helical stair

helical stair

A stair whose treads are wrapped around a helix: commonly called a spiral stair. See also: Stair
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

spiral stair, caracole, circular stair, cockle stair, corkscrew stair, spiral staircase

spiral stair
A flight of stairs, circular in plan, whose treads wind around a central newel. Also called a helical stair, solid newel stair.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
Advance PowerPack 2016 for Autodesk[R] Advance Steel 2016 adds a wealth of localized manufacturer profiles and default settings, as well as new tools for creating splines of complex helical stair stringers, tools for automatic creation of floor coverings to standard grating sizes, improvements to many of the existing tools with new functionality and strategically, the introduction of a bi-directional link with Autodesk[R] Advance Steel and Advance Workshop that allows users to retrieve and graphically display production data in real-time, which can be published to the cloud for access in the field.
Simplistically, a helical stair's outer stringer tends to act like a beam, whilst the inner stringer tends to act like a column.
Joint Ld Case X-Force Y Force Z-Force No No kN kN kN 1 1 -69.8724 8.3600 173.8100 29 1 7.1738 -7.6149 12.529 30 1 48.2668 9.3073 -9.2382 58 1 14.4319 -10.0523 18.9560 An example of a helical stair model--the negative Z reaction indicates uplift at Node 30
Again, however, specifics of place have prevailed as the cruciform arrangement has been usefully colonised by exhibition designers Thomas Matthews and linked by A & M's dramatic helical stair, situated at the crossing point where the Thompson Equatorial telescope originally stood.
Larson wondered at the difficulty of installing the helical stair. Ironically, installing the stair was straightforward.
Instead of using his original plan for a wall of glass, the architect settled on a half-wall of windows, which draws a visitor's attention away from the window and focuses it on the helical stair. The window plan also diminishes the A motif.
A gym, sauna, hydrotherapy bath and music room are located in adjacent modules, while an upper deck, reached via a helical stair rising through an atrium, has a tv lounge, library and office.
The two parts are linked by a helical stair that sweeps down in a supple curve from the new entrance hall that anchors the north edge of the exhibition space.
Spiralling up from the main hall, a helical stair leads to the various reading room levels.