Rigid frame
McGraw-Hill Science & Technology Dictionary:
Top
rigid frame
(′rij·id ′frām)
(building construction) A steel skeleton frame in which the end connections of all members are rigid so that the angles they make with each other do not change.
Related Videos:
Top
Rigid frame
Top
A structural framework in which all columns and beams are rigidly connected; there are no hinged joints and the angular relationship between beam and column members are maintained under load.
Wikipedia on Answers.com:
Top
Rigid frame
 |
This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (December 2009) |
A rigid frame in structural engineering is the load-resisting skeleton constructed with straight or curved members interconnected by mostly rigid connections which resist movements induced at the joints of members. Its member can take bending moment,shear and axial loads.[1][2]
The two common assumptions as to the behavior of a building frame are (1) that its beams are free to rotate at their connections or (2) that it's members are so connected that the angles they make with each other do not change under load. Frame works with connections of intermediate stiffness will be intermediate between these two extremes. Frame works with connections of intermediate stiffness are commonly called semirigid frames. The AISC specifications recognize three basic frame types: Rigid Frame, Simple Frame, and Partially Restrained Frame.[3]
The AISC Steel Specification Commentary on Section B3 provides guidance for the classification of a connection in terms of its rigidity. The secant stiffness of the connection Ks is taken as an index property of connection stiffness. Specifically,
Ks = Ms/θs
where
Ms = moment at service loads, kip-in (N-mm)
θs = rotation at service loads, rads
The secant stiffness of the connection is compared to the rotational stiffness of the connected member as follows, in which L and EI are the length and bending rigidity, respectively, of the beam.
If KsL/EI ≥ 20, it is acceptable to consider the connection to be fully restrained (in other words, able to maintain the angles between members). If KsL/EI ≤ 2, it is acceptable to consider the connection to be simple (in other words, it rotates without developing moment). Connections with stiffnesses between these two limits are partially restrained and the stiffness, strength and ductility of the connection must be considered in the design. [4]
References
- ^ http://triadmetalroof.com/building-systems/rigid-frame-building.html
- ^ http://www.butlermfg.com/about/history.asp
- ^ Gaylord, Edwin (1992). Steel Structures. New York: McGraw-Hill, Inc. pp. 555. ISBN 0-07-023054-4.
- ^ Steel Construction Manual 14th Edition. Chicago: American Institute of Steel Construction. 2011. pp. 16.1-263. ISBN 1-56424-060-6.
 |
This article about a civil engineering topic is a stub. You can help Wikipedia by expanding it. |
 |
This architecture-related article is a stub. You can help Wikipedia by expanding it. |
 |
This engineering related article is a stub. You can help Wikipedia by expanding it. |
This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)
Post a question - any question - to the WikiAnswers community:
Copyrights:
McGraw-Hill Science & Technology Dictionary
McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved.
Read more
McGraw-Hill Dictionary of Architecture & Construction
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc. All rights reserved.
Read more
