What is the right calculation method now? According to VDI 2230-2, bolt loads FAo and FAu are calculated like bearing pressure on supports of a hinge-mounted beam. There is even a possibility to get the same result: set flange diameter de=0, and you get equal results for Dose and VDI 2230-2 calculation. In the input window for the flange data, you can now switch between the two calculation methods to see how it influences the results. It can be configured at 'Edit-Calculation Method' or at 'Edit->Flange'. Now we have added this formula (43) from VDI 2230-2 in SR1+ as alternative calculation method.

VDI 2230-2 provides another approximation equation:įA,max = Mz/(ns*dt) * (FB*dt/Mz + 4) (43)Īmount of bending moment according to this formula (FB=0): However, according to Dose formulas, point 0 is the outside diameter of the flange. But it seems that the x coordinates are referenced to the flange center. This formula seems to be equal with the formula according to Dose used in SR1+. Calculation of axial load FA on the most stressed bolted joint from a bending moment on the flange is described in chapter 6.3.2.3, formula (34): Dose formulas are described in auxiliary image SR1E-105.Ĭircular flange with multi-bolted joints is described in chapter 6.3.2 of VDI 2230-2. Now we can compare if calculation according to new VDI2230-2 is identical with the calculation according to Dose used in SR1+ since 1999. SR1+ provides calculation of the mostly used multi-bolted joint, a circular flange, since 1999. It describes how to calculate the load of the mostly stressed bolted joint from multi-bolted joints. VDI released in November 2011 a new draft standard VDI 2230-2 for multi-bolted joints.

Vdi 2230 part 2