Location

St. Louis, Missouri

Session Start Date

3-11-1991

Session End Date

3-15-1991

Abstract

Behaviour of a 67 m tall R.C.C. twin storage-cum-blending cement silo has been studied under blast loads from a nearby limestone quarry. This paper reports the findings of the analytical and experimental studies and verification of the results of analysis by the measurements made on the prototype structure, which agreed within 10%. Acceleration response of the structure were recorded for a blast of 2.61 t having six delays with maximum charge per delay 800 kg. A series of small and large size blasts were conducted to establish relationship between peak ground acceleration and distance from the blast. Non-dimensional acceleration response spectra were also computed for the two large size blasts of 2.61 t and 3.91 t. Only some of the higher modes of the vibration are found to have significant contribution to the response. Further, the measured values response agreed closely with the computed values, indicating rationality of the analysis as well as the relationship developed between peak ground acceleration and distance. Also a damping value of 2% critical has been found to be most appropriate. It is seen that the acceleration responses are dominated by the higher modes of vibration upto the 6th mode while the shear forces and moments are mainly contributed by the first three modes of vibration, the second mode alone contributing 95% to the base shear and 84% to the base moment.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Meeting Name

Second Conference

Publisher

University of Missouri--Rolla

Publication Date

3-11-1991

Document Version

Final Version

Rights

© 1991 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Mar 11th, 12:00 AM Mar 15th, 12:00 AM

Performance of a Cement Silo under Quarry Blast

St. Louis, Missouri

Behaviour of a 67 m tall R.C.C. twin storage-cum-blending cement silo has been studied under blast loads from a nearby limestone quarry. This paper reports the findings of the analytical and experimental studies and verification of the results of analysis by the measurements made on the prototype structure, which agreed within 10%. Acceleration response of the structure were recorded for a blast of 2.61 t having six delays with maximum charge per delay 800 kg. A series of small and large size blasts were conducted to establish relationship between peak ground acceleration and distance from the blast. Non-dimensional acceleration response spectra were also computed for the two large size blasts of 2.61 t and 3.91 t. Only some of the higher modes of the vibration are found to have significant contribution to the response. Further, the measured values response agreed closely with the computed values, indicating rationality of the analysis as well as the relationship developed between peak ground acceleration and distance. Also a damping value of 2% critical has been found to be most appropriate. It is seen that the acceleration responses are dominated by the higher modes of vibration upto the 6th mode while the shear forces and moments are mainly contributed by the first three modes of vibration, the second mode alone contributing 95% to the base shear and 84% to the base moment.