Structural chord members for joist construction
阅读：114发布：2022-11-08
专利汇可以提供Structural chord members for joist construction专利检索，专利查询，专利分析的服务。并且A new structural chord member is provided from which joists can readily be formed of different sizes and capabilities. Each chord member has a cross section represented by two modified Z-section members disposed with their top flanges coplanar and their chord webs inclined toward one another, the junctions between the chord webs and the bottom flanges being spaced apart for insertion of joist web members to form the joist member. Each chord member is provided with compositing shear projections extending from its top flanges alternatively away from or toward the chord member interior. A particular joist construction comprises two spaced hollow chord members connected by a plurality of joist web members, the upper chord member being filled with high strength cementitious material to apply preloading tension to the lower chord member and increase the moment of inertia of the joist.，下面是Structural chord members for joist construction专利的具体信息内容。
1. A structural chord member adapted for the fabrication of joists therefrom comprising a pair of connected, opposed modified Z-section members, each member having a longitudinal shear projection, a top flange rigidly connected to the shear projection along a respective top member junction, a bottom flange and a chord web connecting the said top and bottom flanges, wherein the top flanges of the two members extend toward one another and are rigidly connected to one another at said top member junctions, wherein the chord webs are inclined toward one another from the top flange toward the bottom flange to provide a corresponding chord member cross-section of decreasing width, wherein the bottom junctions of each chord web with its respective bottom flange are spaced from one another for the insertion therebetween of a joist web member, and wherein the said shear projections project transversely to the top flanges.
2. The invention as claimed in claim 1, wherein each Z-section member is rolled from sheet steel material to have the said top and bottom flanges, the said chord web and the said shear projection integral with one another.
3. The invention as claimed in claim 1, wherein each said shear projection projects at about 60* to the respective top flange and the two projections are inclined at about 60* to one another.
4. The invention as claimed in claim 1, wherein the shear projections project from the said top member junctions into the interior of the chord member.
5. The invention as claimed in claim 1, wherein the shear projections project from the said top member junctions away from the interior of the chord member.
6. The invention as claimed in claim 1, and comprising two spaced structural chord members disposed spaced apart with their bottom flanges facing one another, and a plurality of joist web members each inserted at each end between the two bottom flanges of the corresponding chord member and fastened to the chord members to connect them and thereby form a joist member.
7. The invention as claimed in claim 1, and comprising two spaced structural chord members disposed spaced apart with their bottom flanges facing one another, and a plurality of joist web members connecting the chord members to form a joist, and wherein the upper chord member only is filled with a high strength cementitious material to apply corresponding tensional stress to the lower chord member and to increase the moment of inertia of the joist.
8. The invention as claimed in claim 1, and comprising two spaced structural chord members disposed spaced apart with their bottom flanges facing one another, and a plurality of joist web members connecting the chord members to form a joist member, wherein the upper chord member only is filled with a high strength cementitious material to apply corresponding tensional stress to the lower chord member and to increase the moment of inertia of the joist, and wherein the upper chord member has the respective shear projections projecting into its interior to be enclosed by the cementitious material.
9. The invention as claimed in claim 1, and comprising two spaced structural chord members disposed spaced apart with their bottom flanges facing one another, and a plurality of joist web members each inserted at each end between the two bottom flanges of the corresponding chord member and fastened to the chord members to connect them and thereby form a joist member, wherein the upper chord member has the shear projections projecting from the top flanges away from the interior of the chord member, and the lower chord member has the shear projections projecting from the top flanges into the interior of the chord member.
10. A structural chord member for the fabrication of joists therefrom comprising a top flange, two bottom flanges and two chord webs each connecting the said top flange and a respective bottom flange, wherein the chord webs are inclined toward one another from the top flange toward the bottom flange to provide a corresponding chord member cross-section of decreasing width, wherein the bottom junctions of each chord web with its respective bottom flange are spaced from one another for the insertion thErebetween of a joist web member, the member also comprising a shear projection rigidly connected to the top flange and constituted by a closed loop of material extending longitudinally thereof.
11. The invention as claimed in claim 10, wherein the said closed loop shear projection is constituted by a portion of the sheet steel material rolled to the form of a loop, the top flange, bottom flanges, chord web and projection all being integral with one another.
12. The invention as claimed in claim 10, wherein the junctions of the said closed loop projection with the top flange are disposed immediately adjacent to one another and are joined directly to one another.
13. The invention as claimed in claim 10, and comprising two spaced structural chord members disposed spaced apart with their bottom flanges facing one another, and a plurality of joist web members each inserted at each end between the two bottom flanges of the corresponding chord member and fastened to the chord members to connect them and thereby form a joist member.
14. The invention as claimed in claim 10, and comprising two spaced structural chord members disposed spaced apart with their bottom flanges facing one another, and a plurality of joist web members connecting the chord members to form a joist, wherein the upper chord member only is filled with a high strength cementitious material to apply corresponding tensional stress to the lower chord member and to increase the moment of inertia of the joist.
15. The invention as claimed in claim 1, wherein the upper chord member is provided with at least one respective shear projection rigidly fastened thereto and projecting into its interior to be enclosed by the cementitious material.
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