Long-term load performance of hardboard I-beams by J. Dobbin McNatt

Cover of: Long-term load performance of hardboard I-beams | J. Dobbin McNatt

Published by U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory in [Madison, Wis.] .

Written in English

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  • Wooden beams.,
  • Girders.

Edition Notes

Book details

StatementJ. Dobbin McNatt, Michael J. Superfesky.
SeriesResearch paper FPL -- 441.
ContributionsSuperfesky, Michael J., Forest Products Laboratory (U.S.)
The Physical Object
Pagination10 p. :
Number of Pages10
ID Numbers
Open LibraryOL18037058M

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Long-Term Load Performance of Hardboard I-Beams J. Dobbin McNatt, Technologist and Michael J. Superfesky, Engineer Increasing costs and decreasing availability of larger, solid-sawn wood joists for roof and floor systems have encouraged the development of prefabricated beams of various types.

Nelson (15)2 has stated that it is possible to. Additional Physical Format: Online version: McNatt, J. Dobbin. Long-term load performance of hardboard I-beams. [Madison, Wis.]: U.S. Dept.

of Agriculture, Forest. Long-term load performance of hardboard I-beams / By J. Dobbin. McNatt, Michael J. Superfesky and Forest Products Laboratory (U.S.) Abstract "November "--P. [1]Distributed to depository libraries in graphy: p.

Mode of access: Internet. Department o Long-Term Load Agnculture Performance of Forest -s Service Hardboard I-Beams Products Laboratory' Research J. Dobbin McNatt, Technologist Paper and - FPL Nvb adfyc 1 Michael J. Superfesky, November Engineer #VPc, I3 Introduction.

the long-term-load performance of structural composite members, primarily I-beams, made with plywood, oriented strandboard, and waferboard. Earlier work focused on hardboard in similar applications. Studies have also evaluated the load-duration behavior of wood-base panels alone.

Much of this work was designed, at least in part, to. Twelve-foot and 6-foot Long-term load performance of hardboard I-beams book with webs of two different hardboard materials and plywood were subjected to constant loads in three different humidity environments.

Af hours of test, the performance of the hardboard-webbed I-beams appears to be at least comparable to that of I-beams with plywood webs. were used in designing three experimental I-beams that spanned 30 feet with a 2-foot overhang on each end.

They were constructed with web material of hardboard and flanges of 2- by 4-inch lumber. The design stress values of the hardboard were based on a factor of for load duration, a statistical consi­. observed similar creep behavior between I-beams wi th particleboard and hardboard to I-beams with lumber webs.

Leichti and Tang () tested I. McNatt, J. D.; Superfesky, M. Long-term load performance of hardboard I-beams. USDA Forest Service Research Paper FPL, Madison Mårtensson, A. Tensile behaviour of hardboard under combined mechanical and moisture by:   The tensor polynomial strength theory for anisotropic materials was coupled with finite-element analyses to predict the ultimate load capacity of several wood-composite I-beams.

Small-specimen tests with the constituent materials provided elastic constants for the finite-element computations and ultimate strengths for development of strength by: 5.

term load and long term load, the assumption that the truss theory is based on the actual behavior of reinforced concrete beams loaded by bending until failure cannot be confirmed, because in the tensioned zone of the beam, the tensioned member of the truss cannot be formed, so it is necessary to take into consideration the active forces of.

The long-term load performance of hardboard- and plywood-webbed I-beams with Douglas-fir laminated veneer lumber flanges was investigated (Superfesky and Ramaker ; McNatt and Superfesky ). HARDBOARD-WEBBED I-BEAMS. SUBJECTED TO SHORT-TERM LOADING.

1 2. By MICHAEL J. SUPERFESKY, Engineer. and. TERRY J. RAMAKER, Engineer. Forest Products Laboratory, 3 Forest Service U.S. Department of Agriculture. INTRODUCTION. The performance of structural I-beams and box beams is highly dependent on the shear.

Gowda et al. () reported results of long-term bending creep tests on glulam beams at low load levels under natural conditions. The creep data collected from tests on eight separate glulam. The spreading process is performed on special tables with smooth hardboard, laminate or melamine painted surfaces (see Fig.

).The surface is supported by a steel construction capable of withstanding the load of a fully equipped spreader. The tables are available in different widths (– cm) and the width of the table must be at least 20 cm wider than that of the spread. n) _ 0, where the failure surface is known to be f (z, zZ, zn) = 0.

CREEP ANALYSIS Specimen testing Traditional solid sawn lumber and wood-composite I-beams were long-term loaded in bending at one-third of the average maximum static bending strength for the lumber and I Cited by: 5.

SectionLong-Term Loading. Under long-term loading, the expected (average) deflection will be times the immediate deflection due to the long-term component of the design load for seasoned (dried) lumber and times the immediate deflection for unseasoned (green) lumber.

Long-term loading effect of moisture Content. findings from two EU comprehensive research projects concerning the performance of I-beam structures made from re-engineered timber flange and wood based composite web. The objectives of the project are to 1) develop a reliable test method for determination of short- and long-term performance of composite I-beams, 2) determine short-and long-term.

A method for determining the structural performance of wood based panels under edgewise bending load has been developed. The developed semi-size test method for the edgewise bending load can be used for the harmonised grades of PB, MDF, OSB and PW without lamination for a panel thickness of 18 mm.

(2) The test results were consistent and Cited by: 4. In this study, Japanese cedar (Cryptomeria japonica (L. f.) D. Don) harvested from a plantation in Taiwan was used to develop built-up beams using self-tapping screws as metal connectors and resorcinol formaldehyde resin as glue to assemble components based on various assembly configurations.

Results showed that adding glue provided flexural rigidity, whereas assembly Author: Tsai-Po Chien, Te-Hsin Yang, Feng-Cheng Chang. You must determine the snow load for your region. This information is found in the code book. The snow load is treated as a live load when you use AWC's tables.

If your code book says your snow load is 40 psf, then you use the 40 psf live load rafter table. The fact that snow loads only act part of the year has been used to create the rafter.

Sensitivity of the load–deflection results with respect to different parameters for group No. 4 of castellated I beams tested by Harte and Baylor [40] (±20% variability in the mechanical. Utilização de Derivados da Madeira em Habitações Pré-fabricadas Produzidas no Brasil W ood Composite I-beams: a literature review.

Long-term Load Performanc e of Hardboard I. This paper reviews the available literature on the state of the art of prefabricated wood composite I-beams.

The results of analytical and experimental investigations illustrate the effects of materials, joint, geometry, and environment on the short- and long-term performance of I-beams. LOADS ON BUILDINGS AND STRUCTURES Hardboard, per 10 mm thickness Live load is the load superimposed by the use or occupancy of the building not including the environmental loads such as wind load, rain load, earthquake load or dead load.

BEAM-COLUMNS SUMMARY: • Structural members subjected to axial compression and bending are known as beam columns. • The interaction of normal force and bending may be treated elastically or plastically using equilibrium for the classification of cross-section.

• The behaviour and design of beam-columns are presented within the context of members subjectedFile Size: KB. Lumber Yard, Hardwood, wide plank flooring, reclaimed siding, moulding, cedar, plywood, pine, decking, railing, Mohawk, timbers, wood slabs, veneers.

Load beams are roll formed with /8” step along the top inside edge for holding load support components such as pallet supports or wire decks. Capacities are for uniformly distributed product load plus dead load per pair of beams (dead load = weight of beams), actual capacities may vary for seismic calculations.

Audio Books & Poetry Community Audio Computers, Technology and Science Music, Full text of "Density, modulus of elasticity, creep, and durability of hardboard:. Monitoring the long-term behavior of civil structures is of great importance for damage prevention and design improvement.For prestressed (PT) concrete structures, it has long been recognized that the loss in tension of prestressing tendons over time is one major factor affecting their long-term deflection and service by: 8.

showed that hardboard-webbed I-beams exhibit linear behavior to a load level equivalent to 60% of the rail shear strength of the hardboard web. As with the othe r. Abstract. As described in earlier papers, wood is an oriented composite of remarkable complexity.

Connections between the structural components range from the numerous strong hydrogen bonds in the crystalline regions of the microfibrils through a limited number of covalent bonds between the many-branched lignin and adjacent carbohydrate polymers (probably hemicellulose) to the Cited by: 3.

The Lateral stability of equal-flanged aluminum-alloy I-beams subjected to pure bending / (Washington D.C.: National Advisory Committee for Aeronautics ;, A handy book for the calculation of Strains in Girders and similar structures, Long-term load performance of hardboard I-beams / ([Madison, Wis.]: U.S.

Dept. of Agriculture. Novel bamboo I-beams fabricated from bamboo oriented strand boards as structural members were investigated.

Bending tests were performed to determine the stiffness and strength properties of bamboo I-beams. The results showed that the stiffness and strength properties exceeded the requirements of APA EWS Performance-Rated I-joist in PRICited by: 1. A primary aim of structural engineered timber has always been to use materials more efficiently.

With EWPs the wood fibre is used with increased efficiency exemplified by adhesively bonded structural I-beams; see Fig. A × 70 beam, with mm-thick flanges and mm-thick web, involves only one-third the wood fibre of a solid member of Cited by: 3.

This set of conference proceedings focusses on topics related to integrating existing knowledge together with more recent contributions on service life & durability of construction materials, components, and assemblies.

Papers presented are arranged under the following topics: service life prediction of concrete structures; studies on strength & durability of concrete; corrosion of 5/5(1).

Predicting performance of hardboard in I-beams / (Madison, Wis.: U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, ), by Terry J. Ramaker and Michael D. Davister (page images at HathiTrust; US access only). The reinforcement can be untensioned, or it can be in the form of prestressing tendons.

It is also suitable for gluing onto the outside of a structure to improve flexural or shear performance. This book provides up-to-date research results to give engineers confidence in their design methods. CWC book says 18'10" and 16'1" respectively.

Now with wall framing the span will work by code at 2 x 10, its near the limit, judgement call, I would bump up if at all possible. Code is limiting to 1/ span deflection (a 15' span would deflect 1/2" at design load). I-beams or I-joists are perfect for builds requiring wide spans with fewer load bearers.

Its high strength to weight ratio make it perfect for use in floor joists and roof trusses, with spans easily lifted up scaffolding by a single person. Available in lengths of more than 13m, these products offer great versatility in creating open, expansive.

Allow a minimum of 3" clearance between pallet (s) and uprights. For example, two 48" wide pallets would require " long load beams. Two beams are needed for each shelf. Capacities based on evenly distributed load. Priced per beam. Please note: Model # I includes 4-pin connector.

All capacities are based on non-seismic instatllation.This paper discusses the long-term behavior of a series of highly-loaded, spun concrete pole specimens prestressed with carbon fiber-reinforced polymer (CFRP) tendons, which were subjected to outdoor four-point bending creep tests since in the frame of collaboration with the Swiss precast concrete producer, SACAC (Società Anonima Cementi Armati Centrifugati).Cited by: 4.22 TIMBER BEAMS SUBJECTED TO LONG – TERM LOADING /3 PAGES 21 — 26 America and Europe.

But a large examination did not confirm the markedly smaller value of a long-term load coefficient. Hoffmeyer and Fridley dealt with the effect of changes in moisture on creep and the time of failure in and (Koželouh ).

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