Eleby, 39, is the one who set the fire, police said. He has been arrested 19 times since 2000, mostly on drug offenses. The fire broke out Thursday afternoon in an area used to store state-owned construction materials and equipment. Experts in structural engineering said fires on highways and bridges rarely burn long enough or hot enough to cause a complete collapse. However, this time it has happened. The highway collapse in Atlanta forced commuters Friday to find different routes to work or to use mass transit and things won’t be back to normal for months. Hundreds feet of highway will need to be replaced in both directions on I-85, which carries about 400,000 cars a day. The route is also a popular one used to get to Hartsfield Jackson, the busiest airport in the world.