Show simple item record

dc.contributor.authorShowalter, Karen L.en_US
dc.date.accessioned2014-03-14T21:31:30Z
dc.date.available2014-03-14T21:31:30Z
dc.date.issued1985-07-08en_US
dc.identifier.otheretd-03122013-040014en_US
dc.identifier.urihttp://hdl.handle.net/10919/41539
dc.description.abstract

Two sizes (2x4 and 2x10) and two grades (2250f-1.9E and No. 2 KDl5) of Southern Pine lumber having three different test span lengths of 30, 90 and 120 inches were tested in tension parallel-to-grain. Results obtained from the tests indicated that the tensile strengths of the 30-inch test specimens were significantly higher than the tensile strengths of the 90- and 120-inch test specimens. A tensile strength-length effect model was developed for generating tensile strength values of lumber taking the length effect into consideration. The model generates tensile strength values for lumber longer than 30 inches in multiples of 30 inches, ie. 60-, 90- 120-inch lengths. The two sizes and two grades of Southern Pine lumber formed the data base for developing the model.

The tensile strength-length effect model utilized an MOE variability model which generated serially correlated MOE's along 30-inch segments for a piece of lumber using a second order Markov model. The segment MOE values were then used in a first-order Markov model to generate serially correlated tensile strength residuals for each 30-inch segment. The segment MOE values and the segment tensile strength residuals were then inputted into a weighted least squares regression to obtain the tensile strength parallel-to-grain for each 30-inch segment. The tensile strength of the generated piece of lumber was then determined using the weakest-link concept; the minimum segment tensile strength value was selected as the tensile strength of the generated piece of lumber.

en_US
dc.format.mediumBTDen_US
dc.publisherVirginia Techen_US
dc.relation.haspartLD5655.V855_1985.S548.pdfen_US
dc.subjectWooden_US
dc.subject.lccLD5655.V855 1985.S548en_US
dc.titleThe effect of length on tensile strength parallel-to-grain in structural lumberen_US
dc.typeThesisen_US
dc.contributor.departmentAgricultural Engineeringen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineAgricultural Engineeringen_US
dc.contributor.committeechairWoeste, Frank E.en_US
dc.contributor.committeememberDiehl, Kenneth C.en_US
dc.contributor.committeememberDillaha, Theo A. IIIen_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-03122013-040014/en_US
dc.date.sdate2013-03-12en_US
dc.date.rdate2013-03-12
dc.date.adate2013-03-12en_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record