Experimental Mechanics

, Volume 7, Issue 8, pp 321–331 | Cite as

Techniques for testing structures permitted to sway

Mechanisms are developed that eliminate restraints caused by vertical loading and lateral bracing as a structure sways, and tests on building frames attest their effectiveness
  • E. Yarimci
  • J. A. Pura
  • L. W. Lu
Article

Abstract

Mechanisms are described that eliminate the restraining effects of the loads and the lateral bracing on test specimens permitted to sway. One mechanism, called the gravity-load simulator, maintains a vertical orientation of load even as a structure sways. The other is a lateral-bracing mechanism which moves freely with a test structure even at large deflections, and it does not require any adjustments during a test. A gravity-load simulator and a lateral-bracing system designed for use in testing full-size building frames on the equipment itself and tests of building frames utilizing the mechanisms show very satisfactory behavior of the gravity-load simulator and the lateral-bracing system. Some actual test setups using the mechanisms are described. Tests on three-story full-size building frames (30-ft high) and a frame-buckling test are included.

Keywords

Mechanical Engineer Fluid Dynamics Test Specimen Test Setup Actual Test 

List of Symbols

d

load height of simulator

E

modulus of elasticity; braced point

e

distance between points where load is attached

G

shear modulus of elasticity

H

base width of simulator

I

moment of inertia in the bending plane

K

torsional constant, function of cross section (see Ref. 18)

L

arm length of simulator

M

moment about the plane of the simulator

Pcr

buckling load

r

top width of simulator

T

torque

XA

x-coordinate of the instantaneous center

x,y,z

coordinate system

α

slope of inclined leg of gravity-load simulator

Δ

deflection, subscriptsH andV refer to sway and vertical deflections, respectively

δ

deflection

θ

end slope

ϕ

twist angle

ψ

rotation of rigid member

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Copyright information

© Society for Experimental Mechanics, Inc. 1967

Authors and Affiliations

  • E. Yarimci
    • 1
  • J. A. Pura
    • 2
  • L. W. Lu
    • 3
  1. 1.Dept. of Civil and Municipal EngineeringUniversity CollegeLondonEngland
  2. 2.Dept. of Civil EngineeringUniversity of TexasAustin
  3. 3.Dept. of Civil EngineeringLehigh UniversityBethlchen

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