JPH11324111A - Balance construction of steel framed beam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the quantity of steel frame and reduce the steel work cost by making a large girder and a small beam to be through beams, and providing pin joints on the effective positrons of members. SOLUTION: In a steel construction of a structure, by making the whole floor bodies of the same floor to be an integrated construction, all horizontal force are borne by vertical braces, as to a vertical load, a large girder 2 is set to be a through girder 5, pin joints 8 are provided on the middle of optional spans, and vertical bending moment and deflection generated in the girder are made small. As a result, the used quantity of steel frame can be remarkably reduced, and the material cost and the work cost can be reduced. The capital 6 and the pedestal 7 of a pillar 1 are pin-joined to bear the vertical load, and similarly the quantity of steel frame and the work cost are reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel beam which can be constructed by connecting a large beam, a small beam and a column by using a one-plate structure of a whole floor to reduce the amount of steel frame used. This is related to the balance structure.

[0002]

2. Description of the Related Art Conventionally, a steel braced structure of a conventional structure employs a method in which a beam is passed through a column and a large beam is pin-joined to the column or rigidly joined by full welding, and small beams are generally pin-joined to a large beam. .

[0003]

The conventional steel-braced structure of a building requires a sophisticated welding technique because the girders and the columns are rigidly joined by full welding through the columns, and the inspection of the welds is expensive. minimum minimum value of bending moment of the beam end against the length l of the vertical such distributed load W and the beam on the beam is not only the moment M ₁ shown in FIGS. 8 and equation 1, the beam center portion bending moment value was adopted uneconomically steel member not only the moment M ₂ shown in FIG. 8 and equation 2. In addition, since a splice connection was required at the intermediate portion of the beam length l for convenience of transportation, there was a problem that the cost of steel frame construction was not reduced.

[0004]

(Equation 1)

(Equation 2)

In addition, when a small beam is joined to a large beam, the minimum value of the bending moment of the beam with respect to the vertical equal load W on the small beam and the length l of the beam is adopted because pin joining is adopted. because not similarly only in the moment M ₃ shown in FIG. 9 and equation (3) there is a problem in that the steel frame construction cost is not cheap.

[0006]

(Equation 3)

[0007]

SUMMARY OF THE INVENTION The present invention relates to a structure constructed by using a steel frame such as an H-section steel as a raw material. The whole floor has a one-plate structure, and the column cap 6 and the column base 7 of the column 1 that supports the vertical load are the pin supports 13 so that the outer wall structure can support lateral seismic force and the like. It is a balance structure of a steel beam characterized by the following.

Further, the small beam 4 is also configured as a through beam 51 similarly to the large beam, and also includes a structure of a construction in which a pin joint 81 is provided in the middle of an arbitrary span.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS That is, in the present invention, a large beam is formed as a through beam 5, a pin joint 8 is provided in the middle of an arbitrary beam, and a column head 6 and a column base 7 of the column 1 are supported by pins. The welding technique becomes unnecessary, and the minimum value of the bending moment at the end of the beam with respect to the vertically uniform load W on the beam is as shown in FIG. Therefore, the moment M ₁ shown in the above equation 1 can be reduced to the moment M ₄ shown in the equation 4, and similarly, the moment M ₁ shown in the equation 3
₃ can be reduced to a moment M ₆ represented by Expression 5. As a result, the splice joint 9 in the middle part of the beam can be eliminated, and the amount of steel frame used can be reduced. As a result, the cost of steel frame construction can be reduced.

[0010]

(Equation 4)

(Equation 5)

Also, when a small beam is joined to a large beam, the minimum value of the bending moment can be reduced by providing a small beam 51 through the small beam 4 and providing a pin joint 81 of the small beam between arbitrary small beams.
The moment M ₁ shown in Equation 1 described above can Chisakuru up moment M ₄ shown in Equation 4, it is possible to reduce the moment M ₃ shown in Equation 3 until moment M ₆ shown by Equation 5 using The amount of steel frames required can be reduced.

[0012]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing a part of the implemented plane, and a pin joint of a large beam and a small beam according to the present invention. FIG. 2 is a shaft assembly diagram showing the inner wall surface that has been implemented.
FIG. 3 is a shaft assembly diagram showing the outer wall surface that has been implemented. In the figure, 1
Is a column, 2 is a large beam, 5 is a through beam, 8 is a pin connection, 4 is a small beam, 51 is a through beam, 81 is a pin connection of a small beam, and 3 is a steel frame brace. Focusing on the fact that stress analysis can be performed as a continuous beam with the column as a supporting point by connecting the girder's capital and column base to the girder with a pin joint, the bending of the second bottom beam end as shown in Fig. A pin joint is provided at an arbitrary position on the first beam so that the moment and the bending moment at the center are approximated. By installing a pin joint at any position on the beam, the steel construction cost for the girder and the column was reduced compared to the past.

The small beam has a large beam as a supporting point, and the small beam is placed at an arbitrary position of the first beam so that the bending moment at the second beam end from the left and the bending moment at the center are approximated as shown in FIG. Steel joint construction cost of small beams by providing pin joints and pin joints of small beams at arbitrary positions on the third beam so that the bending moment at the fourth beam end and the bending moment at the center are similarly approximated Was reduced compared to before. Fig. 3
By arranging the inverted V-shaped brace on the outer periphery of the building in a well-balanced manner, the steel brace was designed to efficiently bear the seismic force and wind pressure based on the theory of the one-plate structure.

FIG. 4 shows a conventional joint between a column and a beam. In this method, butt welding is performed using advanced welding technology due to rigid joining, and splice joining for transportability is indispensable.

FIG. 5 shows a joint which solves the problem of FIG. 4 and corresponds to claim 1 of the present invention. The column is a pin joint, and a vertical load is applied to the lower column via a reinforcing plate 10 attached to the beam. It does not require advanced welding technology. Since the girder is a through beam 5, a simple pin joint 8 is sufficient without splicing.

FIG. 6 shows a conventional joint between a small beam and a large beam. The bending moment of the small beam in this case becomes the stress diagram of FIG. 11, and the steel member is determined by the most unfavorable bending moment at the center.

FIG. 7 shows a joint of a small beam according to the second aspect of the present invention.
When the bending moment becomes smaller as shown in the stress diagram of FIG. 10, the amount of steel frame can be reduced. However, when the span is small, it should be noted that the steel frame amount may not be different from that in the conventional FIG.

The stress diagram shown in FIG. 10 corresponds to claims 1 and 2 of the present invention, and shows an example used for practical design. In the figure, W
₁ , W ₂ , W ₃ , and W ₄ indicate equally distributed loads in the vertical direction.
₁ , l ₂ , l ₃ , and l ₄ indicate the span of the beam when the column is the pin support 13, and M ₄ , M ₅ , M ₆ , and M ₇ indicate the bending moment. A, b, and c indicate the cantilever lengths of the beams for forming through beams.

Next, using the values determined by the bending moment M ₄ at the upper end of the beam end and the bending moment M _{5 at the} lower center of the beam shown in FIG. 10, the cantilever of the beam is calculated from W ₁ and l _{2 in} FIG. By calculating the length a, the pin joint 8 at an arbitrary position of l ₁ in FIG. 10 is determined. Similarly, by using the values of M ₄ and M ₆ in FIG. 10 to calculate the cantilever lengths b and c from W ₃ and l _{3 in} FIG. 10, the pin joint portion 8 at an arbitrary position of l ₃ is calculated. Is determined.

[0020] As a result, the stress of the conventional beam is reduced to M ₄ with respect to M _1, it decreases to M ₇ with respect to M _3, requires only a small steel section used, the result reduces Steel amount it can. In this method, the same treatment is performed even when the equally divided load in the vertical direction is replaced with the concentrated load.

[0021]

Since the present invention is constructed as described above, the following effects are obtained and the construction cost is reduced by 20 to 25% compared to the conventional steel brace structure.

Since the large beam is formed as a through beam, the amount of steel frame of the beam is reduced to 15 to
20% reduction.

Since the small beam is a through beam, the amount of steel frame of the beam can be similarly reduced by providing a pin joint at an effective position on the member.

[0024] By connecting the capital of the pillar and the pedestal with a pin,
This eliminates the need for advanced welding technology, and reduces the time and effort required for processing in the factory and the amount of steel frames used in components.

Since the joints between the columns, the girders, the small beams and the steel braces are connected by bolts, they can be loaded more than conventional steel-frame transportation, and the transportation cost is reduced.

The amount of steel frame of the steel frame structure is 80-100.
kg / m ² , the balance structure of the steel beam of the present invention is 5
Since it can be reduced to ⁵ to 70 kg / m ² , the cost of steel frame construction can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a shaft assembly diagram showing an inner wall surface of the embodiment of the present invention.

FIG. 3 is a frame diagram showing an outer wall surface of the embodiment of the present invention.

FIG. 4 is an explanatory view showing a conventional joint between a column and a beam.

FIG. 5 is an explanatory view showing a joint between a column and a beam according to the present invention.

FIG. 6 is an explanatory view showing a conventional joint between a small beam and a large beam.

FIG. 7 is an explanatory view showing a joint between a small beam and a large beam of the present invention.

FIG. 8 is a stress diagram showing a bending moment of a conventional girder.

FIG. 9 is a stress diagram showing bending moments of conventional large beams and small beams.

FIG. 10 is a stress diagram showing a bending moment when the through beam of the present invention is implemented.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 pillar 2 large beam 3 steel brace 4 small beam 5 through beam 6 column capital 7 column base 8 pin connection 9 splice connection 10 reinforcing plate 11 gusset plate 12 high tension bolt 13 pin support 14 splice plate 51 through beam 81 short beam pin connection

Claims (2)

[Claims] 1. A girder 2 is formed as a through beam 5, a pin joint 8 is provided in the middle of an arbitrary span, and the entire floor of the same floor is formed as a one-plate structure, and a column head 6 and a column 1 for supporting a vertical load. A balance structure of a steel beam, wherein the leg 7 is a pin support 13 and a lateral seismic force or the like is supported by the outer wall structure. 2. The pillars 8 and the pillars 1 for supporting vertical loads, wherein the girder 2 is a through beam 5 and a pin joint 8 is provided in the middle of an arbitrary span. A balance structure of a steel beam in which the leg 7 is a pin support 13 and the small beam 4 is also formed as a small beam 51 like a large beam, so that lateral seismic force or the like can be supported by the outer wall structure.