What is seismic restraint?
Seismic restraint is reinforcement that is designed to prevent earthquakes from damaging an object.
Are seismic restraints required?
Seismic restraints are not required or need not be “designed” for the following: * MEP components if: The seismic design category is either A or B. The seismic design category is C and the component importance factor (IP) is 1.0.
Where is seismic bracing required?
Conduits, including HVAC ductwork, piping, and electrical conduits and raceways, may also require seismic bracing. ASCE 7 says that: HVAC ductwork needs bracing when the duct has a cross-section 6 ft. or larger or when it weighs more than 17 pounds per linear foot, or when it has an Ip=1.5.
What are seismic brackets?
Seismic Bracing Anchors and Brackets. Angle Iron Mount. Beam Mount. These OSHPD approved anchors and brackets support threaded-rod-mount hangers during seismic activity. A complete seismic bracing system consists of an upper bracket, a lower bracket, and strut or pipe (sold separately).
Is seismic bracing required for Category B?
Per ASCE 7-02, mechanical and electrical components in Seismic Design Category B are exempt from seismic bracing requirements. You wouldn’t need to do anything for seismic. (Systems in Seismic Design Category C would need seismic restraint for systems with and “Importance Factor (IP)” greater than 1.0.
What is a rod stiffener?
Rod Stiffeners. Secure strut channel to vertical hangers with rod stiffeners to prevent buckling during a seismic event. Eaton TOLCO rod stiffeners feature a break-off bolt head, which helps reduce inspection time by allowing a visual verification of the proper torque and installation.
What does seismic category C mean?
Seismic Design Category C – Corresponds to buildings of Occupancy Groups IV ( Hospitals, Police Stations Emergency control centers etc) I where expected ground shaking will be MODERATE AND buildings of occupancy categories I, II, and III where MORE SEVERE ground shaking will occur.
What are stiffeners?
Stiffeners are secondary plates or sections which are attached to beam webs or flanges to stiffen them against out of plane deformations. Almost all main bridge beams will have stiffeners.
Where do I put stiffener?
Stiffeners can be attached on one side of the plate (single sided), or on both sides (double sided). Usually bearing stiffeners are double sided, while intermediate web stiffeners are single sided.
What is tie beam?
What Is a Tie Beam? As a building gets taller, the columns would start leaning if they were not given some structure. That is the role of the tie beam. It’s any primary beam that connects — or ties together — two columns anywhere above the floor level to keep them from buckling.
How do you calculate stiffener?
A simple way to determine the stiffener’s share of the axial force is to calculate the stress at its centroid, taking into account eccentricity of axial force on the effective section, and then multiply this stress by the stiffener area.
What is the difference between column and stiffener?
Stiffeners are utilized as a method for offering additional support to columns at beam connections. They are included when the strength of the column is surpassed; however, full moment strength of the beam section is desired.
What are the 2 types of loads?
The loads in buildings and structures can be classified as vertical loads, horizontal loads and longitudinal loads. The vertical loads consist of dead load, live load and impact load. The horizontal loads consist of wind load and earthquake load.
What are the types of stiffeners?
There are two principal types of stiffener:
- Longitudinal web stiffeners, which are aligned in the span direction.
- Transverse stiffeners, which are aligned normal to the span direction of the beam.
What is a seismic restraint component?
–The component is required to function for life- safety purposes after an earthquake, including fire protection sprinkler systems (sprinkler systems are not covered in SMACNA’s seismic restraint manual) –The component contains hazardous materials
How many parts are in the SMACNA seismic restraint manual?
The SMACNA Seismic Restraint Manual Contains 12 Different Details for Connecting to Ductwork, Rectangular and Round FIGURE 4-2 SIDE BRACING FOR RECTANGULAR DUCTS
Is the seismic restraint manual 2006 compliant with ASCE 7?
Code Changes The third edition of the Seismic Restraint Manual was written to be compliant with IBC 2006 and ASCE 7-05. –The CBC 20071614A.1.14 ASCE 7 Section 13.6.7.
Are seismic supports required for piping systems?
Seismic supports are not required for piping systems where one of the following conditions is met: 1. Piping is supported by rod hangers; hangers in the pipe run are 12 in. (305 mm) or less in length from the top of the pipe to the supporting structure;