Butt Plate Connections

It consists of 3 different types.
The factors determining the behavior of the combination; beam cross-section reaching to flow under bending effect, frontal plate reaching to flow under bending effect, flowing of column panel area, breaking of bolts under tensile effect, breaking bolts under shear effect.
The controls listed above are applied automatically and detailed explanations and references and parameters used in the account are given in the report.
The YDKT method must be selected to report these combinations used in the connection of moment transfer frame elements carrying earthquake loads together with TBDY 2018 and ÇYTHE 2018.

There are conditions that must be met in order to be used in 3 types of frames with high ductility level or limited moment transfer. These conditions are given in TBDY 2018 Table 9B.1 according to the ductility level. ideCAD Statik automatically checks and reports these conditions.
Plastic hinges cause inelastic bending deformations in the joining beam and column panel area in the joints with butt plate. Therefore, strong column, strong joint and weak beam design are considered as philosophy. For this reason, the length of the plastic hinge and its distance from the column face are especially checked in the table below.

The strength of the frontal plate joint is determined by the assumption that the tensile force of the bolts in one head is controlled by the crushing limit state under the pressure force in the other.
If there is no axial load on the joint, the total tensile and compressive forces are equal and opposite in both heads, so that the total force creates a force pair.
The row of bolts farthest from the pressure head is considered as the region subject to the greatest tensile force, and while the inverse triangular force distribution is considered for ease of calculation, and a ductile joint is calculated on a parabolic distribution according to the plastic force distribution assumption.
The bending strength of the frontal plate and column head is determined by yield line analysis. The flow line method can be calculated by the energy or virtual work method.

Strong column, strong joint and weak beam are used to calculate the forces on the bolt and to find the required bolt strength. According to this assumption, while the column, panel region and beam exhibit inelastic behavior, the joint and column show elastic behavior. For this reason, it is necessary to design suitable for the thick plate for the frontal plate. In thick plate behavior, the force in the bolts is the static moment at the center of the pressure head.
- The equations used are as follows: