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UBC Theses and Dissertations
Testing and analysis of Midply(TM) Shear Wall System Lungu, Dan
Abstract
The thesis details a six-month period of experimental studies of the structural properties of the MIDPLY™ Wall System, which has being developed through a three-year testing program. The MIDPLY™ shear wall was invented by Dr. Erol Varoglu, formerly with Forintek Canada Corp. and Prof. S.F. Stiemer (University of British Columbia), US Patent US5782054: Wood wall structure. The system provides greater lateral resistance to earthquakes and high winds loads. The name MIDPLY™ refers to its configuration: the plywood or OSB panel is placed between the studs. The improved performance is due to this special rearrangement of wall framing components and sheathing used in standard shear walls. The new fabrication system uses typical building methods and standard building materials, but a prefabricated production may be desirable to ensure the quality of the product. The objective of the project is to establish the proof-of-concept for the MIDPLY™ Wall System, design and construction method. The structural properties are being developed through testing of full-scale specimens subjected to monotonic (ramp), cyclic and dynamic displacement schedules. Several anchoring techniques and hold-down connectors have been developed and tested. The tests were performed mainly on 2.44m x 2.44m and 1.22m x 2.44m MIDPLY™ shear walls. In the investigations covered by this thesis, were designed and tested 30 walls and were primarily studied: • Alternate hold-down connections that prevent the fracture of the end studs of the MIDPLY™ wall by using MSR lumber or inverted-triangle hold-downs with different bolt spacing, bolt diameters, hold-down length and placement along the stud. • Alternate hold-down connectors: steel rods and double shear hold-downs. • The performance of MIDPLY™ walls under pseudo-dynamic tests. • The performance of MIDPLY™ walls used as insert segments in standard shear walls. • The performance of MIDPLY™ walls with openings. Special attention was given to the connection details between header and MIDPLY™ walls to achieve desired pinor moment-connection. • The performance of MIDPLY™ walls affected by shrinkage. • The performance of repaired MIDPLY™ walls. One can conclude that, there are many real-life applications of the system, using the superior structural performance of the MIDPLY™ walls. Thus, future studies will conduct to a final package of design values needed for structural engineers, architects and designers.
Item Metadata
Title |
Testing and analysis of Midply(TM) Shear Wall System
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
2000
|
Description |
The thesis details a six-month period of experimental studies of the structural properties
of the MIDPLY™ Wall System, which has being developed through a three-year testing
program.
The MIDPLY™ shear wall was invented by Dr. Erol Varoglu, formerly with Forintek
Canada Corp. and Prof. S.F. Stiemer (University of British Columbia), US Patent
US5782054: Wood wall structure. The system provides greater lateral resistance to
earthquakes and high winds loads. The name MIDPLY™ refers to its configuration: the
plywood or OSB panel is placed between the studs. The improved performance is due to
this special rearrangement of wall framing components and sheathing used in standard
shear walls. The new fabrication system uses typical building methods and standard
building materials, but a prefabricated production may be desirable to ensure the quality
of the product.
The objective of the project is to establish the proof-of-concept for the MIDPLY™ Wall
System, design and construction method. The structural properties are being developed
through testing of full-scale specimens subjected to monotonic (ramp), cyclic and
dynamic displacement schedules. Several anchoring techniques and hold-down
connectors have been developed and tested. The tests were performed mainly on 2.44m x
2.44m and 1.22m x 2.44m MIDPLY™ shear walls.
In the investigations covered by this thesis, were designed and tested 30 walls and were
primarily studied:
• Alternate hold-down connections that prevent the fracture of the end studs of the
MIDPLY™ wall by using MSR lumber or inverted-triangle hold-downs with
different bolt spacing, bolt diameters, hold-down length and placement along the
stud.
• Alternate hold-down connectors: steel rods and double shear hold-downs.
• The performance of MIDPLY™ walls under pseudo-dynamic tests.
• The performance of MIDPLY™ walls used as insert segments in standard shear
walls.
• The performance of MIDPLY™ walls with openings. Special attention was given to
the connection details between header and MIDPLY™ walls to achieve desired pinor
moment-connection.
• The performance of MIDPLY™ walls affected by shrinkage.
• The performance of repaired MIDPLY™ walls.
One can conclude that, there are many real-life applications of the system, using the
superior structural performance of the MIDPLY™ walls. Thus, future studies will
conduct to a final package of design values needed for structural engineers, architects and
designers.
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Extent |
14018877 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-07-08
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0063774
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
2000-05
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.