What is the shear transfer coefficient for open (C1) and close crack (C2), respectively, of reinforced concrete? This is used in TBDATA for material Solid65. 

As far as I know, for both types of cracking, 0 means no shear transfer, 1 means full shear transfer. C1 means there is cracking, C2 means when the concrete does not have any cracking. Do I understand it correctly? If not, please tell me.