ID of a CURVE or FUNCTION defining bolt shaft stress versus time
$sf$
Shaft stress curve scale factor
default: 1
$t_{beg}$
Start time
$t_{end}$
End time
default: 1.0e20
Description
This command is used to prestress a set of bolts and to apply balancing forces to the surface
of the holes in which the bolts are attached.
pid${}_{bolt}$ is assumed to contain one or several bolts. pid${}_{plate}$ must have holes
matching the bolts.
The command identifies the discrete bolts and holes and creates bolt-hole pairs.
The bolt shafts are prestressed with the axial stress defined by curve cid.
Example
Prestress blind hole boltBolted connection
The following commands define an axial bolt shaft stress of 100MPa. The bolt is in part 3 and the threaded
base plate in part 1.
The applied shaft stress ramps up from 0 to 100MPa and is then held constant.
The OUTPUT command is defined to output state files for the complete model at termination.
These state file are to be included in the next modeling stage, where the bolt is merged to the hole in
the base plate:
#
# Step 2 - inlcude state from Step 1
#
*UNIT_SYSTEM
MMTONS
#
# elements, nodes and final state after Step 1
*INCLUDE
../prestress/impetus_state1.k
#
# file with *MERGE command, locking the bolt to base plate
*INCLUDE
../prestress/impetus_state_bolt1.k
impetus_state_boltX.k contains a MERGE command that locks bolt to the hole:
Each bolt hole pair has its own MERGE definition. As a consequence merge.out
will have one force history curve for each connection.
Bolted connection under shear load
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