three-hinged arch

three-hinged arch

An arch with hinges at the two supports and at the crown.
References in periodicals archive ?
The three-hinged arch features an unusually long span and is designed to accommodate both vertical and horizontal curves.
The bridge design utilizes application guidelines established by the Illinois Department of Transportation, American Association of State Highway and Transportation Officials, American Institute of Timber Construction, and the National Forest Products Association for a three-hinged arch type bridge.
Conclusions were reached that the basic distress was principally due to seasonal expansions and contractions that cracked the roof to "naturally" create a three-hinged arch mechanism that is able to accommodate these displacements.
After numerous discussions and examining the studies in detail, we decided that since the distress cracks have been active as a three-hinged arch mechanism for years, it would be better not to disturb the equilibrium condition.