US 4,413,459 AGranted

Laminated wooden structural assembly

AssigneeBoise Cascade Corporation

InventorAlan L. Lambuth

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Abstract

A laminated wooden structural assembly is disclosed comprising at least one multi-ply wooden web member formed of a pair of spaced outer layers and at least one inner core layer bonded between the outer layers, and at least one wooden flange member arranged adjacent one longitudinal edge portion of the web member. The web and flange members are connected by joint means including a straight machine tapered longitudinal slot contained in one surface of the flange member, and a machine tapered longitudinal edge portion of the web member that is inserted with a friction fit into the slot. Each inner core layer of the web member is arranged with its grain direction extending toward the longitudinal edge portion of the web member, the outer layers being arranged with their grain directions extending parallel to the flange member. The flange member is arranged with its grain direction extending in a direction longitudinally and parallel with the grain direction of said web outer layers.

Claims8

Dependent claims

A laminated wooden structural assembly, comprising

(a) at least one multi-ply generally rectangular web member including a pair of spaced parallel outer layers, and at least one inner core layer bonded between said outer layers, each of said layers being formed of wood;
(b) at least one wooden flange member arranged adjacent one longitudinal edge portion of said web member, the longitudinal axis of said flange member being parallel with said one longitudinal edge portion of said web member;
and
(c) means rigidly connecting said web and flange members, said connecting means including
(1) a longitudinal slot contained in the surface of said flange member adjacent said web member;
(2) the longitudinal edge portion of said web member being inserted with a friction fit within said longitudinal slot;
and
(3) adhesive means bonding together the mating surfaces of said longitudinal edge portion and said slot;
(d) the inner core and outer layers of said web member being arranged with their grain directions (d.sub.i, d.sub.o) extending toward and parallel with said flange member, respectively;
(e) said flange member being arranged with its grain direction (d.sub.f) extending longitudinally and parallel with the grain direction of said web outer layers;
(f) the thickness dimensions of said inner core layer and said flange member being in accordance with the expression:
##EQU3## where:
t.sub.i =total thickness of said inner core layers;
w.sub.f =width of said flange member;
FS=fiber stress at the proportional limit, per unit area, in a compressive direction perpendicular to the grain of said flange member;
and
CS=maximum crushing strength, per unit area, in a compressive direction parallel to the grain of said inner core layer.

14 more elements

A laminated wooden structural assembly, comprising

(a) at least one multi-ply generally rectangular web member including a pair of spaced parallel outer layers, and at least one inner core layer bonded between said outer layers, each of said layers being formed of wood;
(b) at least one wooden flange member arranged adjacent one longitudinal edge portion of said web member, the longitudinal axis of said flange member being parallel with said one longitudinal edge portion of said web member;
and
(c) means rigidly connecting said web and flange members, said connecting means including
(1) a longitudinal slot contained in the surface of said flange member adjacent said web member;
(2) the longitudinal edge portion of said web member being inserted with a friction fit within said longitudinal slot;
and
(3) adhesive means bonding together the mating surfaces of said longitudinal edge portion and said slot;
(d) the inner core and outer layers of said web member being arranged with their grain directions (d.sub.i, d.sub.o) extending toward and parallel with said flange member, respectively;
(e) said flange member being arranged with its grain direction (d.sub.f) extending longitudinally and parallel with the grain direction of said web outer layers.

7 more elements

Dependencies are inferred from the claim text.