Limit state design of timber I-joists with web openings and flange notches
department or school: Applied Science, Faculty of
department or school: Engineering, School of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Ahmadipour, Moein
issued: 2023-08-28T22:28:17Z
issued: 2023
related degree: Doctor of Philosophy - PhD
degree grantor: University of British Columbia
description: Wood has been a key construction material in North America and around the world for decades for the principal residence of the public. It is gaining constant attention due to its renewability nature, cost-effectiveness and lightweight compared to other major construction materials. I-joists are engineered timber beams widely used in the building industry as main structural components. They have gained popularity over conventional sawn lumber beams, thanks to their effectiveness and convenience of use. These beams are mainly meant to carry the loads in roof and floor systems. During construction, however, these beams are often drilled in their web or notched through their flange to pass service, electrical or mechanical facilities through. Even though this makes them more favorable for construction, cutting the beam through can reduce its capacity to a significant extent. This raises serious concerns for the safety of the structure and the public. It is vital to notify the responsible sectors of the importance of this fact and have guidelines to evaluate the extent of the decadence and design the joists accordingly. The current wood design code in Canada does not have direct instructions for designing I-joists with openings. In the absence of verified test results, it leaves the allowability of web openings with I-joist manufacturers and does not allow flange cuts. In practice, however, it has been seen that these limits are at times contravened, and joists are retrofitted improperly using unsupported methods to compensate for their reduced capacity. Having a guideline for openings in I-joists will lead to safer and more efficient building designs. Such guidelines will provide structural engineers with directions to determine the sufficiency of I-joists considering their opening’s shape, location and size. It may also help designers find remedies to reinforce the joists by retrofitting them using approved means. In this PhD dissertation, the stiffness of simply-suppo…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/85650
note: LIMIT STATE DESIGN OF TIMBER I-JOISTS WITH WEB OPENINGS AND FLANGE NOTCHES by Moein Ahmadipour B.A.Sc., Shiraz University, 2010 M.A.Sc., Shiraz University, 2012 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) August 2023 © Moein Ahmadipour, 2023 ii The following individuals certify that they have read, and recommend to the College of Graduate Studies for acceptance, a thesis/dissertation entitled: LIMIT STATE DESIGN OF TIMBER I-JOISTS WITH WEB OPENINGS AND FLANGE NOTCHES submitted by Moein Ahmadipour in partial fulfillment of the requirements of the degree of Doctor of Philosophy . Dr. Shahria Alam, School of Engineering Supervisor Dr. Abbas S. Milani, School of Engineering Supervisory Committee Member Dr. Rudolf Seethaler, School of Engineering Supervisory Committee Member Dr. Thomas Johnson, School of Engineering University Examiner Dr. Ying Hei Chui, Department of Civil and Environmental Engineering, University of Alberta External Examiner iii ABSTRACT Wood has been a key construction material in North America and around the world for decades for the principal residence of the public. It is gaining constant attention due to its renewability nature, cost-effectiveness and lightweight compared to other major construction materials. I-joists are engineered timber beams widely used in the building industry as main structural components. They have gained popularity over conventional sawn lumber beams, thanks to their effectiveness and convenience of use. These beams are mainly meant to carry the loads in roof and floor systems. During construction, however, these beams are often drilled in their web or notched through their flange to pass service, electrical or mechanical facilities through. Even though this makes them more favorable for construction, cutting the beam through can reduce its capacity to a significant …
has type: Thesis/Dissertation
date issued: 2023-09
is shown at: 10.14288/1.0435603
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
contributor: Alam, M. Shahria
type: Text
identifier URI: http://hdl.handle.net/2429/85650