A barrel roof is a curved roof that, especially from below, is curved like a cut-away barrel. They have some advantages over dome roofs, especially being able to cover rectangular buildings.

Barrel roof tile
Barrel roofing the Boston Convention Center.
Properties of stresses on barrel roof frames by fluctuating wind pressures
On the design wind loads for frames supporting a barrel roof
Repair and rehabilitation of a historic masonry barrel roof structure.
Gust factor of load effects on the frames of barrel roof by wind pressures : On influence of rise span ratio
ETHNO-CONFESSIONAL MARKERS OF RUSSIAN IDENTITY IN THE 17TH–18TH-CENTURY SIBERIA: CHURCHES WITH BARREL ROOFING ☆
CHARACTERISTICS OF STRESS GENERATED BY THE FLUCTUATING WIND PRESSURES ACTING ON CIRCULAR ARCHES SUPPORTING A BARREL ROOF
CHARACTERISTICS OF STRESS GENERATED BY WIND PRESSURES AND WIND LOADS ACTING ON STIFF TWO-HINGED ARCHES SUPPORTING A BARREL ROOF
Ultimate Strength of A Cylindrical Shell Roof with Eaves : Part 3 An Ultimate Strength of Reinforced Concrete Barrel Roof with Eaves...