US20170081845A1 - Brace member - Google Patents

Brace member Download PDF

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Publication number
US20170081845A1
US20170081845A1 US15/310,631 US201515310631A US2017081845A1 US 20170081845 A1 US20170081845 A1 US 20170081845A1 US 201515310631 A US201515310631 A US 201515310631A US 2017081845 A1 US2017081845 A1 US 2017081845A1
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US
United States
Prior art keywords
reinforcing
buckling restraining
core member
longitudinal direction
disposed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US15/310,631
Other languages
English (en)
Inventor
Tomohiro Kinoshita
Takumi Ishii
Kazuaki Miyagawa
Mitsutoshi Yoshinaga
Wataru Kitamura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
JFE Civil Engineering and Construction Corp
Original Assignee
JFE Steel Corp
JFE Civil Engineering and Construction Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by JFE Steel Corp, JFE Civil Engineering and Construction Corp filed Critical JFE Steel Corp
Assigned to JFE STEEL CORPORATION, JFE CIVIL ENGINEERING & CONSTRUCTION CORPORATION reassignment JFE STEEL CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KITAMURA, WATARU, MIYAGAWA, Kazuaki, YOSHINAGA, Mitsutoshi, ISHII, Takumi, KINOSHITA, TOMOHIRO
Publication of US20170081845A1 publication Critical patent/US20170081845A1/en
Abandoned legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
    • E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
    • E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
    • E04H9/0215—Bearing, supporting or connecting constructions specially adapted for such buildings involving active or passive dynamic mass damping systems
    • E04B1/985—
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
    • E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
    • E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
    • E04H9/0237—Structural braces with damping devices
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/92—Protection against other undesired influences or dangers
    • E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/30—Columns; Pillars; Struts
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
    • E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
    • E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F16F1/025—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant characterised by having a particular shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F7/00—Vibration-dampers; Shock-absorbers
    • F16F7/12—Vibration-dampers; Shock-absorbers using plastic deformation of members
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C2003/026—Braces
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
    • E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
    • E04H9/028—Earthquake withstanding shelters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2230/00—Purpose; Design features
    • F16F2230/0023—Purpose; Design features protective
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2230/00—Purpose; Design features
    • F16F2230/16—Purpose; Design features used in a strut, basically rigid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2236/00—Mode of stressing of basic spring or damper elements or devices incorporating such elements
    • F16F2236/04—Compression
    • F16F2236/045—Compression the spring material being generally enclosed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2238/00—Type of springs or dampers
    • F16F2238/04—Damper
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F7/00—Vibration-dampers; Shock-absorbers
    • F16F7/12—Vibration-dampers; Shock-absorbers using plastic deformation of members
    • F16F7/125—Units with a telescopic-like action as one member moves into, or out of a second member

Definitions

  • the present invention relates to brace members, and particularly to a brace member that includes a core member, which absorbs the seismic energy in occurrences of earthquakes, and a buckling restraining member, which stiffens the core member.
  • brace members installed in architectural structures to deal with occurrences of earthquakes include a core member, which absorbs seismic energy, and a stiffening member, which restricts out-of-plane (direction perpendicular to longitudinal direction) deformation that occurs when compressive force acts in the longitudinal direction of the core member.
  • the brace members prevent or retard an occurrence of buckling of the entirety of the core member even when the compressive axial force acts to cause stable deformation in the axial direction and enhance the ability to absorb seismic energy.
  • Patent Literature 1 The applicant of patent has disclosed a brace member (for example, see Patent Literature 1) that is easily manufacturable and that can prevent a weight increase as a result of eliminating a welding operation for disposing a core member and a stiffening member in a predetermined form and an operation of filling a space between the core member and the stiffening member with mortar.
  • crevices are connected, with screw threads, to both end portions of the core member that extends through the buckling restraining member and that is made of a steel bar.
  • a first end portion of the buckling restraining member is secured with screw threads to a first end portion of the core member with a retaining ring interposed therebetween, the retaining ring being screwed on the buckling restraining member and the core member.
  • a sleeve made of a steel pipe is secured, with a screw thread, to a second end portion of the core member.
  • the thickness of the sleeve is required to be smaller than half the difference between the inner diameter of the stiffening member and the outer diameter of the core member.
  • the inner surface of the stiffening member is preferably located near the outer surface of the core member to deliver its stiffening performance.
  • the thickness of the sleeve naturally has its limit. If the sleeve has a small bending strength due to this limit, the sleeve may be yielded due to bending in a range of the sleeve exposed beyond the buckling restraining member. In this case, the core member may be buckled within this range since no buckling restraining member is originally disposed between the second end surface of the buckling restraining member and the end portion of the crevice secured with a screw to the second end portion of the core member and the sleeve has been yielded.
  • a brace member includes a core member, a buckling restraining member through which the core member extends and that restricts out-of-plane deformation of the core member, a cap sleeve in which a first end portion of the core member on a first side in a longitudinal direction and a first end portion of the buckling restraining member on the first side in the longitudinal direction are disposed, a cap-sleeve crevice disposed on the cap sleeve so as to protrude toward a side opposite to a side on which the core member and the buckling restraining member are disposed, the cap-sleeve crevice serving as a joint for installing the brace member on an architectural structure, a reinforcing member in which a second end portion of the core member on a second side in the longitudinal direction is disposed, and a reinforcing-member crevice disposed on the reinforcing member so as to protrude toward a side opposite to
  • a brace member includes a core member, a buckling restraining member through which the core member extends and that restricts out-of-plane deformation of the core member, reinforcing members disposed individually on two ends of the core member in a longitudinal direction, and reinforcing-member crevices disposed individually on the reinforcing members so as to each protrude toward a side opposite to a side on which the core member is disposed, the reinforcing-member crevices serving as joints for installing the brace member on an architectural structure.
  • Each of the reinforcing members surrounds a predetermined area of the buckling restraining member extending from a corresponding one of end portions of the buckling restraining member in the longitudinal direction.
  • an inner diameter of the reinforcing member(s) in the range in which the reinforcing member(s) surrounds the buckling restraining member is constant in the longitudinal direction, and an outer diameter of the reinforcing member(s) in the range decreases toward a center of the buckling restraining member in the longitudinal direction.
  • the first end portion of the buckling restraining member on the first side in the longitudinal direction is disposed in the cap sleeve and a predetermined area of the buckling restraining member extending from the second end surface on the second side in the longitudinal direction is surrounded by the reinforcing member.
  • the reinforcing member surrounds the external circumferential surface of the buckling restraining member and the thickness of the reinforcing member is not limited.
  • the outer diameter (and the inner diameter) and the thickness can be increased, whereby the stiffness can be enhanced.
  • the brace member according to aspects of the present invention is a brace member having high (great) bending strength.
  • FIG. 1 illustrates a brace member according to a first embodiment of the present invention.
  • FIG. 1( a ) is a side view of the brace member and
  • FIG. 1( b ) is a sectional view of a main portion of the brace member viewed sideways.
  • FIG. 2 illustrates a specimen that undergoes a loading test to evaluate the performances of the brace member according to the first embodiment of the present invention and is a sectional view viewed sideways to define the length of each component.
  • FIG. 3 illustrates a specimen that undergoes a loading test to evaluate the performances of an existing brace member for use as a comparative example and is a sectional view viewed sideways to define the length of each component.
  • FIG. 4 has axial force-axial strain chart(s) showing the results of the loading test conducted to clarify the performances of the brace member according to the first embodiment of the present invention.
  • FIG. 4( a ) is a chart for a specimen No. 1
  • FIG. 4( b ) is a chart for a specimen No. 2.
  • FIG. 5 is an axial force-axial strain chart showing the results of the loading test conducted to clarify the performances of an existing brace member of a comparative example.
  • FIG. 6 illustrates a brace member according to a second embodiment of the present invention.
  • FIG. 6( a ) is a side view of the brace member and
  • FIG. 6( b ) is a sectional view of a main portion of the brace member viewed sideways.
  • FIG. 7 illustrates a brace member according to a third embodiment of the present invention.
  • FIG. 7( a ) is a side view of the brace member and
  • FIG. 7( b ) is a sectional view of a main portion of the brace member viewed sideways.
  • FIG. 1 illustrates a brace member according to a first embodiment of the present invention.
  • FIG. 1( a ) is a side view of the brace member and
  • FIG. 1( b ) is a sectional view of a main portion of the brace member viewed sideways.
  • Each of the diagrams is schematically drawn and the dimensions such as the relative size or thickness of each component are not limited to those illustrated in the drawings.
  • the left side is referred to as “a first side in the longitudinal direction” and the right side is referred to as “a second side in the longitudinal direction”.
  • a brace member 100 includes a core member 10 , a buckling restraining member 20 through which the core member 10 extends and that surrounds the core member 10 to restrict out-of-plane deformation of the core member 10 , a cap sleeve 30 in which a first end portion 11 a of the core member 10 on the first side in the longitudinal direction and a first end portion 21 a of the buckling restraining member 20 on the first side in the longitudinal direction are disposed, a cap-sleeve crevice 40 disposed on the cap sleeve 30 so as to protrude toward a side opposite to a side on which the core member 10 and the buckling restraining member 20 are disposed, the cap-sleeve crevice 40 serving as a joint for installing the brace member 100 on an architectural structure (not illustrated), a reinforcing member 50 in which a second end portion 11 b of the core member 10 on the second side in the longitudinal direction is disposed, and
  • the core member 10 is a long member formed from a steel bar having a circular cross section.
  • a male screw thread 12 a is formed at the first end portion 11 a on the first side in the longitudinal direction and a male screw thread 12 b is formed at the second end portion 11 b on the second side in the longitudinal direction.
  • the core member 10 made of a steel bar having a circular cross section is illustrated.
  • the core member 10 is not limited to the one having this cross section and may be formed from, for example, a steel pipe or may be formed by joining flat boards so as to have a cross-shaped cross section.
  • the core member 10 When the core member 10 is made of a plastically deformable material, the core member 10 has a higher effect. In order to prevent noises and an excessive increase in axial force due to friction that occur when the external circumferential surface of the core member 10 and the internal circumferential surface of the buckling restraining member 20 slide over each other, a liner made of a material such as a synthetic resin may be disposed on the external circumferential surface of the core member 10 .
  • the buckling restraining member 20 is a steel pipe having a circular cross section and shorter than the core member 10 .
  • a male screw thread 22 a is formed at the first end portion 21 a on the first side in the longitudinal direction (a male screw thread or the like is not formed at a second end portion 21 b on the second side in the longitudinal direction).
  • the buckling restraining member 20 may have a rectangular cross section.
  • the cap sleeve 30 includes a cylindrical portion 33 low in height.
  • a female screw thread 34 is formed in a first end surface 30 a
  • a female screw thread 32 is formed in a second end surface 30 b
  • a female screw thread 31 is formed through the center of the cylindrical portion 33 .
  • the female screw thread 34 , the female screw thread 32 , and the female screw thread 31 are concentric with one another.
  • the male screw thread 12 a of the core member 10 is screwed on the female screw thread 31 .
  • the male screw thread 22 a of the buckling restraining member 20 is screwed on the female screw thread 32 .
  • a male screw thread 43 (described below) of the cap-sleeve crevice 40 is screwed on the female screw thread 34 .
  • a tapered portion 30 c whose outer diameter decreases toward the second end surface 30 b , is formed in a range of the external circumferential surface near the second end surface 30 b .
  • the corner portion may be chamfered as in the case of the first end surface 30 a.
  • the cap-sleeve crevice 40 serves as a joint for installing the brace member 100 in an architectural structure (not illustrated).
  • the cap-sleeve crevice 40 includes a disk-shaped portion 41 , a plate-shaped portion 42 disposed on the first end surface of the disk-shaped portion 41 , an attachment hole 44 that extends through the plate-shaped portion 42 , and a male screw thread 43 disposed on the external circumferential surface of the disk-shaped portion 41 .
  • the central axis of the attachment hole 44 and the central axis of the disk-shaped portion 41 perpendicularly cross each other (not geometrically accurately but industrially accurately cross each other).
  • the cap sleeve 30 and the cap-sleeve crevice 40 are separately manufactured and are integrated together with screw connection.
  • the present invention is not limited to this configuration.
  • the cap sleeve 30 and the cap-sleeve crevice 40 may be integrated together by mechanical joining such as shrinkage fit or metallurgic joining such as welding.
  • the cap sleeve 30 and the cap-sleeve crevice 40 may be originally manufactured as an integrated unit by, for example, casting.
  • the reinforcing member 50 includes a tubular portion 52 and a disk-shaped portion 55 .
  • a female screw thread 56 is formed in a second end surface 50 b of the disk-shaped portion 55 and a female screw thread 51 is formed through the center of the disk-shaped portion 55 .
  • the male screw thread 12 b of the core member 10 is screwed on the female screw thread 51 and a male screw thread 65 (described below) of the reinforcing-member crevice 60 is screwed on the female screw thread 56 .
  • the inner diameter of the tubular portion 52 is constant in the longitudinal direction.
  • the central axis of the tubular portion 52 , the central axis of the female screw thread 51 , and the central axis of the female screw thread 56 coincide with one another.
  • the tubular portion 52 surrounds the second end portion 21 b (an area extending a predetermined distance from an end surface 20 b ) of the buckling restraining member 20 on the second side in the longitudinal direction (an area of the buckling restraining member 20 extending a predetermined distance from the second end surface 20 b on the second side in the longitudinal direction is inserted into the tubular portion 52 ).
  • a tapered portion 50 c whose outer diameter decreases toward the first end surface (corresponding to the tip end) 50 a on the first side in the longitudinal direction, is formed on the outer surface of the tubular portion 52 .
  • This configuration gives the impression of smoothly reinforcing the buckling restraining member 20 , thereby improving the design.
  • the reinforcing-member crevice 60 serves as a joint for installing the brace member 100 on an architectural structure (not illustrated).
  • the reinforcing-member crevice 60 includes a disk-shaped portion 61 , a plate-shaped portion 62 disposed on the second end surface of the disk-shaped portion 61 , an attachment hole 66 that extends through the plate-shaped portion 62 , and a male screw thread 65 formed on the external circumferential surface of the disk-shaped portion 61 .
  • the center line of the attachment hole 66 and the center line of the male screw thread 65 perpendicularly cross each other (not geometrically accurately but industrially accurately cross each other).
  • the reinforcing-member crevice 60 has the same shape as the cap-sleeve crevice 40 .
  • the reinforcing member 50 and the reinforcing-member crevice 60 are separately manufactured and are integrated together with screw connection.
  • the present invention is not limited to this configuration.
  • the reinforcing member 50 and the reinforcing-member crevice 60 may be integrated together by mechanical joining such as shrinkage fit or metallurgic joining such as welding.
  • the reinforcing member 50 and the reinforcing-member crevice 60 may be originally manufactured as an integrated unit by, for example, casting.
  • the first end portion 21 a of the buckling restraining member 20 on the first side in the longitudinal direction is disposed in the cap sleeve 30 .
  • a predetermined area of the buckling restraining member 20 extending from the second end surface 20 b in the longitudinal direction is surrounded with the tubular portion 52 of the reinforcing member 50 .
  • the tubular portion 52 surrounds the external circumferential surface of the buckling restraining member 20 and the thickness of the tubular portion 52 is not limited.
  • the outer diameter (and the inner diameter) and the thickness can be increased compared with an existing sleeve (disposed in a gap between the core member and the buckling restraining member), whereby the stiffness can be enhanced.
  • a length l k for which the buckling restraining member 20 is surrounded by the tubular portion 52 and a difference e k between the outer diameter of the buckling restraining member 20 (corresponding to a “bucking restraining member”) and the inner diameter of the reinforcing member 50 has a relationship of e k /l k ⁇ 0.05.
  • the outer diameter of the reinforcing member 50 decreases toward the first end surface 50 a (tip end) on the first side in the longitudinal direction (toward the center of the buckling restraining member 20 in the longitudinal direction).
  • the weight reduction can be enhanced and the design can be improved while the strength at each position in the longitudinal direction is secured.
  • Both end portions of the core member 10 are respectively connected with screw threads to the cap sleeve 30 and the reinforcing member 50 .
  • these screw threads in opposite handedness (for example, the male screw thread 12 a and the female screw thread 31 are right-handed screws and the male screw thread 12 b and the female screw thread 51 are left-handed screws)
  • the distance between the attachment hole 44 and the attachment hole 66 can be adjusted, whereby installation of the brace member 100 can be facilitated.
  • FIG. 2 illustrates a specimen that undergoes a loading test to evaluate the performances of the brace member according to the first embodiment of the present invention and is a sectional view viewed sideways to define the length of each component. Some reference signs are not shown. Table 1 shows the dimensions or the like of each portion of the specimens (No. 1 and No. 2).
  • the outer diameter of the core member 10 of each of the specimen No. 1 and the specimen No. 2 is denoted with “D S ”.
  • the yield point of the core member 10 is denoted with “ ⁇ y ”
  • the product of the cross section of the core member 10 and the yield point ⁇ y is denoted with “N y ”.
  • the outer diameter of the buckling restraining member 20 (corresponding to the “buckling restraining member”) is denoted with “D B ”, the thickness of the buckling restraining member 20 is denoted with “t B ”, the distance between the second end surface 20 b of the buckling restraining member 20 on the second side in the longitudinal direction and the center of the attachment hole 66 of the reinforcing-member crevice 60 is denoted with “l c ”, and the distance between the second end surface 20 b of the buckling restraining member 20 on the second side in the longitudinal direction and the first end surface 50 a of the reinforcing member 50 on the first side in the longitudinal direction is denoted with “l k ”.
  • l k has been described above.
  • the distance between the center of the attachment hole 44 of the cap-sleeve crevice 40 and the second end surface 30 b of the cap sleeve 30 is denoted with “FlJ”
  • the distance between the second end surface 30 b of the cap sleeve 30 and the first end surface 50 a of the reinforcing member 50 is denoted with “l B ”
  • the distance between the first end surface 50 a of the reinforcing member 50 and the attachment hole 66 of the reinforcing-member crevice 60 is denoted with “MlJ”.
  • the distance between the center of the attachment hole 44 of the cap-sleeve crevice 40 and the center of the attachment hole 66 of the reinforcing-member crevice 60 is denoted with “l”.
  • e S the difference between the outer diameter of the core member 10 and the inner diameter of the buckling restraining member 20
  • e k the difference between the outer diameter of the buckling restraining member 20 and the inner diameter of the reinforcing member 50
  • the thickness of the reinforcing member 50 at the first end surface 50 a (tip end) on the first side in the longitudinal direction is denoted with “t K ”.
  • FIG. 3 illustrates a specimen that undergoes a loading test to evaluate the performances of an existing brace member of a comparative example and is a sectional view viewed sideways to define the length of each component.
  • Table 2 shows the dimensions or the like of each component of a comparative example (No. 3).
  • the outer diameter of a core member 910 of a comparative example (No. 3) 900 is denoted with “D 5 ”
  • the outer diameter of a buckling restraining member 20 is denoted with “D B ”
  • the thickness of the buckling restraining member 920 is denoted with “t B ”.
  • the yield point of the core member 910 is denoted with “ ⁇ y ”
  • the product of the cross section of the core member 10 and the yield point ⁇ y is denoted with “N y ”.
  • Integrated crevices 940 and 960 are disposed on end portions 911 a and 911 b (at which male screw threads 912 a and 912 b are respectively formed) of the core member 910 .
  • the distance between the center of a connection hole 944 of the first integrated crevice 940 and the center of a connection hole 966 of the second integrated crevice 960 is denoted with “l”.
  • the first end portion 911 a (at which the male screw thread 912 a is formed) of the core member 910 and a first end portion 921 a (at which a female screw thread 922 a is formed) of the buckling restraining member 920 are connected together with a cap sleeve 930 (at which a female screw thread 931 and a male screw thread 932 are formed).
  • a tubular sleeve 970 is disposed at a position near the second end portion 911 b of the core member 910 .
  • the sleeve 970 is inserted into the buckling restraining member 920 by a distance “L” from a second end surface 920 b of the buckling restraining member 920 .
  • the difference between the outer diameter of the sleeve 970 and the inner diameter of a second end portion 921 b of the buckling restraining member 920 is denoted with “e S ”.
  • the geometrical moment of inertia is greater than or equal to “ten millions (mm 4 )”.
  • the geometrical moment of inertia is smaller than or equal to 0.62 millions (mm 4 ).
  • the geometrical moment of inertia of the reinforcing member 50 of aspects of the present invention is approximately 17 times as high (great) as the geometrical moment of inertia of the existing sleeve 970 of a comparative example.
  • the reinforcing member 50 having such high stiffness restricts out-of-plane deformation of the buckling restraining member 20 .
  • FIG. 4 has axial force-axial strain charts showing the results of the loading test conducted to evaluate the performances of the brace member according to the first embodiment of the present invention.
  • FIG. 4( a ) is a chart for a specimen No. 1
  • FIG. 4( b ) is a chart for a specimen No. 2.
  • the loading test is a reversed cyclic loading test in which the core member 10 is repeatedly and alternately compressed and stretched.
  • the core member 10 is compressed by 0.25% (the “distance l” between the center of the attachment hole 44 of the cap-sleeve crevice 40 and the center of the attachment hole 66 of the reinforcing-member crevice 60 is reduced by 6.25 mm).
  • the compressive load and the compressive strain are shown in a first quadrant.
  • the core member 10 is stretched by 0.25% (the distance l is increased by 6.25 mm). At this time, the tensile load and the tensile strain are shown in a third quadrant.
  • the core member 10 is compressed by 0.5% (the distance l is reduced by 12.5 mm) and then the core member 10 is stretched by 0.5% (the distance l is increased by 12.5 mm).
  • the core member 10 is compressed by 1.0% (the distance l is reduced by 25 mm) and then the core member 10 is stretched by 1.0% (the distance l is increased by 25 mm). This loading is regarded as one cycle and this cycle is repeated five times.
  • the core member 10 is compressed by 2.0% (the distance l is reduced by 50 mm) and then the core member 10 is stretched by 2.0% (the distance l is increased by 50 mm).
  • This loading is regarded as one cycle (or referred to as a “final cycle”, below). This cycle is repeated until the core member 10 is buckled or broken.
  • the core member 10 of the specimen No. 1 was broken at the fourth stretch after the final cycle had been repeated three times.
  • the core member 10 of neither the specimen No. 1 nor the specimen No. 2 was buckled. This result reveals that the buckling restraining member 20 and the reinforcing member 50 restrict out-of-plane deformation of the core member 10 .
  • FIG. 5 is an axial force-axial strain chart showing the results of the cyclic loading test conducted to evaluate the performances of an existing brace member of a comparative example.
  • the cyclic loading test is a reversed cyclic loading test in which the core member 10 is repeatedly and alternately compressed and stretched.
  • the core member 910 of the specimen No. 3 was subjected to one cycle of compression and stretch by 0.1%, two cycles of compression and stretch by 0.25%, and two cycles of compression and stretch by 0.5%. Then, when the core member 910 was compressed by 1.0%, the core member 910 was buckled.
  • the brace member of aspects of the present invention has been proved to be a brace member in which the reinforcing member 50 has high (great) bending strength.
  • FIG. 6 illustrates a brace member according to a second embodiment of the present invention.
  • FIG. 6( a ) is a side view of the brace member and
  • FIG. 6( b ) is a sectional view of a main portion of the brace member viewed sideways.
  • Portions the same as or corresponding to the portions of the first embodiment are denoted with the same reference signs and some of them are not described herein.
  • the dimensions such as the relative size or thickness of each component are not limited to those illustrated in the drawings.
  • a brace member 200 includes a core member 10 , a buckling restraining member 20 through which the core member 10 extends and that surrounds the core member 10 to restrict out-of-plane deformation of the core member 10 , a cap sleeve 230 in which a first end portion 11 a of the core member 10 on the first side in the longitudinal direction and a first end portion 21 a of the buckling restraining member 20 on the first side in the longitudinal direction are disposed, a cap-sleeve crevice 40 disposed on the cap sleeve 230 so as to protrude toward a side opposite to a side on which the core member 10 and the buckling restraining member 20 are disposed, the cap-sleeve crevice 40 serving as a joint for installing the brace member 200 on an architectural structure (not illustrated), a reinforcing member 250 in which a second end portion 11 b of the core member 10 on the second side in the longitudinal direction is disposed,
  • the cap sleeve 230 and the reinforcing member 250 of the brace member 200 do not respectively have the tapered portion 30 c and the tapered portion 50 c , which are respectively formed on the outer surface of the cap sleeve 30 and the outer surface of the reinforcing member 50 of the brace member 100 (first embodiment). Except for this point, the brace member 200 is similar to the brace member 100 .
  • the brace member 200 has high (great) bending strength and is manufactured at low costs.
  • the brace member 200 can be manufactured at low costs by performing welding connection between steel pipes or welding connection between a steel pipe and a circular plate (or a disk having a center hole).
  • FIG. 7 illustrates a brace member according to a third embodiment of the present invention.
  • FIG. 7( a ) is a side view of the brace member and
  • FIG. 7( b ) is a sectional view of a main portion of the brace member viewed sideways.
  • Portions the same as or corresponding to the portions of the first embodiment are denoted with the same reference signs and some of them are not described.
  • the dimensions such as the relative size or thickness of each component are not limited to those illustrated in the drawings.
  • a brace member 300 includes a core member 10 , a buckling restraining member 20 through which the core member 10 extends and that surrounds the core member 10 to restrict out-of-plane deformation of the core member 10 , a first-side reinforcing member 350 a in which a first end portion 11 a of the core member 10 on the first side in the longitudinal direction and a first end portion 21 a of the buckling restraining member 20 on the first side in the longitudinal direction are disposed, a reinforcing-member crevice 60 disposed on the first-side reinforcing member 350 a so as to protrude toward a side opposite to a side on which the core member 10 and the buckling restraining member 20 are disposed, the reinforcing-member crevice 60 serving as a joint for installing the brace member 300 on an architectural structure (not illustrated), a second-side reinforcing member 350 b in which a second end portion 11 b of the core member 10 on
  • the brace member 300 includes a first-side reinforcing member 350 a instead of the cap sleeve 30 of the brace member 100 (first embodiment).
  • the first-side reinforcing member 350 a and the second-side reinforcing member 350 b correspond to the reinforcing member 50 .
  • the first end portion 21 a of the buckling restraining member 20 is reinforced with the first-side reinforcing member 350 a , in the same manner as the second end portion 21 b reinforced with the second-side reinforcing member 350 b .
  • the brace member 300 is the same as the brace member 100 .
  • the brace member 300 has high (great) bending strength and is manufactured at low costs.
  • this configuration eliminates the need to manufacture the cap sleeve 30 .
  • the die set for casting the cap sleeve 30 is not needed and the number of types of components constituting the brace member 300 is reduced, whereby stock control is facilitated.
  • the brace member 300 includes a pair of reinforcing members 50 , but may include a pair of reinforcing members 250 instead of the reinforcing members 50 .
  • aspects of the present invention achieve a brace member having a high (great) bending strength with a simple structure.
  • the brace member is also usable for core members having cross-sections of various different shapes.
  • the brace member according to aspects of the present invention is widely usable as a brace member for dealing with various different demands of architectural structures.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
  • Buildings Adapted To Withstand Abnormal External Influences (AREA)
  • Vibration Prevention Devices (AREA)
  • Vibration Dampers (AREA)
US15/310,631 2014-05-19 2015-05-13 Brace member Abandoned US20170081845A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2014103271A JP6204263B2 (ja) 2014-05-19 2014-05-19 ブレース材
JP2014-103271 2014-05-19
PCT/JP2015/002421 WO2015177987A1 (ja) 2014-05-19 2015-05-13 ブレース材

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US (1) US20170081845A1 (ja)
JP (1) JP6204263B2 (ja)
KR (2) KR102025055B1 (ja)
CN (1) CN106414871A (ja)
TW (1) TWI615535B (ja)
WO (1) WO2015177987A1 (ja)

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US20170030701A1 (en) * 2015-07-29 2017-02-02 Corebrace, Llc Displacement measurement systems and methods
US11299901B2 (en) * 2017-02-16 2022-04-12 John Damian Allen Control structure
US11828083B2 (en) 2017-02-16 2023-11-28 John Damian Allen Control structure with rotary force limiter and energy dissipater

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CN105735507B (zh) * 2016-03-10 2018-01-30 苏州科技学院 一种拉压型磁性形状记忆合金多模式智能阻尼器
CN106639027B (zh) * 2017-01-22 2022-04-22 西安交通大学 一种螺纹连接的自应力防屈曲支撑及其装配方法
CN112554361A (zh) * 2020-11-30 2021-03-26 中原工学院 一种装配式可更换的两级防屈曲耗能支撑构件

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JPH0811891B2 (ja) * 1992-09-11 1996-02-07 川鉄建材工業株式会社 二重鋼管型トラス構造物用構造材およびその接合方法
JP3702818B2 (ja) * 2001-07-26 2005-10-05 Ｊｆｅシビル株式会社 二重鋼管型耐震性構造材
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US9045913B2 (en) * 2011-11-25 2015-06-02 Jfe Steel Corporation Brace member
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US20170030701A1 (en) * 2015-07-29 2017-02-02 Corebrace, Llc Displacement measurement systems and methods
US9989349B2 (en) * 2015-07-29 2018-06-05 Corebrace, Llc Displacement measurement systems and methods
US11299901B2 (en) * 2017-02-16 2022-04-12 John Damian Allen Control structure
US11828083B2 (en) 2017-02-16 2023-11-28 John Damian Allen Control structure with rotary force limiter and energy dissipater
US11866956B2 (en) 2017-02-16 2024-01-09 John Damian Allen Force limiter and energy dissipater

Also Published As

Publication number Publication date
CN106414871A (zh) 2017-02-15
KR102025055B1 (ko) 2019-09-24
WO2015177987A1 (ja) 2015-11-26
KR20190026982A (ko) 2019-03-13
KR20170007282A (ko) 2017-01-18
TWI615535B (zh) 2018-02-21
TW201600691A (zh) 2016-01-01
JP2015218498A (ja) 2015-12-07
JP6204263B2 (ja) 2017-09-27

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