What is seismic bracing?
What is seismic bracing?
The core purpose of seismic bracing is to restrict horizontal shaking from an earthquake. All seismic braces firmly attach equipment to structural members of a building so that they move with the structure during an earthquake.
Why is seismic bracing used?
Seismic Sway Braces Sway braces are the most important efficient means of keeping suspended equipment, electrical conduits, piping, and duct work in place and to keep them from swaying during earthquakes or bomb blasts. Braces are attached to the pipe/duct at horizontal supports such as clevis’s or trapezes.
What are seismic restraints?
Seismic restraint is the positive attachment of components to the building structure to resist primarily horizontal forces due to an earthquake.
Where are seismic restraints required?
(Restraints are required on equipment that is hung 12-in. or less from the ceiling because equipment behaves more erratically than piping or duct during a seismic event.)
What are seismic design categories?
What is a Seismic Design Category. If A Seismic Design Category is a classification assigned to a structure based on it’s occupancy category, and the severity of the design earthquake ground motion.
What does seismic retrofitting entail?
Seismic retrofitting is the modification of existing structures to make them more resistant to seismic activity, ground motion, or soil failure due to earthquakes.
What is sway bracing in steel structure?
In case of steel structure to resist the lateral force and increase the stiffness of steel frame, bracings play very vital role. Bracing will make structure indeterminate. But it stiffens the structure and also helps to resist the sway of the structure. Bracings are straight member and carry only axial forces.
When was cross bracing first used?
X-bracing is a structural engineering practice where the lateral load on a building is reduced by transferring the load into the exterior columns. X-bracing was used in the construction of the 1908 Singer Building, then the tallest building in the world.
What is seismic design category B?
If A Seismic Design Category is a classification assigned to a structure based on it’s occupancy category, and the severity of the design earthquake ground motion. Seismic Design Category B – Corresponds to buildings of Occupancy Groups I,II and III where expected ground shaking will be moderate.
Are seismic restraints required?
Seismic restraints are not required or need not be “designed” for the following: The seismic design category is either A or B. The seismic design category is C and the component importance factor (IP) is 1.0. and its failure cannot impact the performance of an importance factor 1.5 component.
