JP2014156889A - Seismic isolation structure for construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seismic isolation structure for a construction which attenuates vibration in two horizontal directions due to an earthquake.SOLUTION: A seismic isolation structure for a construction comprises: an extension member 1b horizontally extended from a side wall 1a of a construction 1; a steel support column (support column) 2 which receives a load due to vibration of the construction 1; and an attenuation connection mechanism 3 which connects the extension members 1b and the steel support column 2 and transfers the vibration from the construction 1 to the steel support column 2 by attenuating the same. When the load is generated on the construction 1 due to horizontal vibration, the attenuation connection mechanism 3 attenuates the vibration, while transferring the load from the construction 1 to the steel support column 2, in a manner that absorbs energy through: generation of torsional deformation on a torsion member 5 by allowing a V-shape between a first arm member 6 and a second arm member 7 to be expanded or narrowed; and the generation of plastic deformation after the torsional deformation exceeds an elastic range of the torsion member 5.

Description

  The present invention relates to a seismic isolation structure for a structure.

  Conventionally, various types of seismic isolation devices have been proposed in order to reduce damage to structures caused by earthquakes. For example, as a boiler used in a thermal power plant, a suspended boiler that is supported by being suspended from a support frame is often used in order to release the thermal expansion of a furnace wall of a boiler main body constituted by a water pipe. In such a suspended boiler that suspends and supports a heavy-weight boiler main body, the boiler main body and the support frame move differently when an earthquake occurs, and therefore, an anti-vibration measure against relative vibration is required.

  For this reason, in the prior art, the displacement caused by the thermal expansion of the boiler body is allowed without being constrained, the displacement caused by the shaking at the time of the earthquake is converged, and the anti-sway device part is plastically deformed for a large earthquake. Measures are taken to absorb the seismic energy and reduce the influence of the support frame on the support steel column.

  For example, Patent Document 1 discloses a technology for a seismic isolation structure for a suspended boiler. In the earthquake-proof structure according to Patent Document 1, an elastic-plastic brace is placed symmetrically between a connecting member that surrounds a steel column and a stopper member that protrudes from the boiler body when supporting the load caused by the earthquake of the boiler body with a steel column. However, the transmission of the load transmitted from the boiler body to the steel column via the stopper member by the elastoplastic brace arranged in line symmetry is performed simultaneously by pulling one elastoplastic brace and compressing the other elastoplastic brace. I have to.

JP 2012-13157 A

  However, the anti-seismic structure according to the prior art can absorb the load caused by the shaking in the direction along the longitudinal direction of the elastoplastic brace (direction along the furnace wall), while orthogonal to the longitudinal direction of the elastoplastic brace. In the horizontal direction (the direction in which the furnace wall moves away from or approaches the steel column), the load could not be absorbed effectively. That is, the earthquake-proof structure according to the prior art can only cope with a horizontal unidirectional vibration caused by the earthquake.

  In other words, if there is a large sway in the horizontal direction perpendicular to the longitudinal direction of the elastoplastic brace due to an earthquake, the end portion has a fixed or sliding structure, so that shear stress due to frictional force or fixing force is elastic. It occurred in the plastic brace, and there was a possibility that the elastic-plastic brace could not exhibit the predetermined performance.

  Then, an object of this invention is to provide the earthquake-proof structure of the structure which attenuate | damped the vibration of the horizontal 2 direction by an earthquake.

  The present invention provides a projecting member that projects horizontally from a side wall of a structure, a support column that receives a load caused by shaking of the structure, and connects the projecting member and the support column. The present invention relates to an anti-seismic structure for a structure including a damping coupling mechanism that attenuates and transmits a swing to the support column. The damping connection mechanism includes a torsion member capable of torsional deformation, a first arm member having one end fixed to the torsion member and the other end rotatably connected to the support column, and one end A second arm member fixed to the torsion member and having the other end rotatably connected to the overhanging member. The first arm member and the second arm member are configured to be V-shaped when viewed from the axial direction of the torsion member. And when horizontal shaking occurs in the structure, the V-shape formed by the first arm member and the second arm member narrows or widens when a load from the structure is transmitted to the support column. According to the present invention, the torsional member generates a torsional deformation, and when the torsional member exceeds an elastic region, plastic deformation is generated to absorb energy and attenuate the vibration.

  In the seismic isolation structure of the structure, two of the projecting members are disposed on the side wall so as to sandwich the supporting steel column, and both sides of the supporting steel column are connected to the projecting member by the damping coupling mechanism. It is preferred that

  In the earthquake-proof structure of the structure, the damping connection mechanism is fixed to the support pillar and fixed to the projecting member, and a first support base on which the other end of the first arm member is disposed, A second support base on which the other end of the second arm member is disposed, and the first arm member can be rotated at least in a horizontal direction with respect to the first support base fixed to the support column. And a connecting member that connects the second arm member so as to be rotatable at least in the horizontal direction with respect to the second support base fixed to the projecting member. Can be configured.

  In the earthquake-proof structure of the structure, the connecting member preferably connects the other end of the arm member and the support base with a pin structure or a universal joint structure.

  In the earthquake-proof structure of the structure, it is preferable that the structure is a boiler body, and the side wall is a furnace wall.

  According to the earthquake-proof structure of the structure of the present invention, it is possible to attenuate the vibration in two horizontal directions due to the earthquake.

It is a top view which shows the earthquake-proof structure of the structure of this invention. It is a perspective view which shows the attenuation | damping connection mechanism of this invention. (A) is a top view which shows the state in which the structure was shaken to the Y-axis direction by the earthquake, (B) is a top view which shows the state in which the structure was shaken to the X-axis direction by the earthquake.

  An embodiment of a seismic isolation structure for a structure according to the present invention will be described in detail with reference to FIGS. As shown in FIG. 1, the earthquake-proof structure of the structure includes a projecting member 1 b that projects horizontally from the side wall 1 a of the structure 1, and a support steel column (support column) 2 that receives a load caused by the vibration generated in the structure 1. And a damping coupling mechanism 3 that couples the overhang member 1b and the support steel column 2 to attenuate and transmit the vibration from the structure 1 to the support column 2.

  The structure 1 has a side wall 1a. From the side wall 1a, a square-shaped projecting member 1b projecting in the horizontal direction so as to be orthogonal to the side wall 1a is disposed. The overhang member 1b is disposed with a predetermined distance from the support steel column 2. The structure 1 is, for example, a boiler body used in a thermal power plant. The boiler body (structure) 1 has a furnace wall (side wall) 1a formed of a water pipe.

  The support steel column (support column) 2 is configured to support and receive a load caused by the shaking of the structure 1. The support steel column (support column) 2 is erected perpendicularly to the horizontal plane so as to be substantially orthogonal to the overhanging member 1b when the structure 1 is viewed from the side (viewed from the vertical direction in FIG. 1). The A plurality of support steel columns 2 are arranged around the structure 1 and constitute a support frame that supports the boiler body by suspending it. Here, for convenience, only the support steel column 2 at the center (center) on one side of the side support frame that surrounds the four circumferences of the boiler body (structure) 1 is shown. For example, the boiler body 1 expands and contracts in the front-rear and left-right directions on a horizontal plane due to a change in temperature. The boiler main body 1 is supported so as to expand and contract with a support steel column 2 at the center as a starting point. The supporting steel column 2 is a backstay that is, for example, an H-shaped steel.

  The damping connection mechanism 3 connects the support steel column 2 and the overhang member 1b. And the damping connection mechanism 3 attenuate | damps the vibration of the structure 1 to the support steel column 2, and transmits. As shown in FIG. 2, the damping connection mechanism 3 includes a torsion member 5, a first arm member 6, a second arm member 7, connection members 8 and 8, and first and second support bases 10. , 11.

  The torsion member 5 is capable of torsional deformation, and plastic deformation occurs when the torsional deformation occurs beyond the elastic range. The torsion member 5 has action portions 5a and 5b into which a load is input on one side and the other side in the axial direction. One end portion 6 a of the first arm member 6 is fixed to one action portion 5 a in the axial direction of the torsion member 5. Further, one end portion 7 a of the second arm member 7 is fixed to the other action portion 5 b in the axial direction of the torsion member 5.

  The first arm member 6 and the second arm member 7 are connected in a direction in which the longitudinal direction is orthogonal to the axis of the torsion member 5. The first arm member 6 and the second arm member 7 have one end portions 6a and 7a fixed to the torsion member 5 so as to be V-shaped when the torsion member 5 is viewed from the axial direction. The first arm member 6 has one end portion 6 a fixed to one action portion 5 a in the axial direction of the torsion member 5, and the other end portion 6 b connected to the mounting first support base 10 via the connecting member 8. . The second arm member 7 has one end portion 7 a fixed to the other action portion 5 b in the axial direction of the torsion member 5 and the other end portion 7 b connected to the second support base 11 via the connecting member 8.

  Here, the first arm member 6 is rotated in the circumferential direction with the axis of the torsion member 5 as the rotation axis, and the second arm member 7 is rotated with the axis of the torsion member 5 as the rotation axis. Rotate in the opposite direction. That is, the V-shape formed by the first arm member 6 and the second arm member 7 is narrowed or widened so that the other end portion 6b of the first arm member 6 and the other end portion 7b of the second arm member 7 Try to keep the distance closer or away. As a result, twist is imparted to the twist member 5.

  The connecting member 8 connects the other end 6b of the first arm member 6 to the first support base 10 so as to be rotatable at least in the horizontal direction. The connecting member 8 is a member that connects the other end 7 b of the second arm member 7 to the second support base 11 so as to be rotatable at least in the horizontal direction. The connecting member 8 can employ, for example, a pin by pin bonding.

  The first support base 10 is connected to the other end 6b of the first arm member 6 by a connecting member 8 so as to be rotatable at least in the horizontal direction. The second support base 11 is connected to the other end 7b of the second arm member 7 so as to be rotatable at least in the horizontal direction by a connecting member 8.

  With reference to FIG.1 and FIG.2, attachment and arrangement | positioning of the structure 1 demonstrated above, the side wall 1a, the support steel pillar 2, and the attenuation | damping connection mechanism 3 and 3 are demonstrated. Two overhanging members 1b are provided to protrude at the same height of the side wall 1a so as to sandwich the supporting steel column 2 therebetween. On one side of the two projecting members 1b and on both sides of the support steel column 2, the second support base 11, the first support base 10, the second support base 11, and the first support base 10 are the same virtual straight line. It is arranged to be located on the top. The first support pedestals 10 and 10 are fixed to the support steel column 2 and the second support pedestals 11 and 11 are fixed to the projecting member 1b, so that the damping connection mechanism 3 and the support steel column 2 are stretched. It is fixed between the protruding members 1b. Moreover, when the seismic structure of the structure 1 of the present invention is viewed in plan, the damping coupling mechanisms 3 and 3 are both V-shaped convex toward the side wall 1a of the structure 1 (the torsion member 5 is arranged on the left side of FIG. 1). ).

(Operation of the present invention)
The operation of the present invention will be described with reference to FIG. 3A is a plan view showing a state in which the structure 1 is shaken in the Y-axis direction due to the earthquake, and FIG. 3B is a plan view showing a state in which the structure 1 is shaken in the X-axis direction due to the earthquake. It is.

  Assume that the structure 1 is shaken in the Y-axis direction by an earthquake as indicated by an arrow in FIG. Then, the V-shape formed by the first arm member 6 and the second arm member 7 of the damping coupling mechanism 3 on the back side in the Y-axis direction (upper side in FIG. 3A) is widened and the front side in the Y-axis direction (see FIG. 3 (A)), the V-shape formed by the first arm member 6 and the second arm member 7 of the damping coupling mechanism 3 is narrowed, so that torsional deformation is generated in each of the torsion members 5 and 5. . The torsion members 5 and 5 are elastically deformed until a predetermined torsional deformation, and are plastically deformed when exceeding the elastic region, and the vibration from the structure 1 is attenuated and transmitted to the supporting steel column 2.

  Further, when the structure 1 is shaken in the −Y-axis direction by an earthquake, the first arm member 6 and the second arm member of the damping coupling mechanism 3 on the back side in the Y-axis direction (the upper side in FIG. 3A). 7 and the V-shape formed by the first arm member 6 and the second arm member 7 of the damping coupling mechanism 3 on the front side in the Y-axis direction (the lower side in FIG. 3A) are widened. Thus, torsional deformation is generated in the torsion members 5 and 5, and the shaking due to the earthquake is attenuated and transmitted to the supporting steel column 2.

  Assume that the structure 1 is shaken in the X-axis direction by an earthquake as shown by the arrow in FIG. Then, the damping connection mechanism 3 on the back side in the Y-axis direction (upper side in FIG. 3A) and the first arm member 6 of the damping connection mechanism 3 on the front side in the Y-axis direction (lower side in FIG. 3A) The V-shape formed by the second arm member 7 spreads, and the torsional members 5 and 5 are torsionally deformed to attenuate the vibration caused by the earthquake and transmit them to the supporting steel column 2.

  When the structure 1 is shaken in the −X-axis direction by an earthquake, the damping coupling mechanism 3 on the back side in the Y-axis direction (upper side in FIG. 3A) and the front side in the Y-axis direction (FIG. 3A). The V-shape formed by the first arm member 6 and the second arm member 7 of the attenuation coupling mechanism 3 in the middle and lower sides is narrowed, causing torsional deformation in each of the torsion members 5 and 5, resulting from an earthquake. The vibration is attenuated and transmitted to the supporting steel column 2.

  As described above, according to the damping coupling mechanism 3 of the structure 1 according to the present invention, it is possible to attenuate the vibration in the two horizontal directions due to the earthquake in the Y-axis direction and the X-axis direction. In addition, since the damping coupling mechanism 3 is disposed on both sides of the support steel column 2, it is possible to equally dampen the shaking caused by the earthquake generated in the structure 1. Further, the damping coupling mechanism 3 of the structure 1 according to the present invention is such that the damping coupling mechanism 3 has a convex V shape toward the side wall 1a side of the structure 1 (the torsion member 5 is disposed on the left side in FIG. 1). Since it is disposed, it is possible to attenuate the vibration in the two horizontal directions without taking a useless space.

  Here, in the seismic isolation structure of the structure 1 of the present invention, two protruding members 1b are provided on the side wall 1a so as to sandwich the supporting steel column 2 with a predetermined interval, and the damping coupling mechanisms 3 and 3 are supported. Although it demonstrated by the structure which is arrange | positioned at the both sides of the steel column 2, and connected the support steel column 2 and the overhang | projection member 1b, it is not limited to this. For example, the extension member 1b is one, and the damping coupling mechanism 3 is arranged on one side of the support steel column 2 with a predetermined interval so that the support steel column 2 and the extension member 1b are connected to each other, so The structure which attenuates may be sufficient.

  Moreover, although the connection member 8 was demonstrated with the pin structure, it is not limited to this. For example, the connecting member 8 has the other end portions 6b and 7b of the first arm member 6 and the second arm member 7 in the horizontal direction and the vertical direction with respect to the first support base 10 and the second support base 11. A universal joint structure that is pivotably connected may be used. When the universal joint structure is adopted, not only horizontal two directions but also vertical vibration due to earthquake can be attenuated. Therefore, not only the rolling but also the shaking caused by the vertical earthquake can be attenuated.

  Further, when the seismic structure of the structure 1 of the present invention is viewed in plan, the damping coupling mechanism 3 has a V-shape projecting toward the side wall 1a of the structure 1 (the torsion member 5 is disposed on the left side in FIG. 1). However, the present invention is not limited to this. The damping coupling mechanism 3 may be disposed so that the V-shape is convex toward the outside of the structure 1 (the torsion member 5 is disposed on the right side in FIG. 1). Alternatively, one of the two damping coupling mechanisms 3 and 3 may have a V-shape projecting toward the side wall 1a and the other with a V-shape projecting outward.

  In addition, the earthquake-proof structure of the structure of this invention is not limited only to the above-mentioned embodiment, Of course, various changes can be added within the range which does not deviate from the summary of this invention.

1 Structure (Boiler body)
1a Side wall (furnace wall)
1b Overhang member 2 Support steel column (support column)
DESCRIPTION OF SYMBOLS 3 Damping connection mechanism 5 Torsion member 6 1st arm member 7 2nd arm member 8 Connection member 10 1st support base 11 2nd support base

Claims (5)

A projecting member projecting horizontally from a side wall of the structure, a support column that receives an excitation force due to the shaking of the structure, and an excitation from the structure by connecting the projecting member and the support column. An anti-seismic structure for a structure, comprising a damping coupling mechanism that attenuates and transmits force to the support column,
The damping connection mechanism includes a torsion member capable of torsional deformation, a first arm member having one end fixed to the torsion member and the other end rotatably connected to the support column, and one end A second arm member having a portion fixed to the torsion member and the other end portion rotatably connected to the overhanging member,
The first arm member and the second arm member are configured to be V-shaped when viewed from the axial direction of the torsion member,
When a load due to horizontal shaking is generated in the structure, a V-shape formed by the first arm member and the second arm member narrows or widens when the load from the structure is transmitted to the support column. Thus, a torsional deformation is generated in the torsion member, and when the torsion member exceeds an elastic region, a plastic deformation is generated to absorb energy and attenuate a vibration. Two of the overhang members are arranged on the side wall so as to sandwich the support column,
The earthquake-proof structure according to claim 1, wherein both sides of the support column are connected to the projecting member by the damping connection mechanism. The damping coupling mechanism is
A first support pedestal fixed to the support column and disposed at the other end of the first arm member;
A second support pedestal fixed to the overhanging member and disposed at the other end of the second arm member;
A connecting member that connects the first arm member to the first support base fixed to the support column so as to be rotatable at least in the horizontal direction;
A connecting member that connects the second arm member so as to be rotatable at least in the horizontal direction with respect to the second support base fixed to the projecting member;
The earthquake-proof structure for a structure according to claim 1, further comprising:   The said connection member connects the other end of the said arm member and the said support base with a pin joint or a universal joint structure, The earthquake-proof structure of the structure of Claim 3 characterized by the above-mentioned.   The said structure is a boiler main body, The said side wall is a furnace wall, The earthquake-proof structure as described in any one of Claims 1-4 characterized by the above-mentioned.

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