Prediction of bending properties for structural glulam using optimized distributions of knot characteristics and laminar MOE

Lee, Jun-Jae; Park, Joo-Saeng; Kim, Kwang Mo; Oh, Jung-Kwon

doi:10.1007/s10086-005-0704-0

Cited by 20 publications

(11 citation statements)

References 5 publications

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“…The key mechanical properties used for correlation are the characteristic tension strength parallel to the grain, f t,0,l,k , and the mean MOE in tension parallel to the grain, E 0,l,mean. In the case of glulam it is both difficult and costly to perform a sufficient large number of full-scale failure tests to give statistical values for a determined laminate combination, and thus modeling prediction and estimation are often considered [7]. For that reason, a reference element was considered in order to minimize the number of tests and to maximize the amount of information collected from the test campaign.…”

Section: Introductionmentioning

confidence: 99%

Glulam Mechanical Characterization

Sousa

Branco

Lourénço

2012

MSF

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The glued laminated timber (glulam) mechanical properties may be evaluated through the determination of the key mechanical properties of the lamellae that compose that element. Simple bending and tension parallel to the grain tests were performed in order to assess the strength class of three glulam elements. Regarding the bending tests, 8 samples were taken from a glulam beam and assessed. Values for the resistant bending tension and both local and global modulus of elasticity were obtained. For the tension parallel to the grain tests, a total of 120 samples were assessed. The samples were divided regarding the structural element from where they were extracted as well to the type of failure mode found in the tests. The values of the lamellae properties were then used for determination of the properties of the glulam material. The data gathered from the tests was assessed statistically and concluded that the mechanical properties of the glulam elements did not fulfill the required parameters of the normative requirements.

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Section: Introductionmentioning

confidence: 99%

Glulam Mechanical Characterization

Sousa

Branco

Lourénço

2012

MSF

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“…By repetition, 10 ideal datasets were simulated. The 100 tensile strength data were generated by inverse transform method [15]. Equation (1) shows how to generate the tensile strength.…”

Section: Dataset Preparation and Simulating Tensile Strengthmentioning

confidence: 99%

Sensitivity of censored data analysis to determine the characteristic value of structural timber

et al. 2020

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In structural timber tests, unintended failure mechanisms occur frequently in specimens and their results are called censored data. There are two censored data analysis: censored maximum likelihood estimation (CMLE) and Kaplan-Meier (KM) method. In this study, the precision of the censored data analysis was investigated to determine the characteristic value, 5th percentile value, of the structural timber. The results show that (1) the 5th percentile value was underestimated by ordinary data analysis methods; maximum likelihood estimation (MLE) and Order statistics. (2) CMLE with 30% lower tail censored data and KM method provided much more precise 5th percentile value. (3) The amount of under-measurement (5 MPa, 10 MPa, and 15 MPa in this simulation study) did not show significant effect on the 5th percentile determination in CMLE and KM method, but the proportion of censored data (percentage of unintended failure specimen; 10%, 20%, 30%, and 40%) affected the determination of 5th percentile value. (4) CMLE with 30% lower tail censored data and KM method showed good agreement in case that the data included unintended failure data up to 20%.

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“…Besides the visual grade, the code includes other grading methods such as ultrasonic and transverse vibration nondestructive methods. The benefits from nondestructive testing (NDT) of laminae on the glulam properties can be seen in several studies (Lee et al 2005, Yang et al 2008, Fugimoto et al 2010). These methods can play an important role in improving the quality and reliability of tropical hardwood as an engineering material.…”

Section: Introductionmentioning

confidence: 97%

Theoretical and experimental deflections of glued laminated timber beams made from a tropical hardwood

Teles

Menezzi

Souza

et al. 2013

Wood Material Science & Engineering

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Nondestructive testing (NDT) can play an important role in improving the quality and reliability of tropical hardwood as an engineering material. By means of these methods, the stiffness of the material can be determined and the information used to improve its structural performance. Although, it is a usual approach for qualifying the material used to manufacture engineered wood products made mainly from softwoods, it is not so common for tropical hardwoods. Additionally, the lack of information regarding properties of glulam beam made from these kinds of wood is evident. In this context, the paper aimed at evaluating the theoretical and experimental deflection of glulam beams made from the Brazilian hardwood lourovermelho (Sextonia rubra). Initially, the stiffness of each lamina was determined nondestructively using transverse vibration method (E dtv ), which has been demonstrated to be the most suitable method for this wood species. Then, ten 5-lamina glulam beams were assembled according to descending lamina E dtv values. The experimental evaluation was performed using a four-point bending schedule. In general, the theoretical values of deflection were 2% higher than the experimental ones. The transverse vibration showed to be a suitable method to both measure lamina stiffness and predict glulam beam deflection.

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Prediction of bending properties for structural glulam using optimized distributions of knot characteristics and laminar MOE

Cited by 20 publications

References 5 publications

Glulam Mechanical Characterization

Glulam Mechanical Characterization

Sensitivity of censored data analysis to determine the characteristic value of structural timber

Theoretical and experimental deflections of glued laminated timber beams made from a tropical hardwood

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