WO2011115713A2

WO2011115713A2 - Steel-wood composite structure using metal jacket wood studs and rods

Info

Publication number: WO2011115713A2
Application number: PCT/US2011/024661
Authority: WO
Inventors: Weihong Yang
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-03-19
Filing date: 2011-02-12
Publication date: 2011-09-22
Anticipated expiration: 2012-09-19
Also published as: US20120298943A1; WO2011115713A3

Abstract

Steel-wood composite structure using light gauge steel sheet warping around standard wood members to achieve exceptional structural performance that is superior to that when either steel or wood used along. Just to name a few of a very long list, the merits of the novel system include higher strength and ductility, stronger yet simpler connections, better fire and erosion resistance, and higher quality and light weight.

Description

Steel-Wood Composite Structure using Metal Jacket Wood Studs and Rods by WeiHong Yang, PhD, SE, LEED GA

A completely new structura! system has been invented. This is steel-wood composite structure using light gauge steel sheet warping around standard wood members to achieve exceptfonal structura! performance chat is superior to that when either steei or wood used along. Just to name a few of a very long list, the merits of the novel system include higher strength and ductility, stronger yet simpler connections, better fire and erosion resistance, and higher quality and light weight. The present invention covers the who!e structura! system, which includes components, their connections, vertical gravity framing systems and lateral setsmic/wind systems, ft will change the way Iight-framed structure being tradttionaiiy designed and constructed, and has the potential to eventually reform the current market of iight-framed construction in the United States. The economical and social impact on building construction industry will be incredible.

By definition, "composite structure" combines different materials together to form a new structure. Since it fully utilises the potential of individual materials, the advantages of composite structures have been weil recognized in the engineering community during the past decades. However, past applications are mostly combining steei and concrete in various forms, and primarily used in commercial buildings and infrastructures. For example, concrete-filled steel tubes, composite floor decks etc.

In the meanwhile, both wood structure and light gauged steel structures have been in existence for very long time. As a matter of fact, they are the two primary Sight-framed structural: systems that are currently widely used in residential and low-rise commercial buildings across North America. However, the benefit of combined these two systems together have never been discovered and explored. For the first time in the history, the present invention combines these two systems in a systematical approach to create a brand new and better structura! system. The importance of present invention is comparable to "adding steei rebars into concrete", a simple yet historical invention that had reshaped the world we are living.

List of additional figures:

Fie.13: Circular composite pole of truncated-cone shape

(a) Solid core with truncated-cone shape. It could be made of regular wood,

engineering wood. For light duty usage, plastic or foam can also be used. The straight groove along the height at the perimeter is to allow metal jacket being bended into it for a smooth finishing surface of the final product. The hole at the middle is for electrical wires and cables going-through when needed, as light poles, for example.

(b) Segment of composite pole;

(c) Light-gauged cold-formed steel jacket.

Fig.14: Circular composite rod

(a) Solid wood rod core with a straight groove along the height at the perimeter to allow metal jacket being bended into it for a smooth finishing surface of the final product.

(b) Circular composite rod;

(c) Light-gauged cold-formed steel jacket;

(d) Magnified view of metal jacket detail.

Fig.15: Example applications of metal-jacket composite pole. The light-weighted products are intended to replace many heavy steel or concrete infrastructures, for example:

(a) Flag poles;

(b) Street light poles;

(c) Traffic signal lights and signs supporting structures.

Fig.16: Example applications of metal-jacket composite rod. This product is intended to replace steel pipe in many light weight supporting structures, for example:

(a) Traffic sign poles;

(b) Poles for wire mesh fence.

Fig. 17: Composite joist used as floor framing supported on a typical stud wall

Fig.18: Typical triangular roof truss made of composite s studs:

(a) Wood cores;

(b) Composite studs, connected together with connection steel plates and screws, to form a typical roof truss;

(c) Metal jackets; Fig.19: Magnified views of tvpical connection of the truss shown in Figure 18: (note that screws are shown, but connection plates not shown for clarity)

(a) Connection at support;

(b) Connection at top;

(c) Intermediate connection at bottom code.

Fig.20: Segment of open web truss made of composite s studs

Fig,21: Composite post with composite beams at bottom and top

Fig.22: Composite sheeting made of lamination of plywood and metal sheet. The plywood and the metal sheet is connection through pre-punched teeth, and it is of typical plywood dimension, i.e. 4 ft x 8 ft. There are additional pre-drilled circular holes on the metal sheet. There holes follow certain pattern to allow convenient nailing at field without additional drilling. This type of sheathing is intend to be used in combination with composite stud to form a new type of shear wall systems, as shown in Figures 10 and 11. The performance is expected much better than traditional shear walls, either wood or metal ones, as illustrated in Figure 12.

Fig.23: Magnified bottom views of composite sheathing shown Figure 18: Connection at top;

(a) Typical plywood;

(b) A piece of composite sheathing with wood and metal laminations;

(c) Metal sheet with pre-punched teeth and pre-drilled holes.

Fig.24: Magnified top views of composite sheathing shown Figure 18: Connection at top;

(a) Typical plywood;

(b) A piece of composite sheathing with wood and metal laminations;

(c) Metal sheet with pre-punched teeth and pre-drilled holes.

Claims

List of claims: Claim I : composite stud, joist, beam or post, comprising (g) A core member that is made of either saw lumber, or engineering wood of any kind, which is of typical sizes, including square, rectangular or circular cross sections;(h) A metal jacket that fully or partially wraps around the perimeter of wood core section;(i) The above recited metal jacket wraps the wood core in full length, and connected to the wood using any one or more of the following methods:

1 . Pre-punched teeth of any pattern that bite into the wood core;

2. Metal nails or screws that spaced at certain distance along the length of the

composite member at any pattern;

3. When the metal jacket fully wraps the core section perimeter with a overlap, the edges of the metal jacket are welded together to seal the wood core using either spot welding, or segment welding, or their combinations, or full length welding;

4. When the metal jacket fully wraps the core section perimeter with a overlap, the metal jacket are closed by twist and/or bending the overlap in any form;

(j) The wood core is solid without void and is made of one piece, or several segments of wood. The metal jacket is of one piece, or of several pieces of light-gauged cold- formed steel sheets.

(k) The composite stud is with or without connecting tags at one or both ends;

(I) The metal jacket is with or without pre-punched holes or teeth of any pattern for convenient field installation of any sheathing boards using nails or screws without drilling through the metal jacket at field required.

Claim 2: A sheathing board, that is used in building construction, and that has

(a) Pre-marked pattern at one or both faces that matches the pre-punched holes at

composite studs as recited in claim 1 for the purpose of locating nailing holes.

(b) The above pre-marked pattern can be of one or more of the following formats:

1 . Factory drilled holes;

2. Printed marks;

3. Factory made Indentations.

(c) The sheathing material including but not limited to the following:

1 . Plywood;

2. Gypsum board;

3. Oriented strand board (OSB);

4. Particle board;

5. Wood board;

6. Building board, mad of any other existing and future building material, that is used as either interior or exterior sheathings.

Claim 3: Building gravity system, made of the composite studs as recited in claim I . including:

(a) Stud walls of typical building constructions that is made of, or partially made of, composite studs and posts; (b) Floor framing of typical constructions that is made of, or partially made of, composite joists and beams;

(c) Roof framing of typical constructions that is made of, or partially made of, composite joists and beams;

(d) Floor or roof trusses that is made of, or partially made of, composite studs;

(e) Composite posts that are used to support floor, deck, or roof gravity loads;

Claim 4: Building lateral system, made of the composite studs as recited in claim I . including:

(a) Shear walls that are made of, or partially made of, composite studs and posts, and have plywood or metal sheathing as recited in claim 2 at one or both faces;

(b) Shear walls that are made of, or partially made of, composite studs and posts, and have with typical tension straps at one or both faces, and one or both directions;

(c) Cantilever system that used cantilever composite post to resist lateral loads;

Claim 5: Other structural system, made of the composite studs as recited in claim 1. including:

(a) Composite posts that are used to support electric power lines, and/or

telecommunication cable lines.

(b) Composite posts that are used support lights along street;

(c) Composite posts that are used as flag or banner posts;

(d) Composite posts that are used as fence posts.