I have been looking at the options of counteracting the thrust in low (20º) pitch hipped roofs.
I understand that one of the solutions employed to deal with this is to use ridge and hip beams.
It strikes me that this does not in fact work in timber as even if the beams are designed for 0 deflection the creep over time will still result in the jacks and hip rafters transmitting the full thrust.
If you could calculate exactly how much deflection will take place due to creep and shorten all the rafters in an arc acordingly and only fix them when they are loaded you could overcome this problem but I would doubt whether it was practical to achieve this.
This, I reckon, would also apply in all applications of a ridge beam?.