JP6707992B2 - Damper structure and damper manufacturing method - Google Patents

Description

The present invention relates to a damper structure provided on an axial force member on which a tensile load or a compressive load acts, and a method for manufacturing a damper provided on an axial force member on which a tensile load or a compressive load acts.

Conventionally, for example, as disclosed in Patent Documents 1 to 3, as a means for effectively absorbing energy between structural members that cause relative displacement in opposite directions, and for solving the functional deterioration due to eccentricity between the structural members. There are proposed steel dampers and the like.

The steel damper disclosed in Patent Document 1 is straddled between structural members that are separated from each other and generate relative displacement in opposite directions, and receives a bending force due to an axial force when the structural members are relatively displaced. is there. The steel damper disclosed in Patent Document 1 has a shaft portion connected to each structural member and facing each other with a distance on the same axis line, and both ends of the shaft portion that cross over the shaft line while bypassing the axis line. The bending member is joined to the portion and bears a bending moment.

The triple-tube vibration control brace disclosed in Patent Document 2 is configured such that stiffening tubes that prevent buckling of the axial force tube are concentrically arranged inside and outside the axial force tube, respectively. The triple pipe damping brace disclosed in Patent Document 2 has a plurality of elongated holes or concave recessed grooves extending in the axial direction formed in the triple pipe structure portion of the axial force pipe to intentionally reduce the cross section of the axial force pipe. It is characterized in that it is formed into a shape.

The hood stopper structure disclosed in Patent Document 3 is provided with a stopper member so that the hood comes into contact with the hood such as an automobile hood in a closed position. In the hood stopper structure disclosed in Patent Document 3, a slit is provided in a peripheral wall portion of a case member that serves as a stopper member, and energy is absorbed in the case member that vertically plastically deforms when a load of a predetermined value or more is applied. It is characterized by having a member.

JP-A-5-263549 JP, 2006-299576, A JP, 2003-285717, A

Here, the steel material damper disclosed in Patent Document 1 is particularly laid across between the structural members serving as the axial force members, and both shaft portions of the steel material damper are connected to end surfaces of the respective structural members facing each other. It is provided by that. At this time, in the steel material damper disclosed in Patent Document 1, the shaft portion for connecting to the structural member and the bending material that bears the bending moment are composed of different members, so the manufacturing cost of each member and the shaft The processing cost for joining the portion and the bending material increases.

Further, in the steel damper disclosed in Patent Document 1, a U-shaped bending material is formed by bypassing the axis line between both shaft portions, and only the bending portion of the U-shaped bending material undergoes shear deformation. Since bending yields, the continuous portion of the bending portion and the connecting portion of the bending material does not deform like a hinge. Further, in the steel damper disclosed in Patent Document 1, the U-shaped bending material is easily deformed in the axis orthogonal direction, and it is necessary to suppress deformation in the axis orthogonal direction by using a thick steel plate as the bending material. Therefore, the amount of steel material required to manufacture the bending material increases, which increases the material cost of the bending material.

Further, in the triple pipe damping brace disclosed in Patent Document 2, since stiffening pipes for preventing buckling of the axial force pipe are concentrically arranged inside and outside the axial force pipe, respectively, the steel material The increase in the amount increases the material cost and the processing cost for forming the axial force tube into the triple tube structure. Further, the triple pipe damping brace disclosed in Patent Document 2 intentionally reduces the cross section of the axial force pipe, by inducing the axial yield of the axial force pipe to absorb energy.

The hood stopper structure disclosed in Patent Document 3 is intended to absorb energy against a collision load in a hood of an automobile, and to a repeated load generated by an earthquake force in an axial force member such as a building. It is not intended to absorb energy. Further, the hood stopper structure disclosed in Patent Document 3 plastically deforms the energy absorbing member in the case member to absorb energy, and repeatedly absorbs energy against alternately acting tensile load and compressive load. Not a thing.

Therefore, the present invention has been devised in view of the above-described problems, and an object thereof is a damper structure that can be manufactured at a low manufacturing cost while ensuring stable energy absorption performance. And a method for manufacturing a damper.

A damper structure according to a first aspect of the present invention is a damper structure provided on an axial force member on which a tensile load or a compressive load acts, comprising an energy absorbing portion provided on a part of an axial direction of the axial force member. The part has a plurality of cutouts cut out at a plurality of positions in the circumferential direction on the side plate formed in a substantially circular cross section, and a bent portion projected in the out-of-plane direction between the plurality of cutouts. is formed, when a tensile load or compressive load acts on the axial force member, the bent Ri Do shall stretch deformed axially portion, the cutout, both ends of the axial-away by bending away in it, than the middle portion in the axial direction protrudes both ends on both sides in the axial direction, characterized in Rukoto.

In the damper structure according to a second aspect of the present invention, in the first aspect of the present invention, the energy absorbing portion has a core member that is continuous to at least both ends in the axial direction of the bent portion and is inserted into an inner space surrounded by the side plate. Or, it is installed on the outer surface portion outside the side plate.

A damper structure according to a third invention is the damper structure according to the first invention or the second invention, wherein the energy absorbing portion plastically deforms a fold line bent in an out-of-plane direction of the bending part into a substantially hinge shape. It is characterized in that it is elastically deformable in the axial direction at the curved portion.

A damper structure according to a fourth aspect of the present invention is the damper structure according to any one of the first to third aspects, wherein the bent portions are two locations that are both ends in the axial direction and one location that is an intermediate portion in the axial direction. It is characterized in that folds bent in the out-of-plane direction are formed at three places.

A damper structure according to a fifth aspect of the present invention is the damper structure according to any one of the first to fourth aspects, wherein the bent portion has a circumference at both axial end portions rather than a circumferential width dimension at an axial middle portion. It is characterized in that the width dimension in the direction becomes large.

A damper manufacturing method according to a sixth aspect of the present invention is a method of manufacturing a damper provided on an axial force member on which a tensile load or a compressive load acts, wherein a notch is provided in an energy absorbing portion provided at a part of the axial force member in the axial direction. A step of forming a portion and a compression step of forming a bent portion in the energy absorbing portion, wherein in the notching step, a plurality of side plates formed in a substantially circular cross section of the energy absorbing portion are arranged in the circumferential direction. At a location, by bending both ends in the axial direction, and notching by protruding both ends in the axial direction from both ends in the axial direction , a plurality of the notches are formed in the side plate, and In the compression step, by compressing the side plate of the energy absorbing portion in the axial direction, the side plate between the plurality of notches is formed with the bent portion protruding in an out-of-plane direction. To do.

A damper manufacturing method according to a seventh invention is the damper manufacturing method according to the sixth invention, wherein in the notching step, both axial end portions of the notch portion are notched by being curved in a substantially arc shape with a predetermined radius of curvature, The width dimension in the circumferential direction at the axially intermediate portion of the cutout portion is at least twice the radius of curvature at both axial end portions of the cutout portion.

According to the first invention to the seventh invention, when the tensile load and the compressive load are alternately applied to the axial force member, the energy absorbing portion expands and contracts in the axial direction of the axial force member, so that an earthquake, a wind, or the like occurs. It is possible to secure stable energy absorption performance against repeated external force.

According to the first invention to the seventh invention, sufficient tensile strength or compression strength is ensured by the side plate of the energy absorbing portion, and the length dimension of the bent portion, the protruding height, the type of steel material or the plate thickness, etc. Can be set appropriately, so that it is possible to provide an energy absorbing portion having a high degree of freedom in design.
According to the first invention to the seventh invention, when the folds at both ends of the bent portion are deformed into a substantially hinge shape, stress concentration occurs at both ends of the notch, but both ends of the notch are Since the stress concentration at both ends of the cutout is dispersed by bending the cutout into a substantially arcuate shape, it is possible to prevent cracks from occurring in the side plates at both ends of the cutout.

In particular, according to the second aspect of the invention, the core member is axially continuous to both ends of the bent portion, the core member is inserted into the inner space of the energy absorbing unit, or the core member is installed on the outer surface portion. Thus, the energy absorbing part is expanded and contracted while the core material is continuously extended to both ends of the bent part, and relative displacement of both ends of the bent part in the direction orthogonal to the axis is suppressed. It is possible to suppress the buckling of the entire structure.

In particular, according to the third aspect of the invention, when a tensile load or a compressive load is applied, the folds bent in the out-of-plane direction of the bent portion are plastically deformed into a substantially hinge shape, thereby exhibiting stable energy absorption performance. Therefore, it is possible to secure sufficient tensile strength or compression strength without using a thick steel plate or the like as the energy absorbing portion, and to suppress the material cost and the processing cost of the energy absorbing portion.

In particular, according to the fourth aspect of the invention, since the folds of the bent portion are formed at three places, the rigidity of the bent portion formed in a substantially triangular shape is increased, so that the stability of energy absorption performance is improved. It becomes possible.

In particular, according to the fifth aspect of the invention, the width dimension at both ends is larger than the width dimension at the middle portion of the bent portion, so that the crease is surely formed at substantially the center of the middle portion of the bent portion. Therefore, it becomes possible to provide a highly accurate energy absorption part.

In particular, according to the sixth aspect of the invention, since a bent portion can be easily formed from a circular steel pipe or the like through a notch process and a compression process without using a viscoelastic damper or the like having a high temperature dependency, it is an inexpensive manufacturing. It is possible to manufacture the damper structure at a cost.

In particular, according to the seventh aspect of the invention, the width dimension at the middle portion of the cutout portion is at least twice the radius of curvature at the both end portions of the cutout portion, so that both end portions of the bent portion are more than the middle portion. Since the cross-section loss of the side plate becomes small at the position where, when the side plate of the energy absorbing part is compressed in the compression step, unexpected buckling of the side plate is prevented, and both end portions of the bent part and It becomes possible to form a fold line at a predetermined position of the intermediate portion.

It is a perspective view showing a bearing wall in which a damper structure to which the present invention is applied is introduced. (A) is a front view showing a state before a horizontal force is applied to a load bearing wall to which a damper structure to which the present invention is applied is introduced, and (b) is a front view showing a state after the horizontal force is applied. It is a figure. (A) is a front view showing a state in which a tensile load is applied to an axial force member in a load bearing wall to which a damper structure to which the present invention is applied is introduced, and (b) is a front view showing a state in which a compressive load is applied. It is a figure. (A) is a front view showing an axial force member directly attached to a vertical frame or a horizontal frame in a damper structure to which the present invention is applied, and (b) is a front view showing an axial force member attached with a metal joint. is there. (A) is a plan view showing an energy absorbing part of a damper structure to which the present invention is applied, and (b) is a front view thereof. (A) is a front view which shows the notch of an energy absorption part in the damper structure to which this invention is applied, (b) is a front view which shows the bending part. (A) is a front view showing a substantially triangular bent portion in a damper structure to which the present invention is applied, (b) is a front view showing its extended state, and (c) is its contracted state. It is a front view which shows the extended state. (A) is a front view which shows the substantially arcuate bending part in the damper structure to which this invention is applied, (b) is a front view which shows the extended state, (c) is its contraction It is a front view which shows the extended state. (A) is a front view showing a substantially rectangular bent portion in a damper structure to which the present invention is applied, (b) is a front view showing its extended state, and (c) is its contracted state. It is a front view which shows the extended state. (A) is a plan view showing a core member inserted into an inner space of an energy absorbing part in a damper structure to which the present invention is applied, and (b) is a front view thereof. (A) is a top view which shows the core material installed in the outer surface part of the energy absorption part in the damper structure to which this invention is applied, and (b) is its front view. (A) is a front view showing a U-shaped bending material of a conventional steel damper, and (b) is a front view showing a state where only a bending portion of the bending material is sheared and deformed. (A) is a front view which shows the energy absorption part weld-bonded to the circular steel pipe used as an axial force member by the damper structure to which this invention is applied, (b) is the energy absorption bolt-bonded to the circular steel pipe. It is a front view which shows a part. (A) is a front view showing an energy absorbing part welded to H-section steel or the like serving as an axial force member in a damper structure to which the present invention is applied, and (b) is bolted to the H-section steel or the like. It is a front view which shows the energy absorption part. It is a front view which shows the manufacturing method of the damper to which this invention is applied. It is a front view which shows the notch which the side plate was notched in the notch process of the manufacturing method of the damper to which this invention is applied. It is a front view which shows the notch part which the side plate was notched in the notch process of the manufacturing method of the damper to which this invention is applied. It is a graph which shows the expansion-contraction deformation amount of a bending part at the time of tensile load loading and compression load loading by the FEM analysis result of the damper structure to which this invention is applied. (A) is a front view showing an energy absorption part in which a core material is inserted in a damper structure to which the present invention is applied, and (b) is a front view showing a state where the bent part is extended, FIG. 7C is a front view showing a state in which the bent portion is contracted.

Hereinafter, a mode for carrying out the damper structure 1 and the manufacturing method of the damper to which the present invention is applied will be described in detail with reference to the drawings.

As shown in FIG. 1, a damper structure 1 to which the present invention is applied is provided on an axial force member 2 of a building such as a house, a school, an office or a hospital facility. Further, the damper structure 1 to which the present invention is applied may be provided on the axial force member 2 of a building such as a plant structure or a steel tower.

The damper structure 1 to which the present invention is applied is particularly provided on the axial force member 2 on which the tensile load Pt or the compressive load Pc acts. The damper structure 1 to which the present invention is applied is provided on an axial force member 2 such as a column member, a beam member or a brace member 20 and is used as a load bearing wall 7 of a building.

The load bearing wall 7 is provided as a wall body of a building such as a steel house, a steel frame prefab or a wooden house. The load bearing wall 7 is surrounded on all sides by a pair of vertical frames 71 and a pair of horizontal frames 72, and a predetermined frame inner space 70 is formed. The bearing wall 7 has a height dimension H of about 2300 mm and a width dimension W of about 910 mm, for example, as shown in FIG.

As shown in FIG. 2( a ), the load bearing wall 7 is provided with the axial force member 2 serving as the brace member 20 inclined to each of the upper portion 70 a and the lower portion 70 b of the frame inner space 70. At this time, in the upper part 70a of the frame inner space 70, the brace member 20 is provided so as to be inclined from the upper side of one vertical frame 71 to the other vertical frame 71, and in the lower part 70b of the frame inner space 70, the other brace 20 is inclined. The brace member 20 is provided so as to be inclined from the vertical frame 71 to the lower side of one vertical frame 71.

As shown in FIG. 2B, the load bearing wall 7 is displaced so that each vertical frame 71 tilts in the horizontal direction when a horizontal force F is applied by an earthquake or wind. At this time, in the load bearing wall 7, for example, the tensile load Pt acts on the brace member 20 in the upper portion 70a of the frame inner space 70, and the compressive load Pc acts on the brace member 20 in the lower portion 70b of the frame inner space 70. ..

As shown in FIG. 3, the load bearing wall 7 may be provided with the axial force member 2 serving as the brace member 20 extending from the upper portion 70a to the lower portion 70b of the frame inner space 70. At this time, in the upper portion 70a of the frame inner space 70, one end portion 20a of the brace member 20 is obliquely attached to the upper side of one vertical frame 71, and in the lower portion 70b of the frame inner space 70, the other end portion 20a is inclined. The other end 20a of the brace member 20 is attached to the lower side of the vertical frame 71 in an inclined manner.

When the horizontal force F acts on the bearing wall 7 due to an earthquake, wind, or the like, as shown in FIG. 3A, for example, each vertical frame 71 is displaced so as to be tilted to the right, and the brace member is displaced. The tensile load Pt acts on 20. Then, as shown in FIG. 3B, when the vertical frames 71 of the load bearing wall 7 are displaced so as to tilt to the left, the compressive load Pc acts on the brace member 20.

Here, the load bearing wall 7 has, for example, a horizontal force F shown in FIG. 2(b) of 30 kN and a yield strength of each brace member 20 of 43 kN or more when the interlayer deformation angle is 1/50. It is necessary to secure the deformation performance of the brace material 20 of 17 mm or more. For this reason, the energy-bearing wall 7 is provided with the energy absorbing portion 3 in order to ensure a predetermined yield strength and deformability of each brace member 20.

As shown in FIG. 4, the bearing wall 7 has the end portion 20 a of the brace member 20 attached to the vertical frame 71 or the horizontal frame 72. At this time, as shown in FIG. 4A, the end portion 20a of the brace member 20 may be directly attached to the load bearing wall 7 by welding or the like. As shown in FIG. 4( b ), the load-bearing wall 7 is such that the metal joint 6 attached to the end 20 a of the brace member 20 by welding or the like is attached to the vertical frame 71 and the horizontal frame 72 by bolting or the like. May be.

As shown in FIG. 5, the damper structure 1 to which the present invention is applied includes an energy absorbing portion 3 provided in a part of the axial force member 2 in the axial direction Z. For the axial force member 2, a circular steel pipe or the like formed in a closed cross-sectional shape having a substantially circular cross-section is used. For example, the plate thickness t of the circular steel pipe or the like is about 1.0 mm to 6.0 mm, and the outside in the circumferential direction X. The diameter D is about 20 mm to 200 mm.

As shown in FIG. 5A, the energy absorbing section 3 has a side plate 31 formed in a substantially circular cross section. At this time, in the energy absorbing portion 3, the cross-sectional shape of the side plate 31 with respect to the axial direction Z of the axial force member 2 is formed into a substantially perfect circular shape or a substantially elliptical shape, and is substantially hollow inside the side plate 31. The inner space 30 is formed. Further, in the energy absorbing portion 3, the outer surface portion 32 is on the outer side of the side plate 31 on the side opposite to the inner space portion 30.

As shown in FIG. 5B, in the energy absorbing portion 3, the side plate 31 is formed continuously in the circumferential direction X, and the direction substantially orthogonal to the axial direction Z is the out-of-plane direction Y of the side plate 31. The energy absorbing portion 3 has a plurality of notches 4 cut out at a plurality of positions in the circumferential direction X and a plurality of bent portions 5 protruding in the out-of-plane direction Y between the plurality of notches 4 as side plates. 31 is formed.

As shown in FIG. 6A, the cutout portion 4 is formed in a predetermined cutout shape when the side plate 31 is cut out in the plate thickness direction. Both ends 4a in the axial direction Z of the cutout portion 4 are bent in a substantially arcuate shape or the like so as to be cut out so that the both ends 4a project to both sides in the axial direction Z more than the intermediate portion 4b in the axial direction Z.

As shown in FIG. 6( b ), the bent portion 5 is formed in a bent shape extending in the axial direction Z when the side plate 31 is bent in the out-of-plane direction Y. The bent portion 5 has a fold line 51 that is bent toward the outside in the out-of-plane direction Y at both ends 5a in the axial direction Z, and is directed toward the inside in the out-of-plane direction Y at the intermediate portion 5b in the axial direction Z. The folded fold line 51 is formed.

The bent portion 5 is a fold 51 formed at both ends 5a and an intermediate portion 5b in the axial direction Z, and has a predetermined width dimension in the circumferential direction X. At this time, in the bent portion 5, the width dimension wa in the circumferential direction X at both end portions 5a in the axial direction Z is larger than the width dimension wb in the circumferential direction X at the intermediate portion 5b in the axial direction Z. In addition, in the bent portion 5, if necessary, the width dimension wb at the intermediate portion 5b in the axial direction Z and the width dimension wa at both end portions 5a in the axial direction Z are substantially the same. Good.

As shown in FIG. 7, the bent portion 5 has a length dimension b in the axial direction Z of about 10 mm to 50 mm, a protruding height h of the out-of-plane direction Y of about 10 mm to 50 mm, and a plate thickness t of 1. The length is about 0 mm to 6.0 mm, and the fold line 51 is bent or bent. When the bent portion 5 is bent at the fold 51 and bent, for example, the radius of curvature r1 on the inner peripheral side of the fold 51 is set to be equal to or larger than the plate thickness t of the bent portion 5, and The radius of curvature r2 on the outer peripheral side of 51 is set to be twice or more the plate thickness t of the bent portion 5.

In the bent portion 5, folds 51 formed by bending in the out-of-plane direction Y are arranged at two or more positions at both ends 5a and the intermediate part 5b in the axial direction Z. The bent portions 5 are, for example, two places which are both end portions 5a in the axial direction Z and one place which is an intermediate portion 5b in the axial direction Z, and three folds 51 bent in the out-of-plane direction Y are formed. By doing so, it is formed into a substantially triangular shape.

When the bent portion 5 is formed in a substantially triangular shape, the side plate 31 extends in a substantially straight line from the fold 51 of both end portions 5a in the axial direction Z to the fold 51 of the intermediate portion 5b. The side plate 31 is formed with an inclination angle θ of about 15° or more and 43° or less with respect to the orthogonal direction.

As shown in FIG. 8, the bent portion 5 may have folds 51 formed only at two positions serving as both ends 5a in the axial direction Z, as shown in FIG. At this time, the bent portion 5 assumes that the folds 51 are not formed in the intermediate portion 5b in the axial direction Z, and between the folds 51 serving as both end portions 5a in the axial direction Z and the folds 51, a substantially arc shape or a substantially fold is formed. The side plate 31 curved in an elliptic arc shape or the like is formed.

As shown in FIG. 9, the bent portion 5 has two folds 51 at both ends 5a in the axial direction Z and two intermediate portions 5b in the axial direction Z, and folds 51 are formed at four positions. Thus, it may be formed in a substantially rectangular shape. The folding part 5 may have four folds 51 formed in a substantially trapezoidal shape or a substantially inverted trapezoidal shape. In this case as well, in the same manner as in the case of being formed in a substantially triangular shape, the folding direction is orthogonal to the axis. The side plate 31 that is inclined at an inclination angle θ of 15° or more and 43° or less may be formed.

As shown in FIG. 5, the energy absorbing portion 3 may be used in a state in which the inner hollow portion 30 formed by being surrounded by the side plate 31 is in a substantially hollow state, but if necessary, as shown in FIG. In addition, the core material 60 such as a circular steel pipe may be inserted into the inner space 30 surrounded by the side plate 31. At this time, the energy absorbing portion 3 is continuous to at least both end portions 5a of the bent portion 5 in the axial direction Z, and the core material 60 having a predetermined rigidity is provided in the inner hollow portion 30.

Further, as shown in FIG. 11, the energy absorbing portion 3 may be formed with folds 51 that are bent inward in the out-of-plane direction Y at both ends 5 a of the bent portion 5. At this time, the energy absorbing part 3 is made continuous to at least both ends 5a in the axial direction Z of the bent part 5, and the core material 60 such as a circular steel pipe is installed on the outer surface part 32 outside the side plate 31. Become.

As shown in FIGS. 7 to 9, the energy absorbing portion 3 expands and contracts in the axial direction Z at the bending portion 5 especially when a tensile load Pt or a compressive load Pc in the axial direction Z acts on the axial force member 2. It will be transformed. The energy absorbing portion 3 is bent into a substantially trapezoidal shape or an inverted trapezoidal shape as shown in FIGS. 9B and 9C from a state before being stretched and deformed by the bending portion 5. May be formed.

As shown in FIG. 7B, FIG. 8B, and FIG. 9B, the energy absorbing portion 3 has the axial direction Z of the bending portion 5 when the tensile load Pt acts on the axial force member 2. Both end portions 5a of the are displaced in the direction away from each other in the axial direction Z. At this time, the bent portion 5 is deformed so that the inclination angle θt at the fold line 51 with respect to the axis orthogonal direction becomes large and the bent portion 5 extends in the axial direction Z.

As shown in FIGS. 7(c), 8(c), and 9(c), the energy absorbing portion 3 has an axial direction Z of the bending portion 5 when a compressive load Pc acts on the axial force member 2. Both end portions 5a of the are displaced in the axial direction Z in directions approaching each other. At this time, the bent portion 5 is deformed so that the inclination angle θc at the fold line 51 with respect to the axis orthogonal direction becomes small and the bent portion 5 contracts in the axial direction Z.

When the tensile load Pt or the compressive load Pc acts on the axial force member 2, the energy absorbing portion 3 plastically deforms the fold line 51 of the bent portion 5 bent in the out-of-plane direction Y into a substantially hinge shape, The bending portion 5 expands and contracts in the axial direction Z. At this time, the energy absorbing portion 3 is stable due to the substantially hinge-like plastic deformation at the folds 51 of the both end portions 5a and the intermediate portion 5b of the bent portion 5, regardless of whether the side plate 31 is sheared or bent. Demonstrate the energy absorption performance.

On the other hand, in the conventional steel damper 9, as shown in FIG. 12, only the upper and lower bent portions 91a of the U-shaped bent member 91 are shear-deformed, and the energy is generated only by the shear deformation of the bent portion 91a. Exhibits absorption performance. At this time, in the conventional steel damper 9, only the bending portion 91a undergoes shear deformation and bending yielding, so that the continuous portion 91c of the bending portion 91a and the connecting portion 91b does not deform like a hinge.

As shown in FIG. 5, the energy absorbing portion 3 uses a part of the axial force member 2 itself, such as a circular steel pipe, in the axial direction Z as a side plate 31 of the energy absorbing portion 3 in the notch portion 4 and the folding portion of the axial force member 2 itself. By forming the curved portion 5, it is provided integrally with the axial force member 2 in a part of the axial force member 2 in the axial direction Z.

The energy absorbing portion 3 is not limited to this, and as shown in FIGS. 13 and 14, a side plate 31 manufactured independently of the axial force member 2 is attached to the end portion 2a of the axial force member 2, It may be provided as a member independent of the axial force member 2 in a part of the axial force member 2 in the axial direction Z.

At this time, the energy absorbing portion 3 divides the axial force member 2 in the axial direction Z, and is installed on the pair of end portions 2 a that divide the axial force member 2. The energy absorbing portion 3 may be welded to the end portion 2a of the circular steel pipe serving as the axial force member 2 as shown in FIG. 13(a), or as shown in FIG. 13(b), the circular steel pipe. In addition to being bolted to the end portion 2a, it may be attached by screw joining, nail joining, pin joining, or the like.

As shown in FIG. 14, the energy absorbing portion 3 is provided in a part of the axial force member 2 such as an H-shaped steel having a substantially H-shaped cross section or a channel steel having a substantially C-shaped cross section. May be. At this time, as shown in FIG. 14A, the energy absorbing portion 3 may be welded or joined by inserting the end portion 2a of the H-shaped steel or the like serving as the axial force member 2 into the inner hollow portion 30. Further, as shown in FIG. 14B, the side plate 31 crushed to be substantially flat may be bolted to the end portion 2a of the H-shaped steel or the like, or may be attached by screw bonding, nail bonding, pin bonding, or the like. Good.

The damper structure 1 to which the present invention is applied is manufactured by using the damper manufacturing method to which the present invention is applied, as shown in FIG. The damper manufacturing method to which the present invention is applied includes a notch step of forming a notch portion 4 and a compression step of forming a bent portion 5 in the energy absorbing portion 3 provided in a part of the axial force member 2 in the axial direction Z. With.

In the notch step, as shown in FIG. 15A, the plurality of notches 4 are formed by notching the side plate 31 of the energy absorbing section 3 formed in a substantially circular cross section at a plurality of positions in the circumferential direction X. 31 is formed. At this time, in the notch step, the side plate 31 is notched in the plate thickness direction, so that both ends 4a of the notch 4 in the axial direction Z are bent in a substantially arc shape or the like and are notched.

In the notch step, as shown in FIGS. 16 and 17, in particular, both ends 4a of the notch 4 in the axial direction Z are notched by being curved in a substantially arc shape with a predetermined curvature radius r. Then, the width dimension db in the circumferential direction X at the intermediate portion 4b of the cutout portion 4 in the axial direction Z may be twice or more the radius of curvature r at both end portions 4a of the cutout portion 4 in the axial direction Z. desirable.

In the notch step, as shown in FIG. 16, by cutting the side plate 31 in a substantially linear shape from both ends 4a in the axial direction Z of the notch 4 to substantially the center, the intermediate portion 4b in the axial direction Z is substantially linear. The notch 4 is formed. At this time, as shown in FIG. 16A, in the cutout portion 4, the width dimension db at the intermediate portion 4b in the axial direction Z becomes substantially the same as the width dimension da at both end portions 4a in the axial direction Z.

In the notch step, as shown in FIG. 16(b), the middle portion 4b of the notch portion 4 in the axial direction Z is notched by bending only the substantially central portion, or as shown in FIG. 16(c). You may incline from the both ends 4a of the notch part 4 of the axial direction Z to substantially the center, and may notch. At this time, in the cutout portion 4, the width dimension db at the intermediate portion 4b in the axial direction Z becomes larger than the width dimension da at both end portions 4a.

In the notch step, the notch 4 in which the intermediate portion 4b in the axial direction Z is substantially linear is formed, and as shown in FIG. 17, the notch 4 is formed by notching the side plate 31 in a substantially circular shape. Good. At this time, the width dimension db of the cutout portion 4 at the intermediate portion 4b in the axial direction Z is larger than the width dimension da at the both end portions 4a, and as shown in FIG. The notch 4 is formed, or as shown in FIG. 17B, the notch 4 having a substantially perfect circle shape is formed.

In the compression step, as shown in FIG. 15B, by compressing the side plate 31 of the energy absorbing portion 3 in the axial direction Z, the side plate 31 of the energy absorbing portion 3 gradually bends and projects in the out-of-plane direction Y. .. Then, in the compression step, by compressing the side plate 31 of the energy absorbing unit 3 by a predetermined compression amount, as shown in FIG. The bent portion 5 is formed so as to be projected.

In the compression step, as shown in FIG. 5, when a part of the axial force member 2 itself is used as the side plate 31 of the energy absorbing portion 3, the axial force member 2 itself is compressed in the axial direction Z to absorb the energy. The side plate 31 of the part 3 is compressed in the axial direction Z. When the energy absorbing portion 3 is manufactured independently of the axial force member 2, the axial force member 2 is compressed after the side plate 31 of the energy absorbing portion 3 is compressed, as shown in FIGS. 13 and 14. The energy absorbing portion 3 may be attached to the end portion 2a of the.

Here, in the damper structure 1 to which the present invention is applied, as shown in FIGS. 7 to 9, the tensile load Pt and the compressive load Pc are alternately applied to the axial force member 2 due to the repeated external force such as earthquake or wind. When acting, the energy absorbing portion 3 expands and contracts at the bent portion 5. In the damper structure 1 to which the present invention is applied, the energy absorbing portion 3 expands and contracts in the axial direction Z of the axial force member 2 to ensure stable energy absorbing performance against repeated external force such as earthquake or wind. Is possible.

In order to verify the energy absorption performance of the damper structure 1 to which the present invention is applied, FEM analysis of shell element model was performed. Here, the length dimension b of the bent portion 5 shown in FIG. 7 is 30 mm, the protrusion height h is 26 mm, the steel material is STK400 (JIS G 3444), and the plate thickness t is 4.5 mm or 6 mm and uniform. Further, the cutouts 4 are formed at six positions in the circumferential direction X of the side plate 31, and the width dimension da at both ends 4a in the axial direction Z shown in FIG. 16(a) is 6 mm or 30 mm, The outer diameter D of the axial force member 2 shown in FIG. 5 was set to 114.3 mm.

FIG. 18 shows the result of the FEM analysis of the amount of expansion and contraction deformation in the axial direction Z at the bending portion 5 based on the state before the tensile load Pt or the compressive load Pc is applied to the axial force member 2. Here, the tensile load Pt (the positive direction of the vertical axis) and the compressive load Pc (the negative direction of the vertical axis) that act in the axial direction Z of the axial force member 2, and the amount of extensional deformation of the bending portion 5 in the axial direction Z. The relationship between (the positive direction of the horizontal axis) and the amount of contraction deformation (negative direction of the horizontal axis) is shown. In addition, here, the target proof strength Pp of the axial force member 2 in the axial direction Z in a general house is shown as 43 kN.

As shown in FIG. 18, the damper structure 1 to which the present invention is applied, regardless of whether a tensile load Pt or a compressive load Pc is applied to the axial force member 2, the axial proof member 2 has a tensile proof stress or a target proof stress Pp or more. It can be seen that the compression strength can be secured. Then, the damper structure 1 to which the present invention is applied has a remarkable increase in yield strength and buckling after the tensile load Pt or the compression load Pc exceeds the target yield strength Pp, regardless of the expansion/contraction deformation increase at the bent portion 5. No decrease in proof stress due to stress is observed, and stable behavior is exhibited during tensile loading and compression loading.

Therefore, it can be seen that the damper structure 1 to which the present invention is applied can suppress an unnecessary increase in tensile strength or compression strength while ensuring the predetermined tensile strength, compression strength and deformation performance required for the axial force member 2. .. Further, in the damper structure 1 to which the present invention is applied, the tensile load Pt and the compressive load Pc have similar gradual increasing tendencies in the positive and negative directions of the horizontal axis. Therefore, the damper structure 1 expands and contracts when the tensile load Pt is loaded and when the compressive load Pc is loaded. It can be seen that the difference in behavior of deformation is also small. From the above, it was also verified from the result of the FEM analysis that the damper structure 1 to which the present invention is applied exhibits stable energy absorption performance due to the energy absorbing portion 3 expanding and contracting in the axial direction Z.

Further, in the damper structure 1 to which the present invention is applied, even if the width dimension da at both end portions 4a of the cutout portion 4 is set to 6 mm or 30 mm, the axial force member 2 has a tensile yield strength equal to or higher than the target yield strength Pp. It can be seen that the compression strength can be secured. Therefore, in the damper structure 1 to which the present invention is applied, regardless of the size in the circumferential direction X of the cutout portion 4 in which the side plate 31 of the energy absorption portion 3 is cut out, sufficient tensile strength or compression strength is ensured. Is possible.

Further, in the damper structure 1 to which the present invention is applied, the length dimension b of the bent portion 5, the protruding height h, the type of steel material, the plate thickness t, the number formed in the circumferential direction X, and the like can be appropriately set. Therefore, it is possible to provide the energy absorbing section 3 having a high degree of freedom in design. In the damper structure 1 to which the present invention is applied, the plurality of bent portions 5 are substantially evenly arranged in the circumferential direction X of the axial force member 2 so that the bent portion 5 is expanded and contracted in the axial direction Z. It becomes possible to suppress the eccentricity with respect to.

As shown in FIG. 10 and FIG. 11, the damper structure 1 to which the present invention is applied is arranged such that at least both ends 5a of the bent portion 5 are continuous in the axial direction Z, and the core member is provided in the inner space 30 of the energy absorbing portion 3. 60 may be inserted, or the core material 60 may be installed on the outer surface portion 32. At this time, in the damper structure 1 to which the present invention is applied, as shown in FIG. 19, both ends 5a of the bent portion 5 are maintained while maintaining the state where the core material 60 is continuous to both ends 5a of the bent portion 5. Slide in the axial direction Z and are displaced in a direction in which they move away from or approach each other. Thereby, in the damper structure 1 to which the present invention is applied, the core material 60 is inserted into the inner space portion 30, or the energy absorbing portion 3 expands and contracts while the core material 60 is installed on the outer surface portion 32. Since both end portions 5a of the bent portion 5 are restrained from being relatively displaced in the direction orthogonal to the axis, it is possible to restrain the entire buckling of the damper structure 1.

In the damper structure 1 to which the present invention is applied, as shown in FIGS. 7 to 9, by bending the fold 51 of the bent portion 5, the plasticized region when the fold 51 is deformed into a substantially hinge shape becomes large. .. At this time, in the damper structure 1 to which the present invention is applied, the cumulative strain at the folds 51, which is the strain when the energy absorbing part 3 is compressed and the strain when the energy absorbing part 3 is expanded and contracted, becomes small, and the yield strength increases due to work hardening. Is suppressed and resistance characteristics against low cycle fatigue are improved. Further, in the damper structure 1 to which the present invention is applied, as shown in FIG. 7, since the folds 51 of the bent portion 5 are formed at three places, the rigidity of the bent portion 5 formed in a substantially triangular shape is improved. Since it is increased, it becomes possible to improve the stability of the energy absorption performance.

The damper structure 1 to which the present invention is applied is stable by plastically deforming the fold line 51 bent in the out-of-plane direction Y of the bent portion 5 into a substantially hinge shape when a tensile load Pt or a compressive load Pc is applied. Demonstrate the energy absorption performance. Therefore, the damper structure 1 to which the present invention is applied does not have the energy absorbing performance because the bending portion 91a alone undergoes shear deformation unlike the conventional steel damper 9 shown in FIG. It is not required to use thick steel plate or the like. As a result, the damper structure 1 to which the present invention is applied can secure sufficient tensile strength or compression strength without using a thick steel plate or the like, so that it is possible to suppress the material cost and processing cost of the energy absorbing section 3. Become.

In the damper manufacturing method to which the present invention is applied, as shown in FIGS. 15 to 17, a steel pipe manufactured through a notch process and a compression process is used without using a viscoelastic damper having a high temperature dependency. .. At this time, according to the damper manufacturing method to which the present invention is applied, since the bent portion 5 can be easily formed from the circular steel pipe or the like through the notch process and the compression process, the damper structure 1 is manufactured at a low manufacturing cost. It becomes possible.

In the damper manufacturing method to which the present invention is applied, when the side plate 31 of the energy absorbing unit 3 is compressed in the compression step and the side plate 31 of the energy absorbing unit 3 is gradually bent, stress concentration at both ends 4a of the notch 4 is caused. Occurs. Further, in the damper structure 1 to which the present invention is applied, stress concentration occurs at both end portions 4a of the cutout portion 4 even when the folds 51 of both end portions 5a of the bent portion 5 are deformed into a substantially hinge shape. At this time, in the damper structure 1 to which the present invention is applied, the stress concentration at both end portions 4a of the cutout portion 4 is dispersed particularly by bending the both end portions 4a of the cutout portion 4 into a substantially arc shape or the like. It is possible to prevent cracks or breaks from occurring in the side plates 31 at both ends 4a of the cutout 4.

Further, in the method of manufacturing the damper to which the present invention is applied, the width dimension db at the intermediate portion 4b of the cutout portion 4 is at least twice the radius of curvature r at both end portions 4a of the cutout portion 4, The cross-section loss of the side plate 31 becomes smaller at the positions at both end portions 5a than the intermediate portion 5b of the bent portion 5. Therefore, the damper manufacturing method to which the present invention is applied prevents the unexpected bending of the side plate 31 when the side plate 31 of the energy absorbing unit 3 is compressed in the compression step, and prevents the bending portion from bending. It is possible to form the fold line 51 at a predetermined position of both end portions 5a and the intermediate portion 5b of the fold 5.

In the damper manufacturing method to which the present invention is applied, in particular, as shown in FIGS. 16B, 16C, and 17, the width dimension db at the middle portion 4b of the cutout portion 4 at both ends 4a is It can be made larger than the width dimension da. At this time, as shown in FIG. 6B, the damper structure 1 to which the present invention is applied has both end portions than the width dimension wb at the middle portion 5b of the bent portion 5 in the state after the notch step and the compression step. The width dimension wa at 5a surely increases. In the damper structure 1 to which the present invention is applied, the width dimension wa at both end portions 5a is larger than the width dimension wb at the intermediate portion 5b of the bent portion 5, so that the middle portion 5b of the bent portion 5 is substantially centered. Since the fold line 51 is surely formed by, for example, it is possible to provide the energy absorbing section 3 with high accuracy.

Although the examples of the embodiments of the present invention have been described above in detail, the above-described embodiments are merely examples of specific embodiments for carrying out the present invention, and the technical aspects of the present invention are thereby described. The range should not be construed as limiting.

1: Damper structure 2: Axial force member 2a: Axial force member end 20: Brace material 20a: Brace material end 3: Energy absorbing part 30: Inner cavity 31: Side plate 32: Outer surface part 4: Notch part 4a : Both ends 4b of the cutout part: Intermediate part 5 of the cutout part: Bent part 5a: Both end parts 5b of the bent part: Intermediate part 51 of the bent part: Fold line 6: Joining metal 60: Core member 7: Bearing wall 70 : Frame inner space 70a: Upper part 70b: Lower part 71: Vertical frame 72: Horizontal frame Pc: Compressive load Pt: Tensile load X: Circumferential direction Y: Out-of-plane direction Z: Axial direction

Claims (7)

A damper structure provided on an axial member on which a tensile load or a compressive load acts,
An energy absorbing portion provided on a part of the axial force member in the axial direction is provided,
The energy absorbing portion has a plurality of notches cut out at a plurality of positions in the circumferential direction on a side plate formed in a substantially circular cross section, and a bend protruding in an out-of-plane direction between the plurality of notches. parts and is formed, when a tensile load or compressive load acts on the axial force member, Ri Do shall stretch deformation in the axial direction by the bent portion,
A damper structure, wherein both ends in the axial direction of the cutout portion are curved and cut out so that the both ends of the notch portion are projected to both sides in the axial direction more than the intermediate portion in the axial direction. The energy absorbing portion has a core material that is continuous to at least both ends in the axial direction of the bent portion, is inserted into an inner space surrounded by the side plate, or is installed on an outer surface portion outside the side plate. The damper structure according to claim 1, wherein: The energy absorbing portion is configured to be elastically deformed in the axial direction at the bent portion by plastically deforming a fold line bent in the out-of-plane direction of the bent portion into a substantially hinge shape. The damper structure according to Item 1 or 2. The bent portion is formed at two positions at both ends in the axial direction and at one position at an intermediate portion in the axial direction, and three folds bent in the out-of-plane direction are formed. Item 1. The damper structure according to any one of items 1 to 3 . The bent portion than the circumferential width dimension of the middle portion in the axial direction, one of claims 1-4 in which the width dimension of the circumferential direction at both end portions in the axial direction is equal to or larger 1 The damper structure described in paragraph. A method for manufacturing a damper provided on an axial force member on which a tensile load or a compressive load acts, comprising:
A notch step of forming a notch in the energy absorbing portion provided in a portion of the axial force member in the axial direction, and a compression step of forming a bent portion in the energy absorbing portion,
In the notch step, the side plates formed in a substantially circular cross section of the energy absorbing portion, at a plurality of locations in the circumferential direction, both ends in the axial direction are curved, and both ends in the axial direction rather than the middle part in the axial direction. By notching by protruding to both sides of , a plurality of the notches are formed in the side plate,
In the compressing step, the side plate of the energy absorbing unit is axially compressed to form the bent portion protruding in the out-of-plane direction on the side plate between the plurality of notches. The manufacturing method of the damper. In the notch step, both end portions in the axial direction of the notch portion are notched by being curved in a substantially arc shape with a predetermined radius of curvature, and a circumferential width dimension at an axially intermediate portion of the notch portion is obtained. The damper manufacturing method according to claim 6 , wherein the size of the damper is twice or more a radius of curvature at both axial end portions of the cutout portion.

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