NL2025047B1 - Structural member for building applications - Google Patents
Structural member for building applications Download PDFInfo
- Publication number
- NL2025047B1 NL2025047B1 NL2025047A NL2025047A NL2025047B1 NL 2025047 B1 NL2025047 B1 NL 2025047B1 NL 2025047 A NL2025047 A NL 2025047A NL 2025047 A NL2025047 A NL 2025047A NL 2025047 B1 NL2025047 B1 NL 2025047B1
- Authority
- NL
- Netherlands
- Prior art keywords
- glass
- cast
- metal bar
- structural member
- cast glass
- Prior art date
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/29—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/28—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of materials not covered by groups E04C3/04 - E04C3/20
- E04C3/285—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of materials not covered by groups E04C3/04 - E04C3/20 of glass
Abstract
Structural member for building applications comprising a first portion capable to absorb a compressive load and a sec— ond portion capable to absorb a tensile load, wherein the first portion comprises cast glass and the second portion comprises a metal bar. Preferably the metal bar is embedded in the cast glass, such that the cast glass is cast around the metal bar. The cast glass and the metal bar are selected so as to arrange that an absolute difference of the thermal expansions of the cast glass and the metal bar, respectively is less than l><lO—6 Ki.
Description
Structural member for building applications The invention relates to a structural member for building applications comprising a first portion capable to absorb a compressive load and a second portion capable to ab- sorb a tensile load.
A very common example of such a known structural mem- ber comprises concrete for the first portion, and iron bars for the second portion.
According to the invention answers it is proposed that in the structural member of the invention, the first por- tion comprises cast glass and the second portion comprises a metal bar. It is known to provide structural components com- prising glass and metal as such, usually in a lamination of glass and metal, however the combination of cast glass with a metal bar having one or more features of the appended claims has up-to-date not been proposed.
It is found that when the structural member of the invention is subjected to a bending test, the cast glass shows a ductile behaviour, a warning mechanism for a possible break- down, and a good safety margin from initial cracks to total failure in bearing capacity, whereas still a notable post fracture loadbearing capacity remains.
The structural member of the invention opens a window of opportunities. The proposed combination of cast glass with a metal bar provides increased strength, even in comparison with the known combination of concrete with iron bars, which makes it suitable to be applied in loadbearing constructions without excessive use of material.
To promote the ambition of the invention it is desir- able that the metal bar is embedded in the cast glass.
It is preferred that the cast glass is cast around the metal bar.
Best results will be achieved when an absolute dif- ference of the thermal expansions of the cast glass and the metal bar, respectively is less than 1x10-¢ Kr More specifically it is preferred that the cast glass and the metal bar are selected to exhibit coefficients of thermal expansion that differ less than 10% from each other.
According to one suitable embodiment the first por- tion is cast borosilicate glass, and the second portion is a kovar bar.
According to another suitable embodiment the first portion is cast soda lime silica glass, and the second portion is a titanium bar.
The invention will hereinafter be further elucidated with reference to exemplary embodiments of structural members according to the invention that are not limiting as to the ap- pended claims.
The invention can for instance be embodied in a structural member, such as an assembled beam as a structural component for building applications, comprising a first por- tion capable to absorb a compressive load and a second portion capable to absorb a tensile load, wherein the first portion comprises cast glass and the second portion comprises a metal bar.
The assembled beam should preferably be construed such that the metal bar is embedded in the cast glass. In par- ticular the cast glass is preferably cast around the metal bar, wherein care is taken that the cast glass and the metal bar are selected to exhibit an absolute difference of the thermal expansions of the cast glass and the metal bar, re- spectively which is less than 1x107% Kì. More particularly it is preferred that the coefficients of thermal expansion differ less than 10% from each other.
First embodiment A first embodiment is assembled such that the first portion is cast borosilicate glass, and the second portion is a kovar bar.
A standard ASTM F15 Kovar® alloy as used in the com- position of the invention contains 29% Nickel, 17% Cobalt, and balance Iron. It has a coefficient of thermal expansion CTE of
4.6-5.2 107% Krt.
A typical borosilicate cast glass as used in the com- position according to the invention will contain around 703% S102 and 20% B203 and will have a coefficient of thermal expan- sion CTE around 5*1076 Kri, By combining the above two materials, optimum results will be reached. It is noted however that other typical high- borate borosilicate glasses containing 15-25% B:0:3, and 65-704 SiO; can be considered. However, a good bonding can still be reached with borosilicate glass compositions having a lower CTE. A typical borosilicate pyrex glass composition con- tains approximately 80% of silicon dioxide {(Si0:)}) and around 13% boron trioxide (B:20z). The pyrex borosilicate glass will have a CTE of around 3.3*10°% Krt, Variations in the percentage of B203 (10-15%) and CTE (3-4.5%¥10°¢ Kri) are also available and can be used. A variation to the kovar alloy can also be con- sidered to better match the CTE of pyrex glass. Thus borosilicate glass compositions with a B:03 con- tent between 10-25% can be used, yet for optimum results a Fe- Ni-Co alloy with a matching CTE should be chosen. Second embodiment A second embodiment is assembled such that the first portion is cast soda lime silica glass, and the second portion is a titanium bar. Titanium grade 1-4 bars can be used in the structural components of the invention and are the most pure (above 928% Ti), with titanium ASTM grade 2 (99.2%) being a common commer- cial choice. Titanium Grade 2 has a CTE of 8.6*10°¢ Kit. Tita- nium Grades 1, 2, 3, 4, 7, 11, and 12 are all considered unal- loyed and have similar mechanical properties and CTE. Other Titanium alloys that are usable have a similar CTE as well (for example TisAl4aV Grade 5 has a CTE between 8.7-9.1*10°¢ K-
1. Soda lime silica (SLS) glass compositions for use in the structural components of the invention have a matching CTE to the above titanium grades. An SLS composition for float or container glass applications will typically contain 71-74% SiOz, 12-15 Naz0, and 8-10% CaO and its CTE will range between
8.7-9% 107% Krt. Any typical commercial SLS glass can be matched with a pure titanium element or alloy, provided they have a similar CTE. General The proposed structural component of the invention can be assembled from any combination of cast glass and metal that have a similar thermal coefficient of expansion. The thermal coefficient of expansion of the chosen cast glass and metal should preferably differ less than 1*10-6 K-1, in par- ticular differ less than 10% from each other.
Although the invention has been discussed in the foregoing with reference to exemplary embodiments of the structural member of the invention, the invention is not re- stricted to these particular embodiments which can be varied in many ways without departing from the invention. The dis- cussed exemplary embodiments shall therefore not be used to construe the appended claims strictly in accordance therewith.
On the contrary the embodiments are merely intended to explain the wording of the appended claims without intent to limit the claims to these exemplary embodiments. The scope of protection of the invention shall therefore be construed in accordance with the appended claims only, wherein a possible ambiguity in the wording of the claims shall be resolved using these exem- plary embodiments. Aspects of the invention are itemized in the follow- ing section.
1. Structural member for building applications comprising a first portion capable to absorb a compressive load and a second portion capable to absorb a tensile load, character- ized in that the first portion comprises cast glass and the second portion comprises a metal bar.
2. Structural member according to claim 1, characterized in that the metal bar is embedded in the cast glass.
3. Structural member according to claim 1 or 2, characterized in that the cast glass is cast around the metal bar.
4. Structural member according to any one of claims 1 - 3, characterized in that an absolute difference of the thermal expansions of the cast glass and the metal bar, respective- ly is less than 1x107%6 Kri.
5. Structural member according to claim 4, characterized in that the cast glass and the metal bar are selected to ex- hibit coefficients of thermal expansion that differ less than 104 from each other.
6. Structural member according to any one of claims 1 - 5, characterized in that the first portion is cast borosili-
cate glass, and the second portion is a kovar bar.
7. Structural member according to any one of claims 1 - 5, characterized in that the first portion is cast soda lime silica glass, and the second portion is a titanium bar.
Claims (7)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2025047A NL2025047B1 (en) | 2020-03-04 | 2020-03-04 | Structural member for building applications |
| PCT/NL2021/050145 WO2021177825A1 (en) | 2020-03-04 | 2021-03-04 | Method for manufacturing a structural member for building applications |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2025047A NL2025047B1 (en) | 2020-03-04 | 2020-03-04 | Structural member for building applications |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL2025047B1 true NL2025047B1 (en) | 2021-10-14 |
Family
ID=70155295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL2025047A NL2025047B1 (en) | 2020-03-04 | 2020-03-04 | Structural member for building applications |
Country Status (2)
| Country | Link |
|---|---|
| NL (1) | NL2025047B1 (en) |
| WO (1) | WO2021177825A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4140537A1 (en) * | 1991-12-09 | 1993-06-17 | Gartner & Co J | Bracket for holding pane of glass - incorporates reinforcing member joined to or enclosing bushes or bolts inserted in it |
| US5223672A (en) * | 1990-06-11 | 1993-06-29 | Trw Inc. | Hermetically sealed aluminum package for hybrid microcircuits |
| DE19530572A1 (en) * | 1995-04-15 | 1996-10-17 | Seele Gmbh | Load carrier made of glass used in building construction |
| FR2905959A1 (en) * | 2006-09-15 | 2008-03-21 | Yves Marie Daniel Couasnet | Construction element for opening frame of building, has tied rod connected to glass beam for exerting compression force on ends of glass beam, where rod is equipped with tensioner for tensioning rod by applying traction force at its ends |
-
2020
- 2020-03-04 NL NL2025047A patent/NL2025047B1/en active
-
2021
- 2021-03-04 WO PCT/NL2021/050145 patent/WO2021177825A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5223672A (en) * | 1990-06-11 | 1993-06-29 | Trw Inc. | Hermetically sealed aluminum package for hybrid microcircuits |
| DE4140537A1 (en) * | 1991-12-09 | 1993-06-17 | Gartner & Co J | Bracket for holding pane of glass - incorporates reinforcing member joined to or enclosing bushes or bolts inserted in it |
| DE19530572A1 (en) * | 1995-04-15 | 1996-10-17 | Seele Gmbh | Load carrier made of glass used in building construction |
| FR2905959A1 (en) * | 2006-09-15 | 2008-03-21 | Yves Marie Daniel Couasnet | Construction element for opening frame of building, has tied rod connected to glass beam for exerting compression force on ends of glass beam, where rod is equipped with tensioner for tensioning rod by applying traction force at its ends |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021177825A1 (en) | 2021-09-10 |
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