Dear engineers,
I'm checking the calculation for anchor bolt base plate connection. My client has sent me this calculation generated by RAM Connection. But there is no formulas shown in it.
RAM Connection directly gives the value. Not the formula.
How MpM, MpN, Mstrip are calculated in RAM connection?
Can any one help in this issue.
Base plate
Flexural yielding (bearing interface) [KN*m/m] 38.67 51.30 1 - DC1 1.33
m = m = 155[mm]
n = n = 170[mm]
Mpl = max(MpM, MpN) = max(24.072219[KN*m/m], 51.297867[KN*m/m]) = 51.297867[KN*m/m] fMn = f*Fy*tp 2/4 = 0.9*0.275[KN/mm2]*25[mm]2/4 = 38.671875[KN*m/m] DG1 Eq. 3.3.13
Flexural yielding (tension interface) [KN*m/m] 38.67 12.08 1 - DC1 0.31
DG1 Sec 3.1.2 DG1 Sec 3.1.2
DG1 Eq. 3.3.13
MpT = Mstrip/Beff = 5.314693[KN*m]/440[mm] = 12.078848[KN*m/m] fMn = f*Fy*tp 2/4 = 0.9*0.275[KN/mm2]*25[mm]2/4 = 38.671875[KN*m/m] DG1 Eq. 3.3.13
MpM: Plate bending moment per unit width at bearing interface for the cantilever m MpN: Plate bending moment per unit width at bearing interface for the cantilever n Mstrip: Maximum bending moment at the strip
The design procedure for base plate design in RAM Connection is based on AISC Design Guide 1. The Design Guide includes some design examples that will clarify how these parameters are calculated.
The equations used to calculate the plate bending moment in the "Flexural Yielding (Bearing Interface)" check are discussed in Section 3.3.2 of the Design Guide.
The strip moment in the "Flexural Yielding (Tension Interface)" check is calculated assuming the tensile loads in the anchors generate one-way bending in the base plate about assumed bending lines. The location of the bending lines depends on whether the placement of the anchors. See Figure 3.1.1(b) and Figure 4.5.2 in the Design Guide. The program assumes a 45 degree load distribution from the anchor to the yield line to determine the width of the bending strip.
Please use the "Secure File Upload" link on the right hand side to upload your model. I will show the calculations for you.
Dear kjgullerud ,
Only report is woth me. not model. I have uploaded the output in "Secure File Upload"
The formula not found for
MpM: Plate bending moment per unit width at bearing interface for the cantilever m
MpN: Plate bending moment per unit width at bearing interface for the cantilever n
Mstrip: Maximum bending moment at the strip
weld Moment of Inertia (I)
Different values used for L shear in major axis and minor axis analysis.(Elastic method weld shear capacity)
-Vivek
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Answer Verified By: F_Diego