Design of spread foundation subjected to machine-induced vibrations using finite element method

Date

7-2015

Degree

Bachelor of Science in Civil Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Jedidiah Joel C. Aguirre

Abstract

In order to maximize the efficiency of machines, every details comprising to it should not be overlooked, including its supporting structure. An inadequate machine foundation can cause economic losses greater than that of the costs spent in the design and construction of the foundation itself. To prevent such losses, design of spread foundation subjected to machine-induced vibrations is performed. Finite element method (FEM) of analysis, using Staad. Pro is used to model the machine-foundation-soil (MFS) system. Machine foundation consists of two pedestals, compressor and motor block, and one common footing. Five types of soil are used in this study so as to account the behavior of the machine foundation depending on the variability of soil properties. Response time history analysis is used to deermine the responses in terms of amplitude displacement of the system. However, modal analysis is used to determine the natural frequency and mode shapes of the system. These are the two design criteria considered in the study. In every soil type, maximum amplitude displacements of the system are produced on top of the motor block. Compared to the other types of soil, less amplitude displacements are produced on foundation resting on Soil Type A, and greater on soil Type E. On the other hand, governing frequency of the system per soil type did not lie on the pre-determined renosance region thus renosance did not occur in the system. With that, machine foundation didn't undergoes large displacements and stresses. Considering the established design, criteria, determined soil, and machine parameters, an optimal design of the machine foundation is obtained.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993 2015 E63 /B35

Document Type

Thesis

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