has the problem of earthquakes been completely solved today? Was it solved only recently?
  $endgroup$
  – Chong Lip Phang
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  this is a problem which can only be solved by successively revising the building codes based on actual earthquake experience. The Japanese are the world leaders in this science.
  $endgroup$
  – niels nielsen
  4 hours ago
  

  
  
  
  

add a comment | 

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1

$begingroup$

earth quake is basically random vibration of the earth in several different ways, S wave, P wave etc. which is a complex and different subject.

X bracing is a way of making the structure stiff, so in short buildings combined with other measures is mostly an effective method.

But in high risers and tall building the critical thing is to mitigate the huge shears that X bracing imparts on the foundation and also make sure the building structure vibration caused the earth quake does not resonate with the vibration of site.

So in tall buildings the strategy is to design the building for earth quake and wind fluttering in a way that the natural frequency of the building is not close to the frequency of earthquake or wind turbulence.

That is why in tall buildings they sometimes use moment frame as opposed to X bracing. These are classified as passive methods.

In some critical structures they insulate the building from the foundation by using rollers and shock absorbers.

Or in some new projects the have active smart earthquake resisting computer controlled hydraulic jacks and braces, which make the building sway, opposing and breaking the impulse of the earthquake.

share|improve this answer

answered 7 hours ago

kamrankamran

6,06522 gold badges55 silver badges1313 bronze badges

$endgroup$

add a comment | 

1

$begingroup$

earth quake is basically random vibration of the earth in several different ways, S wave, P wave etc. which is a complex and different subject.

X bracing is a way of making the structure stiff, so in short buildings combined with other measures is mostly an effective method.

But in high risers and tall building the critical thing is to mitigate the huge shears that X bracing imparts on the foundation and also make sure the building structure vibration caused the earth quake does not resonate with the vibration of site.

So in tall buildings the strategy is to design the building for earth quake and wind fluttering in a way that the natural frequency of the building is not close to the frequency of earthquake or wind turbulence.

That is why in tall buildings they sometimes use moment frame as opposed to X bracing. These are classified as passive methods.

In some critical structures they insulate the building from the foundation by using rollers and shock absorbers.

Or in some new projects the have active smart earthquake resisting computer controlled hydraulic jacks and braces, which make the building sway, opposing and breaking the impulse of the earthquake.

share|improve this answer

answered 7 hours ago

kamrankamran

6,06522 gold badges55 silver badges1313 bronze badges

$endgroup$

add a comment | 

$begingroup$

earth quake is basically random vibration of the earth in several different ways, S wave, P wave etc. which is a complex and different subject.

X bracing is a way of making the structure stiff, so in short buildings combined with other measures is mostly an effective method.

But in high risers and tall building the critical thing is to mitigate the huge shears that X bracing imparts on the foundation and also make sure the building structure vibration caused the earth quake does not resonate with the vibration of site.

So in tall buildings the strategy is to design the building for earth quake and wind fluttering in a way that the natural frequency of the building is not close to the frequency of earthquake or wind turbulence.

That is why in tall buildings they sometimes use moment frame as opposed to X bracing. These are classified as passive methods.

In some critical structures they insulate the building from the foundation by using rollers and shock absorbers.

Or in some new projects the have active smart earthquake resisting computer controlled hydraulic jacks and braces, which make the building sway, opposing and breaking the impulse of the earthquake.

share|improve this answer

answered 7 hours ago

kamrankamran

6,06522 gold badges55 silver badges1313 bronze badges

$endgroup$

share|improve this answer

answered 7 hours ago

kamrankamran

6,06522 gold badges55 silver badges1313 bronze badges

answered 7 hours ago

kamrankamran

6,06522 gold badges55 silver badges1313 bronze badges

answered 7 hours ago

kamrankamran

6,06522 gold badges55 silver badges1313 bronze badges

2

$begingroup$

This is indeed commonly done to perform earthquake structural retrofits on buildings which do not meet current code and which are too valuable to tear down and completely replace. It is also common to insertut huge shock absorbers into the X-bracing structure to dissipate the earthquake energy.

share|improve this answer

answered 8 hours ago

niels nielsenniels nielsen

4,11511 gold badge22 silver badges1414 bronze badges

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  So has the problem of earthquakes been completely solved today? Was it solved only recently?
  $endgroup$
  – Chong Lip Phang
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  this is a problem which can only be solved by successively revising the building codes based on actual earthquake experience. The Japanese are the world leaders in this science.
  $endgroup$
  – niels nielsen
  4 hours ago
  

  
  
  
  

add a comment | 

2

$begingroup$

This is indeed commonly done to perform earthquake structural retrofits on buildings which do not meet current code and which are too valuable to tear down and completely replace. It is also common to insertut huge shock absorbers into the X-bracing structure to dissipate the earthquake energy.

share|improve this answer

answered 8 hours ago

niels nielsenniels nielsen

4,11511 gold badge22 silver badges1414 bronze badges

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  So has the problem of earthquakes been completely solved today? Was it solved only recently?
  $endgroup$
  – Chong Lip Phang
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  this is a problem which can only be solved by successively revising the building codes based on actual earthquake experience. The Japanese are the world leaders in this science.
  $endgroup$
  – niels nielsen
  4 hours ago
  

  
  
  
  

add a comment | 

$begingroup$

This is indeed commonly done to perform earthquake structural retrofits on buildings which do not meet current code and which are too valuable to tear down and completely replace. It is also common to insertut huge shock absorbers into the X-bracing structure to dissipate the earthquake energy.

share|improve this answer

answered 8 hours ago

niels nielsenniels nielsen

4,11511 gold badge22 silver badges1414 bronze badges

$endgroup$

share|improve this answer

answered 8 hours ago

niels nielsenniels nielsen

4,11511 gold badge22 silver badges1414 bronze badges

answered 8 hours ago

niels nielsenniels nielsen

4,11511 gold badge22 silver badges1414 bronze badges

answered 8 hours ago

niels nielsenniels nielsen

4,11511 gold badge22 silver badges1414 bronze badges