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2 edition of Evaluation of creep behavior of structural lumber in a natural environment found in the catalog.

Evaluation of creep behavior of structural lumber in a natural environment

Yuanhua Shen

Evaluation of creep behavior of structural lumber in a natural environment

by Yuanhua Shen

  • 256 Want to read
  • 31 Currently reading

Published .
Written in English

    Subjects:
  • Lumber -- Creep.

  • Edition Notes

    Statementby Yuanhua Shen.
    The Physical Object
    Pagination132 leaves, bound :
    Number of Pages132
    ID Numbers
    Open LibraryOL15380270M

      Load and moisture content (MC) changes are the essential conditions for the mechano-sorptive (MS) creep of wood. An experiment was carried out on poplar to comprehend the mechano-sorptive creep from our point view. To restore the truth of MS creep behavior especially in the first humidifying stage, three well-matched sets of specimens were loaded in Cited by: 6. Creep Stages •Primary Creep: starts at a rapid rate and slows with time. •Secondary Creep: has a relatively uniform rate. •Tertiary Creep: has an accelerated creep rate and terminates when the material breaks or ruptures. It is associated with both necking and formation of .

    A brief review of the literature on moisture-related creep deflection of I-joists is provided. Then field observations are discussed to illustrate practical situations in which I-joists can be exposed to abnormally high moisture conditions and experience problems due to excessive creep deflection. A stochastic creep model previously developed for predicting the creep response of structural lumber was used to evaluate these design "rules-of-thumb" regarding creep. The effect of duration of the applied load and moisture content on the creep factors was by:

    of wood under constant and variable environmental conditions and presents guildelines for time-dependent modeling of creep and the analysis of creep prob- lems by the finite element method. CREEP IN WOOD Analogous to concrete, wood is a special structural material that interacts with the environment to undergo complex changes in its by: General. This article addresses elements of above-grade structural systems in residential construction. The residential construction material most commonly used above grade in North America is light-frame wood; therefore, we'll focus on structural design that specifies standard-dimension lumber and structural wood panels (i.e., plywood and oriented strand-board .


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Evaluation of creep behavior of structural lumber in a natural environment by Yuanhua Shen Download PDF EPUB FB2

The model did not predict creep behavior of structural lumber in a natural environment. The general observations showed that stiffness of the beams has a strong influence on the magnitude of creep strain, and the creep strain closely follows the fluctuations in air by: 9. Created Date: 10/25/ PM.

The model did not\ud predict creep behavior of structural lumber in a natural environment. The general\ud observations showed that stiffness of the beams has a strong influence on the\ud magnitude of creep strain, and the creep strain closely follows. creep behavior for structural lumber The creep behavior of a sample of Douglas fir lumber (2-in by 4-in) was used to develop a creep model including load and environmental effects.

The four element model included moisture and temperature parameters. lumber design strength properties under dry service condi-tions. Ramp-load specimen data generally indicated a lower rate of damage accumulation than did data for constant-load specimens. Creep tests at two low constant-load levels were also performed on large specimens under three environ-mental conditions for a 6-month period.

Those results sug. A creep model that was developed to predict the effects of load and environment, as well as mechano-sorptive effects on primary and secondary creep behaviour, is composed based on the Burger body concept [4].

Springs and dashpots are used to simulate the elastic and viscous components of the stress/strain response. Objectives of this report are to quantify creep in struc­ tural lumber and to compare creep in lumber subjected to tension and compression under constant load.

Ob­ jectives of the larger study are to determine duration­ of-load strength effects and creep effects in bending, tension, and compression under constant Size: KB. This study examined the reliability of wood as a viscoelastic material, based on the premise that timber structural members have two failure modes: (1) serviceability and (2) ultimate collapse.

In the laboratory, full-scale solid sawn lumber and wood-composite I-beams were loaded for days in a controlled by: 5. structural mechanics report tvsm erik hallebrand and wilhelm jakobsson structural design of high-rise buildings erik hallebrand and wilhelm jakobsson structural design of high-rise buildings 1 Differential creep behavior among joists, sheathing material, and connection details in a wood joist floor system can affect the system performance of the assembly over time.

In wood, a natural polymer, creep under imposed stress is a viscoelastic mechanical problem that is generally encountered during processing and utilization. For example, wood creeps both during the drying of solid wood and in the process of the hot-pressing of wood composite panels, as well as during long-term loading of wood members such as roof frames.

creep and transient creep effects can be described by the introduction of harden-ing state variables. Models of time, strain and kinematic hardening are examined as they characterize multi-axial creep behavior under simple and non-proportional loading conditions.

A systematic review and evaluation of constitutive equationsFile Size: 1MB. Lumber Stress Grades and Design Properties David E. Kretschmann and David W. Green Contents Responsibilities and Standards for Stress Grading 6–2 American Lumber Standard Committee 6–2 National Grading Rule 6–3 Standards 6–3 Visually Graded Structural Lumber 6–3 Visual Sorting Criteria 6–3 Procedures for Deriving Design Properties 6–5File Size: KB.

This volume reviews and updates the creep behavior of advanced materials, including ceramic and metal-matrix composites, laminated materials, nanostructured materials, advanced intermetallics, and advanced dispersion strengthened materials. This collection from the TMS Annual Meeting & Exhibition also covers the influence of microstructure on various aspects of creep.

creep strain compared to natural aggregate concrete _____ Keywords: recycled aggregates, natural aggregate, demolition waste, structural concrete, creep behavior _____ I(TRODUCTIO(The conservation of natural resources has become a top priority in all production sectors that target maximizing production and profit (Martinez-Echevarria et al Cited by: 5.

By the definition of ASTM D [1], Standard Specification for Evaluation of Structural Composite Lumber Products, SCL consists of laminated veneer lumber (LVL), parallel strand lumber (PSL), laminated strand lumber (LSL), and oriented strand lumber (OSL).

The day creep behavior of the WPC and HDPE lumber in flexure was characterized and compared for WPC and HDPE lumber (with mm support span) subjected to three levels of creep stress: This specification provides a procedure for testing and evaluating duration of load and creep effects of wood and wood-based materials relative to an accepted duration of load adjustment model.

This specification was created for products that are currently covered by a consensus standard (for example, lumber, structural composite lumber. The static behavior of this material was evaluated in tension, compression, and flexure.

Moment-curvature analysis, utilizing non-linear tensile and compressive constitutive relations, was used to predict the performance and stress distribution of a. Structural Lumber Overview Many Western species share similar performance properties and are grown, harvested and manufactured together.

These products are marked as a species combination to simplify marketing, design and engineering and allow design values to be assigned under a group rather than as individual species. Creep testing has been conducted on compact bone (e.g., Caler and Carter, ; Rimnac et al., ), but the data are less extensive than those from fatigue testing.

Figure 36 shows some unpublished data from the author's laboratory, comparing creep and fatigue of bovine bone loaded in compression using similar test conditions.

Carter and Caler () published an .Wood is a natural material that, as a structural material, demonstrates unique and complex characteristics. Wood’s structural properties can be traced back to the material’s natural composition.

oremost, Fwood is a nonhomogeneous, non-isotropic material, and thus exhibits different structural.Rakesh Gupta: Associate Editor. Evaluation of creep behavior of structural lumber in a natural environment. Forest Products Journal 46(9) Gupta, R. and Vatovec, M.

Evaluation of dahurian larch in mechanical connections. Forest Products Journal 46(9)