Description TSC BEAM FORMED WITH BOTTLE NECK TOP FLANGE
 The Present invention relates to TSC beam formed with bottle neck top flange(BNTSC Beam ) that can be superior in competition with structure of reinforced concrete
 The reason that the above TSC beams are produced in various shapes by size is has the limit of cold bending of steel plates by thickness and the limit of width of hot coils available and size of forming equipment.
 Top flange of all these four types is the type that projects from left and right of top web to the level direction outside. Top flange has the weak point that the width is 90mm because of being background attaching shear connector (stud type of Fig. 5, 6, 7 or L shape steel shear connector of Fig. 3, 4) unifying slab and TSC beam and the whole width of beam broadens a lot as well as bird's mouth putting up deck plate to pour slab concrete. Also, top flange of TSC beam is the top open that left and right is separated. So, when shear connector of stud type is used, it have to tie with transverse member (27, 37) apart such as from Figure 3 to 7 to prevent lateral buckling by the lateral pressure of bending during construction period and resist the lateral pressure of concrete filled inside.
 Therefore, as TSC beam has been produced with only a steel sheet of more than
6mm by now, the use of an extra-large-sized, large-sized, middle-sized TSC beam in long span for high load is active. And, especially, a middle-sized TSC beam is produced in large quantities due to assembly work in factory and its supply has been spreading gradually. Meanwhile, when short span for static load is applied, to be sure, a small-sized TSC beam made of the steel of less than 6mm is superior in competition with structure of reinforced concrete in common. But, it is difficult to carry out (Fig. 5) attaching conventional shear connector to top flange of a small-sized TSC made of the steel of less than 6mm and it costs a great deal.
Disclosure of Invention Technical Problem
 A extra large and large-sized TSC beam (a large-sized TSC beam is less than
10mm thick, and if more than that, a extra large TSC beam), whose height of web is
more than 600mm, and a middle-sized TSC beam, whose height of web is more than 300mm and less than 600mm, has got successful results, but a small-sized TSC beam, whose a thickness of steel is thin about 3 to 6mm and each height of web is small about 100 to 300mm, has to find how to attach shear connector without welding to top flange, and it can be superior in competition with any other structure.
 A small-sized TSC beam (20) welds L shape steel between left and right of web and keeps gaps and prevents buckling by the lateral pressure of bending and is used as the foothold of working, but it is uneconomic and can cause inferior goods because cross section of L shape steel itself is large, so it need new way not to weld. As top flange (22) of the small-sized TSC beam projects outside of left and right of web (23), the whole width of the beam broadens relatively and has a limit in reducing the size of column attached. So, it needs means that resist torsion moment by eccentric load during construction period. Also, it needs the measure that can control interfacial phenomena that can be occurred in the interface of web plates with concrete shrinkage due to during hardening of concrete filled inside.
 The worst point of the small-sized TSC beam is that the cross section of its top flange is much smaller than that of bottom flange. So, it needs the measure that can prevent increasing number of temporary supports for controlling deflection before during curing of concrete because of small section modulus and moment of Inertia.
 Therefore, the purpose of the present invention is to develop TSC beam formed with bottle neck top flange (BNTSC Beam, 1) that can be superior in competition with structure of reinforced concrete.
 As the whole width of beam is narrow and the size of column joined become.
Small in Figure 1, BNTSC Beam of the present invention can attach easily economic bolt + steel pipe (7) shear connector without depending on welding. So, In the future, if a middle-sized TSC beam cold formed in coil in factory changes into top flange of BNTSC beam, it can be superior in competition with steel construction and structure of reinforced concrete, too. Now an extra-large-sized, large-sized, and middle-sized TSC beams are economic by 20 to 30 percent over common steel used H shape steel. And they are used to many buildings that need the reduction of a construction periods and floor-to-floor heights because of the cost of construction similar to reinforced concrete.
 A small-sized TSC beam is permanent form and member cold formed a steel coil of 3 to 6mm continuously into W shape like Figure 3. Like Figure 4, it is to construct composite beam that It is to weld, putting on L shape steel (27) by 20 to 30cm across inside of between top flanges (22) projected from left and right web (23) to the level
direction outside to take a role as shear connector (shear connector unifying the lower end of a small-sized TSC beam and top concrete slab) and put deck plate (29) outside of top flange of TSC beam nearby and then pour inside of a small-sized TSC beam and slab (30) concrete in a single body and construct composite beam.
 Standard of shear connector, as stud type like Figure 5, uses stud to instant electric adhesion, and it is secured that thickness of steel have to be more than 6mm to adhere at least stud of 16mm in diameter. Therefore, using to a middle-sized, large-sized, and extra-large-sized TSC beam is suited, but a small-sized TSC beam welds L shape steel instead of shear connector of stud type and keeps gaps between left and right of web and prevents buckling by the lateral pressure of bending and is used as the foothold of working. But, L shape steel can make inferior goods during welding and it is difficult and uneconomic to secure welding works putting on top flange although cross section of L shape steel itself is large.
 As the top flange of the small-sized TSC beam projects outside of left and right of web, the whole width of beam broadens relatively and has a limit in reducing the size of column attached. The top flange of the small-sized TSC beam, as TSC beam of more than middle-size, projects outside and it is difficult to resist twisting bond stress by eccentric load during construction. Also, to project for top flange of the small-sized TSC beam outside can cause interfacial phenomena between web and concrete in case that shrinkage of concrete filled inside is large.
[ 17] The worst point of the small-sized TSC beam is that the cross section of its top flange is much smaller than that of bottom flange. And it is inefficient structurally and increases construction support numbers for controlling deflection before being completed curing of concrete because of small section modulus and moment of Inertia.
 BNTSC beam can be used as permanent concrete form and member for small steel concrete beam that span of the spot is short or unit load for design isn t large. And as the BNTSC beam has economical efficiency full with the unit cost of production, construct ability and economical efficiency of shear connector, and reduction of temporary support numbers, it can be superior in competition with structure of common reinforced concrete. And it has the effect that makes equal a term of works and a steel frame equal. Also, it is a great help to reduction of the cost of construction indirectly due to decreasing floor height of building because height of BNTSC beam has decreased. Meanwhile, if top flange (22) of the middle-sized TSC beam changes into TSC beam formed with bottle neck, the shapes can be standardized.
Brief Description of the Drawings
 Fig.l is perspective view attaching bolt + steel pipe shear connector to beam.
 Fig.2 is the composite beam composed BNTSC beam and floor slab.
 Fig.3 is perspective view welding shear connector of L shape to a small-sized TSC beam.
 Fig.4 is the composite beam composed small-sized TSC beam and floor slab.
 Fig.5 is perspective view welding shear connector of stud type and member for traverse apart to a small-sized TSC beam.  Fig.6 is perspective view welding shear connector of stud type and member for traverse apart to a middle-sized TSC beam.  Fig.7 is perspective view welding shear connector of stud type and member for traverse apart to a large-sized TSC beam.  Fig.8 is perspective view welding shear connector of stud type and member for traverse apart to an extra-large-sized TSC beam.  <Simple explanation about signs and terms of the figure>
 1 : TSC beam formed with bottle neck top flange (BNTSC Beam)
 2, 22 : top flange
 3, 23 : web
 4, 24 : bottom flange
 5, 35 : Y type projection
 6 : a bolt hole
 7 : bolt + steel pipe
 8 : nut
 9, 29 : deck plate
 10, 30 : slab
 20 : a small-sized TSC beam
 25 : tenon shape
 27 : L-Shape
 28 : stud
 36 : tenon reinforcing bar (bottom bar of slab)
 37 : member for traverse
Mode for the Invention  BNTSC beam (1) is permanent concrete form and structural member cold formed continually with steel coil of 3 to 6mm and the outline its top flange section has form with bottleneck. Concrete pour into permanent form formed with bottleneck, and it can have internal force of bending by compositing steel and concrete and left and right of
web (3) takes a stirrup role, shear reinforcing bar of common reinforcing concrete beam. A couple of left and right top flange, as D shape, keeps certain gaps, turns towards its back each other, and its section has form with bottleneck and it takes charge of compression force of bending until slab concrete secures prescribed compressive strength.
 The vertical part of top flange takes the base role that inserts bolt + steel pipe(7), shear connector, into the bolt hole (6) made in advance and attaches into a nut and shear connector role as bond stress itself. The above bolt + steel pipe keeps width between left and right top flange, and it prevents buckling by the lateral pressure of bending and is used as the foothold of working. As top flange has form with bottleneck, it can exclude interfacial phenomena with concrete in BNTSC beam (1) and web.
 The horizontal part of top flange prevents lateral buckling of the vertical part and getting damaged and doing damage in dealing. Also, as the section of the vertical part and horizontal part of top flange is concealed in concrete slab, it doesn t have influence on height increasing the beam depth, and it has secondary profits that value of section modulus and moment of Inertia becomes large. Thus, efficiency of structural section becomes large, and it is linked directly with improving economical efficiency.
 The bottom flange (4) connected horizontally in the lower edge left and right of web is tensile member against tensile strength of bending. And it takes the role that adds Y shape projection and increases cross section of tensile member of bending and promotes bond stress with concrete, and it takes the groove role welding two pieces of left and right.
 In Figure 1, in the vertical upper part of top flange, it is made bolt hole of 14 to 15 mm in diameter by 100mm in cold forming factory. And it is inserted bolt + steel at intervals suited to applying to quantities needed on structural calculation and a foothold for passing, and it is fixed with nuts to the outside of the vertical part of top flange. The rest bolt holes (6) are applied to perforation hole for partly continuity of the bottom reinforcing bar of slab.