Performance of un-retrofitted and retrofitted wood I-joists with flange notch or web hole
department or school: Graduate Studies, College of (Okanagan)
department or school: Engineering, School of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Islam, Mohammad Shahidul
issued: 2017-03-31T15:48:41Z
issued: 2017
related degree: Doctor of Philosophy - PhD
degree grantor: University of British Columbia
description: Composite wood I-joists have been used widely as floor and roof joists in the construction of commercial and residential buildings in Europe and North America since mid-1930s. These engineered timber I-joists are less expensive, lighter in weight, stronger, and more efficient compared to the solid sawn lumber beams. According to the Canadian Standards for Wood Design (CSA-O86) and manufacturer design guidelines, flange-cut on I-joists are strictly prohibited. However, notches in the top flange and openings in the web of I-joists are commonly made during construction to facilitate the electro-mechanical systems of a building. Due to these flange-notches and web-holes, the ultimate capacity and stiffness of the I-joist section get reduced significantly. This phenomenon will be more critical in the cases of web opening at shear span and flange notch at mid span. This may lead to the I-joist fail prematurely in shear or flexure in a brittle manner. The effect of flange-notches and web-holes on the strength properties (e.g. load carrying capacity, flexural strength, and shear strength) of timber I-joists need to be understood before reinforcing those deficient I-joists. The core objective of this thesis is to understand and predict the behavior of the I-joists having flange-notch and web-hole. Another objective of this study is to retrofit notches and web-holes with conventional and composite material, determine their performances, and provide predictive equations. For retrofitting purpose, Oriented Strand Board (OSB) collars and Glass Fibre Reinforced Polymer (GFRP) plates were used as reinforcing elements with different configurations. A total of 454 I-joists were tested with different notch and hole configurations. From the test results, it was observed that the presence of notch and hole reduced the capacity and stiffness of I-joists significantly. Findings also revealed that some retrofitting options can help improve the capacity as compared to the control I-joists.…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/61072
note: PERFORMANCE OF UN-RETROFITTED AND RETROFITTED WOOD I-JOISTS WITH FLANGE NOTCH OR WEB HOLE by Mohammad Shahidul Islam B.Sc. (Civil Engineering), Bangladesh University of Engineering and Technology, Dhaka, 2003 M. Engg. (Construction Engineering and Infrastructure Management), Asian Institute of Technology, Thailand, 2005 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY in THE COLLEGE OF GRADUATE STUDIES (Civil Engineering) THE UNIVERSITY OF BRITISH COLUMBIA (Okanagan) March 2017 © Mohammad Shahidul Islam, 2017i The undersigned certify that they have read, and recommend to the College of Graduate Studies for acceptance, a thesis entitled: PERFORMANCE OF UNRETROFITTED AND RETROFITTED WOOD I-JOISTS WITH FLANGE NOTCH OR WEB HOLE Submitted by Mohammad Shahidul Islam in partial fulfillment of the requirements of The degree of DOCTOR OF PHILOSOPHY . Dr. M. Shahria Alam, Associate Professor, School of Engineering, UBC Supervisor, Professor Dr. Kasun Hewage, Associate Professor, School of Engineering, UBC Supervisory Committee Member, Professor Dr. Ahmad Rteil, Assistant Professor, School of Engineering, UBC Supervisory Committee Member, Professor Dr. Thomas Johnson, Assistant Professor, School of Engineering, UBC University Examiner, Professor Dr. Rakesh Gupta, Professor, Department of Wood Science and Engineering, Oregon State University, Corvallis External Examiner, Professor 21 March 2017 (Date submitted to Grad Studies) Additional Committee Members include: Dr. Jonathan Holzman, Associate Professor, School of Engineering, UBCO Neutral Chair ii ABSTRACT Composite wood I-joists have been used widely as floor and roof joists in the construction of commercial and residential buildings in Europe and North America since mid-1930s. These engineered timber I-joists are less expensive, lighter in weight, stronger, and more efficient compared to the solid sawn lumber beams. According to the Canadian Standards for Wood Design (CSA…
has type: Thesis/Dissertation
date issued: 2016-05
is shown at: 10.14288/1.0343438
language: eng
degree discipline: Civil Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/61072