JP5403331B2 - Seismic control frame - Google Patents

Description

  The present invention relates to a seismic control frame for a high-rise or super-high-rise building.

When installing dampers on each floor in order to suppress deformation during earthquakes in high-rise or super-high-rise buildings, it is common to place dampers centrally on the core over all floors. As shown in FIG.
FIG. 5 is a schematic diagram of a frame of a high-rise building, in which reference numeral 1 is a column and reference numeral 2 is a beam. Moreover, (a) shows the frame of each floor, (b) shows the frame of the outer periphery, and (c) shows the frame of the core periphery. In the illustrated example, the planar shape of each floor is a square shape of 3 spans × 3 spans as shown in (a), and 1 span × 1 span at the center is defined as the core part 3, and as shown in (c) A damper 4 is installed over the entire layer on a frame around the core portion 3 (core peripheral portion).
In such a case, as the damper 4 installed on the frame around the core, it is most common to use a steel brace damper that operates by interlayer deformation.

  By the way, in a high-rise building or a super-high-rise building, shear force concentrates on the frame around the core during an earthquake, so it is effective to concentrate the dampers 4 on the frame around the core as described above. Especially in high-rise buildings with a high ridge ratio, the deformation in the upper layer may be more pronounced than the shear deformation, in which case the damper 4 installed on the core peripheral frame of the upper layer will function effectively. Therefore, it may be difficult to suppress bending deformation of the entire building.

  Therefore, for example, in Patent Document 1, a core girder frame and an outer frame frame in a high-rise building are structurally separated, and a highly rigid top girder is provided on the top of the core. There is a proposal for a vibration control structure that suppresses bending deformation of the core portion by providing a damper that operates in the vertical direction between them.

Japanese Unexamined Patent Publication No. 7-26786

However, the damping structure shown in Patent Document 1 is not only based on the premise that the core peripheral frame and the outer frame are structurally separated, but also sufficiently high in rigidity, and inevitably has a large cross section and large weight. The top girder must be provided on the top of the building, and since the damper reaction force is received by the column of the outer frame, the axial strength of the outer column must be sufficiently increased.
Therefore, the seismic structure will eventually increase the rigidity of the entire structure, and the structure is extremely complex and its behavior is not always clear, so the design is not easy. Such very special seismic structures are not realistic and have not become widespread.

  In view of the above circumstances, an object of the present invention is to provide an effective and appropriate seismic control frame capable of sufficiently suppressing deformation in a high-rise or high-rise building while being structurally simple and clear.

The present invention is a seismic control frame for high-rise or super-high-rise buildings, and in the lower layer where shear deformation is superior to bending deformation, dampers are installed on the core frame, and bending deformation is superior to shear deformation. In the upper layer, a damper is installed on the outer frame, the damper installed on the core frame in the lower layer is a steel brace damper, and the damper installed on the outer frame of the upper layer is a viscous interphase damper. characterized in that it.

  The seismic control frame of the present invention can effectively suppress the bending deformation of a high-rise building or a super-high-rise building with a high ridge ratio, by properly arranging dampers for the lower layer and the upper layer, respectively. The performance can be sufficiently improved. In addition, the damping effect can be greatly improved without increasing the total number of dampers and the total capacity, compared to conventional damping structures. Therefore, it is possible to realize a seismic control frame which is advantageous in terms of cost as compared with a conventional general seismic control frame and is extremely rational and effective.

It is a figure which shows embodiment of the seismic control frame of this invention. It is a figure for showing an effect similarly. It is a figure which shows other embodiment same as the above. It is a figure which shows other embodiment same as the above. It is a figure which shows the conventional general vibration control frame.

FIG. 1 shows an embodiment of the seismic control frame of the present invention. This is an example of application to a high-rise building having the same form as that shown in FIG. 5, that is, a high-rise building in which each layer has 3 spans × 3 spans and 1 span × 1 span in the center is the core portion 3. As shown in (b) and (d), the damper 4 is installed on the core peripheral frame as in the conventional case in the lower layer, but as shown in (a) and (c) in the upper layer. The damper 4 is omitted from the core frame and the damper 5 is installed in the outer frame instead.
In this case, the lower layer where the damper 4 is installed on the core frame is a layer in which the deformation at the time of earthquake is superior to the bending deformation as in the conventional case, and the damper 5 is installed on the outer frame. The upper layer portion is a layer in which bending deformation is superior to shear deformation, contrary to the lower layer portion, and its boundary is naturally determined by the building ratio of the building and the rigidity of the entire frame.

The dampers 4 and 5 provided in the lower layer part and the upper layer part each have a desired damping effect , and the dampers 4 installed on the core peripheral frame of the lower part are generally installed there conventionally. and steel system of brace damper is.
On the other hand, as the damper 5 installed on the outer peripheral frame of the upper layer part, it is preferable that the reaction force at the maximum deformation is small and it is desired that the view does not hinder the view. And

As described above, by installing the damper 4 around the core in the lower layer where the shear deformation is dominant, the damper 4 is efficiently caused by the shear deformation that is noticeably generated in the lower layer as in the case of a conventional vibration control frame. Operates and has excellent vibration control effect.
On the other hand, since the bending deformation is superior to the shear deformation in the upper-layer core frame, it is not effective to install the damper 4 there. However, the shear deformation in the upper-frame frame is not effective in the core periphery. In general, the damper 5 is effectively operated by installing the damper 5 on the outer frame instead of installing the damper 4 on the core frame in the upper layer. Therefore, deformation in the upper layer can be effectively suppressed, and an excellent vibration control effect can be obtained in the upper layer.

That is, the seismic control frame of this embodiment effectively arranges the dampers 4 and 5 for the lower layer and the upper layer, respectively, thereby effectively bending the entire high-rise or super-high-rise building with a high ridge ratio. It can be suppressed and its seismic performance can be sufficiently improved.
The present invention omits the installation of the damper 4 at a position where the effectiveness is low, and instead installs the damper 5 at a more effective position. Therefore, the total number of dampers compared to the conventional general vibration control frame. In addition to greatly improving the damping effect without particularly increasing the total capacity, it is possible to reduce the damper capacity installed in the lower layer in some cases compared to the conventional one, so the conventional damping control It is advantageous in terms of cost compared to the frame, and can be realized in an extremely rational and effective vibration control frame.

An analysis example for demonstrating the effect of the seismic control frame of the present embodiment is shown in FIG. This is for a 40-story high-rise building with 3 spans by 3 spans as shown in Fig. 1. The length of one side of each floor is 38.4m, the floor height is 5m, 2F more general floors 4m, weight is assumed to 0.6 t / m ^2. The input ground motion was center wave level 2.
Case 1 and Case 2 are comparative examples. Case 1 is the case of the conventional vibration control frame shown in FIG. 5 (with brace dampers installed on all layers only around the core). The damper capacity is doubled (damper plate thickness is doubled).
Case 3 is the case of the seismic control frame of the present invention shown as the above embodiment, and the same brace damper as case 1 is installed on the core peripheral frame of 1 to 20 floors, and the outer frame of 21 to 40 floors is installed. A stud-type viscous damper is installed in the pattern shown in FIG.

The interlayer deformation in each case is shown in FIG. In the case 1 of the comparative example, the response is approximately 1/100 or less in terms of the interlayer deformation angle by the brace damper installed in the lower layer part, but in the case 2 of the comparative example, even though the damper capacity is doubled, Not only is it not effective at all, but it is rather lowered, and it can be seen that there is a limit to the effect of simply installing a damper only around the core.
On the other hand, in the case 3 of the present invention, in the upper layer portion, instead of the core peripheral frame, a viscous damper is installed on the outer frame, so that the response particularly in the upper layer is greatly reduced compared to both cases 1 and 2. The effectiveness of the present invention has been demonstrated.

Have been described embodiments of the present invention above, the embodiment above is merely just one example, FIG. 1 also merely a Frame according to the invention simply shows schematically, Seismic Frames of the present invention lower layer As long as the damper installed on the core frame of the core is a steel brace damper and the damper installed on the outer frame of the upper layer is a viscous interphase damper, the specific arrangement plan of the damper, damper type, capacity, etc. The specifications of the system should be optimally designed so that the desired seismic control effect can be obtained in consideration of various conditions such as the structure and type of the entire building, plan shape, core position and plan shape, and required seismic performance. It ’s fine.

For example, as shown in FIG. 3, in the case of a middle-to-high-rise building, it may be sufficient to provide the dampers 5 provided on the outer frame in several uppermost layers (three layers in the figure).
Further, in the above embodiment, the case where the stud damper is installed between the upper layer pillars is illustrated, but when the outer frame is relatively short span as shown in FIG. It is also possible to omit a part of and to install the stud type damper 5 there.
Of course, in addition to the proper arrangement of the dampers 4 and 5, the braces and other seismic elements may be appropriately arranged at necessary points if necessary.

1 Pillar 2 Beam 3 Core 4 Damper (Installed on the lower part of the core frame)
5 Damper (installed on the outer frame of the upper layer)

Claims (1)

It is a seismic control frame for high-rise or super high-rise buildings,
In the lower layer where shear deformation is superior to bending deformation, dampers are installed on the core peripheral frame, and in the upper layer where bending deformation is superior to shear deformation, dampers are installed on the outer frame .
A damping structure in which the damper installed in the lower part of the core frame is a steel brace damper, and the damper installed in the upper part of the frame is a viscous interphase damper .

Images