How are airliners secured on the ground during hurricanes? Say a major hurricane is expected to hit. Given that the weather is known beforehand, what can be done to avoid damage to the airliners sitting on the tarmac?

Fly every plane away - not very economical, considering that commercial operations cease at the last minute.

Move all planes into a hangar - a Boeing 747 takes a huge hangar to park. It may be possible to move all GA planes inside, but certainly not airliners.

Planes are designed to interact with winds; the wings is meant to generate lift, and the sideway forces on a vertical stabilizer is meant to swing a plane around. What procedures would minimize the stress put in the airframe by the 100+km/h winds?
Looking at the hurricane manuals for a few airports, evacuating flyable aircraft to a safer location tends to be the most common choice.
From the Boca Raton Airport: 

Effective with the issuance of a Storm WARNING and/or Hurricane WARNING:
Relocate flyable aircraft to other geographical areas, place under suitable shelter, or secure as appropriate.

Also, from the Miami International Airport:

Upon receipt of a Hurricane Warning, Airside Operations will:

Initiate evacuation of all flyable aircraft and post Airfield Operations Senior Agents and Agents in detail to insure compliance and report results.