Design of Equipment Foundations

The course starts with the basic concepts & practical "rules of thumb" used in preliminary layout & sizing of the foundations but goes significantly beyond, focusing on explanation & demystifying of the basic concepts, relating them to the first...

Course Outline

After participating in this course, you will be able to:
• Consider in design the behaviour of soils under dynamic loading
• Calculate dynamic loads from various types of machinery
• Follow the decision process to select the type of foundation: shallow or pile
• Build on your understanding of the dynamic response of tabletop structures for equipment support
• Analyze dynamic response of various types of shallow and pile foundations
• Apply the knowledge of analysis and design procedure for equipment foundation design
• Evaluate vibration damage and take suitable remedial measures

Description

Design of Equipment Foundations is a composite discipline, involving elements of structural engineering (statics and dynamics), foundation, geotechnical and mechanical engineering. The course considers the type of loads (static and dynamic) induced by the various types of machinery, modes of structural response of the foundation and/or supporting frame, as well as the response and damping provided by the soils. The course covers fundamentals of machine dynamics for derivation of the applied loads, behaviour of different types of rigid block and pile-supported foundations, analysis and design of tabletop structures for equipment support, machine foundations on frozen soils, vibration damage assessment and prevention. Practical examples implementing the introduced principles are included.

The course starts with the basic concepts and practical “rules of thumb” used in preliminary layout and sizing of the foundations but goes significantly beyond, focusing on explanation and demystifying of the basic concepts, relating them to the first principles of engineering. This course will enable you to design equipment foundations using software such as Excel and common finite element packages without resorting to custom design software. This promotes better understanding and control over the results and adaptability of the design for changing design parameters.

Prerequisite: This is an advanced, post-graduate level course targeting skilled designers who want to learn how to solve complex and nonstandard design problems with full understanding of the nature of the structural behaviour. The access to a laptop computer during the seminar is beneficial, not essential. Working knowledge of mathematics from standard engineering curriculum is required to derive full benefit from this course.

Objective

To provide participants with sound understanding of the concepts, principles, and techniques of designing foundations for different types of equipment.

Who Should Attend

Consulting engineers (civil, structural, and geotechnical) who must analyze and design equipment foundations and therefore wish to acquire advanced knowledge and practical design skills.

Special Feature: Participants will work on several examples under instructor guidance.

Faculty:  Konstantin G. Ashkinadze, PhD, P.Eng.

Program Outline

Day I

Registration and Coffee

Welcome, Introduction, Workshop Preview, Learning Outcomes and the Assessment Method

Introduction to Design of Equipment Foundations
Design objectives, design procedure, degrees of freedom, pure and coupled modes of vibration.  Types of foundations and their uses: rigid block foundations, mat foundations, deep foundations, the significance of damping

Method of Dynamic Impedance
Mathematical models: method of adjoined mass, method of elastic wave radiation, method of dynamic impedance, proof of their equivalence, introduction of complex stiffness/ damping functions

Dynamic Soil Properties
Small strain elastic moduli of soil, shear wave, compression wave, methods of soil exploration for dynamic problems

Design of Shallow Foundations 
Theory of isotropic and layered elastic half-space vs half-plane, response of circular footings, shape factors for response of non-circular footings, stiffness and damping functions, effect of footing embedment

Design Example
Free vibration analysis of a rigid block foundation

Design of Pile Foundations - Single Piles
Examples of piles applications, effect of vibration on static pile design, mathematical models for pile dynamic analysis, stiffness and damping of single piles, pile dynamic response – analytical methods, pile dynamic response using common FE software

Adjournment

Day II

Design of Pile Foundations - Pile Groups
Pile-soil-pile interaction - static and dynamic, group factors for pile stiffness reduction

Design Example
Common pump foundation on piles (illustrates the concept of “good” vs “bad” speed range for rotary machinery)

Dynamic Response of Vibratory Machinery Foundations
Dynamic forces from reciprocating machinery, dynamic forces from rotary machinery, high-tuned and low-tuned foundations, normal and abnormal regimes, basics of rotor dynamics, critical and tripping speeds

Dynamic Response of Impact Machinery Foundations
Types of impact machinery, foundations for impact machinery, design criteria, derivation of impact forces, mathematical models and methods of solution

Vibration Damage and Taking Suitable Remedial Measures
Design criteria, resonance separation, admissible dynamic amplitudes and velocities, stationary and transitional resonance, problem assessment and evaluation, remedial principles and techniques

Adjournment

Day III

Tabletop Structures
Definitions, modes of oscillation, foundation-structure interaction, stiffness and damping, static and dynamic design criteria

Dynamically Loaded Foundations on Frozen Soils
Frost effects, dynamic properties of frozen soil, design considerations, static and dynamic design criteria

Methods of Analysis (based on example)
Hand analysis using MS Excel and similar programs: generalized dynamic models, equations for free vibrations, equations for forced vibrations

Methods of Analysis (based on example)
Demonstration of computer analysis using common FE software

Open Forum

Questions and Answers and Feedback to Participants on Achievement of Learning Outcomes

There will be a one-hour lunch break each day in addition to refreshment and networking breaks during the morning and afternoon. 

Daily Schedule:
8:00   Registration and Coffee (Day I only)
8:30   Session begins
12:00 Lunch
4:30   Adjournment

Additional Details

Pre-Requisites

This is an advanced, post-graduate level course targeting skilled designers who want to learn how to solve complex and nonstandard design problems with full understanding of the nature of the structural behaviour. The access to a laptop computer during the seminar is beneficial, not essential. Working knowledge of mathematics from standard engineering curriculum is required to derive full benefit from this course.

Certificates offered

1.8 CEU / 18 PDH

Cancellation Policy

To withdraw from a course, you must send a request, in writing, with the official receipt to our office. Fifteen or more business days in advance: full refund less $50.00 administration charge. Five to fifteen business days in advance: non-refundable credit of equal value for any future EPIC seminar within one year. Credits are transferable within your organization. In case of an unexpected event occurring after this time, you may send someone else to take your place without any additional cost.

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Would have liked more interactive problem solving.

Reviewed by Allen A. 2011