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Startlink building system and connections for fibre reinforced polymer structures
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Zafari, Behrouz (2012) Startlink building system and connections for fibre reinforced polymer structures. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b2680900~S1
Abstract
The research presented in this thesis examines various aspects on connections and
joints in Pultruded Fibre Reinforced Polymeric (PFRP) structures. The work is
divided into two experimental investigations on the determination of pin-bearing
strength and the characterisation of dowel connections and joint for the Startlink
Lightweight Building System (SLBS).
To support the development of a strength formula for bearing resistance in bolted
connections two pin-bearing strength test series were conducted to study the effects
of load orientation and hot-wet conditioning. The limitations of existing standard test
methods are exposed from a critical review to show that they do not specify the need
for a clearance hole, the range of bolt diameters and PFRP thicknesses found in
practice. Because the size of tension coupons is found to be too big to be cut from
standard structural profiles an alternative test method, having a smaller coupon size,
is needed for every pin-bearing strength to be quantified by testing. Reported in this
thesis are test results using an in-house test method that requires a maximum blank
coupon of 100 mm × 125 mm. Characteristic strength are determined using Annex
D7 of Eurocode 0. Pin-bearing strengths for load orientations of 0, 5, 10, 20, 45 and
90o, to the direction of pultrusion are obtained for a web material taken from a
standard wide flange section of 9.53 mm thick. In the test matrix there were four
sizes of pin diameter from 9.7 mm to 25.4 mm and a minimum clearance hole of 1.6
mm. The in-house test method is shown to satisfactorily determine pin-bearing
strength. Another finding from this study is that the Hankinson formula cannot be
applied to establish pin-bearing strength at any orientation on knowing the two
characteristic strengths at 0o and 90o. To characterise the effect of hot-wet conditioning 0, 45 and 90o specimens were immersed under water for 3000 hours at
40° C. It is found that the average reduction in characteristic strength is in the range
of 18 to 31%. The extent of strength reduction is found to be independent of pin size,
except when the diameter is 25.4 mm.
The second experimental investigation is for fact finding strength tests towards the
application of PFRP dowelling as a method of connection in SLBS. This innovative
building system has been engineering for the execution of a FRP house that meets
the requirements for code level 6. A series of static coupon-sized tests were
conducted to determine the minimum resistance of dowel connections similar to
those used in the Startlink house. These results were used to verify the structural
engineering design calculations. Another sub-assembly test configuration was used
to determine the moment-rotation characteristics of joint details for the portal frame
in the SLBS house. Four different beam-to-column joints with dowel connections,
and with and without adhesively bonded connections, were statically loaded so that
their rotational stiffnesses and modes of failure could be determined. The main
conclusions from this study are that:
-- all joints had adequate strength against the design ULS moment;
-- only when the joint had adhesive bonding between the overlapping beam and
column members does the rotational stiffness approach the design rigid
condition;
-- when clearance holes are present the rotational stiffness is low and applying
adhesive bonding around the dowels cannot remove this structural limitation.
Item Type: | Thesis (PhD) | ||||
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Subjects: | T Technology > TA Engineering (General). Civil engineering (General) | ||||
Library of Congress Subject Headings (LCSH): | Fiber-reinforced plastics, Joints (Engineering), Pultrusion, Fiber-reinforced plastics -- Testing, Strength of materials | ||||
Official Date: | November 2012 | ||||
Dates: |
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Institution: | University of Warwick | ||||
Theses Department: | School of Engineering | ||||
Thesis Type: | PhD | ||||
Publication Status: | Unpublished | ||||
Supervisor(s)/Advisor: | Mottram, J. Toby (James Toby), 1958- | ||||
Sponsors: | Technology Strategy Board (Great Britain) | ||||
Extent: | [27], 263 leaves : illustrations, charts. | ||||
Language: | eng |
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