# Explicit Impact Factor for Shear in Ella

In Ella → TRAI, PHIS is explicit impact factor for shear.

In some design code, only point load (TRPL) caused shear effect is needed to be multiplied by PHIS; while the block load (TRBL) caused shear effect isn’t needed to be multiplied by PHIS.

Therefore my goal is
the shear force or reaction force due to TRAI
= shear force or reaction force due to TRPI x PHIS + shear force or reaction force due to TRBL

But I find that in Sofistik
shear force due to TRAI
= (shear force due to TRPI + shear force due to TRBL) x PHIS
reaction force due to TRAI
= reaction force due to TRPI + reaction force due to TRBL

1. How to achieve my goal in Sofistik?
2. In case Sofistik can’t handle this, I have a workaround: define two different TRAI, one with TRPI and PHIS, the other one with TRBL. Then my question is how to combine them together? Using EXCL, EXEX or any other thing?