Experimental and numerical studies of the stress state at the reverse step joint in heavy timber trusses

Villar-García, José Ramón; Crespo, José; Ignacio, M; Fernández, Manuel Guaita

doi:10.1617/s11527-018-1144-9

Cited by 13 publications

(25 citation statements)

References 23 publications

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“…The presence of friction is also significant in timber couplings, pulleys or bearings for conveyor belts, rolling mills and other kinetic systems in agroindustrial facilities and farm equipment. Several works (Villar et al, 2007(Villar et al, , 2008(Villar et al, , 2018(Villar et al, , 2019Koch et al, 2013;Aira et al, 2016) show the importance of knowing these coefficients in order to obtain both a deeper knowledge of the load transmission mechanisms and a suitable numerical simulation in timber joints. This is because load transmission is partially caused by friction forces, especially in the case of carpentry joints.…”

Section: Introductionmentioning

confidence: 99%

Determination of the friction coefficients of chestnut (Castanea sativa Mill.) sawn timber

et al. 2020

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A b s t r a c t. This work provides the values of both the static and the kinetic friction coefficients for chestnut (Castanea sativa Mill.) of Spanish origin. Knowledge concerning these coefficients has its main application in the study of agroindustrial structures and machinery with timber members in contact. This determination was developed taking into account the timber anisotropy to establish surfaces and directions of slipping. A modified direct shear test device was used to conduct the tests and reproduce the tribological system. This procedure was functional and reliable and considered suitable for standardizing the friction measurement between timber surfaces, since this device is widely distributed in geotechnical and materials laboratories and the European codes do not specify a procedure or device to carry it out. The average values obtained were 0.46 for the static coefficient and 0.33 for the kinetic one, without considering the surfaces and directions of slipping. These values ranged between 0.36 and 0.55 for the static friction coefficient and between 0.28 and 0.39 for the kinetic friction coefficient depending on the direction considered and also taking into account the anisotropy of the timber. A good correlation was obtained between both coefficients, thus allowing for the estimation of the kinetic coefficient from the static one.K e y w o r d s: wood, mechanical properties, friction coefficient, direct shear test

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Section: Introductionmentioning

confidence: 99%

Determination of the friction coefficients of chestnut (Castanea sativa Mill.) sawn timber

et al. 2020

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“…The joint design requires verifying the compression stresses in the notches' surfaces considering the angle between the stress and grain, as well as checking the shear stresses, i.e., checking the step depth (t) and the length (a) of the shearing path, Figure 3, as indicated in Villar et al (5), for each step. Besides, two reduction coefficients must be considered.…”

Section: Theoretical Design Of the Jointmentioning

confidence: 99%

“…For perpendicular direction to the fibre, the elastic properties values can be assumed as the average of those corresponding to the radial and tangential ones, especially for glulam beams due to the layout of the planks. This simplification is acceptable for this type of modelling (3,5,7,17,22,23) and perpendicular isotropy lowers the computational cost, as some authors point out (22). Tests were developed within the elastic range.…”

Section: Description Of the Numerical Simulation Modelmentioning

confidence: 99%

“…Plasticity will not be reached, as it will be checked in the test results, and corroborated by the stresses observed at failure, which will be later detailed at the section 4. The linear elastic constitutive law of the timber is widely accepted by the scientific community while analysing timber joints within the conditions here exposed (3,5,17,(24)(25)(26).…”

Section: Description Of the Numerical Simulation Modelmentioning

confidence: 99%

“…Regarding the boundary conditions, the model considered the real test conditions: load, the anchored with respect to traction and the support of the tie-beam on a timber block. The model simulated the friction between contact surfaces; detailed explanations of the method followed in the friction simulation is described in previous works (3)(4)(5).…”

Section: Description Of the Numerical Simulation Modelmentioning

confidence: 99%

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Analysis of the stress state at the double-step joint in heavy timber structures

et al. 2019

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The double-step joint is among the most frequently used layouts, within carpentry joints, for transmitting higher forces that would allow a single notch. They are especially effective in heavy timber structures. Nowadays, computer-aided manufacturing is being used more often, demanding further progress in its understanding. The conventional design of these joints is conducted by using simplifying assumptions, in particular regarding the shear stress distribution. This is overcome by the use of strength reduction coefficient, which is currently under study. Numerical simulation and experimental tests were carried out with heavy timber cross-sections for rafter to tie-beam truss joint. They were manufactured in glue-laminated timber owing to the large cross-sections tested. Experimental load-strain and load-displacement diagrams were compared with numerical results. This allowed observing the great shear stress concentration produced in the failure by shear crack, which suggests the application of conservative shear strength reduction coefficients.

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Reinforcement of Traditional Carpentry Joints

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Verbist

Tsakanika

2021

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Experimental and numerical studies of the stress state at the reverse step joint in heavy timber trusses

Cited by 13 publications

References 23 publications

Determination of the friction coefficients of chestnut (Castanea sativa Mill.) sawn timber

Determination of the friction coefficients of chestnut (Castanea sativa Mill.) sawn timber

Analysis of the stress state at the double-step joint in heavy timber structures

Reinforcement of Traditional Carpentry Joints

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