concrete beam

- December 16, 2019 at 6:14 pm
  
  ansys8
  Subscriber
  
  Hi everyone!
  
  I am trying to model a two concrete beams by applying a load and do the modal analysis and harmonic response
  
  i want my first beam to be undamaged, and the other beam is damaged by viewing the cracks
  
  1)in the undamaged beam i applied a nodal force in the center of the beam, two fixed supports, and i got a frequency of 538.62 hz(i used the concrete material in the library)
  
  2)in the damaged beam(same force,supports) i wanted to reduce the elasticity modulus and changing the stiffness in the middle of the beam, so i can get to see the cracks, and get a different frequency, but i couldn't do this, so i used solid65 element, and i got a frequency of 718 hz
  
  so i want to know if there is a way to play with the stiffness value in ansys, and how does solid65 work, how did the cracks appear? when i run the analysis are the assigned values for the concrete in the library will be used? because i noticed if i keep the material as a structural steel, it uses the values of the steel even through the command is there, is there a way which i can change the stiffness in the code? i tried to change some values but nothing has changed.
  
  thank you

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