Using springs to measure twisting of foundations
Using springs to measure twisting of foundations
(OP)
hi,
I am trying to model how a 3D foundation for a bridge twists under loading. It is prevented from displacing in the vertical direction, but can twist in the other direction. I initially tried to put 4 springs in at the four corners of the end face of the foundation. In this way, one end of the foundation could displace more if it had a greater force. However, I cant get this to work. I am doing an explicit analysis and I am having trouble connecting the other end of the spring to a fixed point in the part. I was able to use a reference point for this, but I can only seem to create one per reference point per part, and I need four reference points. Anyone have any suggestions on how I can model this?
I am trying to model how a 3D foundation for a bridge twists under loading. It is prevented from displacing in the vertical direction, but can twist in the other direction. I initially tried to put 4 springs in at the four corners of the end face of the foundation. In this way, one end of the foundation could displace more if it had a greater force. However, I cant get this to work. I am doing an explicit analysis and I am having trouble connecting the other end of the spring to a fixed point in the part. I was able to use a reference point for this, but I can only seem to create one per reference point per part, and I need four reference points. Anyone have any suggestions on how I can model this?





RE: Using springs to measure twisting of foundations
If not, just use connectors with spring behavior, or the *spring option (maybe the spring is only for standard, idk)
RE: Using springs to measure twisting of foundations
Yeah I have tried to use the connectors now, they seem much easier. However, it asks me for a D value, when I choose elastic behaviour for the connector. I have checked through the manual, but I dont know what D is. I was expecting a stiffness (E) value instead. Do you know anything about this?
RE: Using springs to measure twisting of foundations
Data lines to define linear uncoupled elastic behavior (the COMPONENT parameter is included and the NONLINEAR parameter is omitted):
First line:
Elastic stiffness (force or moment per relative displacement or rotation; force for SLIPRING).
see:
31.2.2 Connector elastic behavior
the D (21 value matrix) is for coupled unsymmetric linear stiffness, which you probably don't need.
RE: Using springs to measure twisting of foundations
RE: Using springs to measure twisting of foundations
Are you sure you don't want e.g. a cartesian connector (with 3 stiffness values for each of the 3 directions)?
Also check your units for consistency.
Other than that, we will need more info (e.g. an input file)
RE: Using springs to measure twisting of foundations
RE: Using springs to measure twisting of foundations
And D11 is a stiffness value, abaqus is unitless so I don't know if 1 is low or not.
RE: Using springs to measure twisting of foundations