Including Change 2, August 2006
Due to the relatively high lateral drift allowances for pre-engineered
structures in the MBMA specifications, the use of masonry veneers and masonry
exterior enclosures must be avoided for metal building systems unless the structural
engineer-of-record demonstrates by a relative stiffness analysis that the building
displacements and veneer backing displacements will not damage the masonry.
Design and construction of masonry veneers must comply with the requirements of UFC
1-200-01 and ACI 530.
Metal building systems must not be attached to existing structures unless
the transfer of lateral loads into the existing structures has been accounted for in
modifications to the existing structural system.
Where additions or interior modifications are to be made to an existing
metal building, the new construction must be separated from the existing structure, so
that no new loads are applied to the existing framing, unless the metal building was
designed for the additional loads, or the Structural Engineer determines by calculation
that the existing structure can safely support the superimposed loads.
Delegate-Engineered Systems or Component Parts.
The engineer of record for a structure may delegate responsibility for the
design of the following systems or component parts of the structure to a qualified
delegated engineer. Both the engineer of record for the structure and the delegated
engineer must comply with the requirements of this UFC.
a. Prefabricated wood components
b. Cast-in-place post-tensioned concrete structural systems
c. Precast, prestressed concrete components
d. Open web steel joists and joist girders
e. Pre-engineered metal buildings
f. Foundation systems
g. Structural steel connections
h. Cold-formed steel joist/stud/truss framing and pre-fabricated components
i. Seismic anchorage of equipment
Proprietary track for under-hung cranes and monorails