How to model non linear temperature Gradient on SAP2k

[lerod07]

I currently have a Finite Element model of a 2 span box-girder bridge and I want to model its response to a non-linear temperature gradient. SAP gives me various options to apply temperature but only linearly and It won't let me use the bridge modeler's option to apply temperature gradients because my model is made of Shells and objects and not model with bridge components.

What can I do? Any thoughts on how I can do these?

Thanks