JP2000170323A - Truss and brace structure material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the buckling strength and toughness of a truss beam by filling the inside of a steel pipe comprising an upper chord or a lower chord constituting the truss beam with the composite material (FRC material) of the fiber reinforcing cement of high toughness. SOLUTION: The inside of a hollow steel pipe is filled with the composite material (FRC material) of the fiber reinforcing cement of high toughness 6. In this case, it may be filled into the whole cross section of the hollow inside and the entire length of the steel pipe 7, but a hollow part may be left on the center part of an axial direction to be filled in the form of a ring, and thereby a truss beam can be lightweight. In addition, it is easily deformed for the horizontal force of an upper chord 2 and a lower chord 3, for instance, the inside of the hollow pipe 7 can be filled with the FRC material 6 of the high toughness only in the neighborhood of a joining part with a column 9. Thereby the buckling strength and the toughness of the truss beam 1 are improved by bending strength and the high toughness possessed by the FRC material 6 and tensile strength is improved as chord material by high tension performance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an upper chord material, a lower chord material, and a structural material such as a brace having a rigid frame structure used for a truss beam.

[0002]

2. Description of the Related Art For example, a truss beam 1 is formed by joining both ends of a diagonal member 4 between an upper chord member 2 and a lower chord member 3 which are parallel to each other as shown in FIG. The upper chord 2, the lower chord 3 and the diagonal 4 may be made of a steel pipe having a circular cross section.

When the upper chord 2, the lower chord 3 and the diagonal 4 are made of steel pipes as described above, they may be used as hollow steel pipe trusses, or concrete 5 may be used inside the hollow.
And mortar are densely filled and hardened to form a concrete filled steel pipe truss (CFT truss) having a steel pipe concrete structure. In this case, concrete 5 is filled over the entire length of the steel pipe as shown in FIG. 12, or concrete 5 is partially filled only at the end where plastic deformation of the truss is likely to occur as shown in FIG. There is something.

[0004] This CFT truss is said to have a significantly improved buckling strength, as compared to a hollow steel pipe truss, because the concrete filled therein also bears a compressive force, as shown in FIG. If the stiffener spacing is appropriate, such as a coffer truss, there is no such property that the strength decreases after lateral buckling unlike the hollow steel pipe truss. However, if the stiffener spacing is wide such as a four-span truss,
As shown in FIG. 15, as in the case of the hollow steel pipe truss, the truss has a property showing a decrease in proof stress after lateral buckling.

[0005] The braces are similar to the trusses, and hollow steel pipe braces or concrete-filled steel pipe braces (CFT braces) are sometimes used. In the CFT braces, as shown in FIG. In order to bear the force, the compressive strength becomes large.

In the tensile behavior, as shown in FIG. 26, the steel pipe is in a biaxial stress state due to the presence of concrete, so that the tensile strength increases.

[0007] In addition, when comparing the hollow steel tube brace and the CFT brace also in a rigid frame with a brace, the CFT brace is compared with the hollow steel tube brace as shown in the graphs of FIGS. It can be seen that the proof stress is greater. By the way, Figure 27,
FIG. 28 shows a case where a hinge is formed at the center of the beam, and FIG.
T brace, FIG. 28 is a hollow steel tube brace, FIG. 29, FIG.
30 is the case where the center of the beam remains elastic, FIG. 29 is the CFT brace, and FIG. 30 is the hollow steel tube brace. According to this, the horizontal load value at which the buckling occurs in the brace is smaller for the CFT brace than for the hollow steel tube. Greater than braces.

[0008]

As described above, in the CFT truss, the lateral buckling strength and the buckling strength of the upper chord and the lower chord are larger than those of the hollow steel pipe truss. In some cases, it is necessary to improve toughness.

[0009] The same applies to the CFT brace. Although the proof strength is higher than that of the hollow steel pipe brace, if buckling occurs on the compression side as in the case of the hollow steel pipe brace, the proof strength is significantly reduced thereafter, and the toughness is reduced. In some cases, the structural design was uneconomical in trying to obtain toughness.

An object of the present invention is to solve the above-mentioned disadvantages of the prior art and improve the buckling strength and toughness. In particular, in the case of a CFT truss, the conventional stiffener such as a lateral stiffener can be saved, and the cost can be reduced. It is an object of the present invention to provide a brace structural material that can be obtained and can obtain toughness without performing uneconomical structural design even in a CFT brace.

[0011]

In order to achieve the above object, the present invention firstly provides a truss structural material used as a truss beam, which has high toughness in a steel pipe serving as an upper chord and / or a lower chord. Fiber reinforced cement composite material (FRC material)
The main point is that is filled.

Second, the high toughness fiber reinforced cement composite material (FRC material) is filled only in a part of the steel pipe. Third, the high toughness fiber reinforced cement composite material (FRC material) is used.
The C material) is intended to be filled so that a hollow portion is formed over the entire length or a part of the steel pipe.

Fourth, a truss structural material used as a brace having a rigid frame structure, wherein a steel pipe is filled with a high toughness fiber reinforced cement composite material (FRC material).

Fifthly, the tensile strength of a high-toughness fiber-reinforced cement composite material (FRC material) such as studs, Kaiser bars, deformed bars, etc., is attached to the upper and lower chord members of the truss and the plate joined to the ends of the braces. Is attached to the plate, and the transmission member is embedded in a high-toughness fiber-reinforced cement composite material (FRC material).

Sixth, the tensile strength of a high-toughness fiber reinforced cement composite material (FRC material) is applied to the gusset plate by using a pipe-through type gusset plate joined to the upper chord material, lower chord material, and the end of the brace. The gist is to provide a plurality of holes for transmitting.

Seventh, the high-toughness fiber-reinforced cement composite material (FRC material) is a crack-dispersed type exhibiting a tensile strain of 1% or more in a tensile test of a hardened body on the age of 28, and has the following [F1 ] PVA staple fiber having a water cement ratio (W / C × 100) of 40% or more and a sand cement ratio (S
/ C) is less than 1.0 (including 0). The gist of the present invention is that the composition is randomly dispersed and compounded in three-dimensional directions at a compounding amount of%. [F1] Fiber strength: 1000 to less than 1500 MPa. Apparent fiber strength: 700 to less than 1000 MPa. Fiber diameter: 40-50 μm. Fiber length: 5-20 mm.

Eighth, the high-toughness fiber-reinforced cement composite material (FRC material) is a crack-dispersed type exhibiting a tensile strain of 1% or more in a tensile test of a hardened material on the age of 28, and has the following [F2 ] Is added to the matrix of the mixture having a water cement ratio (W / C × 100) of 30% or more and a sand cement ratio (S / C) of 1.0 or less (including 0) by 1 to 3 vol. . The gist of the present invention is that the composition is randomly dispersed and compounded in three-dimensional directions at a compounding amount of%. [F2] Fiber strength: 1500 MPa or more and 2400 MPa or less. Apparent fiber strength: 1800MP over 1000MPa
a or less. Fiber diameter: 50 μm or less. Fiber length: 5-20 mm.

According to the first aspect of the present invention, a high toughness fiber reinforced cement composite material (FRC material) is filled in a steel pipe serving as an upper chord material and / or a lower chord material constituting a truss beam. The buckling strength and toughness of the truss beam are improved by the bending strength and high toughness of the material. Also, due to the high tensile performance of the FRC material,
The tensile strength as a chord material is also improved.

According to the second aspect of the present invention, in addition to the above-mentioned effects, the FRC material is filled only in the end part of the steel pipe to improve the buckling resistance and the toughness while improving the buckling resistance and the toughness. Performance can be improved and costs can be reduced.

According to the third aspect of the present invention, in addition to the above operation, the truss can be reduced in weight by filling the FRC material so that a hollow portion is formed over the entire length or a part of the steel pipe. In this case, even if it is formed in a hollow shape, the filling material has higher toughness than conventional concrete, so that fracture is suppressed and no inconvenience occurs.

According to the fourth aspect of the present invention, by filling a steel pipe with a high toughness fiber reinforced cement composite material (FRC material) as a brace having a rigid frame structure, a high bending property of the FRC material in compression behavior is obtained. Buckling strength and subsequent reduction in strength are suppressed by the properties, and toughness is also improved. In terms of tensile behavior, high-toughness concrete also has excellent tensile behavior, so that tensile strength is improved.

According to the fifth aspect of the present invention, in addition to the above functions, members such as studs, Kaiser bars, deformed reinforcing bars, etc. are provided on the upper chord member, the lower chord member, and the plate joined to the ends of the braces. By embedding the member in a high toughness fiber reinforced cement composite material (FRC material), the tensile force of the FRC material can be effectively transmitted to the plate.

According to the sixth aspect of the present invention, in addition to the above-mentioned operation, a plurality of holes are formed in the pipe-through type gusset plate joined to the ends of the upper chord material, the lower chord material, and the brace. Through the holes, the tensile strength of the high-toughness fiber-reinforced cement composite material (FRC material) filled in the strings or braces can be effectively transmitted to the gusset plate.

According to the seventh and eighth aspects of the present invention, a high-toughness fiber-reinforced cement composite material (FRC material) can realize a crack-dispersed FRC material using PVA fiber which is a general-purpose fiber. , It has both economical efficiency and high toughness.

[0025]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory view showing a first embodiment of a truss structural material of the present invention, and FIG. 2 is a longitudinal sectional side view of a chord, which is a main part of the truss structural member. In the figure, the same components as those of the conventional example shown in FIG. 12 are denoted by the same reference numerals. The truss beam 1 is formed by joining both ends of a diagonal member 4 between an upper chord member 2 and a lower chord member 3 which are parallel to each other as in the conventional case. It is composed of a steel pipe 7. Further, the steel pipe may have a square cross section.

In the present invention, the hollow steel pipe 7 is filled with a high-toughness fiber-reinforced cement composite material (hereinafter referred to as FRC material) 6. The FRC material 6 is, as an example, a crack-dispersed fiber-reinforced cement composite material (FRC material) having a tensile strain of 1% or more in a tensile test of a hardened body on an age of 28 days. PVA
Short fibers are added to a matrix of a mixture having a water-cement ratio (W / C × 100) of 40% or more and a sand-cement ratio (S / C) of 1.0 or less (including 0). %
Is randomly dispersed and blended in the three-dimensional direction. [F1] Fiber strength: 1000 to less than 1500 MPa. Apparent fiber strength: 700 to less than 1000 MPa. Fiber diameter: 40-50 μm. Fiber length: 5-20 mm.

Alternatively, the FRC material 6 is a crack-dispersed fiber-reinforced cement composite material (FRC material) having a tensile strain of 1% or more in a tensile test of a hardened body on an age of 28 days, and has the following [F2] Of PVA staple fibers in a matrix having a water-cement ratio (W / C × 100) of 30% or more and a sand-cement ratio (S / C) of 1.0 or less (including 0) by 1 to 3 vol. % And randomly dispersed and compounded in the three-dimensional direction. [F2] Fiber strength: 1500 MPa or more and 2400 MPa or less. Apparent fiber strength: 1800MP over 1000MPa
a or less. Fiber diameter: 50 μm or less. Fiber length: 5-20 mm.

High toughness FRC material 6 containing the PVA fiber
Is that the frictional adhesion strength between the matrix and the fiber is 1-6MPa,
The chemical adhesion strength is 40 MPa or less.

In addition, when mixing PVA short fibers in a mortar at random in a three-dimensional direction, the complementary energy J'b obtained by the following equation (5) is obtained.
And the fracture toughness Jti of the matrix having the relationship of equation (1)
Use PVA short fibers satisfying the relationship of 3Jtip <J'b with p and determine the formulation of the matrix.

[0030]

(Equation 2) Where σ _a : acting stress when _a multi-clutch occurs δ _a : opening displacement at the center of the crack when _a multi-crack occurs σ _c : bridging stress due to fiber σ _c (δ): relationship between bridging stress due to fiber and opening displacement δ σ _peak : maximum bridging stress δ _peak : opening displacement corresponding to σ _peak . Here, Jtip is a value that can be controlled by the preparation of the matrix, that is, the water-cement ratio or the sand / cement ratio, and the value can be confirmed by an experiment. For example, Ogishi, Ono: Effect of test factors on fracture toughness of cement paste and mortar, Concrete Engineering Vol.2
5, No. 2, PP. 113-125.

The high toughness FRC material 6 has a tensile strain of 1%
Or more, preferably 2% or more. The term "tensile strain" refers to the amount of strain (%) at the maximum tensile stress value in a stress-strain curve obtained by a tensile test of a cured product having a material age of 28 days or more. Actually, a tensile test of a specimen at a material age of 28 days (for example, a specimen having a cross-section of 30 mm × 13 mm having a length of 80 m
m, a tensile test is performed in a test section of m).

The fact that the tensile strain is 1% or more means that
This means that a crack-dispersed fracture phenomenon in which a number of cracks (multi-cracks) occur in a direction substantially perpendicular to the loading direction (stress direction) has occurred.

Steady S is a cause of multi-crack
As a result of repeated tests and studies to realize the tate cracking phenomenon (SSC phenomenon) with PVA fiber, when the properties of the PVA fiber used and the properties of the matrix are combined well,
It has been found that a high toughness FRC material having a tensile strain of 1% or more, preferably 2% or more can be obtained even with PVA fibers.

The following PVA short fiber F1 was prepared by mixing a water cement ratio (W / C × 100) of 40% or more with a sand cement ratio (S / C).
C) In a matrix of formulas with 1.0 or less (including 0),
1.5 to 3 vol. % And randomly mixed in the three-dimensional direction (referred to as “formulation 1”), the following PVA fiber F2 is mixed with a water-cement ratio (W / C × 100).
Is 30% or more and the sand-cement ratio (S / C) is 1.0 or less (including 0). %
When the compounding amount is randomly dispersed and compounded in the three-dimensional direction (referred to as compounding 2), the crack dispersing type high toughness FR
It was found that C material was obtained.

[Fl] Fiber strength: 1000 to less than 1500 MPa, apparent fiber strength: 700 to less than 1000 MPa, fiber diameter: 40 to 50 μm, fiber length: 5 to 20 mm. [F2] Fiber strength: 1500 MPa or more and 2400 MPa or less, Apparent fiber strength: 1000 MPa or more and 1800 MPa
a or less, fiber diameter: 50 μm or less, preferably less than 40 μm, preferably 20 μm or more, fiber length: 5 to 20 mm. The "apparent fiber strength" in F1 and F2 is the PV
The strength at which the A fiber breaks in the actual FRC material, which can be measured by performing a break test on the fiber in the actual FRC material.

In Formula 1 using F1, if the water-cement ratio of the matrix is less than 40%, the modulus of elasticity and rupture toughness of the matrix are increased for this fiber, so that multicracks do not occur and the tensile strain of 1% or more is obtained. Does not occur. On the other hand, if the sand-cement ratio exceeds 1.0, the elastic modulus and fracture toughness of the matrix are increased for this fiber, so that multi-cracks do not occur and tensile strain of 1% or more does not occur. Therefore, the matrix in the case of using F1 fiber is 40% or more of water cement, preferably 42% or more, more preferably 44% or more, and the sand cement ratio is 1.0 or less, preferably 0.7 or less, more preferably. 0.5 or less. However, even with this blended matrix, the blending amount of F1 fiber was 1.5 vol. % Or less, multi-cracks do not occur. Need to be more than%. However, the effect is saturated even if it is mixed in too much. % Or less.

Further, even with the matrix and the fiber blending amount of this preparation, if the length of the F1 fiber is less than 5 mm, multi-cracks do not occur, so that it is necessary to use a fiber having a length of 5 mm or more. . However, even if a material longer than 20 mm is used, multicracks do not occur at the above-mentioned amount. Therefore, the length of F1 fiber is 5-20m
m, preferably 6 to 18 mm, more preferably 6 to 15 mm.

When filling the hollow steel pipe 7 with the high toughness FRC material 6 as described above, it may be filled over the entire cross section of the hollow interior and over the entire length of the steel pipe 7 as shown in FIG. However, as shown in FIG. 3, the hollow portion 8 may be filled in a ring shape while leaving the hollow portion 8 at the center in the axial direction. Thereby, the weight of the truss beam can be reduced. In the case of filling in a hollow shape, there is a problem that the conventional concrete is liable to be broken.
If the material 6 is used, destruction is suppressed, and no problem occurs even if the material 6 is hollow.

Further, as shown in FIG. 1, the upper chord 2 and the lower chord 3 are easily deformed by a horizontal load.
The high-toughness FRC material 6 can be filled into the hollow steel pipe 7 only in the vicinity of the joint with the steel pipe 7.

As shown in FIG. 9, the truss beam 1 having the upper chord 2 and the lower chord 3 composed of the steel pipe 7 filled with the tough FRC material 6 is made of a conventional mortar or steel fiber concrete (see FIG. 9). FIG. 11 shows a bending angle relationship with a moment at the end of the truss beam 1 due to bending in one direction or the like applied to the end of the truss beam 1 due to the bending strength and high toughness of the FRC material 6 having higher toughness as compared with existing materials such as SFRC). As shown in FIG. 5, it can be seen that the buckling strength and toughness of the truss beam 1 are improved as compared with the conventional hollow steel pipe truss and concrete steel pipe truss. Further, due to the high tensile performance of the FRC material 6 as shown in FIG.
The tensile strength as a chord material is also improved.

By the way, as shown in FIG. 4, the steel pipe 7 and the column 9 constituting the upper chord member 2 and the lower chord member 3 are connected to the steel pipe 7 through bolts 12 through a gusset plate 10, for example.
By joining this pipe passing gusset plate 10 into a slit provided at the joint end of the steel pipe 7, it is joined to the steel pipe 7.

In the case of such a joint structure, the pipe passing gusset plate 10 is made of a high toughness FRC filled inside the steel pipe 7.
5 and 6, a plurality of studs 11 are protruded on both surfaces of the pipe passing gusset plate 10 and the studs 11 are inserted into the high toughness FRC material 6 as shown in FIGS. By burying, the tensile strength of the high toughness FRC material 6 can be effectively transmitted to the gusset plate 10 through a pipe.
The joining strength is also improved.

FIGS. 7 and 8 show a case where a plurality of Kaiser streaks 13 are protruded from the pipe passing gusset plate 10, and the operation and effect are the same as those in the case where the stud 11 is provided.

The first embodiment is the case of the truss beam 1, but a second embodiment will be described in which the present structural material is used for the brace 14 in a rigid frame with a brace as shown in FIG. Also in this case, similarly to the first embodiment, the inside of the hollow steel pipe 7 as the brace 14 is filled with the tough FRC material 6.

As a result, as shown in FIG. 9, the brace 14 has the bending strength and high toughness of the high toughness FRC material 6 as compared with the existing materials such as conventional mortar and steel fiber concrete (SFRC) as shown in FIG. As shown in the figure, in the compression behavior, the buckling strength is larger than that of the conventional concrete-filled steel pipe or hollow steel pipe, and the subsequent reduction in the strength is suppressed, so that the steel has high strength and high toughness.

Further, since the tough FRC material 6 has a good tensile behavior, the tensile strength is improved as compared with the conventional concrete-filled steel pipe or hollow steel pipe as shown in FIG.

As shown in FIG. 16, the joint structure of the brace 14 with the column 9 and the beam 16 is, for example, a cross pipe gusset 15 having a side cross shape in which two plates are crossed in a cross shape.
The brace 14 is joined to the column 9 or the beam 16 by the bolt 12 through the through hole. The gusset 15 is inserted into a slit provided at the joint end of the steel pipe 7 to join the steel pipe 7.

In the case of such a joint structure, the cruciform pipe passing gusset 15 is buried in the high toughness FRC material 6 filled in the steel pipe 7, and as shown in FIGS. By projecting a plurality of studs 11 on both sides of the pipe passing gusset 15 and embedding the studs 11 in the high toughness FRC material 6, the tensile strength of the high toughness FRC material 6 is effectively applied to the cross pipe passing gusset 15. And the joint strength is also improved. In the figure, reference numeral 17 denotes a bolt hole for joining the cross-tube gusset 15 to the joint between the column 9 and the beam 16.

As shown in FIG. 19, a plurality of holes 18 are formed in the plate of the gusset 15 instead of the studs 11, and the steel pipe 7 which becomes the brace 14 is formed through the holes 18. The tensile strength of the filled high-toughness FRC material 6 can be effectively transmitted to the gusset 15 through the cross tube, and the joining strength between the brace 14 and the column 9 or the beam 16 is improved.

FIGS. 20 and 21 show a case where a gusset for joining the brace 14 to the column 9 or the beam 16 is provided with an end plate 19 for joining the steel tube 7 so as to close the end opening thereof.
A plurality of studs 11 are protruded from one surface of the end plate 19 by welding, and the studs 11 are buried in a high toughness FRC material 6 filled in a steel pipe 7, thereby forming a high toughness FRC material 6. This effectively transmits the tensile strength of the gusset to the gusset and improves the joint strength between the brace 14 and the column 9 or the beam 16.

FIG. 22 also shows that when an end plate 19 is provided on a gusset that joins the brace 14 to the column 9 or the beam 16, a plurality of deformed reinforcing bars 20 are projected from one surface of the end plate 19 by welding. The deformed reinforcing bar 20 is buried in the high toughness FRC material 6 filled in the steel pipe 7, thereby effectively transmitting the tensile strength of the high toughness FRC material 6 to the gusset, and the brace 14, the column 9, the beam 16 and the like. Improve the bonding strength.

[0052]

As described above, when the structural material of the present invention is used to form a truss chord or brace with a hollow steel pipe, the steel pipe is filled with a high toughness fiber reinforced cement composite material (FRC material). The buckling strength and toughness of truss chords and braces are improved by the strength and toughness of this high toughness FRC material, especially in CFT truss beams.
The conventional stiffeners such as lateral stiffeners can be saved, the cost can be reduced, and the toughness can be obtained even in the CFT brace without uneconomical structural design.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a first embodiment of a truss structural member of the present invention.

FIG. 2 is a longitudinal side view of a chord portion showing a first embodiment of the truss structural member of the present invention.

FIG. 3 is a longitudinal sectional side view showing another example of a chord portion showing the first embodiment of the truss structural member of the present invention.

FIG. 4 is a front view of a joint with a column, showing the first embodiment of the truss structural member of the present invention.

FIG. 5 is a front view of a main part of a joint portion with a column showing the first embodiment of the truss structural material of the present invention.

FIG. 6 is a longitudinal sectional side view of a main part of a joint portion with a column showing the first embodiment of the truss structural material of the present invention.

FIG. 7 is a front view of another example of the main part of the joint part with the column showing the first embodiment of the truss structural material of the present invention.

FIG. 8 is a longitudinal sectional side view of another example of a main part of a joint portion with a column showing the first embodiment of the truss structural material of the present invention.

FIG. 9 shows a high toughness FR used in the truss structural material of the present invention.
It is a graph which shows the bending performance of C material.

FIG. 10 shows a high toughness F used in the truss structural material of the present invention.
It is a graph which shows the tensile performance of RC material.

FIG. 11 is a graph showing the relationship between the end moment and the deflection angle of a truss beam subjected to one-way equal bending by the truss structural member of the present invention.

FIG. 12 is an explanatory view showing a conventional concrete-filled steel pipe truss.

FIG. 13 is an explanatory view showing another example of a conventional concrete-filled steel pipe truss.

FIG. 14 is a graph of a conventional concrete-filled truss or a hollow steel pipe truss in a two-span truss showing the relationship between the end moment and the deflection angle of a truss beam subjected to uniform bending in one direction.

FIG. 15 is a graph of a conventional truss-filled truss or hollow steel pipe truss truss beam subjected to one-way bending in one direction, showing the relationship between the end moment and the deflection angle of a four-span truss.

FIG. 16 is a front view showing a second embodiment of the truss structural member of the present invention.

FIG. 17 is a front view showing a first example of a main part of a joint part with a column showing a second embodiment of the truss structural material of the present invention.

FIG. 18 is a longitudinal sectional side view showing a first example of a main part of a joint portion with a column showing a second embodiment of the truss structural material of the present invention.

FIG. 19 is a front view showing a second example of a main part of a joint portion with a column, showing a second embodiment of the truss structural material of the present invention.

FIG. 20 is a longitudinal sectional front view showing a third example of a main part of a joint portion with a column showing a second embodiment of the truss structural material of the present invention.

FIG. 21 is a side view showing a third example of a main part of a joint part with a column showing a second embodiment of the truss structural material of the present invention.

FIG. 22 is a longitudinal sectional front view showing a fourth example of a main part of a joint part with a column showing a truss structural member according to a second embodiment of the present invention.

FIG. 23 is a graph of compression behavior showing a second embodiment of the truss structural member of the present invention.

FIG. 24 is a graph of tensile behavior showing a second embodiment of the truss structural member of the present invention.

FIG. 25 is a graph showing the compression behavior of a conventional concrete-filled steel pipe member.

FIG. 26 is a graph showing the tensile behavior of a conventional concrete-filled steel pipe member.

FIG. 27 is a graph showing the relationship between horizontal load and deformation when a hinge is formed at the center of a beam in a rigid frame with a concrete-filled steel pipe brace.

FIG. 28 is a graph showing the relationship between horizontal load and deformation when a hinge is formed at the center of a beam in a rigid frame with hollow steel tube braces.

FIG. 29 is a graph showing a relationship between a horizontal load and a deformation when a beam center is retained in a rigid frame with a concrete-filled steel pipe brace.

FIG. 30 is a graph showing a relationship between a horizontal load and a deformation when the center of the beam stays in a rigid frame with a hollow steel pipe brace.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Truss beam 2 ... Upper chord material 3 ... Lower chord material 4 ... Diagonal material 5 ... Concrete 6 ... High toughness fiber reinforced cement composite material (FRC material) 7 ... Steel pipe 8 ... Hollow part 9 ... Column 10 ... Pipe passing gusset plate 11 ... Studs 12 ... Bolts 13 ... Kaiser bars 14 ... Braces 15 ... Cross tube gussets 16 ... Beams 17 ... Bolt holes 18 ... Hole 19 ... End plates 20 ... Deformed bars

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsushi Shikada 2-9-1-1, Tobita-Shi, Chofu-shi, Tokyo Kashima Construction Co., Ltd. (72) Inventor Yukio Hayashi 1-2-1, Moto-Akasaka, Minato-ku, Tokyo 7 Kashima Construction Co., Ltd. (72) Inventor Kenichi Kono 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Nobuaki Yoshioka 1-3-3 Moto-Akasaka, Minato-ku, Tokyo No. 8 Kashima Construction Co., Ltd. Tokyo branch F term (reference) 2E163 FA12 FB09 FB32 FF17

Claims (8)

[Claims] 1. A truss structural material used as a truss beam, characterized in that a steel pipe serving as an upper chord and / or a lower chord is filled with a high-toughness fiber-reinforced cement composite material (FRC material). Truss structural material. 2. A high toughness fiber reinforced cement composite material (F
The truss structural material according to claim 1, wherein the RC material) fills only a part of the steel pipe. 3. A high toughness fiber reinforced cement composite material (F
The truss structural material according to claim 1, wherein the RC material is filled so as to form a hollow portion over the entire length or a part of the steel pipe. 4. A truss structural material used as a brace having a rigid frame structure, wherein a steel pipe is filled with a high toughness fiber reinforced cement composite material (FRC material). 5. A stud, a Kaiser streak, a plate attached to an end of a truss upper chord, lower chord and a brace.
A member for transmitting the tensile strength of a high-toughness fiber-reinforced cement composite material (FRC material), such as a deformed reinforcing bar, is attached to the plate, and this transmission member is embedded in the high-toughness fiber-reinforced cement composite material (FRC material). The structural material according to claim 1. 6. A pipe-through type gusset plate to be joined to the upper chord, lower chord and end of a brace of a truss,
The structural material according to any one of claims 1 to 4, wherein a plurality of holes are provided for transmitting a tensile strength of a high-toughness fiber-reinforced cement composite material (FRC material) to the gusset plate. 7. A high toughness fiber reinforced cement composite material (F
RC material) is a crack-dispersed type exhibiting a tensile strain of 1% or more in a tensile test of a cured body of an age of 28 days,
The PVA short fiber of the following [F1] is used in a water-cement ratio (W / C).
× 100) In a matrix of a mixture having a sand-cement ratio (S / C) of not more than 1.0 (including 0) having a sand-cement ratio of not less than 40%,
Over to 3 vol. The structural material according to any one of claims 1 to 6, wherein the structural material is randomly dispersed and compounded in a three-dimensional direction at a compounding amount of%. [F1] Fiber strength: 1000 to less than 1500 MPa. Apparent fiber strength: 700 to less than 1000 MPa. Fiber diameter: 40-50 μm. Fiber length: 5-20 mm. 8. A high toughness fiber reinforced cement composite material (F
RC material) is a crack-dispersed type exhibiting a tensile strain of 1% or more in a tensile test of a cured body of an age of 28 days,
The PVA short fiber of the following [F2] is used in a water-cement ratio (W / C).
× 100) is 30% or more and the ratio of sand cement (S / C)
Is 1.0 or less (including 0)
3 vol. The structural material according to any one of claims 1 to 6, wherein the structural material is randomly dispersed and compounded in a three-dimensional direction at a compounding amount of%. [F2] Fiber strength: 1500 MPa or more and 2400 MPa or less. Apparent fiber strength: 1800MP over 1000MPa
a or less. Fiber diameter: 50 μm or less. Fiber length: 5-20 mm.