JP4994009B2 - Buildings with steel frame vibration control frames - Google Patents

Description

  The present invention relates to a building having a steel frame, and more specifically to a frame in which load concentration in XY directions applied to corner columns is reduced and a building having the frame.

  In a framed structure building having a substantially rectangular plane, if the column beam is a rigid frame in both the X direction (for example, the longitudinal direction of the building) and the Y direction (for example, the lateral direction of the building), the corner column (at the corner of the building plane) Columns other than (positioned columns) can be made of steel with a low workability, such as H-shaped steel, so the cost is relatively low. Must be used. This is because the corner column is a column having an X composition plane (a surface constituted by column beams arranged in the X direction) and a column having a Y composition surface (a surface constituted by column beams arranged in the Y direction). For this reason, it is necessary to have the prescribed rigidity and strength in both X and Y directions, whereas the H-shaped cross-sectional column has a remarkable strength and rigidity around the weak axis compared to the rigidity and strength around the strong axis. This is because the H-shaped cross-section column cannot generally reasonably satisfy the required rigidity and strength in both XY directions because of its low height.

  In addition, since the corner pillar of a frame structure building having a substantially rectangular plane has high rigidity in both X and Y directions, it is inevitably necessary in the actual earthquake in which the X direction seismic force and the Y direction seismic force act simultaneously. A large axial force and bending moment act as compared with the inner column (column that is not the end of the construction surface).

  On the other hand, in recent years, various damping dampers that absorb vibration energy are often installed in the framework to reduce the damage to the structural framework of the building during a large earthquake. There are many restrictions on the installation location, such as installation in the wall around the core of the building, under the floor, or behind the ceiling so that ventilation and lighting are not obstructed. In addition, these damping dampers are designed to function actively in small and medium earthquakes as well as in large earthquakes, so it is easy to inspect damper damage even after large earthquakes and even after small and medium earthquakes, It is desirable to install it so that it can be easily replaced in case of damage, but it is not easy to inspect and replace the damping damper installed in the wall around the core, under the floor, or behind the ceiling.

  Furthermore, even when it is desirable to arrange vibration damping dampers that exhibit the same effect on both XY structural surfaces, it is generally not necessary to arrange vibration damping dampers so as to exert vibration damping effects on both XY structural surfaces. Have difficulty.

Furthermore, when seismic force is applied to buildings with high aspect ratios such as high-rise buildings and pencil buildings, the bending deformation of the frame is dominant for the interlaminar displacement especially in the high-rise part of the building. There is a problem that the vibration control effect by the brace type or the stud type vibration damper that exhibits the lowering of the height is lowered as the high-rise part increases. As a prior art for this problem, a method has been proposed in which two multi-layer shear walls are provided in a building and the two multi-layer earthquake walls are connected by a boundary beam damper. This method can only be applied to a limited number of cases, for example, because there are restrictions on the function of the building in installing two of them side by side.
JP 2000-328810 A JP 2006-138127 A

In order to solve the above-described problems of the prior art, the present invention provides:
In a building with a frame structure having a substantially rectangular plane,
The X composition plane and the Y composition plane constituting the outer portion of the building in the X direction and the Y direction are respectively a column having high bending rigidity in the X direction and the Y direction, respectively, Including beams in the Y direction,
The end column of the X plane is located outside the Y plane, and the end column of the Y plane is located outside the X plane,
The end columns adjacent to each other in the X and Y planes are connected in an oblique direction in plan view by XY connecting beams,
The XY connecting beam proposes a building having a frame that yields before the surrender of the column beams constituting the X and Y structural surfaces in the event of an earthquake.
In the present invention, the substantially rectangular plane means a geometric rectangle and a parallelogram, a trapezoid, a nonparallel parallel, or a shape including a concave portion or a convex portion. Moreover, an edge part column means a pair of column located in the outermost side among the columns which comprise X or a Y surface. Having high bending rigidity in the X and Y directions means that the bending directions around the strong axis correspond to the X and Y directions, respectively.

  In the present invention, the X and Y structural planes may constitute the main earthquake resistant frame of the building. Further, the X and Y structural surfaces are seismic frames that constitute the outer portion of the building. However, seismic frames or non-seismic frames may be provided on the outer side. In the above-mentioned building, all the columns constituting the X and Y planes may be H-shaped steel, but the columns other than the end columns may be box-shaped.

  In the present invention, the XY connecting beam preferably acts as a hysteresis damper. The XY connecting beam may be an H-shaped cross-section member in which the web shears and yields. Further, the end column and the XY connecting beam may be bolted together easily via an end plate.

  In the present invention, in the above-mentioned building, the yield strength of the XY connection beam may be higher as the upper floor, or the XY connection beams may be spaced closer to the upper floor.

  According to the present invention, it is not necessary to use a steel pipe column or a cross H column that has a high degree of processing and therefore high cost for the corner column, and the end columns of the X and Y planes that replace the corner column are also like H-shaped steel. Since it is possible to use a steel having a low workability and thus a relatively low cost, the cost of the building can be reduced. This is because the end column at the end of the composition plane does not serve as the corner column of the X and Y composition plane, so stress does not become excessive with respect to seismic forces in both the X and Y directions.

  According to the present invention, the XY connecting beam that acts as a damping damper is provided in the plane in an oblique direction (not parallel to either the X direction or the Y direction). It works effectively against deformation in the Y direction. Moreover, in this invention, since the damping damper will be provided in the horizontal direction in the four corners of a building, the design freedom of interior space of a building is not inhibited. Since it is possible to make the seismic frame including the vibration damper only on the outer periphery of the building and not to provide the seismic frame in the internal space, it is possible to secure a spacious and highly flexible internal space. At the same time, the degree of freedom of core placement is improved.

  When the X and Y structural surfaces are the outermost layers of the building, the inspection and replacement of the XY connecting beams are particularly easy. The ease of replacement is further improved if the end column and the XY connecting beam are easily bolted and detached via the end plate. Of course, it is free to provide a vibration damper other than the XY connecting beam at an appropriate position of the building.

  Further, in the case of the building according to the present invention, the vibration damping effect is effective even in the case of a high-rise building or pencil building where the bending deformation component is dominant in the interlayer deformation. When the present invention is applied to a building having such a large height-to-width ratio, the shearing force acting on the hysteresis damper in the upper layer portion is larger than that in the lower layer portion, so that the effect of suppressing horizontal deformation of the building is high.

Hereinafter, the present invention will be described in detail with reference to examples. However, it is needless to say that the examples are illustrations for helping understanding of the invention, and the present invention is not limited to these examples.
FIG. 1 shows a beam concealment diagram of a 10-layer frame having a plane of 4 spans × 3 spans to which the present invention is applied, and FIG. 2 shows a shaft assembly diagram. An H-shaped cross-section member is used for each column beam, and the beam is bolted to the column in a split tee format. The strong axes of the pillars constituting the X composition plane are all directed in the X direction, and the strong axes of the pillars constituting the Y composition plane are all in the Y direction. Therefore, the strong axis directions of the end column 100 of the X plane and the end column 200 of the Y plane are orthogonal to each other, and the XY connecting beam 300 is formed between the two end columns 100 and 200 between them. They are provided between them and connected via an end plate. In the beam concealment diagram, the XY connecting beam is provided in a direction rotated approximately 45 ° from the X direction.

  The XY connecting beam is made of a member having an H-shaped cross section, and acts as a shear panel type hysteresis damper by shear yielding of the web. As the steel type of the shear panel, low yield strength steel for building structures having low strength and excellent deformability is optimal, but conventional structural steel materials can also be used. One damper is provided for each layer up to six layers below the building, but two layers are provided for each layer on the seven or more floors. This is to effectively suppress the bending deformation of the upper floor.

  In the embodiment shown in FIGS. 1 and 2, a brace-shaped brace is arranged under the beam at the joint between the column and the beam to enhance the rigidity and strength of the frame and the vibration damping effect. This cane type brace is an example of a buckling restrained brace type vibration damper. The brace is not essential to the invention because it is separate from the present invention. Further, since the beams are bolted to the columns using split tees, the beams can be easily assembled and disassembled, but may be joined by welding or the like.

In this embodiment, since the seismic frame is constituted by the outer frame, substantially all the horizontal loads during the earthquake are borne by the outer frame. Therefore, the pillars in the internal space of the building are intermediate pillars that bear only a vertical load and intermediate pillars that attenuate floor vibration, and the cross section of the pillars in the internal space is smaller than the pillars that constitute the outer frame. Of course, a part of the seismic force may be borne by the internal column beam as long as the degree of freedom of the internal space is not hindered.
The seismic frame to which the present invention is applied is not necessarily the outermost periphery of the building. In that case, the present invention can also be applied to a frame located further on the outer periphery of the X frame and the Y frame to which the present invention is applied, or the present invention can not be applied to an outer frame. is there.

  FIG. 3 is an enlarged perspective view of the end columns 100 and 200 and the XY connecting beam 300. The end column 100 constituting the X plane and the end column 200 constituting the Y plane are connected by XY connecting beams 300 and 310. The end column 100 constituting the X plane is made of H-shaped steel, and its strong axis is the same as that of other columns (columns that are not end portions, likewise made of H-type steel, not shown) that also constitute the X plane. The end column 200 that is parallel to the construction surface and that constitutes the Y construction surface is also made of H-shaped steel, and its strong axis is made of another column that also constitutes the Y construction surface (columns that are not end portions, as well as H-shaped steel. (Not shown) is parallel to the Y plane. The beams 400, 401, 410, and 411 are also made of H-shaped steel. The column beam connection is split tee connection. Further, the vicinity of the joint portion of the column beam is reinforced by a cane-type brace 500, which is a buckling restraint type and acts as a vibration damper.

  The XY connecting beams 300 and 310 extend in the direction of 45 ° with respect to the X and Y planes in the same plane as the beams 400, 401, 410 and 411. The XY connecting beams 300 and 310 are also made of H-shaped steel, and both ends thereof are bolted to the end columns 100 and 200 via end plates 600, 601, 610 and 611.

  FIG. 4 illustrates a deformation state in the X direction during an earthquake of a building to which the present invention is applied. In the figure, the X plane is formed between the end columns 100 and 102. The Y surface is a surface formed from the end columns 200 and 201 in the depth direction of the drawing. At the time of the earthquake, it is considered that both the X and Y composition planes are bending and shearing deformed, but according to FIG. It can be seen that, as a result, a large relative displacement occurs between the end pillars 100 and 200 as it goes to the upper floor.

  In the upper floor of a building having a height higher than the width of the building, such as a high-rise building, the bending deformation is dominant, but in the case of the building to which the present invention is applied, the XY connecting beam is connected to the upper floor. Large deformations are concentrated as you go. This means that when the XY connecting beam acts as a damping damper, it effectively absorbs the vibration energy of the building, especially the vibration energy of the upper floors, and thereby effectively exhibits the damping action. Means. In other words, the present invention is remarkably shown to effectively exhibit a vibration damping action even when used in a building having a height higher than the width.

Beam floor plan of a building to which the present invention is applied A framework diagram of a building to which the present invention is applied Perspective view of end column and XY connecting beam according to the present invention Figure of deformation of building to which the present invention is applied at the time of earthquake

Explanation of symbols

10, 11 Columns composing the X plane (columns other than end columns)
20, 21 Columns composing the Y surface (columns other than end columns)
100 End Column 200 Constructing X Construction Plane End Column 300, 310 Constructing Y Construction Plane XY Connecting Beams 400, 410 Beam 401 Constructing X Construction Plane 411 Beam 500 Constructing Y Construction Plane Cane Type Brace 600, 601, 610, 611 End plate

Claims (1)

In a building with a frame structure having a substantially rectangular plane,
The X composition plane and the Y composition plane constituting the outer portion of the building in the X direction and the Y direction are respectively a column having high bending rigidity in the X direction and the Y direction, respectively, Including beams in the Y direction,
While arranging a brace-shaped brace in the lower beam part of the joint between the column and the beam,
The end column of the X plane is located outside the Y plane, and the end column of the Y plane is located outside the X plane,
The end columns adjacent to each other in the X and Y planes are connected in an oblique direction in plan view by XY connecting beams that act as shear panel type hysteresis dampers against deformation in the X and Y directions ,
The XY connecting beam is a building having a frame that yields before the surrender of the column beams constituting the X and Y planes in the event of an earthquake.

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