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The Study on Bonding Property and Aging Resistant Performance of Glulam Members

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Tutor: SunYouFu
School: Nanjing Forestry University
Course: Wood Science and Technology
Keywords: glulam members,bonding property,accelerated aging method,aging resistantperforma
CLC: TS653.3
Type: Master's thesis
Year:  2013
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Abstract:
This paper mainly discusses and studies bonding property and aging resistant performanceof glulam members by several accelerated aging methods£ºAccording to the results of the shearing strength and wood failure of specimen£¬wood failurereaches to91%£¬average shear strength of dry condition is about8.27Mpa£»looking for the wetcondition£¬wood failure is about90%£¬average shear strength is more than4.0Mpa£®The resultsindicate that shear strength under dry and wet conditions could meet the requirements of GB50005£­2003£¬and the relationship of shear strength and wood failure percentage(WFP) meetsthat of ISO/DIS12578£®The delamination testing methods are conducted according toGB/T26899-2011andISO/DIS12580£®It shows that the values of bonding strength delaminating of glulam membersare less than5%after water soak and water boiling delamination testing£®After2cycles£¬thesingle layer of the maximum delamination is about9%£¬the degree of delamination of thespecimen with vacuum£­pressure delamination testing is slightly smaller than the other twoways£®According to four kinds of manual accelerated aging methods£¬including ASTMD1037£¬BSEN1087£­1£¬CAN/CSA£­0188£¬ASTM D3434following conclusions are obtained£ºAfter aging processing£¬the decline of shear strength which is the most significant is between27.8%and44.9%£®On the basis of this conclusion£¬it can be advised to take the shear strength asone important factor for aging resistant performance of glulam member£®Performances of glulam members which are treated by BS EN1087£­1and ASTM D1037accelerated aging methods are alike somehow£®BS EN1087£­1accelerated aging processingtakes less hours£¬so the previous one is much better in application for its time saving£®The correlations are all significant at0.01level for glulam members which treated byASTMD1037£¬BS EN1087£­1and CAN/CSA£­0188accelerated aging method as the thicknessswelling being more correlative than the thickness swelling of24hours¡¯ water absorption£®After ASTM D1037accelerated aging processing£¬MOR£¬MOE and shear strength of glulammembers fit exponential and logarithm curve better£®After BS EN1087£­1accelerated agingprocessing£¬for MOR£¬MOE and shear strength£¬logarithm curve and power curve fit better£®AfterCAN/CSA£­0188accelerated aging processing£¬the power curve fit of MOR£¬MOE and shearstrength is significant at0.05level£¬the logarithm curve fit of MOR and MOE is significant at0.05level£®The curve fits good£®
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