Thermal force calculation with bearing pad for multi-column interior bent with varying column heights

Hello, I have a couple questions regarding OpenBridge Designer (LEAP Bridge Concrete Substructure). 

 - How is the thermal force calculated for a multi-column bent with elastomeric bearing pads with varying column heights? 

 - Also, how is the out-of-plane stiffness calculated for a multi-column bent with varying column heights supporting girders on elastomeric bearing pads?

 - Lastly, how is the out-of-plane stiffness calculated for a multi-column bent with different column and drilled shaft diameters to the point of fixity?

Thanks,

Danny V

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