Nonbuilding Structures and Nonstructural Components

Single Abstract

343704 - Dynamic Response of a Four-Cylinder Compressor Foundation Considering the Effect of Soil-Foundation Interaction- A Case Study

Friday, April 20
1:30 PM - 3:00 PM
Location: 201C

The dynamic response of machine foundation system depends on several factors such as: the soil dynamic properties, the geometric properties of the foundation, the amplitude of the applied dynamic loads and the frequency of the exciting dynamic force. Those factors will drive the dynamic response of the machine foundation system. Under the influence of those factors, the main objective in machine foundation design is to keep the foundation response within a specific limit of response in order to enable a satisfactory operation of the machine. If the foundation response exceeds this limit, the foundation will adversely affect the performance of the machine and may damage the machine internals, or cause it not to function properly, i.e., tip the compressor machine. Furthermore, the excessive vibrations will impose additional stresses on the machine resulting in increased unbalance loading and thus leading to increased dynamic loads on the soil-foundation system. This paper presents the results of the dynamic analysis of a four-cylinder compressor foundation considering the effect of the soil-foundation interaction. The original design of the foundation was performed in the early 60’s and ignored the effect of the soil in the response of the foundation system. Thus, the foundation has been suffering from excessive foundation vibration. The foundation block supports a 4-cylinder Dress-Rand compressor, suction bottles, discharge bottles, a crank and driving motor with a total weight of approximately 219 kips. Three-dimensional finite element dynamic analysis was performed, the results were used to determine the dynamic response of the soil-foundation system under applied dynamic loading resulting from the compressor crank. The dynamic analysis is performed by: (1) performing eigenvalue analysis of the foundation block, considering the effect of the soil-foundation interaction, to determine the soil-foundation natural frequencies and modal participation factors, and (2) performing forced response of the foundation under applied crank shaft unbalance load to determine the forced response amplitude of the soil-foundation system.

O. Salem Ali

Structural Engineering Manager
Structural Technologies, LLC

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Mustafa Mahamid

Clinical Associate Professor
University of Illinois at Chicago

Mustafa Mahamid is currently a Clinical Associate Professor at the University of Illinois at Chicago and a structural Engineering consultant for multiple structural engineering firms. He serves on several technical committees. He is a Fellow of ASCE, a Fellow of SEI, licensed structural engineer (SE) and professional engineer (PE & P.Eng.).

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343704 - Dynamic Response of a Four-Cylinder Compressor Foundation Considering the Effect of Soil-Foundation Interaction- A Case Study



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