Whitewood–limecrete joints of supplementary stud-slip angles

This paper describes longitudinal shear tests on limecrete slabs connected to whitewood glulam joists by means of inclined iroko studs fastened to the joists by transverse ramin dowels. Seven single-stud joints of stud-slip angles arranged in supplementary pairs of 45 and 135°, 60 and 120°, 75 and 105°, and 90° were tested to failure. For any given stud-slip angle the test data show consistency in shear capacity, but variation in working slip stiffness. Joint shear capacity changed dramatically (46·7 kN at 75° to 12·5 kN at 105°) in proceeding from acute to obtuse stud-slip angles, but varied modestly within each of the acute and obtuse regimes. Joints with two studs at 45° and 135° stud-slip angles in V and Λ layouts were also tested, giving force-slip plots (including ductility) that match the superposition of plots from the constituent single-stud joints. After testing, the joints of acute stud-slip angles exhibited residual features including narrowing and flexing of the stud's shank near the slab-joist interface, slip of the stud within the joist with associated double shearing of the dowel, and shearing of the stud's head overhang off the shank. For obtuse stud-slip angles, pronounced residual flexing of the stud in the slab was noted.