RIGID ROCKING WALL SIMULATION: HOW TO IMPROVE RESULT

- May 6, 2022 at 6:41 am
  
  umad
  Subscriber
  
  Hello everyone.
  I am doing simulation of Rigid body analysis of masonry wall in LS DYNA and needs help on how to improve the numerical simulation.
  Wall dimensions: Height of the wall is 4.1m, Length is 1.15m, thickness is 0.35m. During the experiment, the crack height from the base of the wall is 2.501 m. i.e height of bottom wall is 2.501 m and height of top wall is 1.599
  Contact Automatic Surface to Surface was used in a between the two walls interface and between the floor and bottom wall interface. Friction coefficient of 0.7 was used.
  Contact Automatic Surface to Surface was used in a between the top wall and top support. Zero friction was used here.
  Uniformly distributed load was assigned on the wall face.
  Material model: Top support and Floor (MAT_001) and assigned to Young modulus Elasticity of 40000 MPa
  Two block walls (MAT_020) and assigned to masonry Young modulus of 4758 MPa
  Numerical result is not matching with the hand calculation (Rigid body Analysis)
- May 10, 2022 at 10:54 am
  
  peteroznewman
  Subscriber
  
  Did your hand calculation include inertia forces or was it a statics analysis?
- May 10, 2022 at 8:48 pm
  
  umad
  Subscriber
  
  My hand calculation did not include inertia forces. It was only a static analysis.
- May 10, 2022 at 11:30 pm
  
  peteroznewman
  Subscriber
  
  As the velocity of the wall increases, less force is needed to increase the displacement.
  Can you update your hand calculation to include the effect of the velocity?