Seismic Code Highlights Determining what level of Seismic Restraints are Required

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Seismic Code HighlightsDetermining what level of
Seismic Restraints are Required

• Arkansas Fire Prevention Code 2002
• Based on the IBC 2000

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Arkansas Seismic Code(Determining what level of
Seismic Restraint is Required)

• Need to determine the following
• Seismic Use Group (Section 1616.2)
• A classification assigned to a building based on
  its use as defined in Section 1616.2
• Site Class (Table 1615.1.1)
• A classification assigned to a site based on the
  types of soils present and their engineering
  properties as defined in Section 1615.1.5
• Spectral Response Acceleration (Figure 1615)
• Seismic Design Category (Section 1616.3)
• A classification assigned to a structure based on
  its Seismic Use Group and the severity of the
  design earthquake ground motion at the site.

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Seismic Use Groups

• Seismic Use Group III structures having
  essential facilities which are required for post
  earthquake recovery and those substantial
  quantities of hazardous substances (Table 1604.5)
• Seismic Use Group II structures the failure of
  which would result in a substantial public hazard
  due to occupancy or use as indicated by Table
  1604.5, or as designated by the building official
• Seismic Use Group I structures not assigned to
  either Seismic Use Group II or III

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Table 1604.5
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Site Class
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Spectral Response Acceleration

• Can be determined from Maps in Figure 1615 for
  Site Class B.
• For Site Class other than B the spectral response
  acceleration will have to be adjusted in
  accordance with Table 1615.1.2

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Spectral Response Acceleration
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Spectral Response Acceleration
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Spectral Response Acceleration
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Seismic Design Category

• Based on Seismic Use Group and design spectral
  response acceleration
• Determined from Table 1616.3(1) or Table 1616.3(2)

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Seismic Design Category
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Arkansas Seismic Code(Determining what level of
Seismic Restraint is Required)

• Best way to get the seismic information of a
  Building.
• Look on the Structural Plans or ask the
  Structural Engineer

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Seismic Restraint of HVAC Components

• HVAC Components have the same Seismic Design
  Category unless otherwise noted in the Code.
• All HVAC components must be Seismically
  Restrained Except

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Seismic Restraint of HVAC Components

• Exceptions (Section 1621.1.1)
• Components in Seismic Design Category A
• Mechanical components in Seismic Design Category
  B
• Mechanical components in Seismic Design Category
  C when the component importance factor (Ip) is
  equal to 1.0
• Mechanical components in all Seismic Design
  Categories, where Ip 1.0 and flexible
  connections between components and associated
  ductwork, piping, and conduit are provided, that
  are mounted at 4 feet or less above the floor
  level and weigh 400 lbs or less, and are not
  critical to the continued operation of the
  structure.
• Mechanical components in Seismic Categories D, E,
  or F that weigh 20 lbs or less, where the Ip1.0
  and flexible connections between the components
  and associated ductwork, piping, and conduits are
  provided.

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Arkansas Seismic Code(Determining what level of
Seismic Restraint is Required)

• Component Importance Factors (Section 1621.1.6)
• Ip1.5
• Life Safety Component is required to function
  after an earthquake
• Component contains hazardous or flammable
  material in quantities that exceed the maximum
  allowable quantities for an open system listed in
  chapter 4.
• Storage racks in occupancies open to the general
  public
• Structures in seismic use group III components
  needed for continued operation of the facility or
  whose failure could impair the continued
  operation of the facility
• Ip1.0
• All other components

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Arkansas Seismic Code(Determining what level of
Seismic Restraint is Required)

• Typical Rules of Thumb
• Buildings in Seismic Design Category A or B and
  in either Seismic Use Group I or II do not need
  seismic restraints
• If the Building is in User Group III almost
  everything will need to have seismic restraints

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Questions