Open AccessAnalysis of the stress state at the double-step joint in heavy timber structures
Author(s) -
José Ramón Villar-García,
Pablo Vidal-López,
José Crespo,
Manuel Guaita Fernández
Publication year - 2019
Publication title -
materiales de construcción
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.539
H-Index - 30
eISSN - 1988-3226
pISSN - 0465-2746
DOI - 10.3989/mc.2019.00319
Subject(s) - structural engineering , truss , joint (building) , shear (geology) , reduction (mathematics) , carpentry , beam (structure) , shear strength (soil) , shear stress , engineering , materials science , composite material , mathematics , geology , civil engineering , soil science , soil water , geometry
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.