JP2005273181A - Building structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure sufficient rigidity with a minimum necessary column section.
SOLUTION: Based on a bi-directional frame structure composed of a steel column 1 and steel beams 2 and 3, an H-shaped steel is adopted as a steel column, and its flange 4 is along the beam direction and the web 5 is along the direction between the beams. At the same time, the stiffener 6 made of a precast concrete block is fitted in the space formed by the flange and the web to increase the rigidity of the steel column. The stiffener is fixed to the steel column by inserting the stud 7 implanted in the steel column web into the hole 8 formed in the stiffener and filling the grout. A plurality of stiffeners are stacked in multiple stages in the vertical direction and mounted over the entire length of the steel column, and the grout 9 is filled in the gaps between the stiffeners and the flanges and between the stiffeners. Strength elements such as braces and seismic dampers will be installed at the key points of the girder direction frame.
[Selection] Figure 3

Description

  The present invention relates to a structure of a building, and particularly to a structure suitable for application to a so-called plate-shaped high-rise building.

  As is well known, high-rise or super-high-rise buildings are shaped like towers (towers) that are close to squares or circles in plan view, and horizontally long flat rectangles that are flat in plan view. It is roughly classified into so-called plate-like ones.

  A tube structure can be suitably used as the structure of a tower-like building, but a structure based on a bidirectional ramen structure is adopted because a tube structure is not suitable for a plate-like building. In general.

By the way, in a plate-like building, unbalance is likely to occur in the structural characteristics in the direction of the beam (long side direction) and the direction between the beams (short side direction). In particular, it is possible to provide strength elements such as seismic walls in the beam direction without hindrance, but it is often difficult to provide strength elements in the beam-to-beam direction due to limitations in plan planning. It is not always easy to secure. Therefore, as a structure suitable for application to a plate-shaped building, for example, as shown in Patent Document 1 and Patent Document 2, a high-rigidity core portion is provided on a part of a frame while being based on a bidirectional ramen structure. It has been proposed to install damping dampers and earthquake-resistant walls in such a place.
JP 2001-220816 A JP 09-256469 A

  In the structures shown in Patent Documents 1 and 2, it is possible to ensure the rigidity of the entire building in a well-balanced manner by appropriately arranging the core part and appropriately setting the rigidity in the core part. There are many cases where such a core portion cannot be effectively secured depending on the scale and plan. In particular, in the case where the inter-beam direction is constituted by a single span, it is not practical to secure the core portion because the plan plan becomes extremely inconvenient.

  For this reason, in a plate-shaped building with a single span between beams, it is normal to ensure the rigidity in the beam direction only with a single-span pure ramen frame, and inevitably the column cross section to sufficiently increase the stiffness of the frame. In many cases, a steel reinforced concrete structure or a filled steel pipe concrete structure that can be made to have higher rigidity than a pure steel structure is often adopted. In any case, in a conventional plate-shaped building, especially a building with a pure ramen frame with a single span between the beams as described above, the required cross section of the column is required to ensure the yield strength in order to ensure the rigidity between the beams. In other words, the cross-section required for the building must be considerably larger, which is not preferable in terms of material cost and workability, and the effective area of the room is reduced because the column shape protrudes more than necessary in the room. Therefore, an effective improvement measure has been desired.

  In view of the above circumstances, an object of the present invention is to provide an effective structure capable of ensuring sufficient rigidity with a minimum necessary column cross section.

  The structure of the present invention is based on a bi-directional frame structure composed of a steel column and a steel beam, adopts an H-shaped steel as the steel column, and has a flange arranged along the direction of the beam and a web arranged along the direction between the beams. The space portion formed by the flange of the steel column and the web is fitted with a stiffener made of a precast concrete block for enhancing the rigidity of the steel column.

  In the structure of the present invention, a stud is implanted in the steel column web, and a hole for inserting the stud is formed in the stiffener, and the stud is inserted in the hole of the stiffener to grout. It is preferable to fix the stiffener to the steel column by filling. Further, it is preferable that a plurality of stiffeners are stacked in multiple stages in the vertical direction and mounted over the entire length of the steel column, and grouts are filled between the stiffeners and the flanges and between the stiffeners.

  It should be noted that load-bearing elements such as braces and seismic dampers may be provided at key points in the beam-spanning frame as necessary.

  According to the structure of the present invention, it is basically based on the use of a steel-framed steel column as a ramen frame as the frame in both the beam direction and the beam-to-beam direction, and the steel column has a highly rigid precast concrete block. By inserting and installing a stiffener made of the above, the deformation of the steel column can be constrained by the stiffener and its rigidity can be increased, so that the rigidity of the entire building can be improved without increasing the column cross section. Therefore, it is sufficient that the steel column has the minimum cross section required for securing the proof stress. Further, the stiffening material is simply a precast concrete block, and it is only necessary to attach it to the steel column, so that it does not require much cost and labor, and the cost increase is small compared to pure steel structure.

  In particular, by inserting a stud planted on a steel column into a hole formed in the stiffener and fixing it with a grout, the stiffener can be firmly and firmly fixed, and the work can be done easily and without any hassle. It can be carried out. In addition, by installing multiple stiffeners side-by-side along the entire length of the steel column and filling the gaps around the stiffeners with grout, the stiffening effect of the stiffeners can be reliably obtained. In addition, the mounting work of the stiffener can be easily and reliably performed.

  In addition, by providing seismic elements such as braces and damping dampers in the girder frame, the strength and rigidity of the entire building can be set appropriately in a balanced manner.

  One embodiment of the present invention is shown in FIGS. FIG. 1 shows a frame of a standard floor of a building according to the structure of the present embodiment, where (a) is an overall plan view and (b) is an enlarged view of a column beam joint. The building in the illustrated example is a so-called plate-like high-rise building, and its planar shape is the length in the direction of the beam (long side direction, X direction in the drawing) rather than the width dimension in the beam direction (short side direction, Y direction in the drawing). It has a horizontally long flat shape whose dimensions are several times longer, and its total height is about 5 times larger than the width dimension in the inter-beam direction. The structure of this building is based on a steel-framed bi-directional frame structure. In the example shown in the figure, the crossing direction is a 6-span frame structure, and the inter-beam direction is a single-span frame structure. It is said that.

  1 to 3, reference numeral 1 is a steel column, 2 is a steel beam in the direction of the beam, 3 is a steel beam in the direction of the beam, and the steel column 1 and the steel beams 2 and 3 are both made of H-shaped steel. ing. The H-shaped steel as the steel column 1 has the flange 4 arranged in the direction of the beam and the web 5 in the direction along the direction of the beam. Therefore, the steel beam 2 in the direction of the beam is joined to the web 5 and the direction of the beam The steel frame 3 is joined to the inner flange 4 to constitute the entire frame.

  In this embodiment, the stiffener 6 made of a precast concrete block is attached to the steel column 1. As shown in FIGS. 2 to 3, the stiffener 6 is pre-manufactured to a size that fits tightly in the space formed by the web 5 of the steel column 1 and both flanges 4. Are attached to the both sides of the web 5 in multiple stages in the vertical direction and mounted over the entire length of the steel column 1, so that the steel column 1 has a substantially solid cross section due to the stiffener 6. Restrained by the rigid member 6, the rigidity of the steel column 1, particularly the rigidity in the inter-beam direction, is significantly increased.

  Although the structure and form of mounting of the stiffener 6 on the steel column 1 are not particularly limited, in this embodiment, the stiffener 6 is mounted by the stud 7. That is, studs 7 are planted in advance on the web 5 of the steel column 1 at a predetermined interval, and holes 8 into which the studs 7 are inserted are formed in the stiffener 6. When mounting, the grout 9 is filled in the hole 8 in advance, and the stiffener 6 is pressed against the steel column 1 so that the stud 7 is inserted into the hole 8. As a result, the grout 9 naturally hardens and the stiffener 6 can be firmly fixed to the steel column 1 via the stud 7, and the work is not troublesome. At that time, the hole 8 may be passed through the surface side of the stiffener 6 and the grout 9 may be injected and filled into the hole 8 from the surface side after the stiffener 6 is mounted on the steel column 1. . Of course, the position and number of the studs 7 may be set as appropriate.

  As shown in FIG. 2 (a), the stiffeners 6 may be attached to both sides of the steel beam 2 in the direction of the beam in the column beam joint portion with the same structure. Moreover, as shown in FIGS. 2 to 3, by filling the grout 9 into the gap that remains slightly between the stiffener 6 and the flange 4 and the gap that remains between the stiffeners 6, The stiffening material 6 can be tightly fitted to the steel column 1 so that a stiffening effect can be obtained with certainty, and such a stiffening material 6 can be easily and reliably attached.

  According to the structure of the present embodiment, the rigidity can be increased only by attaching the stiffener 6 to the steel column 1, and therefore the cross section of the steel column 1 is made larger than the size necessary for securing the proof stress. In other words, only by making the steel column 1 have the minimum necessary cross section, the required proof stress and the required rigidity can be ensured together, and as a result, the column shape may overhang more than necessary. In addition, it is possible to suppress a decrease in the effective area of the room due to the column shape. Further, the stiffener 6 is a simple precast concrete block and has a structure in which it is simply mounted on the steel column 1, so that the cost increase and the labor required for mounting the stiffener 6 are not increased. It is small and can be constructed substantially in the same manner as a pure steel structure. For example, it can be said that the structure is much simpler and more effective than a steel reinforced concrete structure or a filled steel pipe concrete structure.

  The frame in the direction of the beam may be a simple frame structure, but as shown in FIG. 1 (a), by providing a seismic element 10 such as a brace or a seismic damper at the main point, the entire building As a result, it is possible to optimally set the proof stress and rigidity required as well without any hindrance. Further, if the span in the beam direction is made as small as about 2.5 to 3.0 m, a small beam can be eliminated at all, which is more advantageous in terms of construction cost and workability.

  Although the position embodiment of the present invention has been described above, the above embodiment is merely an example, and the present invention is not limited to that embodiment.

  For example, in the above-described embodiment, a plurality of stiffeners 6 are stacked in multiple stages in the vertical direction, but if the stiffener 6 can be fitted to the steel column 1 exactly, The shape and dimensions are arbitrary. For example, a long stiffener in which the plurality of stiffeners 6 in the above-described embodiment are connected in advance may be adopted and attached to the steel column 1 in a lump. In addition, it is realistic that the stiffener 6 is fixed through the stud 7 as in the above embodiment, but the present invention is not limited to this, and the stiffener 6 is securely and securely attached without fear of displacement or dropout. If possible, it may be attached, for example, by fastening, bonding or other methods.

  Furthermore, the structure of the present invention is optimally applied to a plate-like high-rise building as in the above embodiment, particularly when the frame structure in the inter-beam direction is a single span, but is not limited thereto. Needless to say, the present invention can be widely applied to buildings of various forms, scales, uses, and floor plans as long as it is based on the ramen structure.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates an embodiment of the present invention, and is a plan view illustrating a building frame according to the structure of the present embodiment and an enlarged view of a column beam joint. It is sectional drawing of a steel frame column. It is a perspective view of a column beam junction part same as the above.

Explanation of symbols

1 Steel column (H-section steel)
2 Steel beam 3 Steel beam 4 Flange 5 Web 6 Stiffener (Precast concrete block)
7 Stud 8 Hole 9 Grout 10 Strength element

Claims (4)

  Based on a bi-directional frame structure with steel columns and steel beams, H-shaped steel is adopted as the steel columns, and the flanges are arranged in the direction of the beam and the web is arranged in the direction between the beams, and the flanges of the steel columns A structure of a building, wherein a stiffener made of a precast concrete block for increasing the rigidity of a steel column is fitted in a space formed by a web and a web.   Studs are implanted in the steel column web, and holes are inserted into the stiffeners, and the studs are inserted into the stiffener holes and filled with grout. 2. The building structure according to claim 1, wherein the stiffener is fixed to a steel column.   A plurality of stiffeners are stacked in multiple stages in the vertical direction and mounted over the entire length of the steel column, and grouts are filled between the stiffeners and the flanges and between the stiffeners. Item 1. A building structure according to item 1 or 2.   4. The structure of a building according to claim 1, 2 or 3, wherein a load bearing element such as a brace or a damping damper is provided at an important part of the frame in the beam direction.

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