A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Load-to-grain angle dependence of the embedment behavior of dowel-type fasteners in laminated veneer lumber
Load-to-grain angle dependence of the embedment behavior of steel dowels in laminated veneer lumber, as a consequence of the anisotropic material behavior of wood, is experimentally investigated in this study. As a novel issue, in addition to the stress dependence, the displacement path of the dowel depend- ing on the load-to-grain angle, is discussed. Full-hole embedment tests of screw-reinforced LVL speci- mens up to dowel displacements of two times the dowel diameter and thus, representative for highly ductile dowel connections were conducted. Tests were performed with unconstrained lateral displace- ment boundary conditions of steel dowels with a diameter of 12 mm and 16 mm. Surface deformations were monitored with a full-field deformation measurement system. Increasing the load-to-grain angle caused reduced quasi-elastic limits and loading stiffness. However, for load-to-grain angles of 60 and higher, a pronounced displacement-hardening effect, leading to high embedment stresses at large dowel displacements, was observed. For the investigated dowel diameters, surface strains and plastic deforma- tions around the dowel indicate an almost dowel diameter independent load bearing area, which might explain higher nominal embedment stresses and consequently a more pronounced hardening effect of the smaller dowel diameter. Dowel displacements perpendicular to the initial loading direction, i.e., non- linear displacement paths of the dowel, were related to the anisotropic stiffness of wood and densifica- tion effects close to the dowel. The established experimental dataset was compared to current European timber engineering design equations and could serve as input to analytical and numerical models of dowel connections.
Load-to-grain angle dependence of the embedment behavior of dowel-type fasteners in laminated veneer lumber
Load-to-grain angle dependence of the embedment behavior of steel dowels in laminated veneer lumber, as a consequence of the anisotropic material behavior of wood, is experimentally investigated in this study. As a novel issue, in addition to the stress dependence, the displacement path of the dowel depend- ing on the load-to-grain angle, is discussed. Full-hole embedment tests of screw-reinforced LVL speci- mens up to dowel displacements of two times the dowel diameter and thus, representative for highly ductile dowel connections were conducted. Tests were performed with unconstrained lateral displace- ment boundary conditions of steel dowels with a diameter of 12 mm and 16 mm. Surface deformations were monitored with a full-field deformation measurement system. Increasing the load-to-grain angle caused reduced quasi-elastic limits and loading stiffness. However, for load-to-grain angles of 60 and higher, a pronounced displacement-hardening effect, leading to high embedment stresses at large dowel displacements, was observed. For the investigated dowel diameters, surface strains and plastic deforma- tions around the dowel indicate an almost dowel diameter independent load bearing area, which might explain higher nominal embedment stresses and consequently a more pronounced hardening effect of the smaller dowel diameter. Dowel displacements perpendicular to the initial loading direction, i.e., non- linear displacement paths of the dowel, were related to the anisotropic stiffness of wood and densifica- tion effects close to the dowel. The established experimental dataset was compared to current European timber engineering design equations and could serve as input to analytical and numerical models of dowel connections.
Load-to-grain angle dependence of the embedment behavior of dowel-type fasteners in laminated veneer lumber
2016
Article (Journal)
English
| British Library Online Contents | 2016
| British Library Online Contents | 2016
Embedment Strength of Cross-Laminated Timber for Smooth Dowel-type Fasteners
| DOAJ | 2019