JPH052073B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a multi-layer seismic isolation and damping structure applied to high-rise buildings and the like. (Conventional technology) In conventional multi-story structures such as high-rise buildings,
Generally, structural members such as columns, beams, walls, and floors are formed as one piece. In this case, each of the above-mentioned constituent members together exerts a resistance force against seismic force and wind load. FIG. 5a shows a conceptual diagram of the conventional structure,
FIGS. 5b, c, and d show the vibration model, the primary mode, and the secondary mode during vibration, respectively. (Problems to be Solved by the Invention) Therefore, the conventional structure described above has the following problems. () Since structural members such as columns, beams, walls, and floors are designed as one unit, the degree of freedom in designing such as floor plan and vibration characteristics of the entire frame is limited. () Because it is a multi-layered monolithic structure, the stress at the legs, which are the supporting ends of the entire structure, is large, and the displacement is larger at the top. () Since the entire structure shakes due to earthquakes and wind, it is difficult to control the vibrations caused by these, or the vibration control mechanism becomes a major problem. () If a defect such as damage occurs to a part of the structure, the effect will spread to the entire structure. () Since the probability that an earthquake and wind will occur at the same time is low, both loads are not considered simultaneously in the design. However, there is a possibility that these events occur simultaneously, and in that case, the entire structure is at risk. The present invention was proposed for the purpose of solving the problems of the prior art. (Means for Solving the Problems) In order to achieve the above-mentioned object, the multilayer seismic isolation and damping structure according to the present invention has the following structure: A group of small frames each consisting of a single-layer or multi-layer floor or beam floor is suspended and supported from the beams of the large frame via suspension materials while maintaining clearance with the large frame, and Each floor is fixed to the tip and middle of the suspension material. Further, in the invention according to claim 2, the small frame is constructed by layering a plurality of single-layer suspended small frames. Furthermore, the invention according to claim 3 provides that a vibration damping device is interposed between the floor or beam floor of the small frame and the large frame, so that vibration of the small frame in the structure can be effectively controlled. Since the small frame was suspended from multiple points, the top of the small frame was suspended from one point of the large frame.
Unlike when suspended from a point, there is no rotational movement around the support point. (Function) Since the present invention is configured as described above,
The large frame consisting of columns and beams not only protects the interior space from the outside, but also mechanically supports vertical loads and resists wind pressure. Regarding seismic force, in each layer space of the large frame, a group of small frames suspended from the beams of the large frame with clearance from the large frame have long-period characteristics. It has a flexible structure with only a small seismic force acting on it. Further, in the invention of claim 2, a multi-layer small frame consisting of a plurality of floors or beam floors is constructed in the internal space of the large structure by stacking single-layer suspended small structures,
It is possible to adjust the natural period of vibration of the suspended small frame that is the supported body. Furthermore, in the invention according to claim 3, vibration control of the small frame is performed by a vibration damping device interposed between the floor or beam floor of the small frame and the large frame. (Embodiments) The present invention will be described below with reference to illustrated embodiments. In Figures 1 and 2, A represents column 1 and beam 2.
It is a large multi-layered structure constructed of , with an outer wall 3 attached to its outer periphery to protect the interior space from wind and rain. In the figure, 2' is a connecting material, 4 is an underground wall, 5 is a foundation, and 6
is the roof and B is the ground. In the internal space of each layer in the large frame A, a small frame group C consisting of a multi-layered or single-layer floor 7 or a beam floor is connected to the large frame A from the beam 2 of the large frame A via a suspension material 8. They are suspended and supported with a clearance D between them. In this way, according to the embodiment, since the small frame groups C are arranged in the internal space of each layer of the large frame A, the vibration properties of each small frame group C can be set independently. It becomes possible. Further, the large frame A supports vertical loads and resists wind pressure. Therefore, against earthquake force, beam 2 of the large structure A
Since the small frame group C suspended and supported from the ground is a flexible structure with long-period characteristics, it becomes a seismic isolation frame and only a small seismic force acts on it. In addition, in the event of an earthquake, the relative displacement between the two is absorbed by the clearance D between the floor 7 of the small frame group C and the large frame A. FIG. 4 shows the vibration properties of the above example, and FIG. 4 a shows a conceptual diagram of the multilayer seismic isolation and damping structure,
FIG. 4b shows its vibration model, FIG. 4c shows its primary mode, and FIG. 4d shows its secondary mode. The space in the column 1 of the large frame A is used as a vertical distribution shaft for elevators, equipment piping, etc., and the floor where the beam 2 is installed is used as an equipment piping route, and the upper part of the connecting member 2' is used as an in-plane distribution shaft. It can be used as a passageway or equipment piping route. FIG. 3 shows another embodiment of the present invention, in which the floor 7 of the small frame group C extends over the connecting member 2' so as to have a clearance D between it and the outer wall 3,
Increased effective floor space. FIG. 6 shows the acceleration response curves of the multilayer seismic isolation and damping structure and the conventional monolithic structure, and shows the case of a 12-story building. In the case of an integral frame, the primary period T ₁ is T ₁ ≈0.1 N=1.2 sec (short period). In the case of the present invention, the primary period T ₁ is

[Formula] (long period). However, the height of each floor shall be 3.5m, and the entire building shall be constructed of three groups of small frames each consisting of four floors. l = 3.5m x 4th floor = 14m g = 9.8m/sec ^2In the above acceleration response curve, in the case of an integral frame, the acceleration response value Sa at point A corresponding to the first period _T1 is as follows. Become. Sa (T=1.2sec)=C/1.2ag However, Sa=C/Tag C: Constant T: Period ag: Earthquake acceleration In addition, in the case of the present invention, B corresponding to the first period T ₁
The acceleration response value Sa at a point is as follows. Sa (T = 7.5sec) = C/7.5ag Therefore, the ratio of the acceleration response values of the frame of the present invention and the conventional integral frame is C/7.5ag: C/1.2ag = 1.2/7.5 = 1/6.25, and this It can be seen that according to the frame of the invention, the acceleration response value is significantly reduced. 7 and 8 show still another embodiment of the present invention, in which a vibration damping device is installed between the floor 7 or the beam floor and the connecting member 2' or the beam 2 in the small frame group C.
A damper 9 or a jacking device with an automatic control device is installed to control the vibration of the small frame group. In the figure, 10 is a slide mechanism that connects the damper 9 and the floor 7, and a chevron-shaped connecting piece 1 is fixed to the floor 7.
A slot 10b is provided in the slot 0a, and a bolt 10c loosely inserted into the slot 10b connects the chevron-shaped connecting piece 10.
a and a chevron-shaped connecting piece 10d fixed to the tip of the piston rod of the damper 9. (Effects of the Invention) As described above, the multilayer seismic isolation and vibration damping structure according to the present invention has a large frame consisting of columns and beams, a single-layer or multi-layer floor, or a group of small frames consisting of a beam floor. By separating the small frames and suspending them from the beams of the large frame through suspension materials while maintaining clearance with the large frame within the internal space of each layer of the large frame, the floor plan can be improved. The degree of freedom in design can be expanded, such as by setting vibration characteristics. In addition, as mentioned above, the small frames are suspended and supported from the beams of the large frame, so the displacement of the small frames during an earthquake is not as large as the upper part, and furthermore, the stress of the large frame structure is also I don't concentrate on it. Furthermore, since the large outer frame resists wind pressure, the small internal structures are not affected by wind vibration or stress, and the small structures within the large structure have a suspension structure that provides long-period seismic isolation. Since it has a vibration-damping structure, shaking and stress caused by earthquakes are reduced. Also, since the suspension material structure has low horizontal rigidity, vibrations can be easily controlled. Furthermore, since the small frame group is a frame independent of the large frame, the influence of structural defects in the small frame group on the entire structure is reduced. Furthermore, since the small frame group has a seismic isolation and vibration damping structure, it is possible to reduce seismic force, and even if an earthquake and a typhoon occur simultaneously, the safety of the entire frame can be ensured. The invention of Claim Hole 2 is such that the small frame has multiple layers of single-layer suspended small frames.
Each frame group is a multi-layered frame with a floor placed in the middle, and the small frames do not move as a unit, allowing for multiple degrees of freedom of movement, preventing concentration of inertia and vibration control. becomes easier. The invention of claim 3 is such that the vibration of the small frame group is controlled by interposing a vibration damping device between the floor of the small frame group or the beam floor and the large frame. It is.

[Brief explanation of the drawing]

1 and 2 are a longitudinal sectional view and a plan view showing an embodiment of a multi-layer seismic isolation and damping structure according to the present invention, respectively, and FIG. 3 is a plan view showing another embodiment of the present invention. Figures 4 and 4 are explanatory diagrams showing the vibration properties of a multilayer seismic isolation and damping structure, Figure 4a is its conceptual diagram, and Figure 4b
is its vibration model, Figure 4c is its first mode,
FIG. 4d shows the secondary mode. Figure 5 shows the vibration properties of a conventional integral frame, Figure 5a is its conceptual diagram, Figure 5b is its vibration model, Figure 5c is its primary mode, and Figure 5d is its secondary mode. Indicates mode. FIG. 6 shows analytical values of the primary natural period and acceleration response values of the structure of the present invention and the conventional integral frame.
FIG. 7 is a plan view showing still another embodiment of the present invention;
FIG. 8 is a view taken in the direction of the arrows in FIG. 7. A...Large frame, C...Small frame group, D...Clearance, 1...Column, 2...Beam, 7...Floor, 8...
Suspension material, 9...damper.

Claims (1)

[Scope of Claims] 1. In the internal space of each layer of a single-layer or multi-layer large frame consisting of columns and beams, a group of small frames each consisting of a single-layer or multi-layer floor or beam floor is installed within a clearance gap with the large frame. The structure is suspended and supported from the beams of the same large frame via suspension materials while maintaining the same structure, and each floor of the small structure is fixed to the tip and middle part of the suspension material. Seismic isolation and damping structure. 2. The multi-layered seismic isolation and damping structure according to claim 1, wherein the small frame has a plurality of layers made by stacking single-layer suspended small frames. 3. The multilayer seismic isolation and damping structure according to claim 1, wherein a vibration damping device is interposed between the floor or beam floor of the small frame and the large frame.