Location
St. Louis, Missouri
Date
03 Jun 1993, 4:30 pm - 5:30 pm
Abstract
This paper presents the results of comparison of the computed and observed response of two block foundations made of concrete. The test blocks measuring 3.0m x 1.5m x 0.7m and 1.5m x 0.75m x
0.70m were cast on level ground. The blocks were excited into vertical vibrations using a speed controlled mechanical oscillator. The amplitudes of vibration at different frequencies of excitation were measured in each case using acceleration transducers mounted on appropriate faces of the block. Dynamic shear modulus at this site was also determined b¥ conducting in-situ tests namely the wave propagation test, the cyclic plate load test, and the standard penetration tests. From this data the dynamic shear modulus versus shear strain plot was obtained. The natural frequencies and the vibration amplitudes of the test blocks were then calculated by (i) the linear spring method, (ii) the elastic half space method. A comparison was then made of the observed and computed natural frequencies and the vibration amplitudes of the blocks. The results of this comparison showed that for the cases of vertical vibrations, the natural frequencies in this case could be reasonably predicted by either of the methods used. The calculated and observed amplitudes, however, showed a wide variation. The details of tests performed and the analysis are discussed in this paper.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
3rd Conference of the International Conference on Case Histories in Geotechnical Engineering
Publisher
University of Missouri--Rolla
Document Version
Final Version
Rights
© 1993 University of Missouri--Rolla, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Puri, Vijay K. and Das, Braja M., "Dynamic Response of Block Foundations" (1993). International Conference on Case Histories in Geotechnical Engineering. 9.
https://scholarsmine.mst.edu/icchge/3icchge/3icchge-session04/9
Dynamic Response of Block Foundations
St. Louis, Missouri
This paper presents the results of comparison of the computed and observed response of two block foundations made of concrete. The test blocks measuring 3.0m x 1.5m x 0.7m and 1.5m x 0.75m x
0.70m were cast on level ground. The blocks were excited into vertical vibrations using a speed controlled mechanical oscillator. The amplitudes of vibration at different frequencies of excitation were measured in each case using acceleration transducers mounted on appropriate faces of the block. Dynamic shear modulus at this site was also determined b¥ conducting in-situ tests namely the wave propagation test, the cyclic plate load test, and the standard penetration tests. From this data the dynamic shear modulus versus shear strain plot was obtained. The natural frequencies and the vibration amplitudes of the test blocks were then calculated by (i) the linear spring method, (ii) the elastic half space method. A comparison was then made of the observed and computed natural frequencies and the vibration amplitudes of the blocks. The results of this comparison showed that for the cases of vertical vibrations, the natural frequencies in this case could be reasonably predicted by either of the methods used. The calculated and observed amplitudes, however, showed a wide variation. The details of tests performed and the analysis are discussed in this paper.
