Sliding response of rigid bodies to earthquake motions
A fundamental study of the sliding response of massive concrete blocks to earthquake ground motions, including the effect of vertical accelerations/ decelerations on the friction forces, is reported. This particular problem occurs when large concrete blocks are used as radiation shields in nuclear particle accelerator installations in seismic areas. The results of this study can also help in understanding the response of other rigid bodies (as approximated by some electrical/mechanical equipment) which are not anchored to the ground. Based upon the simple theory of friction and equations of motion, a computer program BLOKSLD was written to predict the sliding motion of a rigid block under the effect of simultaneous horizontal and vertical earthquake accelerations. The accuracy of computer-predicted results was checked against the experimental data and a satisfactory agreement (10 percent) was found. Tests were conducted with concrete blocks on a newly constructed 20 x 20 ft shaking table which can reproduce independent horizontal and vertical displacement components. Tests were made for both sinusoidal and actual earthquake ground motions. Various materials were tried between the concrete block and the shaking table to reduce the coefficient of friction and to study the suitability of such materials for this purpose. Input table accelerations and the relative displacements between table and block were recorded for comparison with computer results. (auth)
- Research Organization:
- California Univ., Berkeley (USA). Lawrence Berkeley Lab.
- DOE Contract Number:
- W-7405-ENG-48
- NSA Number:
- NSA-33-011778
- OSTI ID:
- 4118762
- Report Number(s):
- LBL--3868
- Country of Publication:
- United States
- Language:
- English
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*COMPUTER CODES-- B CODES
*EARTHQUAKES-- GROUND MOTION
*SHIELDING-- SEISMIC EFFECTS
420100* --Engineering--General Engineering
CONCRETES
EQUATIONS OF MOTION
N42000* --Engineering
N44000 --Environmental & Earth Sciences
N54200 --Particle Accelerators--Auxiliaries & Components
SHIELDING MATERIALS
SIMULATION
SLIDING FRICTION
TEST FACILITIES