The cnxn package is designed to assist in the analysis of simple bolted connections. A simple bolt connection transfers tension and shear from one component to another through bolts. This program is limited to bolt analysis. It does not currently consider the member capacity in the vacinity of the connection including but not limited to bearing, excessive deformation, block shear rupture, yielding of the gross cross-section, and fracture of the net cross-section.
A simple bolt connection is not a partial moment connection (PMC) or a full moment connection (FMC). Those connections require a different analysis not covered by this program.
The initial goal of this program is to develop the demand functionality. The next priority would be the capacity followed by the analysis and finally the design.
user input
bolt
- bolt num
- x-coord
- y-coord
- diameter
force
- x-coord
- y-coord
- z-coord
- px
- py
- pz
analysis type
- shear
- tension?
- ecc_in_plane_elastic
- ecc_in_plane_plastic
- ecc_out_plane_find_na
- ecc_out_plane_na
- ecc_out_plane_init_ten
Assumptions
- it is up to the user to determine the x and y coordinates of their origin and stick to it
- the x and y axes are parallel to the faying surface. x is positive to the right and y is positive up.
- the z-axis is perpendicular to the faying surface. z is positive by the right hand rule or pointing out of the page
- bolt direction is taken as the axis parallel to the longitudinal axis of the bolt
- all bolts are perpendicular to the faying surface, i.e. the bolts are parallel to the z-axis
- the faying surface is the origin of the z-axis
- only one faying surface is allowed
- The force given to the program should have the magnitude and direction associated with the program positive coordinate system.
- The reactions on the bolts are the forces required at the bolt locations to resist the applied force.