TECHNICAL
AUTHOR:
Jaakko Soivio
B.Sc.
R&D Engineer
Peikko Group Corporation
DELTABEAM® FRAME
The DELTABEAM® Frame is a steel concrete composite frame solution
which consists of DELTABEAM® Composite Beams, Composite Columns,
and connections between the structural members. Most often other
steel structures such as bracing systems are included in the delivery.
Although the design process is utilizing a standardized selection of
components, each structural member and connection detail of the
DELTABEAM® Frame is tailored to suit the project in question.
BEAM TO COLUMN JOINTS
The flexibility and precision of the prefabricated steel components of
the DELTABEAM® Frame allows for freedom in the architectural design.
The variety of the shapes of frames sets high requirements for the joints
between the structural members. The joints must not only fulfill the
requirements of different design stages, but also be safe and easy to
install.
The most common beam to column connection is nominally pinned.
The definitive property of a beam to column connection varies from the
construction stage to another, and from loading situation to another. From
the load transfer point of view, the torsion resistance is a typically desired
property in the construction stage, robustness in the accidental situation,
and delayed temperature development in the fire situation respectively.
For the normal stage, the design is principally defined by the vertical shear
initiated by the support reaction from the beam. The vertical actions along
a continuous column are transferred from the beam to the column by a
variety of corbel arrangements. The load transfer to the composite section
of the column is depending on the type of the corbel and possible shear
devices.
EUROCODES AND LITERATURE
According to Eurocodes 1 in the regions of load introduction a clear load
path should be defined. The amount of slip required to reach the defined
load transfer should not be in contradiction with the design assumptions.
In the case where the load is at first introduced to the steel section and
then further to the composite section, the shear stresses should be
evaluated from the sectional forces by elastic or plastic analysis. FIGURE 1 TYPICAL SECTION OF A DELTABEAM® FRAME
38 PEIKKO CONNECTIONS 1/2021