JP5280939B2 - building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the propagation of vibration from a facility to an overhung part. <P>SOLUTION: A ceiling member 26 is isolated from the overhung part 16 provided above the ceiling member 26. The vibration of the ceiling member 26 amplified through resonance with the vibration A is thereby prevented from being propagated to the overhung part 16. The propagation of the vibration from the facility 14 to the overhung part 16 is reduced thereby. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a building.

  When a building is equipped with a vibration source (for example, a concert hall, a sports gym, a dance studio, a machine room with a large crusher or rotary press, a factory, etc.), the vibration transmitted from the vibration source to the building It becomes a problem. In particular, if a vibration source and a room where vibration is to be suppressed (for example, a residence, a restaurant, a conference room, a laboratory that handles precision equipment, a clinic, a photography studio, etc.) exist, vibration is generated from the vibration source. Vibration transmitted to a room to be suppressed (hereinafter referred to as “vibration chamber”) is a big problem.

  As a countermeasure against the above problem, in Patent Document 1, two buildings are separated from each other, and vibrations transmitted from the vibration source to the vibration isolation room are reduced by providing the vibration source and the vibration isolation room in separate buildings. doing.

  However, if two buildings are provided side by side as in Patent Document 1, the building area increases, the use efficiency of the site decreases, and it cannot be adopted when the site is small. Furthermore, in patent document 1, the two buildings built side by side are connected with a damper. In this way, when two buildings are connected by a damper, vibration energy is absorbed by the damping effect of the damper, while vibration is propagated from the vibration generating chamber to the anti-vibration chamber by the spring stiffness of the damper.

  Further, in Patent Document 2, a vibration source (vibration generating unit) is provided on a frame made of a truss structure in the same building, and a vibration isolation room is provided on a floor (vibration insulating floor) constructed in the frame. Is provided. In this building, since the edge of the frame that supports the vibration source and the vibration insulating floor that supports the vibration isolation chamber is cut, vibration transmitted from the vibration source to the vibration isolation chamber is reduced.

  However, when a vibration source such as a heavy crusher or a wheel rolling machine is installed, the reinforcement of the frame increases and the cost increases. Further, if a vibration source such as a concert hall where many users come and go in a short time is provided above the vibration isolation room, the movement path of the user becomes long and convenience is lowered.

  On the other hand, although it does not reduce the vibration propagated from the vibration source to the building, in Patent Document 3, the two adjacent buildings are connected by a damper to reduce the vibration of the building due to human walking and equipment machinery. An anti-vibration structure is disclosed. In this anti-vibration structure, one building is provided with an extending portion that extends to the top of the other building, and the extending portion and the top of the other building are connected by a damper. By this damper, the vibration of the extended portion is reduced.

  However, since the vibration-proof structure of Patent Document 3 connects the two buildings with dampers as in the building of Patent Document 1 described above, vibration is propagated between the two buildings due to the spring rigidity of the dampers. .

JP 2007-255071 A JP 2001-336297 A JP 2008-57121 A

  In consideration of the above-described facts, the present invention aims to reduce vibration propagation from a facility room to an overhang portion.

Building according to claim 1, and the structure, and facilities chamber provided adjacent to said structure, together with the projecting upwardly of the facility chamber from said structure, a ceiling member of the facility chamber is the And an overhanging portion that is not connected except at the end of the ceiling member and has a cut edge.

According to said structure, the facility room and the overhang | projection part are provided. The projecting portion projects from the structure to the upper side of the facility room, and is not connected to the ceiling member of the facility room except at the end of the ceiling member, and is cut off. Therefore, the vibration of the ceiling member is not directly propagated to the overhanging portion. Therefore, the vibration of the overhang portion can be reduced. Further, since the solid propagation sound is not directly transmitted from the ceiling member to the overhanging portion, the noise in the overhanging portion is reduced.
The building according to claim 2 is provided with a structure, a facility room provided adjacent to the structure, integrated with the structure, and projecting upward from the structure to the facility room. A ceiling member of the facility room, and an overhang part with a cut edge.

The building according to claim 3 is the building according to claim 1 or 2 , wherein the projecting portion does not resonate with vibration generated from a vibration source existing in the facility room.

  According to said structure, since the overhang | projection part does not resonate with the vibration generate | occur | produced from the vibration source in a facility room, the vibration of an overhang | projection part is reduced.

The building according to claim 4 is the building according to claim 3 , wherein the natural frequency of the ceiling member is smaller than the natural frequency of the projecting portion, and the ceiling member generates vibration generated from the vibration source. Resonates with.

  According to said structure, since the vibration generate | occur | produced from the vibration source which exists in a facility room, and a ceiling member resonate, the shaking of a ceiling member is amplified. On the other hand, since the edge of the ceiling member and the overhang portion is cut, vibration is not directly transmitted from the ceiling member to the overhang portion. Therefore, the vibration of the overhang portion is reduced.

  Further, the natural frequency of the ceiling member is smaller than the natural frequency of the overhanging portion, that is, the natural frequency of the ceiling member and the natural frequency of the overhanging portion are different. Therefore, since the overhanging portion does not resonate with the vibration generated from the vibration source, the vibration of the overhanging portion is reduced.

The building according to claim 5 is the building according to claim 3 or claim 4 , wherein the overhanging portion has a truss structure.

  According to said structure, the overhang | projection part is equipped with the truss structure. By this truss structure, the natural vibration of the overhang portion can be increased by increasing the rigidity of the overhang portion. Therefore, the vibration generated from the vibration source existing in the facility room and the resonance with the overhanging portion can be avoided, and the vibration of the overhanging portion can be reduced.

The building according to claim 6 is the building according to any one of claims 3 to 5 , wherein the overhanging portion includes a steel earthquake-resistant wall.

  According to said structure, the overhang | projection part is equipped with the steel earthquake-resistant wall. By increasing the rigidity of the overhang portion by the steel earthquake resistant wall, the natural vibration of the overhang portion can be increased. Therefore, the vibration generated from the vibration source existing in the facility room and the resonance with the overhanging portion can be avoided, and the vibration of the overhanging portion can be reduced.

  Since this invention set it as said structure, the vibration propagation from a facility room to an overhang | projection part can be reduced.

It is the 2-2 sectional view taken on the line of FIG. 2 which shows the building which concerns on 1st Embodiment of this invention. It is a schematic plan view which shows the building which concerns on 1st Embodiment of this invention. It is the 2-2 sectional view taken on the line of FIG. 2 which shows the building which concerns on 1st Embodiment of this invention. (A) And (B) is the frequency characteristic of the response acceleration of the overhang | projection part in the conventional building, (C) is the frequency characteristic of the response acceleration of the overhang | projection part which concerns on 1st Embodiment of this invention. (A) is a curve showing the excitation force, (B) is a resonance curve of the overhanging part according to the first embodiment of the present invention, and (C) is a curve of the overhanging part according to the first embodiment of the present invention. It is a frequency characteristic of response acceleration. It is a figure equivalent to the 2-2 line section of Drawing 2 showing the building concerning a 2nd embodiment of the present invention. It is a top view which shows the building which concerns on the modification of 1st, 2nd embodiment of this invention. The steel shear wall which concerns on the modification of 1st, 2nd embodiment of this invention is shown, (A) is an elevation view, (B) is the 8-8 sectional view taken on the line of FIG. 8 (A). It is. The steel shear wall which concerns on the modification of 1st, 2nd embodiment of this invention is shown, (A) is an elevation, (B) is 9-9 line sectional drawing of FIG. 9 (A). It is. It is an elevational view showing a building as a comparative example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, the first embodiment will be described.

  As shown in FIGS. 1 and 2, the steel structure building 10 includes a structure 12, a facility room 14, and an overhang portion 16. The structure 12 has a ramen structure composed of columns 18 and beams 20, and includes a lower structure portion 12A supported by a foundation 22 and an upper structure portion 12B constructed on the lower structure portion 12A (FIG. 2). For example).

  The facility room 14 is constructed adjacent to the lower structure portion 12A, and is integrated with the lower structure portion 12A. The facility room 14 is a large space partitioned by a wall 24, and is used as a concert hall, a gym, a dance studio, a machine room where a large crusher, a rotary press, etc. are installed, and a factory. A vibration source that generates vibration A having a relatively large excitation force in the frequency band (2 to 4 Hz in the present embodiment) is provided. In the present embodiment, those that generate vibration A are referred to as vibration sources, and those that generate vibration A artificially, such as concert halls and sports gyms, are also included in the vibration sources. In vibration A, a frequency band in which the excitation force is relatively large is referred to as a dominant frequency band.

  The ceiling member 26 of the facility room 14 is made of a horizontal member such as a ceiling surface material or a beam supporting the ceiling surface material laid between the pillar 18 of the lower structural portion 12A and the wall 24 of the facility room 14, and has a large span (main In the embodiment, it is about 20 m). Such a long span horizontal member generally tends to have a lower natural frequency, and the natural frequency of the ceiling member 26 of the present embodiment is 2 to 4 Hz. That is, the ceiling member 26 resonates with the vibration A in the dominant frequency band. The ceiling member 26 may be an integrated ceiling surface material and a beam supporting the ceiling member.

  An overhang portion 16 is provided above the facility room 14. The overhanging portion 16 protrudes from the upper structure portion 12B to the upper side of the facility room 14, and is supported by the upper structure portion 12B in a cantilever manner. A gap is provided between the overhang portion 16 and the ceiling member 26 of the facility room 14, that is, the edge between the overhang portion 16 and the ceiling member 26 is cut. Thereby, the vibration of the ceiling member 26 is not directly propagated to the overhanging portion 16. The overhanging portion 16 has a highly rigid truss structure in which steel columns 16A, beams 16B, and diagonal members 16C are connected, and has a natural frequency of about 5 to 10 Hz. That is, the natural frequency of the overhanging portion 16 is out of the dominant frequency band of the vibration A, and does not resonate with the vibration A in the dominant frequency band.

  Next, the operation of the first embodiment will be described.

  As shown in FIG. 3, when the vibration A is generated in the facility room 14, the vibration A is propagated to the ceiling member 26 and is propagated to the lower structure portion 12 </ b> A via the foundation 22. Here, since the ceiling member 26 has a large span, its natural frequency (2 to 4 Hz in this embodiment) is small. Therefore, the ceiling member 26 resonates with the vibration A in the dominant frequency band, and the amplitude thereof is amplified.

  On the other hand, since the edge of the ceiling member 26 and the overhanging portion 16 provided above the ceiling member 26 is cut off, the vibration of the ceiling member 26 amplified by resonance is not directly propagated to the overhanging portion 16. Thereby, the vibration propagation from the facility room 14 to the overhang part 16 is reduced. Therefore, the vibration performance of the overhanging portion 16 can be improved while using the space above the facility room 14. Further, since the solid propagation sound is not directly propagated from the ceiling member 26 to the overhanging portion 16, the noise of the overhanging portion 16 is reduced.

  In addition, the vibration A is propagated to the overhanging portion 16 through the foundation 22 and the structure 12, but the overhanging portion 16 has a highly rigid truss structure, and its natural frequency (in this embodiment, 5 to 5). 10 Hz) is increased. Therefore, the overhanging portion 16 does not resonate with the vibration A in the dominant frequency band. Therefore, the vibration of the overhang portion 16 is reduced, and the vibration performance of the overhang portion can be improved.

  In this way, the building 10 in which the vibration of the overhanging portion 16 is reduced includes a facility room 14 serving as a vibration source, a vibration isolation room (for example, a residence, a restaurant, a conference room, a laboratory that handles precision equipment, a clinic, This is particularly effective when coexisting with a photography studio. Specifically, by providing an anti-vibration room in the overhanging portion 16, for example, a concert hall and a restaurant can coexist in the same building 10.

  In the present embodiment, since the overhanging portion 16 is provided above the facility room 14, the facility room 14 is closer to the ground surface than the overhanging portion 16. Therefore, for example, when installing a vibration source such as a heavy crusher or a wheel rolling machine in the facility room 14, installation work of these vibration sources becomes easy. In addition, when the facility room 14 is used as a concert hall or the like where a large number of users come and go in a short time, the user's travel route is shortened and convenience is improved.

  Next, the operation of this embodiment will be further described in comparison with a comparative example.

  FIG. 10 shows a building 100 as a comparative example. 4 (A) and 4 (B) schematically show frequency characteristics 112 and 114 of the response acceleration of the overhanging portion 106 and the structure 102 of the building 100, and FIG. 4 (C). 1 schematically shows frequency characteristics 28 and 30 of response accelerations of the overhang portion 16 and the structure 12 according to the present embodiment. In addition, the code | symbol 32 in FIG. 4 (A)-FIG. 4 (C) represents the excitation force of the vibration A typically.

  As shown in FIG. 10, the building 100 includes a structure body 102, a facility room 104, and an overhang portion 106. Here, the overhanging portion 106 of the building 100 is not a truss structure. Therefore, the rigidity of the overhang portion 106 is smaller than that of the overhang portion 16 according to the present embodiment, and its natural vibration is 2 to 4 Hz. Therefore, as shown in FIG. 4A, the overhanging portion 106 resonates with the vibration A in the dominant frequency band. Further, in the building 100, the edge between the ceiling member 108 and the overhanging portion 106 of the facility room 104 is not cut. Therefore, the vibration of the ceiling member 108 amplified by the resonance with the vibration A is directly propagated to the overhang portion 106. Therefore, the vibration (response acceleration) of the overhanging portion 106 is increased in the dominant frequency band.

  Next, the frequency characteristic 112 of the response acceleration of the overhanging portion 106 when the overhanging portion 106 has a truss structure and the rigidity of the overhanging portion 106 is the same as that of the overhanging portion 16 according to the present embodiment is shown in FIG. Shown in In this case, since the overhang portion 106 does not resonate with the vibration A in the dominant frequency band, the vibration (response acceleration) of the overhang portion 106 is reduced as compared to FIG. However, since the vibration of the ceiling member 108 amplified by the resonance with the vibration A is directly propagated to the overhanging portion 106, the vibration (response acceleration) of the overhanging portion 106 is large.

  On the other hand, in the present embodiment, since the edge between the ceiling member 26 and the overhang portion 16 is cut, the vibration of the ceiling member 26 is not directly propagated to the overhang portion 16. Moreover, since the natural frequency (5 to 10 Hz) of the overhang portion 16 is large, the overhang portion 16 does not resonate with the vibration A in the dominant frequency band. Accordingly, as can be seen from the response acceleration frequency characteristic 28 shown in FIG. 4C, the vibration of the overhanging portion 16 in the dominant frequency band is reduced.

  The vibration A is propagated to the structure 12 through the foundation 22, but the structure 12 has high rigidity, that is, has a large natural frequency, and therefore does not resonate with the vibration A in the dominant frequency band. Therefore, in the dominant frequency band, the vibration (response acceleration) of the structure 12 is not amplified. On the other hand, in the high frequency band where the structure 12 resonates with the vibration A, the vibration (amplitude) of the structure 102 is amplified by resonance. The same applies to the structure 102 of the comparative example.

  Next, the natural frequency of the overhang portion 16 will be described.

  5A schematically shows an excitation force curve 34 of the vibration A, and FIG. 5B shows resonance curves 36A, 36B, and 36C of the three overhang portions 16 having different natural frequencies. Is schematically shown, and FIG. 5C shows the frequency characteristics 38A, 38B, and 38C of the response acceleration of each overhang portion 16.

  As described above, the vibration of the overhanging portion 16 can be efficiently reduced by avoiding the resonance between the vibration A and the overhanging portion 16 in the dominant frequency band where the excitation force is large. Therefore, it is preferable to design the natural frequency of the overhang portion 16 so that the vibration A and the overhang portion 16 do not resonate. Further, the natural frequency of the overhang portion 16 is appropriately designed so as to satisfy the target performance corresponding to the use of the overhang portion 16. For example, when the target performance of the overhanging portion 16 is the performance evaluation level V-30 related to vertical vibration in the residential performance evaluation guidelines (Environmental Standards of Architectural Institute of Japan), as shown in FIG. Only the largest overhang portion 16 (frequency characteristic 38C of response acceleration) satisfies the performance evaluation level V-30.

  Next, a second embodiment will be described. In addition, the thing of the same structure as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits suitably and demonstrates.

  FIG. 6 shows a building 40 according to the second embodiment. In this building 40, a projecting portion 42 that projects upward from the facility room 14 is supported by the facility room 14. Specifically, the overhanging portion 42 has a high-rigidity truss structure in which steel columns 42A, beams 42B, and diagonal members 42C are connected, and overhangs the facility room 14 from the upper structure portion 12B. A column 44 is provided as a support portion on the free end side (tip side) of the overhanging portion 42, and this column 44 is supported by the wall 24 that partitions the facility room 14. That is, the pillar 44 of the overhanging portion 42 is supported on the node between the ceiling member 26 and the wall 24 that supports the ceiling member 26. Thereby, the vibration propagated from the ceiling member 26 to the overhanging portion 42 via the column 44 is reduced.

  On the other hand, a gap is provided between the overhang portion 42 and the ceiling member 26 of the facility room 14, that is, the edge between the overhang portion 16 and the ceiling member 26 is cut. Thereby, the vibration of the ceiling member 26 is not directly propagated to the overhanging portion 16.

  Next, the operation of the second embodiment will be described.

  By supporting the overhanging portion 42 in the facility room 14, it is possible to increase the overhang amount (projection amount) of the overhanging portion 42 and widen the space of the overhanging portion 42 while reducing the burden on the structure 12.

  Further, by supporting the column 44 of the overhanging portion 42 on the node between the ceiling member 26 and the wall 24, vibration propagated from the column 18 to the overhanging portion can be reduced. This is because the vibration (amplitude) of the ceiling member 26 decreases from the center portion to the end portion of the ceiling member 26 and becomes minimum at a node that is a joint portion between the other structural member and the ceiling member 26.

  In this embodiment, the column 44 of the overhang portion 42 is supported on the node between the ceiling member 26 and the wall 24, but the column 44 of the overhang portion 42 may be supported on the end side of the ceiling member 26. . Further, the support portion is not limited to the pillar 44 but may be a wall of the overhang portion 42.

  In addition, the first and second embodiments can be applied to projecting portions of various shapes (circular, elliptical, polygonal in plan view) and structures. For example, as shown in FIG. 7A, the overhanging portion 46 may overhang from the corner portion of the lower structure portion 12 </ b> A toward the center portion of the facility room 14. Further, as shown in FIG. 7B, the overhang portion 48 may be elliptical in plan view. Further, as shown in FIG. 7C, the overhang portion 50 is elliptical in plan view, and may protrude from the corner portion of the lower structure portion 12 </ b> A toward the center portion of the facility room 14. .

  Moreover, you may raise the rigidity of the overhang | projection parts 16 and 42 by replacing with a truss structure or combining with a truss structure and installing a steel earthquake-resistant wall. For example, as shown in FIGS. 8A and 8B, a steel seismic wall 60 is installed on the frame 62 constituting the overhanging portion 16. The steel seismic wall 60 includes a plurality of structural steel members 64 provided on the frame 62 and joining means for joining the structural steel members 64 adjacent in the vertical direction.

  The frame 62 is configured by joining a column 16A made of a square steel pipe and a beam 16B made of an H-shaped steel. Each section member 64 is formed in a C-shaped cross section. These structural steel members 64 are arranged adjacent to each other in the vertical direction, and are joined so as to transmit shearing force by joining means such as high-strength bolts 66 and nuts 68 that penetrate through the adjacent flange portions. In addition, steel shaped plate 70 is applied to the structural steel member 64 adjacent in the horizontal direction from the back side, and each shaped steel member 64 and the attached plate 70 are joined by a high strength bolt 72 and a nut 73. ing. The shape steel member 64 is not limited to the C-shaped section, but may be a H-shaped section, an I-shaped section, a rectangular section, or the like.

  On the other hand, a steel mounting member 74 having an L-shaped cross section is fixed to the column 18. The attachment member 74 and the web portion of the shaped steel member 64 are joined by a high-strength bolt 72. In addition, as a material of the shape steel member 64, normal steel (for example, SM490, SS400, etc.), low yield point steel (for example, LY225, etc.), etc. are used.

  The steel seismic wall 60 increases the rigidity of the overhanging portion 16 and improves the seismic performance of the overhanging portion 16. That is, when an interlayer deformation angle is generated in the frame 62 due to an earthquake or the like, a horizontal force is transmitted from the upper and lower beams 20 to each shape steel member 64, and each shape steel member 64 undergoes shear deformation. Thereby, each shape-steel member 64 resists a horizontal force, and exhibits an earthquake resistance effect. Moreover, by designing so that the steel plate 102 yields with respect to a horizontal force, vibration energy is absorbed by the hysteresis energy of a steel plate, and the damping effect is exhibited.

  Further, as shown in FIGS. 9A and 9B, a steel earthquake resistant wall 80 using a corrugated steel plate 82 may be provided on the frame 62. Specifically, the steel earthquake-resistant wall 80 includes a corrugated steel plate 82 provided on the frame 62 and a frame body 84 provided on the outer periphery of the corrugated steel plate 82. The corrugated steel plate 82 is configured by bending a steel plate into a corrugated shape, and is disposed on the surface of the frame 62 with the crease 82A being vertical (the direction of the crease is in the vertical direction). As the material of the corrugated steel plate 82, ordinary steel (for example, SM490, SS400, etc.), low yield point steel (for example, LY225, etc.) or the like is used.

  The frame body 84 provided on the outer periphery of the corrugated steel plate 82 includes a vertical flange 84A provided at the left and right ends of the corrugated steel plate 82, and a horizontal flange 84B provided at the upper and lower ends of the corrugated steel plate 82. Has been. The vertical flange 84A and the horizontal flange 84B are made of steel plates, and are fixed along the end of the corrugated steel plate 82 by welding or the like. The horizontal flange 84 </ b> B and the upper and lower beams 20 are joined by a high-strength bolt 86 and a nut 88 so that a shearing force can be transmitted.

  The steel seismic wall 80 increases the rigidity of the overhanging portion 16 and improves the seismic performance. That is, when an interlayer deformation angle is generated in the frame 62 due to an earthquake or the like, a horizontal force is transmitted from the upper and lower beams 20 to the corrugated steel plate 82, and each section steel member 64 undergoes shear deformation. Thereby, each shape-steel member 64 resists a horizontal force, and exhibits an earthquake resistance effect. Moreover, by designing so that the steel plate 102 yields with respect to a horizontal force, vibration energy is absorbed by the hysteresis energy of a steel plate, and the damping effect is exhibited.

  Here, the corrugated steel plate 82 has an accordion effect that the rigidity in the direction orthogonal to the folding line 82A is weak, and has excellent deformation performance as compared with a general steel plate earthquake resistant wall. Therefore, the corrugated steel plate 82 has a greater shear buckling strength than a general steel plate earthquake resistant wall, and is excellent in durability and energy absorption performance. The corrugated steel plate 82 may be appropriately provided with stiffening ribs for preventing shear buckling.

  Further, by arranging the crease 82A of the corrugated steel plate 82 vertically, the rigidity of the overhanging portion 16 in the vertical direction (vertical direction) is increased. Thereby, as compared with the case where the crease 82A of the corrugated steel plate 82 is disposed sideways (the direction of the crease is horizontal), vertical vibration (vertical vibration) can be reduced. The corrugated steel plate 82 may be arranged with its crease 82A sideways.

  Moreover, you may arrange | position with a clearance gap between the corrugated steel plate 82 and the pillar 16A. Thereby, opening, such as equipment opening, can be provided in the steel earthquake-resistant wall 80 with a simple configuration. Furthermore, the cross-sectional shape (plate thickness, corrugated pitch, wave height, etc.) of the corrugated steel plate 82 is not limited to the shape shown in FIG. 9B, and can be changed as appropriate according to the seismic performance required for the steel seismic wall 80. .

The natural frequency (2 to 4 Hz) of the ceiling member 26 and the natural frequency (5 to 10 Hz) of the overhang portions 16 and 42 shown in the first and second embodiments are merely examples, and the present invention. It is not intended to limit the configuration. The resonance in the present embodiment means that the vibration (response magnification) of a member (for example, the ceiling member 26) excited by the vibration A is remarkably increased. Further, in this embodiment, there is one dominant frequency band (2 to 4 Hz) in which the excitation force is relatively large. However, when there are a plurality of dominant frequency bands, any of the dominant frequency bands In this case, the member to be vibrated only needs to resonate.
On the other hand, the term “no resonance” in the present embodiment means that the natural frequency of the member (eg, the overhang portions 16 and 42) excited by the vibration A is out of the dominant frequency band of the vibration A, and the amplitude is remarkably large. It is not amplified.

  Further, the truss structure for stiffening the overhang portions 16 and 42 is not limited to that described above, and can be changed as appropriate. Further, the truss structure may be applied to a part of the overhang portions 16 and 42 or may be applied to all of them. The same applies to the steel shear walls 60 and 80.

  The first and second embodiments can be applied to buildings having various structures such as a steel structure, a reinforced concrete structure, a steel reinforced concrete structure, and a prestressed concrete structure. Furthermore, the facility room 14 can be provided not only in the lower layer of the buildings 10 and 40 but also in the middle layer or the basement of the buildings 10 and 40.

  The first and second embodiments of the present invention have been described above. However, the present invention is not limited to such embodiments, and the first and second embodiments may be used in combination. Needless to say, the present invention can be implemented in various forms without departing from the scope of the invention.

DESCRIPTION OF SYMBOLS 10 Building 12 Structure 14 Facility room 16 Overhang part 26 Ceiling member 40 Building 42 Overhang part 46 Overhang part 48 Overhang part 50 Overhang part 60 Steel earthquake-resistant wall 80 Steel earthquake-resistant wall A Vibration

Claims (6)

A structure,
A facility room provided adjacent to the structure;
With protruding upward of the facility chamber from said structure, a ceiling member of the facility chamber and overhangs the edge not connected is turned off except in the ends of the ceiling member,
Building with. A structure,
A facility room provided adjacent to the structure and integrated with the structure;
Overhanging the structure room from above the facility room, and the overhang part with the edge of the ceiling of the facility room cut,
Building with. The building according to claim 1 or 2, wherein the projecting portion does not resonate with vibration generated from a vibration source existing in the facility room. The natural frequency of the ceiling member is smaller than the natural frequency of the overhanging portion,
The building according to claim 3, wherein the ceiling member resonates with vibration generated from the vibration source. The building according to claim 3 or 4, wherein the projecting portion includes a truss structure. The building according to any one of claims 3 to 5, wherein the overhang portion includes a steel earthquake resistant wall.

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