Concrete021dMat

Purpose

uniaxial Kent-Scott-Park concrete material object with degraded linear unloading/reloading

Synopsis

MatResp = Concrete021dMat (action,MatNo,MatData,MatState)

Description

Concrete021dMAT uniaxial Kent-Scott-Park concrete material object with degraded linear unloading/reloading 
stiffness according to the work of Mohd Hisham Mohd Yassin and linear tension softening. 
A translation of the OpenSees model Concrete02.
  MATRESP = Concrete021dMAT (ACTION,MAT_NO,MATDATA,MATSTATE)
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  the character variable ACTION should have one of the following values
  ACTION = 'chec' function checks material property data for omissions and returns default values in MATDATA
           'init' function returns the material history variables in MATSTATE
           'forc' function returns the material stress (tensor) in MATSTATE
           'stif' function returns the material tangent modulus and the stress (tensor) in MATSTATE
           'post' function returns data structure MATPOST with post-processing information
  depending on the value of character variable ACTION the function returns information in data structure MATRESP
  for the material with number MAT_NO; data structure MATDATA supplies the material property data
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  data structure MATRESP stands for one of the following data objects depending on value of ACTION
  MATRESP = MATDATA   for action = 'chec'
  MATRESP = MATSTATE  for action = 'hist'
  MATRESP = MATSTATE  for action = 'stif'
  MATRESP = MATSTATE  for action = 'forc'
  MATRESP = MATPOST   for action = 'post'
  MATRESP is empty    for unsupported keywords
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  MATSTATE is a data structure with information about the current material state in fields
         eps    = total strain
         Deps   = strain increments from last convergence
         DDeps  = strain increments from last iteration
         epsdot = strain rate
         km     = material stiffness matrix; returned under ACTION = 'stif'
         sig    = stress; returned under ACTION = 'stif' or 'forc'
         Past   = material history variables at last converged state
         Pres   = current values of material history variables
             Past and Pres contain the following history variable(s):

                 ecmin = Smallest previous concrete strain (compression)
                 dept = Historical variable
                 km
                 eps
                 sig
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  MATDATA is a data structure with material property information; it has the fields
         fc  = Compressive strength 
         epc0 = Strain at compressive strength
         fcu = Crushing strength
         epcu = Strain at crushing strength
         lambda = Ratio between unloading slope at epscu and original slope
         ft = Concrete tensile strength
         Ets = Tension softening slope (absolute value)

    
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  MATPOST is a data structure with material response information for post-processing in fields
         eps   = total strain
         sig   = uniaxial stress

Cross-Reference Information

This function calls: