Abstract
This paper describes a novel testing arrangement designed to investigate the load-deformation behavior of structural subassemblages composed of beams and beam-columns. The purpose of the tests is to investigate experimentally recently developed methods for analyzing structural frameworks. These new methods have placed greater emphasis on the behavior of the framework as a whole rather than as a collection of isolated members, and it has become necessary to study such combined behavior experimentally. The tests described allow this to be done in an efficient and practical manner and represent a step forward in the experimental study of structural behavior.
The paper describes the purpose behind the tests, the testing method adopted and the errors and assumptions involved in the testing arrangement. Test results are only briefly presented.
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Abbreviations
- a :
-
lever arm for moments
- h :
-
column height
- d :
-
depth of beam
- l :
-
length term
- r :
-
radius,r x= radius of gyration, strong axis;r y = radius of gyration, weak axis
- s :
-
beam length
- w :
-
uniformly distributed load, weight per length
- w d :
-
uniformly distributed load due to dead load
- E :
-
elastic modulus
- F :
-
jack force
- I :
-
strong-axis moment of inertia
- M :
-
moment
- M B :
-
beam moment of connection
- M c(J):
-
column-end moment from jack and beam
- M c(S) :
-
column-end moment from strain gages
- M J :
-
joint-resisting moment
- M M :
-
member-resisting moment
- M p :
-
maximum beam moment
- M SG :
-
moment from strain gages on column
- M u :
-
maximum member moment
- M 1,2,3 :
-
strain-gage moments on beam
- P :
-
applied axial load
- Q :
-
column axial load
- R :
-
beam reaction,R 0-initial,R w-self weight,R e-erection
- P y :
-
area times yield stress of column
- α:
-
joint-translation angle
- θ:
-
member-rotation angle
- θJ :
-
joint-rotation angle
- \(\bar \theta \) :
-
rotation reduced by axial shortening
- Δ:
-
joint translation
- δa :
-
shortening of stub beam
- δ ax :
-
axial shortening
- δ:
-
deflections
- δ t :
-
rolling translation of specimen
- δθ:
-
increments of rotation
References
Ojalvo, M., “Restrained Columns,”Proc. ASCE,86 (EM5),1 (Oct.1960).
Van Kuren, C. and Galambos, T. V., “Beam-column Experiments,”Proc. ASCE,90 (ST2), (Apr. 1964). T418 P506 V 3
Galambos, T. V., and Lay, M. G., “End-moment End-rotation Characteritics for Beam-columns,” Fritz Lab. Rpt. 205A.35, Lehigh Univ. (May 1962).
Beedle, L. S., “Plastic Design of Steel Frames,”J. Wiley and Sons New York (1958).
Lee, G. C. andGalambos, T. V., “Post-buckling Strength of Wideflange Beams,”Proc. ASCE,88 (EM1),59 (Feb.,1962).
Lay, M. G., “The Experimental Bases for Plastic Design,” WRC Bulletin No. 99 (Sept. 1964).
Ojalvo, M. andLu, L. W., “Analysis of Frames Loaded in the Plastic Range,”Proc. ASCE,87 (EM4),35 (Aug.1961).
Ojalvo, M., andLevi, V., “Columns in Planar Continuous Structures,”Proc. ASCE, 89 (ST-1),1 (Feb.1963).
Levi, V., “Plastic Design of Multi-story Braced Frames,” Ph.D. Dissertation, Lehigh Univ. (1962) (University Microfilms, Ann Arbor, Mich.).
American Institute of Steel Construction, “Specification for the Design, Fabrication and Erection of Structural Steel for Buildings,”AISC, New York (1963).
Huber, A., “Fixtures for Testing Pin-ended Columns,”ASTM Bltn. 234, 41 (Dec.1958).
Additional information
M. G. Lay, R. A. Aglietti and T. V. Galambos were formerly Research Instructor, Research Assistant and Research Associate Professor, respectively, at Civil Engineering Dept., Fritz Engineering Laboratory, Lehigh University, Bethlehem, Pa.
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Lay, M.G., Aglietti, R.A. & Galambos, T.V. Testing techniques for restrained beam-columns. Experimental Mechanics 6, 1–12 (1966). https://doi.org/10.1007/BF02327108
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DOI: https://doi.org/10.1007/BF02327108