JPH10121771A - Nuclear-power related building and vibration-isolation structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To scale down a foundation slab while maintaining safety on vibration isolation. SOLUTION: A control building 11 consists of a reinforced-concrete constructed lower layer floor 12 and an uppermost floor 13 built of steel frames on the lower layer floor 12. A roof 14 is supported by steel-framed columns 15 as support elements in the uppermost floor 13 while the uppermost floor 13 is constituted by installing a rubber eastoplastic damper 16, an oil damper 17 and an energy absorption type steel-framed brace 18 as energy absorption members among the columns.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nuclear-related building installed in a nuclear power plant facility and to all seismic control structures requiring seismic control measures against earthquakes, winds and the like.

[0002]

2. Description of the Related Art Reactor buildings and control buildings of nuclear power plants are important structures that must be thoroughly designed for seismic design. Rigid structural design based on thick earthquake-resistant walls has been the basis for shielding. The pursuit of safety is achieved by enlarging the base area of the base plate and increasing the depth of embedding into the ground to release the vibration energy of the building into the ground. I have been.

[0003] Under such circumstances, as one index for judging the seismic safety of a nuclear power plant, there is a ground contact ratio of a basic version, and it is considered that it is appropriate to anticipate occurrence from an engineering point of view. 75% relative to the strongest earthquake (S ₁ earthquake), denied the possibility of generating light of the characteristics in the vicinity of active faults such as the so-called design marginal earthquake (S ₂ earthquake)
A very strict standard of 65%.

[0004]

However, in the RC control building 1 having a large wall thickness as shown in FIG. 4, the weight of each floor is considerably large, and the overturning moment at the lower end of the base slab 2 is correspondingly large. Therefore, in such a building, in order to satisfy the above-mentioned grounding rate, it is necessary to enlarge the basic version to a degree that it is considered functionally unnecessary, and it is possible to achieve the purpose of securing dissipation attenuation. On the other hand, there have been problems such as limited floor plan, high construction cost, large site area, and limited number of floors of the building.

[0005] On the other hand, a number of seismic control methods have recently been developed. For passive control, seismic isolation systems, absorption damping systems, or tuned mass systems such as TMD and sloshing,
For active control, a control force system such as an AMD and a variable stiffness system have been put to practical use.

Of these, TMD (Tuned Mass Dampe
As can be seen from the alias of dynamic damper, r) is to reduce the vibration of the structure body by installing an additional mass body on the structure body and tuning the vibration period of the additional mass body to the structure body. However, since the vibration mechanism of such an additional mass body does not require the structure in its original function, the construction cost is increased by the cost required for the vibration mechanism, and only by the installation space. There has been a problem that the floor area available for the intended use is reduced.

The present invention has been made in view of the above-described circumstances, and has as its object to provide a nuclear-related building capable of reducing the size of a base plate while maintaining seismic safety.

Another object of the present invention is to provide a vibration control structure capable of reducing the installation cost of the vibration mechanism of the additional mass body and effectively using the installation space for its intended use.

[0009]

In order to achieve the above-mentioned object, a nuclear-related building according to the present invention is, as described in claim 1, provided with a lower floor constructed of a concrete structural element and a floor above the lower floor. It consists of a top floor made of steel frame, on which an energy absorbing member is installed.

Further, in the vibration control structure of the present invention, as described in claim 2, horizontal elements such as a roof and a slab constituting an upper floor and supporting elements such as pillars and braces for supporting the horizontal elements are respectively provided in a lower layer. The weight of the horizontal element and the horizontal rigidity of the support element are set so as to be a spring and an additional mass body of a dynamic damper that suppresses floor vibration.

Further, in the vibration control structure of the present invention, the upper floor is made of a steel frame, and a part of the support element is made of an energy absorbing type steel brace.

Further, in the vibration damping structure of the present invention, the horizontal rigidity of the support element is finely adjusted by an attachment amount or an attachment strength of a brace constituting the support element.

In the nuclear power-related building of the present invention, the top floor is constructed of a steel frame and an energy absorbing member is installed on the top floor. Therefore, the response shear force of the top floor during an earthquake is reduced as compared with the conventional case in which the top floor is constructed of concrete structural elements, and the overturning moment at the lower end of the foundation slab is correspondingly reduced.

In the vibration damping structure of the present invention, the vibration of the lower floor is suppressed by the inertia force of the horizontal element of the upper floor, which is the additional mass body, resonating with the lower floor. Since it is also used as a roof or slab which is originally required as a structure, there is no need to separately install an additional mass body as in a normal dynamic damper. In addition, since the supporting element for supporting the horizontal element is also used as a column or a brace originally required as a structure, there is no need to separately install a spring of an additional mass body as in a normal dynamic damper.

The upper floor may be constituted by only the uppermost floor, or may be constituted by several floors including the uppermost floor. Further, the vibration control structure of the present invention may be applied to a nuclear-related building. In such a case, the response shear force during an earthquake is significantly reduced over all floors as compared with a conventional nuclear-related building without a damping mechanism, and the overturning moment at the lower end of the foundation slab is also significantly reduced.

Here, when the upper floor is made of a steel frame and a part of the support element is made of an energy absorbing steel frame, the roof or slab which is an additional mass body of the dynamic damper is shaken by the energy absorbing steel frame. Although it is absorbed by the brace, such a brace can also be used as a structural element originally required as a structure, so that it is not necessary to separately provide a damping mechanism for an additional mass body as in a normal dynamic damper.

Further, when the horizontal rigidity of the support element is finely adjusted by the mounting amount or the mounting strength of the brace constituting the support element, the vibration cycle of the horizontal element of the upper floor and the vibration of the lower floor after the completion of the building are completed. Even if there is a deviation from the vibration period, the vibration period of the horizontal element on the upper floor can be finely adjusted by increasing or decreasing the strength by attaching or detaching the brace or changing the attachment method.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a nuclear power-related building and a damping structure according to the present invention will be described below with reference to the accompanying drawings. It is to be noted that the same reference numerals are given to components and the like that are substantially the same as those in the conventional technology, and description thereof will be omitted.

FIG. 1 is a vertical sectional view of a control building as a nuclear-related building according to the present embodiment. As can be seen from the figure, the control building 11 according to the present embodiment includes a lower floor 12 made of reinforced concrete, and a top floor 13 made of steel on the lower floor.

On the top floor 13, a roof 14 is supported by a steel column 15 as a support element, and a rubber-based elasto-plastic damper 16, an oil damper 17, and an energy-absorbing steel brace 18 are installed between the columns. It is configured. The energy-absorbing steel frame brace 18 may be appropriately selected from a Y-shaped brace described in Japanese Patent Publication No. 50-32539 and a C-shaped brace described in Japanese Patent Publication No. 4-12790.

In the control building 11 of the present embodiment, the swing of the roof 14 is suppressed by the action of the various dampers 16 and 17 and the energy absorbing steel frame brace 18. Therefore, the response shear force of the top floor 13 during an earthquake is
Compared to the conventional control building 1, which is entirely reinforced concrete, the overturning moment at the lower end of the base slab 2 is reduced accordingly.

As described above, according to the control building 11 of the present embodiment, since the top floor 13 is constructed of a steel frame and the energy absorbing member is installed on the floor, the response shear force on the top floor is reduced, Correspondingly, the overturning moment at the lower end of the base plate is also reduced.

Therefore, for the same design seismic force, the overturning moment of the base slab is smaller than that of the conventional control building, and as a result, it is possible to meet the standard of the ground contact ratio with a smaller base slab. In other words, 50
The basic version, which required a size of about mx 50m, became 40
A base plate having a size of about mx 40 m can be used, so that the construction period can be shortened and the construction cost can be reduced, and a more rational plan can be achieved.

In the present embodiment, the lower floor is made of RC, but the present invention is not limited to such a structure, and may be made of SRC instead of RC.

In this embodiment, various types of dampers are combined as energy absorbing members.
The combination of these dampers is optional,
It goes without saying that the same type of damper may be used.

Next, the vibration control structure according to the present embodiment will be described.

FIG. 2 shows a building 21 as a vibration control structure. As can be seen from FIG.
The uppermost floor 22 as an upper floor is constructed of steel on a lower floor 23 composed of RC or the like.

The top floor 22 has a roof 24 as a horizontal element.
Is supported by a steel column 25, a steel brace 27, and an energy-absorbing steel brace 26 as supporting elements, and the weight of the roof 24 is an additional mass of a dynamic damper that suppresses vibration of the lower floor 23 by the roof. Thus, for example, it is set to about 1 to 10% of the total weight of the lower floor 23.

The steel columns 25, the steel braces 27, and the energy-absorbing steel braces 26, which are support elements for supporting the roof 24, act as springs of a dynamic damper that suppresses vibration of the lower floor 23. The horizontal rigidity is set so that

More specifically, the steel columns 25 are arranged such that the roof 24 vibrates at substantially the same cycle as the primary natural cycle of the lower floor 23.
The cross-section and the number of the steel braces 27 or the energy-absorbing braces 26 may be determined. However, the mounting amount and the mounting strength of the steel braces 27 are provisionally determined at the time of building construction. Then, the vibration characteristics of the top floor 22 are grasped, and the vibration period of the roof 24 is made to coincide with the vibration period of the lower floor 23 by appropriately attaching, removing, or increasing or decreasing the strength of the brace based on the result. Good to do.

The energy absorbing steel frame brace 26
About the energy absorption type steel frame brace 18 of FIG.
Similarly, the Y-shaped brace described in Japanese Patent Publication No. 50-32539,
What is necessary is just to select suitably from the C-shaped brace etc. of Japanese Patent Publication No. 4-12790.

In the vibration damping structure 21 of the present embodiment,
The roof 24 of the upper floor 22, which is an additional mass body, resonates with the lower floor 23 to suppress the vibration of the lower floor 23 by its inertia force. However, since the roof 24 is a member originally required as a structure, There is no need to separately install an additional mass body as in a normal dynamic damper. Also, the steel columns 25 and the steel braces 26 and 27 supporting the roof 24 are provided.
Is also a necessary member of the structure,
There is no need to separately install a spring for the additional mass body as in a normal dynamic damper.

As described above, the building 2 of the present embodiment
According to No. 1, the roof 24 necessary for the original structure and the pillars 25 and braces 26, 27 supporting the roof 24 are respectively provided on the lower floor 2
The dynamic damper, which suppresses the sway of 3, also serves as an additional mass body and a spring, so that the installation cost can be greatly reduced compared to the case where a separate vibration damping mechanism is installed separately as in the past, and dynamic The installation space required only for the damper is unnecessary, and the top floor can be effectively used for its intended use.

Further, according to the building 21 of the present embodiment, the upper floor 22 is made of a steel frame, and a part of the supporting element for supporting the roof 24 is constituted by the energy absorbing steel brace 26, so that the additional mass body of the dynamic damper is provided. Roof 24
Is absorbed by the energy-absorbing steel frame brace 26, but such a brace can also be used as a structural element originally required as a structure. Therefore, a damping mechanism of the additional mass body is separately provided as in a normal dynamic damper. No need to install.

Further, since the horizontal rigidity of the support element is finely adjusted by the mounting amount or the mounting strength of the steel brace 27 constituting the support element, the vibration cycle of the roof 24 of the upper floor 22 and the lower Even if there is a deviation from the vibration cycle of the floor 23, the vibration cycle of the roof 24 can be finely adjusted by increasing or decreasing the strength due to the attachment and detachment of the steel frame brace 27 or a change in the attachment method.

In the present embodiment, the upper floor is composed of only the uppermost floor. Alternatively, the upper floor may be composed of several floors including the uppermost floor. In such a case, for example, the floor slab on the top floor also acts as an additional mass of the dynamic damper.

In the present embodiment, the top floor is made of steel. However, the structure is not limited to this structure as long as it can function as a dynamic damper. May be.

In this embodiment, the dynamic damper is damped by the energy absorbing steel braces 26. Instead of such a member, a damper such as a rubber-based elastic-plastic damper or an oil damper may be used. .

In this embodiment, an example in which the present invention is applied to a general building is described. However, the vibration control structure of the present invention is not limited to such a structure, and is applicable to structures for any use. It is possible to

Next, an example in which the vibration control structure of the present invention is applied to a control building similar to that of FIG. 1 will be described. As shown in FIG.
The control building 31 of the present embodiment, like the control building 11 of FIG. 1, includes a lower floor 32 made of reinforced concrete, and a top floor 33 constructed of steel on the lower floor, and the top floor 33 is The roof 34 is supported by a steel column 35 which is a support element. The roof 34 is, for example, the entirety of the lower floor 32 such that the roof is an additional mass of a dynamic damper that suppresses vibration of the lower floor 32. It is set at about 1 to 10% of the weight.

The steel column 35, which is a support element for supporting the roof 34, together with the steel brace 39 and the energy absorbing steel brace 38 installed on the floor, functions as a spring of a dynamic damper that suppresses vibration of the lower floor 32. The horizontal rigidity is set.

Specifically, as in the building of FIG.
The cross section and the number of the steel columns 35, the steel braces 39, or the energy absorbing braces 38 may be determined so that the steel frames vibrate at substantially the same period as the primary natural period of the lower floor 32. The strength is tentatively determined at the time of building construction, and after completion of the building, for example, a vibration test is performed to grasp the vibration properties of the top floor 33, and based on the results, mounting, dismounting, or increasing or decreasing the strength of the brace is appropriately performed. By doing, roof 3
It is preferable to make the vibration cycle of the fourth floor coincide with the vibration cycle of the lower floor 32.

The energy absorbing steel frame brace 38
About the energy absorption type steel frame brace 18 of FIG.
Similarly, the Y-shaped brace described in Japanese Patent Publication No. 50-32539,
What is necessary is just to select suitably from the C-shaped brace etc. of Japanese Patent Publication No. 4-12790.

In the control building 31 of this embodiment, the roof 34 of the upper floor 33, which is an additional mass, resonates with the lower floor 32 as in the building 21 of FIG. But the roof 34 is
Since this member is essentially required as a control building, there is no need to separately install an additional mass body as in a normal dynamic damper. Further, since the steel column 35 and the steel brace 39 supporting the roof 34 are essentially necessary members, there is no need to separately install a spring of an additional mass body as in a normal dynamic damper.

As described above, according to the control building 31 of the present embodiment, the roof 34 of the top floor 33 and the steel columns 35 and the steel braces 39 and 38 supporting the roof 34 are dynamics for suppressing the swing of the lower floor 32. Since it acts as an additional mass body and a spring for the damper, the response shear force during an earthquake is significantly reduced over all floors as compared with the conventional control building 1 having no vibration damping mechanism. Moment is also greatly reduced.

Therefore, for the same design seismic force, the overturning moment of the base slab is smaller than that of the conventional control building, and as a result, it is possible to meet the standard of the ground contact ratio with a smaller base slab. In other words, 50
The basic version, which required a size of about mx 50m, became 40
A base plate having a size of about mx 40 m can be used, so that the construction period can be shortened and the construction cost can be reduced, and a more rational plan can be achieved.

In addition, the roof 34 necessary for the original control building
And the pillars 35 and braces 39 that support the same function as an additional mass body and a spring of the dynamic damper that suppresses the swing of the lower floor 32. Therefore, the installation cost is reduced as compared with a case where a vibration control mechanism is separately installed. It is possible to greatly reduce the size, and it is not necessary to provide an installation space necessary only for the dynamic damper, so that the top floor can be effectively used for its intended use.

Further, according to the control building 31 of the present embodiment, the upper floor 33 is made of a steel frame, and a part of the support element for supporting the roof 34 is made of the energy absorbing steel brace 38. The swing of the roof 34, which is the body, is absorbed by the energy-absorbing steel frame brace 38. Since such a brace is also a structural element originally required as a structure, a damping mechanism of the additional mass body is provided as in a normal dynamic damper. There is no need to install separately.

Further, since the horizontal rigidity of the support element is finely adjusted by the mounting amount or the mounting strength of the steel braces 39 constituting the support element, the vibration cycle of the roof 34 of the upper floor 33 and the lower Even if there is a deviation from the vibration cycle of the floor 32, the vibration cycle of the roof 34 can be finely adjusted by increasing or decreasing the strength due to the attachment and detachment of the steel frame brace 39 or the change in the attachment method.

In this embodiment, the dynamic damper is damped by the energy-absorbing steel braces 38. However, instead of such a member, a rubber-based elastic-plastic damper,
A damper such as an oil damper may be used.

[0051]

As described above, the nuclear-related building of the present invention is, as described in claim 1, constructed of a lower floor constructed of concrete structural elements and a steel frame on the lower floor. It consists of the top floor, and since the energy absorption member is installed on the top floor, the falling moment of the base slab is smaller than the conventional control building for the same design seismic force,
As a result, it is possible to clear the standard of the contact rate with a smaller basic version.

Further, in the vibration control structure of the present invention, as described in claim 2, horizontal elements such as a roof and a slab constituting an upper floor and supporting elements such as columns and braces for supporting the horizontal elements are respectively provided in a lower layer. Since the weight of the horizontal element and the horizontal rigidity of the support element are set so as to be an additional mass body and a spring of the dynamic damper that suppresses floor vibration, compared to a case where a vibration damping mechanism is separately installed as in the related art. The installation cost can be significantly reduced, and the upper floor can be effectively used for its intended use.

Further, in the vibration control structure of the present invention, the upper floor is made of a steel frame, and a part of the support element is made of an energy absorbing steel brace. There is no need to separately install a damping mechanism.

Further, in the vibration control structure of the present invention, the horizontal rigidity of the support element is finely adjusted by the mounting amount or the mounting strength of the brace constituting the support element. The vibration period of the horizontal element can be finely adjusted.

[0055]

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a control building as a nuclear-related building according to an embodiment.

FIG. 2 is a vertical sectional view of a building as a vibration control structure according to the embodiment.

FIG. 3 is a vertical sectional view of a control building as a vibration control structure according to the embodiment.

FIG. 4 is a sectional view of a control building according to the related art.

[Explanation of symbols]

Reference Signs List 11 Control building (nuclear-related building) 12 Lower floor 13 Top floor 16 Rubber elastic-plastic damper (energy absorbing member) 17 Oil damper (energy absorbing member) 18 Energy absorbing steel brace (energy absorbing member) 21 Building (vibration control structure) 22) Top floor (upper floor) 23 Lower floor 24 Roof (additional mass) 25 Steel column (spring) 26 Energy absorption type steel frame brace (spring) 27 Steel frame brace (spring) 31 Control building (vibration control structure) 32 Lower floor 33 Top floor (upper floor) 34 Roof (additional mass) 35 Steel column (spring) 38 Energy absorbing steel frame brace (spring) 39 Steel frame brace (spring)

Continued on front page (72) Inventor Mitsuru Kageyama 4-640 Shimoseito, Kiyose-shi, Tokyo Inside Obayashi Corporation Technical Research Institute

Claims (4)

[Claims] 1. An energy absorbing member is provided on a lower floor constructed of a concrete structural element and a top floor constructed of a steel frame on the lower floor. Nuclear-related buildings. 2. A horizontal element such as a roof or a slab constituting an upper floor and a supporting element such as a column or a brace supporting the horizontal element become an additional mass body and a spring of a dynamic damper for suppressing vibration of the lower floor. The weight of the horizontal element and the horizontal rigidity of the support element are set in the vibration control structure. 3. The vibration control structure according to claim 2, wherein the upper floor is made of a steel frame, and a part of the support element is made of an energy absorbing steel brace. 4. The vibration damping structure according to claim 2, wherein the horizontal rigidity of said support element is finely adjusted by an attachment amount or an attachment strength of a brace constituting said support element.