Vibro-Acoustics_bySwegon_White
Vibro-Acoustics_bySwegon_White

Tanks (such as expansion tanks) often do not have allocated mounting "feet" for extreme event applications. Vibro-Acoustics' seismic mounting brackets should be utilized at three to four locations around the base. Depending on the tank location and size, wall straps and custom tank cages could be required.

PDFRegular Details
PDFSeismic Details

Vibro-Acoustics’ Seismic Equipment Restraint Brackets are a series of standardized steel brackets formed to match most equipment base support frames and pre-drilled to facilitate securing floor-mounted equipment against seismic forces.

The brackets are designed for a wide range of seismic forces and include rubber grommet washers as appropriate to minimize shock forces at anchor locations – helping to ensure that the tank not only stays in place during and after an extreme event but also remains operational.

The neoprene grommets also help minimize vibration transmission through the brackets which are commonly used in conjunction with Neo+ neoprene pad isolators.

Design Considerations

Seismic Requirements

Problem: Horizontal and vertical forces applied at the center-of-gravity of the unit require proper design of the attachment of the unit and/or vibration isolators to the structure.

Solution: Restrained springs must be used.

Problem: Forces are determined by a number of factors including: project location, site class, risk category, component importance factor and equipment location equipment relative to the overall height of the building.

Solution: Certified anchorage calculations must be submitted to verify loading conditions are met for each piece of equipment.

Problem:The complete load path must be followed.

Solution: Often overlooked is the proper reinforcement and doweling in of the housekeeping pad to the structural slab.

Problem: Poor installation of concrete anchors.

Solution: IBC 2015 requires ICC-ES approved anchors for cracked concrete and Omega Naught Factor (Horizontal forces multiplied by 2.5).

Problem: Differential motion up to 2” in a 20’ story height.

Solution: Flexible connectors are required to reduce equipment nozzle loads.

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