Building Design and Construction Handbook - Merritt - Ventech!

10.74 SECTION TEN
FIGURE 10.20 Crown connections for arches: (a) for arches with slope of 4:12
or greater, the connection consists of pairs of back-to-back shear plates with through
bolts or threaded rods counterbored into the arch; (b) for arches with flatter slopes,
shear plates centered on a dowel may be used in conjunction with tie plates and
through bolts; (c) and (d) hinge at crown.
For glued-laminated decking, two or more pieces of lumber are laminated into
a single decking member, usually with nominal thickness of 2, 3, or 4 in. Other
thicknesses may also be available. There are no consensus standards for gluedlaminated
decking. Decking manufacturers should be consulted for design information.
Solid-sawn decking usually is fabricated with edges tongued and grooved, shiplap,
or groove cut for splines, to provide transfer of vertical load between pieces.
The decking may be end-matched, square end, or end-grooved for splines. As indicated
in Fig. 10.22, the decking may be arranged in various patterns over supports.
In Type 1, the pieces are simply supported. Type 2 has a controlled random
layup. Type 3 contains intermixed cantilevers. Type 4 consists of a combination of
simple-span and two-span continuous pieces. Type 5 is two-span continuous.
In Types 1, 4, and 5, end joints bear on supports. For this reason, these types
are recommended for thin decking, such as 2-in.
Type 3, with intermixed cantilevers, and Type 2, with controlled random layup,
are used for deck continuous over three or more spans. These types permit some
of the end joints to be located between supports. Hence, provision must be made
for load transfer at those joints. Tongue-and-groove edges, wood splines on each
edge of the course, horizontal spikes between courses, and end matching or metal
end splines may be used to transfer shear and bending stresses.
In Type 2, the distance between end joints in adjacent courses should be at least
2 ft for 2-in deck and 4 ft for 3- and 4-in deck. Joints approximately lined up