Ever since the existence of mankind, it has noticed a remarkable advancement in field of science and technology. Traditional hand weaving methods have been replaced by modern and speedy looms machine. With faster production rate, these machines proved to be a boon for textile manufacturers. However, they come with an unnoticed problem of “vibration”. Hence, there arises a need to study the effects of vibrations on the structural as well as non structural components of the building.
Here in this project, an attempt has been made to study the dynamic behavior of a structure for looms industry subjected to vibration due to operations of looms machine; by changing its various parameters. With an increase in demand of textile, more and more looms machines are being installed every day. While designing the structure to house these looms it becomes incumbent upon the designer to curtail the amplitude of vibrations within the permissible limits. One must also make sure that the frequency of structure is separated for operating frequency of machine by a good margin, so that the “Resonance Condition” can be avoided.
The looms machine fall under the category of reciprocating machine and have medium operating speed ranging from 100 rpm to 180 rpm. The main source of vibration is the Beating-Up motion. This generates a Harmonic Load due to the unbalanced force caused by the reciprocating sley movement. Hence, the designing of structure for looms industry is a complex process which needs prime considerations. The cost of dynamic analysis of these structure is paramount, hence a small fraction of amount is being spent might lead to inadequately constructed structures which may result in failure and shut downs, exceeding many times the cost of the capital investment required for properly designed and built structure.
Now, in such a case by executing parametric study, one can decide which parameter out of many is most sensitive to odd results, so that by varying those parameters only results can be brought to the required level and do not affect other reliable results. An attempt is made in the thesis to carry out a parametric study by using software STAAD. Pro
Following Parameters are studied in this thesis
1. Sizes of Column
2. Sizes of Beams
3. Story Height
4. Number of Stories
Effect of remedial measures like:
1. Cross Bracing below Plinth Level
2. Full Length Jacketing of Columns
3. Partial Length Jacketing of Columns
4. Cross Tie-Beams
5. Haunches at the Junction
Table of Contents
1. Introduction
1.1 History of Textile
1.2 History of Textile Industry in Surat City
1.3 Problem Definition
2. Aim of the Study
3. Literature Review
4. Theoretical Background
4.1 Vibration Theory
4.1.1 Definition
4.1.2 Types of Loads
4.1.3 Degree of Freedom
4.1.4 Resonance
4.2 Classification of Machines
4.2.1 Rotating Machinery
4.2.2 Reciprocating Machinery
4.2.3 Impulsive Machinery
4.3 Types of Foundations
4.3.1 Block-type foundation
4.3.2 Combined block-type foundation
4.3.3 Pile foundations
4.3.4 Wall type foundations
4.3.5 Framed-type foundation
4.4 Load Acting on the Structure
4.4.1 Construction load
4.4.2 Live load
4.4.3 Time History Load
4.5 Working of Shuttle Looms
4.5.1 Primary Motion
4.5.2 Secondary Motion
4.5.3 Ancillary Motion
4.6 Source of Vibration – The Beating-Up Motion
4.7 Codal Requirements
4.7.1 General requirements of Machine Foundation
4.7.1.1 General
4.7.1.2 Static Design
4.7.1.3 Dynamic Design
4.7.2 Design Criteria
4.8 Various Types of Remedial Techniques
4.8.1 Cross-Bracing
4.8.2 Jacketing of Columns
4.8.3 Tie-Beams
4.8.4 Haunches
5. Numerical Study and Results of Dynamic Analysis for an Industrial Building
5.1 General
5.2 Building Geometry
5.2.1 Ground Storey Building
5.2.2 Ground + One Storey Building
5.2.3 Ground + Two Storey Building
5.2.4 Loads acting on the Structure
5.3 Typical Input Data Required
5.3.1 Building Geometry
5.3.2 Material Data
5.3.3 Machine Data
5.3.4 Loads acting on the Structure
5.4 Expected Output Results
5.5 Typical Steps of defining Numerical Problem in STAAD.Pro
5.6 Numerical Study Problem
5.6.1 Building Geometry
5.6.2 Material Data
5.6.3 Shuttle Loom Machine Data
5.6.4 Loads Acting on the Structure
5.7 Numerical Study on Remedial Measures
6. Discussion and Conclusion
6.1 Concluding Remarks for Ground Storey Building
6.2 Concluding Remarks for Ground + One Storey Building
6.3 Concluding Remarks for Ground + Two Storey Building
6.4 Concluding Remarks on Remedial Measure of Ground Storey Building
6.5 Concluding Remarks on Remedial Measure of Ground + One Storey Building
6.6 Concluding Remarks on Remedial Measure of Ground + Two Storey Building
Objectives and Topics
This report presents a parametric study on the dynamic analysis of structures for the looms industry. It aims to investigate the effects of structural component sizes (columns, beams, number of stories, and storey height) and various remedial measures (such as cross-bracing, jacketing, tie-beams, and haunches) on the building's dynamic response, specifically targeting the mitigation of machine-induced vibrations and the avoidance of resonance conditions.
- Dynamic behavior analysis of industrial structures housing looms.
- Impact of structural parameter variations (column/beam sizes, building geometry) on vibration.
- Evaluation of resonance conditions caused by reciprocating loom machinery.
- Assessment of structural remedial techniques to enhance performance.
- Parametric study utilizing STAAD.Pro software for structural modeling.
Excerpt from the Book
1.3 Problem Definition
Vibration can be defined as regularly and repeated movement of a physical object about a fixed point. The parameter normally used to assess the vibration is the resonance, frequency, amplitude etc. In order to completely define a vibration, the amplitude and frequency of motion are measured in three orthogonal directions, generally in terms of velocity which is considered to be the best description for assessing the potential damage response of a structure. There are many sources of vibration capable of producing motion sufficient to be perceptible by the occupants of the building. Various sources of vibrations are:
External Sources
Seismic activity
Subway, road and rail systems
Industrial works
Construction equipments
Summary of Chapters
Introduction: Provides an overview of the textile industry's evolution, specifically in Surat, and defines the problem of machine-induced vibrations in loom structures.
Aim of the Study: Outlines the project's objective to perform a parametric study on how various structural modifications affect dynamic performance parameters.
Literature Review: Discusses existing research on vibration theory, machine foundation design, and structural strengthening techniques.
Theoretical Background: Explains the fundamental principles of vibration theory, load types, and classification of machines used in the context of industrial structures.
Numerical Study and Results of Dynamic Analysis for an Industrial Building: Details the modeling approach using STAAD.Pro, the parameters studied, and presents the extensive results of the dynamic analysis and remedial measures.
Discussion and Conclusion: Interprets the study results and summarizes the findings regarding the effectiveness of different remedial measures in mitigating resonance and vibrations.
Keywords
Dynamic Analysis, Looms Industry, Parametric Study, Vibration Control, Resonance Condition, Reciprocating Machinery, Structural Strengthening, Column Jacketing, Cross-Bracing, STAAD.Pro, Industrial Buildings, Beam Haunches, Structural Dynamics, Tie-Beams, Resonance Mitigation.
Frequently Asked Questions
What is the core focus of this research report?
The report focuses on the dynamic analysis of industrial buildings designed to house looms. It investigates how vibrations caused by reciprocating loom machinery affect the structural integrity of the building.
What are the primary themes addressed in this study?
The core themes include the impact of building geometry and structural member sizes on dynamic response, the avoidance of resonance conditions, and the evaluation of remedial structural techniques.
What is the main objective or research question of this study?
The primary objective is to execute a parametric study to determine how altering structural components (beams, columns, building height) and applying remedial measures can effectively reduce machine-induced vibrations and prevent resonance in looms industry buildings.
Which scientific or analytical method is employed in this research?
The research utilizes numerical analysis through structural modeling. Specifically, the STAAD.Pro software is used to simulate the dynamic behavior of various building configurations and remedial designs.
What topics are covered in the main body of the work?
The main body covers theoretical vibration background, machine classification, foundation types, parametric modeling steps, and extensive tabular/graphical results of the structural response under different design scenarios.
Which specific terms best define this study?
Key terms include Dynamic Analysis, Parametric Study, Resonance Condition, Structural Strengthening, and Machine Induced Vibration.
How does column jacketing contribute to vibration reduction?
Column jacketing, particularly full-length jacketing, increases the member size and overall stiffness of the building frame, effectively moving the structure's natural frequency away from the operating frequency of the machinery to avoid resonance.
Why is cross-bracing less effective than full-length jacketing?
According to the study, while cross-bracing provides lateral stiffness, its effectiveness in vibration reduction is relatively lower compared to full-length jacketing because it does not as effectively alter the structural dynamics to meet over-tuned conditions.
Are haunches considered a successful remedial measure?
The study concludes that haunches are not consistently effective as a standalone structural remedy for avoiding the resonance condition, showing minor or negligible improvements compared to other measures.
- Citar trabajo
- Jigar Sevalia (Autor), Yogesh Rathod (Autor), Sunil Kukadiya (Autor), Sarthi Bhavsar (Autor), 2013, Dynamic Analysis of Structures for Looms Industry, Múnich, GRIN Verlag, https://www.grin.com/document/280411
