JPH0444668B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a construction structure with high seismic stability that can prevent a building from collapsing even in the event of a major earthquake.

[Background of the invention] Conventionally, base isolation structures that reduce the effectiveness of earthquakes applied to buildings are one type of earthquake-resistant structure, and are mainly known as insulation structures, restoring force adjustment structures, energy consumption structures, and automatic control structures. .

An insulating structure is a structure that prevents seismic waves from propagating from the ground to a building. For example, it uses ball bearings, a combination of bearings and springs, etc.
Alternatively, a structure is known in which the bearing supporting surface is made concave to provide restoring force. This structure has the problem of resonance because the building itself has a natural period, so structures using rocking balls are known to prevent this problem. In addition, by understanding the periodic characteristics of seismic force, structures that provide buildings with periodic characteristics that are different from these are also known as insulating structures.

A restoring force adjustment structure is a structure that allows the restoring force characteristics of a building to be adjusted, making the relationship between force and deformation favorable to the properties of the ground and building, in other words, preventing resonant vibrations. It is something. As for the restoring force characteristics, it is desirable that the building has a flexible structure against large accelerations, a rigid structure against large displacements, and is also responsible for energy consumption and can absorb a considerable amount of displacement energy. Specifically, this includes a slit wall structure in which cracks are created in the wall to reduce the rigidity of the wall and disperse stress, and a structure in which openings are intentionally designed in the corners of the wall where stress would concentrate if left as is. It has been known. Also known are multi-column structures in which the restoring force characteristics are adjusted using columns.

An energy-consuming structure is a structure that releases or consumes incoming energy before it is used to destroy the main part of the structure. For example, structures are known in which a damper is installed or a non-main structure of a building is allowed to break, thereby converting energy into frictional heat.

An automatic control structure is a structure that detects an action that attempts to move a building and applies an action that cancels the building's response to this, and can be applied to small buildings. It is said that there is sex.

On the other hand, research on flexible and rigid structures as earthquake-resistant structures is also being actively conducted. Medium- and low-rise buildings have a short natural period, fall under the category of short-period buildings, and are considered to have rigid structures. In addition, high-rise buildings have a long natural period and fall under the category of long-period buildings, and are flexible structures.In other words, flexible structures are earthquake-resistant structures that lengthen the natural period of a building to reduce the seismic force acting on the building. be.

Therefore, conventional earthquake-resistant structures have been either rigid structures or flexible structures, depending on the height of the building.

[Problem to be solved by the invention] In conventional earthquake-resistant structures, buildings have either a rigid or flexible structure, and the entire building is integrated and has a unique period. When the natural period of an object matches the period of seismic motion, there is a problem that resonance occurs and the building shakes violently, resulting in destruction of the building.

In order to solve this problem, it is possible to adopt a seismic isolation structure using an insulating structure using rocking balls as described above, but this is not practical in terms of seismic stability and cost in the case of high-rise buildings. There is a problem that there is a long-period component (5 to 20 seconds)
When subjected to seismic waves of

In addition, in the case of mid- to low-rise rigid structures, the members that support vertical forces also bear horizontal forces, so
If a member is damaged due to horizontal force due to an earthquake, the member supporting the vertical force may also be destroyed.
Another problem was that the building could no longer support the vertical force, and the entire building would eventually collapse.

[Objective of the Invention] Accordingly, an object of the present invention is to provide a construction structure for a building that has excellent seismic stability and can avoid collapse of the building even in the event of a major earthquake.

[Means for Solving the Problems] As a result of extensive studies to achieve the above object, the inventors have arrived at the present invention.

That is, the construction structure of a building according to the present invention is a construction structure of a single building, and the construction structure has a characteristic period shorter than the critical period, which is the value at which the acceleration response of the building to seismic waves in the ground and the maximum seismic acceleration value coincide. It is divided by a vertical cutting line into two types of structures: a flexible structure that has a long period and supports vertical forces, and a rigid structure that has a short natural period that is shorter than the critical period and supports horizontal forces. The structure is characterized in that a plurality of the structural parts are arranged on the outer periphery of the structural part and an inscribed surface of the building, and the two structural parts are connected by a damping mechanism.

Another construction structure of a building according to the present invention is
A flexible structure that supports vertical force and has a natural period longer than a critical period, which is a value at which the acceleration response of the building to seismic waves in the ground matches the maximum seismic acceleration value, which is the construction structure of a single building; It is divided by a vertical cutting line into two types of structures: a rigid structure that has a natural period shorter than the critical period and bears horizontal force, and a structure that is inscribed in the building at the outer periphery of the rigid structure. A plurality of the flexible structure parts are arranged on the surface, and the two structure parts are connected by a damping mechanism.

[Example] Hereinafter, an example of the present invention will be described based on the accompanying drawings.

Example 1 Figure 1 is a schematic plan view showing the first example, and Figure 1 is a schematic plan view showing the first example.
The figure is a schematic elevation view thereof.

In this example, one building is divided into a flexible structure part and a rigid structure part along a vertical cutting line, and two types of structures are created. A plurality of rigid structures are arranged, a gap is provided between the two structures, a damping mechanism is provided between the two structures, and the two structures are connected by the damping mechanism.

In the figure, reference numeral 1 denotes rigid structural parts located at the four corners of the inscribed surface of a rectangular building (preferably a large building or the like). In this specification, shapes and directions are based on plan views unless otherwise specified.

The rigid structure 1 has a rigid structure with a short natural period that bears horizontal force, and although not shown in the drawings, the rigid structure 1 is rigidly joined with other members.Since it is located at a corner of a building, for example, stairs and toilets are provided in the rigid structure. You can also
Alternatively, use pillars at each corner to create a rigid structure.
The entire building may have a large rigid-frame structure. In the above, "bearing horizontal force" means having the ability to resist horizontal force when it is applied due to earthquake vibrations, or having the ability to absorb the force and prevent it from propagating to other structural parts. It is to do so. Furthermore, a short natural period means that the natural period of the building is less than or equal to the critical period. The concept of critical period is based on the definition of ``Umemura'' described in page 45 of the Architectural Structural Design Series ``Architectural Structural Planning'' (published by Maruzen). Immediately assume the acceleration response spectrum of the building to a certain seismic wave (this spectrum differs depending on the ground, seismic waves, etc., so it will be assumed for a certain seismic wave),
The period corresponding to the point where the acceleration response curve of a building intersects with the maximum seismic acceleration is called the critical period, and this critical period is not fixed but varies depending on the ground, seismic waves, etc. A building whose natural period is longer than the critical period is defined as a flexible structure, and a building whose natural period is shorter than the critical period is defined as a rigid structure.

Reference numeral 2 denotes a flexible structure that occupies most of the space in the building, and the structure 2 and the rigid structure 1 located at each corner are connected by a damping mechanism 3, which will be described later. The flexible structure portion 2 may have a flexible structure with a long natural period that supports vertical force.

Primarily supporting vertical forces refers to structures supporting a large portion of the floor area that resist vertical loads and additional bending moments caused by horizontal deformations due to earthquakes.

As mentioned above, a long natural period means that the natural period of a building is greater than or equal to the critical period.

In this embodiment, the difference in the natural period between the rigid structure part 1 and the flexible structure part 2 is preferably far apart, but is not particularly limited. In short, it is sufficient that two types of structural parts having different natural periods are configured into one structure.

The damping mechanism 3 has the function of consuming earthquake energy, and the damping mechanism 3 includes the following:
Various devices used in isolation methods and energy consumption methods known as vibration isolation mechanisms can be used, such as springs and the devices shown in FIGS. 5 and 6. In the device shown in FIG. 5, a rigid structure part 1 and a flexible structure part 2 are connected to each other using a common reinforcing slab surface, and the slab surface of the rigid structure part 1 and the slab surface of the flexible structure part 2 are A slit 4 is provided between the two structures to effectively separate the two structures, exposing the reinforcing bars 5 and utilizing the yielding of that portion for vibration isolation. In the device shown in FIG. 6, the slab surface of the rigid structure section 1 and the slab surface of the flexible structure section 2 are vertically overlapped with a predetermined distance between them, and tubes 7A and 7B are fixed to the tips of both slab surfaces. The cylinders 7A and 7
A core rod 6 is inserted into B, and the yielding of the core rod 6 is used for vibration isolation. In the figure, G is between. In this device, the material of the core rod 6 is iron, steel, lead, reinforced concrete (RC),
glass fiber reinforced concrete (GFRC),
Steel fiber reinforced concrete (SFRC)
Steel, ceramic, etc. can be used as the material for the tubes 7A and 7B. Note that it is preferable that the core rod 6 and the tubes 7A and 7B are in close contact with each other.

Further, as a damping mechanism other than the above, for example, a shock absorber formed by laminating metal plates and rubber in multiple layers, etc. can also be used.

Since this embodiment is configured as described above,
For small and medium-sized earthquakes that occur relatively frequently, rigid structural parts with a short natural period provide a rigid resistance-type seismic function, while for large earthquakes that occur extremely rarely, flexible structural parts with a long natural period provide a seismic resistance function. It exhibits a toughness-resistance type of earthquake resistance function, allowing buildings to avoid collapse due to earthquakes of any size. In addition, both structural parts 1 and 2
Since the comrades are connected by the damping mechanism 3,
Since collisions during earthquakes can be avoided and earthquake energy can be consumed, buildings with low vibration can be realized and buildings can be prevented from collapsing. Furthermore, since the rigid structure is located at each corner and on the internal surface of the building, the vertical force support function of the flexible structure reaches the rigid structure, reducing vertical force fluctuations in the rigid structure. can do. Furthermore, since the rigid structural parts can be formed into pillars and the entire building can be made into a large rigid frame structure, it can be effective in the construction of large buildings and the like.

In the embodiments described above, the arrangement of both structural parts 1 and 2 can be reversed, that is, each corner can be a flexible structural part and the inner side can be a rigid structural part. For example, this is preferable when an elevator or the like is provided at each corner.

Embodiment 2 FIG. 3 is a schematic plan view showing a second embodiment, and this embodiment shows a case where the present invention is applied to a building whose shape is other than square, for example, circular as shown in the figure. . The present invention is also applicable to buildings of various shapes other than the present embodiment. Note that the damping mechanism 3 is omitted in the drawings.

Embodiment 3 FIG. 4 is a schematic plan view showing a third embodiment. In this embodiment, the rigid structure section 1 is located near the center of each side of the outer periphery of the flexible structure section 2, and is inscribed in the building. This shows the case where it is provided on the surface. Note that the damping mechanism 3 is omitted in the drawings.

[Effects of the Invention] According to the present invention, by connecting a rigid structure part and a flexible structure part by a damping mechanism, it is possible to intentionally create two types of structures with different natural periods. It exhibits seismic function against both small and medium-sized earthquakes that occur frequently and large earthquakes that occur rarely, that is, it has seismic stability, and the interaction of two types of structural parts with different functions prevents buildings from collapsing. can be prevented.

In particular, according to the present invention, a plurality of structural parts can be disposed on the outer periphery of one structural part and on the inscribed surface of the building, so it is preferably applied to large buildings and the like.

Note that, for example, as shown by the chain line in FIG. 1, one or both of the structural parts 1 and 2 may have a hollow part 8 such as a courtyard.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view showing the first embodiment;
The figure is a schematic elevational view, FIG. 3 is a schematic plan view showing the second embodiment, FIG. 4 is a schematic plan view showing the third embodiment, and FIGS. 5 and 6 are examples of the damping mechanism. FIG. 1: rigid structure, 2: flexible structure, 3: damping mechanism.

Claims (1)

[Scope of Claims] 1. A construction structure of a single building, which has a natural period longer than the critical period, which is the value at which the acceleration response of the building to seismic waves in the ground and the maximum value of seismic acceleration coincides with each other, and which does not absorb vertical force. It is divided into two types of structures: a supporting flexible structure and a rigid structure that bears horizontal force and whose natural period is shorter than the critical period. A plurality of the rigid structural parts are arranged on the inscribed surface of the structure,
A construction structure of a building, characterized in that both the structural parts are connected by a damping mechanism. 2. A flexible structure that supports vertical force and has a natural period longer than the critical period, which is the value at which the acceleration response of the building to seismic waves in the ground and the maximum seismic acceleration match, in the construction structure of a single building. , is divided by a vertical cutting line into two types of structures: a rigid structure that has a natural period shorter than the critical period and bears horizontal force, and is divided into two types of structures by a vertical cutting line, and is located at the outer periphery of the rigid structure and inside the building. A plurality of the flexible structure parts are arranged on the contact surface,
A construction structure of a building, characterized in that both the structural parts are connected by a damping mechanism.