Member properties for web tapered sections in open staad.

As such there is no specific method for getting the property. However, you can use GetSectionPropertyValuesEx() passing the property reference id and a double array of size 16.
The values returned for a tapered-I section in the array are ,
0 = D1
1 = Tw
2 = D2
3 = Bf-top
4 = Tf-top
5 = Bf-btm
6 = Tf-btm

where the left side numbers indicate the position in the array. Hope this helps.

Tried lot, could  you share complete code, In open staad there is not command for getting tapered section properties 

Tried lot, could  you share complete code, In open staad there is not command for getting tapered section properties