JP2006328843A - Building member effectively using proof stress of reinforcing steel member product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a building member effectively using the proof stress of reinforcing steel products by approximately simultaneously plasticizing the reinforcing steel products such as reinforcing bars constituting the building member when bending moment due to earthquakes etc. acts on the building member such as a pile, a column, and a beam of a building. <P>SOLUTION: By arranging reinforcing bars of larger strength according to the distances from a neutral axis of a concrete pile, which is reinforced by reinforcing bars, reinforcing steel products, in such a way that stress ratios of reinforcing bars may be equal at the position of the lower surface of a foundation, which is a junction position with the foundation, the reinforcing bars are plasticized approximately at the same period by bending moment acting at the time of earthquakes. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  When a bending moment due to an earthquake or the like is applied to a building member such as a pile, column, or beam of a building, this invention plasticizes the reinforcing steel material such as a reinforcing bar constituting the building member at substantially the same time. It belongs to the technical field of building components that make effective use of proof stress.

  Conventionally, in order to make effective use of the proof strength of reinforcing steel materials such as reinforcing bars that make up building members such as piles, columns, and beams of buildings, it has not been possible to observe the technology to focus on the reinforcing steel materials, and the equal strength Reinforced steel was only installed in equal form.

  For example, as shown in FIG. 18, the reinforcing bars 2 having the same strength are installed in the same form regardless of the distance from the neutral axis T of the pile 1.

  Therefore, when the bending moment M acts on the pile 1 due to an earthquake or the like, a greater distortion is generated in the reinforcing bar 2a far from the neutral axis T of the pile 1 than in the reinforcing bar 2b near the neutral axis T. In other words, even if the reinforcing bar 2a far from the neutral axis T of the pile 1 is plasticized, the reinforcing bar 2b near the neutral axis T is not yet plasticized. That is, the reinforcing bar 2b close to the neutral axis T does not exhibit a sufficient energy absorbing function and does not sufficiently use the proof strength of the reinforcing bar 2b.

Incidentally, when a bending moment due to an earthquake or the like acts on a beam, a technique for preventing a collapse of the beam by forming a wide yield hinge region by yielding the reinforcing bars of the beam almost simultaneously is disclosed in Patent Document 1 below. Yes. However, this is not a technique for effectively utilizing the proof stress of a reinforced steel material.
JP-A-4-118445

  The purpose of the present invention is to increase the strength of building members such as piles, columns, and beams as they move away from the neutral axis of the building member so that the stress ratio of reinforcing steel such as reinforcing bars is substantially equal at the joint position between the building members. In the vicinity of the joint position between the building members, a gap with a predetermined height (length) is formed around the reinforcement steel, and the height (length) of the gap is As the distance from the neutral axis of the building member increases so that the distortion of the reinforcing steel material is approximately equal at the joint position between the building members, the height is set higher (longer) and the reinforcing steel material is substantially the same by the bending moment acting during an earthquake. It is structured to be plasticized at the time, and energy absorption function can be exerted not only on the reinforcing steel material far from the neutral axis of building members but also on the reinforcing steel material near the neutral axis, and the proof stress of the reinforcing steel material can be used effectively , Reinforced steel It is to provide an effective use of the building member strength.

As a means for solving the problems of the prior art, a building member that effectively uses the proof stress of the reinforcing steel material according to the invention described in claim 1 is:
Concrete piles reinforced with reinforcing steel bars are stronger as they are moved away from the neutral axis of the pile so that the stress ratio of the reinforcing bars is approximately equal at the bottom surface of the foundation, which is the position where the foundation is joined. It is characterized in that the reinforcing bar is plasticized at substantially the same time by a bending moment acting during an earthquake or the like.

A building member that effectively utilizes the proof stress of the reinforcing steel material according to the invention described in claim 2,
A pile with multiple steel pipes, which are reinforced steel, has high strength as it moves away from the neutral axis of the pile so that the stress ratio of the steel pipe is approximately equal at the bottom surface position of the foundation, which is the joint position with the foundation. It is characterized in that a steel pipe is arranged and the steel pipe is plasticized substantially at the same time by a bending moment acting during an earthquake or the like.

A building member that effectively utilizes the proof stress of the reinforcing steel material according to the invention described in claim 3 is:
For concrete columns reinforced with reinforcing steel bars, the stress ratio of the reinforcing bars should be approximately equal at at least one of the upper surface position of the lower floor beam and the lower surface position of the upper floor beam, which is the joint position with the beam. As the distance from the neutral axis of the column increases, reinforcing bars with high strength are arranged, and the reinforcing bars are plasticized at substantially the same time by a bending moment acting during an earthquake or the like.

A building member that effectively utilizes the proof stress of the reinforcing steel material according to the invention described in claim 4 is:
A concrete-filled steel pipe column in which steel pipes, which are reinforcing steel materials, are arranged in multiple layers, has a steel pipe stress ratio of approximately at least one of the upper surface position of the lower floor beam and the lower surface position of the upper floor beam, which is the joint position with the beam. The steel pipes having a high strength are arranged so as to be equal to each other so as to be equal to each other, and the steel pipes are plasticized substantially at the same time by a bending moment acting during an earthquake or the like.

A building member that effectively utilizes the proof stress of the reinforcing steel material according to the invention described in claim 5 is:
Concrete beams reinforced with reinforcing steel bars are stronger as they are separated from the beam's neutral axis so that the stress ratio of the reinforcing bars is approximately equal at the outer peripheral surface of the column, which is the joint position with the column. It is characterized by arranging reinforcing bars and plasticizing the reinforcing bars almost simultaneously with a bending moment acting during an earthquake.

A building member that effectively uses the proof stress of the reinforcing steel material according to the invention described in claim 6,
A concrete pile reinforced with reinforcing steel reinforcing bars has a gap with a predetermined height around the reinforcing bars near the bottom surface of the foundation, which is the position where the foundation is joined. The height is set higher as it moves away from the neutral axis of the pile so that the strain of the reinforcing bar is almost equal at the bottom surface position of the foundation, and the reinforcing bar is plasticized at almost the same time by the bending moment acting during an earthquake etc. It is characterized by having a configuration.

A building member that effectively uses the proof stress of the reinforcing steel material according to the invention described in claim 7 is:
A pile with multiple steel pipes, which are reinforcing steel materials, has a gap with a predetermined height around the steel pipe in the vicinity of the bottom surface of the foundation, which is the position where the foundation is joined. The height is set higher as the distance from the neutral axis of the pile is increased so that the strain of the steel pipe is approximately equal at the bottom surface position of the foundation, and the steel pipe is plasticized at approximately the same time by a bending moment that acts during an earthquake, etc. It is characterized by having a configuration.

A building member that effectively utilizes the proof stress of the reinforcing steel material according to the invention described in claim 8 is:
A concrete column reinforced with reinforcing steel bars, which are reinforced steel, has a predetermined height around the reinforcing bars in the vicinity of at least one of the upper surface position of the lower floor beam and the lower surface position of the upper floor beam, which is the joint position with the beam. A gap is formed, and the height of the gap is set at least one of the upper surface position of the lower floor beam and the lower surface position of the upper floor beam so that the distortion of the reinforcing bar is substantially equal. It is characterized in that it is set higher as it moves away from the vertical axis, and the rebar is plasticized at substantially the same time by a bending moment acting during an earthquake or the like.

A building member that effectively uses the proof stress of the reinforcing steel material according to the invention described in claim 9 is:
A concrete-filled steel pipe column in which steel pipes, which are reinforced steel materials, are arranged in multiple locations is arranged around the steel pipe at the vicinity of at least one of the upper surface position of the lower floor beam and the lower surface position of the upper floor beam that is the joint position with the beam. The height of the gap is set so that the strain of the steel pipe is substantially equal at at least one of the upper surface position of the lower floor beam and the lower surface position of the upper floor beam. The structure is such that the steel pipe is plasticized at substantially the same time by a bending moment that acts in the event of an earthquake, etc., as it is set higher as it moves away from the neutral axis of the column.

A building member that effectively uses the proof stress of the reinforcing steel material according to the invention described in claim 10,
A concrete beam reinforced with reinforcing steel bars is a space with a predetermined length around the reinforcing bars in the vicinity of the outer peripheral surface of the column, which is the position where the column is joined. The length is set longer as the distance from the neutral axis of the beam increases so that the distortion of the rebar is approximately equal at the outer peripheral surface of the column, and the rebar is plasticized at approximately the same time by a bending moment acting during an earthquake, etc. It is characterized by having a configuration to make it.

Invention of Claim 11 is the building member which utilized effectively the proof stress of the reinforced steel materials as described in any one of Claims 6-10,
The void portion is filled with a viscoelastic body.

  The building member that effectively uses the proof stress of the reinforcing steel material according to the present invention is a building member such as a pile, a column, or a beam, in which the stress ratio of the reinforcing steel material is substantially equal at the joint position between the building members. As the distance from the vertical axis increases, a reinforcing steel material having a high strength is disposed, or a gap portion of a predetermined height (length) is formed around the reinforcing steel material in the vicinity of the joint position between the building members. Bending moment that acts in the event of an earthquake, etc., is set higher (longer) as the distance (length) increases from the neutral axis of the building member so that the distortion of the reinforcing steel material becomes approximately equal at the joint position between the building members. The reinforcement steel material is plasticized at almost the same time, and the energy absorption function can be exhibited not only in the reinforcement steel material far from the neutral axis of the building member but also in the reinforcement steel material near the neutral axis. Effective use It is possible.

  In particular, the building member that effectively uses the proof stress of the reinforcing steel material according to the inventions described in claims 1 to 5 is such that the strength of the reinforcing steel material near the neutral axis of the building member is greater than the strength of the reinforcing steel material far from the neutral axis. Since it may be small, an inexpensive reinforcing steel material can be adopted as the reinforcing steel material close to the neutral axis of the building member, which can contribute to cost reduction.

  Concrete piles reinforced with reinforcing steel bars are stronger as they are moved away from the neutral axis of the pile so that the stress ratio of the reinforcing bars is approximately equal at the bottom surface of the foundation, which is the position where the foundation is joined. Is arranged, and the reinforcing bars are plasticized at almost the same time by a bending moment acting during an earthquake.

  An embodiment of a building member (hereinafter sometimes simply referred to as a building member) that effectively utilizes the proof stress of the reinforcing member according to the invention described in claim 1 will be described with reference to FIGS. 1 and 2.

Concrete piles 1 is a building element of the present embodiment (hereinafter, simply abbreviated as pile 1.) Is, substantially similar to usual reinforced concrete piles, far rebar from the neutral axis T ₁ arranged following the contour of the pile 1 ( joining position of the reinforcing steel) 2a, and although the reinforced structure between the reinforcing bar 2b close to the neutral axis T _1, foundation beams 3 of reinforced concrete (provided that the base slab may be a customary basis, such as footing.) The neutral axis T ₁ of the pile 1 so that the stress ratio (generated stress / yield stress) of all (but not limited to) the reinforcing bars 2a, 2b is substantially equal at the position of the lower surface 3a of the foundation beam 3. As it leaves, it has a configuration in which reinforcing bars with high strength are arranged. That is, as compared with the reinforcing bar 2b close to the neutral axis T ₁ of the pile 1, the intensity is large rebar adopted far rebar 2a from the neutral axis T _1, allowed to settle each rebar 2a, the upper end portion of 2b to footing beams 3 ing.

As a result, the pile 1 when bending moment acts due to an earthquake, as well as far rebar 2a from the neutral axis T ₁ of the pile 1, by plastically of energy absorption function in substantially the same time also close rebar 2b to the neutral axis T ₁ The proof stress of all the reinforcing bars 2a and 2b can be effectively utilized.

Further, as compared with the far rebar 2a from the neutral axis T ₁ of the pile 1, the reinforcing bar 2b close to the neutral axis T ₁ may be small in strength, it is possible to employ a small inexpensive reinforcing bar of yield strength, cost reduction Can contribute.

  Although the pile 1 of this embodiment is reinforced concrete, it can be similarly applied to steel reinforced concrete.

  Although the foundation beam 3 of this embodiment is also reinforced concrete, it can also be implemented in the same manner with steel-framed reinforced concrete (the same applies to the following Examples 2, 6, and 7).

  Next, a building member that effectively uses the proof stress of the reinforcing steel material according to the invention described in claim 2 will be described with reference to FIGS.

Steel pipe pile 4 a building element of the present embodiment (hereinafter, simply abbreviated as piles 4.) Is a triple steel pipe pile and substantially similarly to customary distant steel from the neutral axis T ₂ that Da設to ground (reinforcement steel) and 5a, a steel pipe 5b close to the neutral axis T _2, but is constituted by a steel pipe 5c disposed therebetween, the lower surface 3a position of the footing beams 3, which is a bonding position of the foundation beam 3, all of the steel tube as stress ratio of 5a~5c are substantially equal, with the distance from the neutral axis T ₂ of the pile 4 has a configuration of arranging the intensity is large steel pipe. That is, steel pipes having high strength are employed in the order of steel pipes 5 a, 5 c, 5 b far from the neutral axis T ₂ of the pile 4, and the upper ends of the steel pipes 5 a to 5 c are fixed to the foundation beam 3.

As a result, the pile 4 is bending moment acts due to an earthquake, as well as far steel 5a from the neutral axis T ₂ of the pile 4, near the steel pipe 5b to the neutral axis T _2, the steel pipe 5c also substantially the same for further disposed therebetween It becomes the structure which can be plasticized at time and can exhibit an energy absorption function, and can use effectively the proof stress of all the steel pipes 5a-5c.

Further, as compared with the far steel pipe 5a from the neutral axis T ₂ of the pile 4, the neutral axis T ₂ near the steel pipe 5b, so may the steel pipe 5c strength is small arranged therebetween, to adopt a less expensive steel pipe yield strength Can contribute to cost reduction.

  Although the pile 4 of a present Example is a triple steel pipe pile, the number of steel pipes is not specifically limited. Moreover, it can implement similarly also with the concrete filling steel pipe pile by which concrete was filled between the steel pipes 5a and 5c, 5c and 5b.

  Next, a building member that effectively uses the proof stress of the reinforcing steel material according to the invention described in claim 3 will be described with reference to FIGS.

Concrete Columns 6 is a building element of the present embodiment (hereinafter, simply abbreviated as pillars 6.) Is substantially the same as the customary reinforced concrete column, farther rebar 7a from the neutral axis T ₃ arranged to follow the contour of the posts 6 If, although the reinforced structure between the reinforcing bar 7b close to the neutral axis T _3, the lower surface 8a positions of the same Kaihari 8 is a joining position between the Kaihari 8 on the reinforced concrete, all (but shall not apply .) rebar 7a, as the stress ratio 7b are substantially equal, with the distance from the neutral axis T ₃ pillars 6 has a configuration of arranging the intensity is large rebar. That is, compared to the reinforcing bar 7 b near the neutral axis T ₃ of the column 6, a reinforcing bar having a higher strength is adopted for the reinforcing bar 7 a far from the neutral axis T _3, and the upper ends of the reinforcing bars 7 a and 7 b are fixed to the upper floor beam 8. The lower end is fixed to the lower floor beam 9.

As a result, when a bending moment due to an earthquake or the like acts on the column 6, not only the reinforcing bar 7 a far from the neutral axis T ₃ of the column 6 but also the reinforcing bar 7 b near the neutral axis T ₃ is plasticized at substantially the same time, thereby absorbing energy. The proof stress of all the reinforcing bars 7a and 7b can be fully utilized effectively.

Further, as compared from the neutral axis T ₃ pillars 6 farther rebar 7a, reinforcing bars 7b close to the neutral axis T ₃ is the strength may be small, it is possible to employ a small inexpensive reinforcing bar of yield strength, cost reduction Can contribute.

  Although the column 6 of this embodiment is reinforced concrete, it can be similarly applied to steel reinforced concrete.

  The upper floor beam 8 and the lower floor beam 9 of this embodiment are also reinforced concrete, but the same can be applied to a steel reinforced concrete structure (hereinafter, Examples 4, 8, and 9 are also the same).

  Next, a building member that effectively uses the proof stress of the reinforcing steel material according to the invention described in claim 4 will be described with reference to FIGS.

Concrete filled steel tube column 10 is a building component according to the present embodiment (hereinafter, simply abbreviated as pillars 10.), As well as the customary concrete-filled steel tube column, and far steel 11a from the neutral axis T ₄ pillars 10, medium a steel tube 11b closer to the vertical spindle T _4, but has a configuration which is reinforced with a steel pipe 11c disposed therebetween, the lower surface 8a positions of the same Kaihari 8 is a joining position with Uekaihari 8, all the steel pipe 11a as stress ratio of ~11c are substantially equal, with the distance from the neutral axis T ₄ pillar 10 has a configuration of arranging the intensity is large steel pipe. Under i.e., farther steel 11a from the neutral axis _{T 4} pillars 10, 11c, employing the intensity is large steel pipe 11b order, to fix the upper end of each of the steel pipe 11a~11c above Kaihari 8, the lower end It is fixed to the floor beam 9.

As a result, posts 10, upon bending moment acts due to an earthquake, as well as far steel 11a from the neutral axis T ₄ pillars 10, near the steel pipe 11b to the neutral axis T _4, steel tube 11c is also substantially the same for further disposed therebetween It becomes the structure which can be plasticized at the time and can exhibit the energy absorption function, and the proof stress of all the steel pipes 11a-11c can fully be utilized effectively.

Further, as compared from the neutral axis T ₄ pillars 10 distant steel pipe 11a, near the steel pipe 11b to the neutral axis T _4, so may the steel pipe 11c intensity small arranged therebetween, to adopt a less expensive steel pipe yield strength Can contribute to cost reduction.

  Next, a building member that effectively uses the proof stress of the reinforcing steel material according to the invention described in claim 5 will be described with reference to FIGS.

Reinforced beam 12 is a building component according to the present embodiment (hereinafter, simply abbreviated as beam 12.) Is usually reinforced concrete beams and substantially similarly to distant reinforcing bars 13a from the neutral axis T ₅ arranged following the contour of the beam 12 If, although the reinforced structure between the reinforcing bar 13b close to the neutral axis T _5, the outer peripheral surface 14a position of the pillar 14, which is a bonding position between the reinforced concrete pillars 14, all (but shall not apply.) rebar 13a, as stress ratio of 13b is substantially equal, with the distance from the neutral axis T ₅ of the beam 12 has a configuration of arranging the intensity is large rebar. That is, as compared with the reinforcing bar 13b close to the neutral axis _{T 5} of the beam 12, the intensity is large rebar adopted far rebar 13a from the neutral axis _{T 5,} the fixing through each rebar 13a, and 13b to the left and right pillars 14, 14 I am letting.

As a result, the beam 12 when bending moment acts due to an earthquake, as well as far rebar 13a from the neutral axis T ₅ of the beam 12, by plastically of energy absorption function in substantially the same time also close rebar 13b to the neutral axis T ₅ The proof stress of all the reinforcing bars 13a and 13b can be fully utilized effectively.

Further, as compared from the neutral axis T ₅ of the beam 12 farther Rebar 13a, rebar 13b close to the neutral axis T ₅ is the strength may be small, it is possible to employ a small inexpensive reinforcing bar of yield strength, cost reduction Can contribute.

  Although the beam 12 of this embodiment is reinforced concrete, it can be similarly applied to steel reinforced concrete.

  Although the column 14 of this embodiment is also reinforced concrete, it can be similarly applied to steel reinforced concrete (hereinafter, the same applies to the embodiment 10).

  Next, a building member that effectively uses the proof stress of the reinforcing steel material according to the invention described in claim 6 will be described with reference to FIGS.

Concrete piles 15 a building element of the present embodiment (hereinafter, simply abbreviated as pile 15.) Is usually reinforced concrete piles and substantially similarly to distant reinforcing bars 16a from the neutral axis T ₆ arranged following the contour of the pile 15 If, and the reinforced structure between the reinforcing bar 16b close to the neutral axis T _6. However, the upper end portion of the far reinforcing bar 16a from the neutral axis T ₆ of pile 15, is fixed after forming the cavity portion 17 having a height L ₁ from the lower surface 3a of a predetermined fundamental beam 3 around, the air gap 17 of the height L _1, the lower surface 3a position of the footing beams 3, all (but shall not apply.) rebar 16a of has a configuration in which distortion of 16b was set to be substantially equal height. That is, as shown in FIG. 13, in the vicinity of the position of the lower surface 3 a of the foundation beam 3 where strain is concentrated, a space 17 is formed around the reinforcing bar 16 a to form a portion where the reinforcing bar 16 a is not restrained by the foundation beam 3. In the unconstrained portion, the elongation of the reinforcing bar 16a is absorbed to reduce the distortion, and the distortion is made equal to the reinforcing bar 16b that originally has a small distortion.

As a result, when a bending moment due to an earthquake or the like acts on the pile 15, not only the reinforcing bar 16 a far from the neutral axis T ₆ of the pile 15 but also the reinforcing bar 16 b near the neutral axis T ₆ is plasticized at substantially the same time, thereby absorbing energy. The proof stress of all the reinforcing bars 16a and 16b can be fully utilized effectively.

  Although the pile 15 of this embodiment is reinforced concrete, it can be similarly applied to steel reinforced concrete.

  Although the gap portion 17 of this embodiment is formed inside the foundation beam 3, it may be formed inside the pile 15. In short, the gap 17 may be formed in the vicinity of the joint position with the foundation beam 3.

  Next, a building member that effectively uses the proof stress of the reinforcing steel material according to the invention described in claim 7 will be described with reference to FIG.

Steel pipe pile 18 architectural member of the present embodiment (hereinafter, simply abbreviated as pile 18.) Is a triple steel pipe pile and substantially similarly to customary distant steel 19a from the neutral axis T ₇ of piles 18 that Da設to ground When, are composed of a steel pipe 19b close to the neutral axis T _7, a steel pipe 19c disposed therebetween. However, the upper end portion of the far steel pipe 19a from the neutral axis T ₇ of pile 18, is fixed after forming the gap portion 20 having a predetermined height L ₂ in the periphery from the lower surface 3a of the foundation beam 3, further wherein the steel pipe 19a the upper end of the steel pipe 19c disposed in the inside, and allowed to settle after forming a gap portion 21 having a predetermined height L ₃ from the lower surface 3a of the foundation beam 3 around. Then, the heights L ₂ and L ₃ of the gaps 20 and 21 are set from the neutral axis T ₇ of the pile 18 so that the strains of all the steel pipes 19 a to 19 c are substantially equal at the position of the lower surface _{3 a} of the foundation beam 3. The higher the setting, the higher the setting. That is, the steel pipe 19a in the case of not forming the gap portion 20 and 21, distortion of 19c are neutral axis becomes larger as the distance from the _{T 7,} the gap portions 20 and 21 of a length that follows the magnitude of the strain Are formed around the steel pipes 19a and 19c, respectively, where the steel pipes 19a and 19c are not restrained by the foundation beam 3, and the elongation of the steel pipes 19a and 19c is absorbed at the unconstrained parts. The strain is made equal and smaller, and the strain is made equal to that of the steel pipe 19b that originally has a small strain.

As a result, the pile 18 is bending moment acts due to an earthquake, as well as far steel 19a from the neutral axis T ₇ of piles 18, rebar 19b close to the neutral axis T _7, the steel pipe 19c also substantially the same for further disposed therebetween It becomes the structure which can be plasticized at time and can exhibit an energy absorption function, and can fully utilize the yield strength of all the steel pipes 19a-19c.

  Next, a building member that effectively uses the proof stress of the reinforcing steel material according to the invention described in claim 8 will be described with reference to FIG.

Concrete Columns 22 is a building component according to the present embodiment (hereinafter, simply abbreviated as column 22.) Is substantially the same as the customary reinforced concrete column, farther rebar 23a from the neutral axis T ₈ arranged following the outline of the pillar 22 If, as a reinforced structure between the reinforcing bar 23b close to the neutral axis T _8, each of the reinforcing bars 23a, the upper portion of 23b is fixed to the upper Kaihari 8, to fix the lower portion under Kaihari (not shown) ing. However, the upper end portion of the far reinforcing bar 23a from the neutral axis T ₈ of column 22, is fixed after forming the gap portion 24 having a predetermined height L ₄ from the lower surface 8a of Uekaihari 8 around, the air gap the height L ₄ of 24, the lower surface 8a position of Uekaihari 8, all (but shall not apply.) rebar 23a, has a configuration that is set to the height distortion and 23b are substantially equal. In other words, in the vicinity of the position of the lower surface 8a of the upper floor beam 8 where the strain concentrates, by forming the gap 24 around the reinforcing bar 23a, a portion where the reinforcing bar 23a is not restrained by the upper floor beam 8 is formed and restrained. The distortion of the reinforcing bar 23a is absorbed at a place where there is no distortion to reduce the distortion, and the distortion is made equal to that of the reinforcing bar 23b which originally has a small distortion.

As a result, when a bending moment due to an earthquake or the like acts on the column 22, not only the reinforcing bar 23 a far from the neutral axis T ₈ of the column 22 but also the reinforcing bar 23 b near the neutral axis T ₈ is plasticized at substantially the same time, thereby absorbing energy. The proof stress of all the reinforcing bars 23a and 23b can be fully utilized effectively.

  Although the column 22 of this embodiment is reinforced concrete, it can be similarly applied to steel reinforced concrete.

  Although the gap portion 24 of this embodiment is formed inside the upper floor beam 8, it may be formed inside the lower floor beam or inside the column 22. In short, the gap 24 may be formed in the vicinity of the joint position with the upper floor beam 8 or the lower floor beam.

  Next, a building member that effectively uses the proof stress of the reinforcing steel material according to the invention described in claim 9 will be described with reference to FIG.

Concrete filled steel tube column 25 is a building element of the present embodiment (hereinafter, simply abbreviated as pillars 25.) Is substantially the same as the customary concrete-filled steel tube column, and far steel 26a from the neutral axis T ₉ pillars 25, and a steel pipe 26b close to the neutral axis T _9, the structure reinforced with a steel pipe 26c disposed therebetween, the upper end portion of each of the steel pipe 26a~26c is fixed to the upper Kaihari 8, the lower the lower end Kaihari ( (Not shown). However, the upper end portion of the far steel pipe 26a from the neutral axis T ₉ pillar 25, is fixed to form a gap portion 27 having a predetermined height L ₅ from the lower surface 8a of Uekaihari 8 around, further the steel pipe 26a of the upper end portion of the steel pipe 26c disposed inwardly, thereby fixing after formation of a space portion 28 having a predetermined height L ₆ from the lower surface 8a of Uekaihari 8 around. Then, the heights L ₅ and L ₆ of the gaps 27 and 28 are set so that the strains of all the steel pipes 26 a to 26 c are substantially equal at the position of the lower surface 8 a of the upper floor beam 8 from the neutral axis T ₉ of the column 25. The higher the setting, the higher the setting. That is, the steel pipe 26a in the case of not forming the gap portion 27, distortion of 26c is neutral axis becomes larger as the distance from _{T 9,} the gap portions 27 and 28 of a length that follows the magnitude of the strain Is formed around the steel pipes 26a and 26c, and the steel pipes 26a and 26c are formed at portions where the steel pipes 26a and 26c are not restrained by the upper floor beam 8, and the elongations of the steel pipes 26a and 26c are absorbed at the unconstrained portions. The strain is made equal and small, and the strain is made equal to that of the steel pipe 26b, which originally has a small strain.

As a result, posts 25, upon bending moment acts due to an earthquake, as well as far steel 26a from the neutral axis T ₉ of post 25, near the steel pipe 26b to the neutral axis T _9, the steel pipe 26c also substantially the same for further disposed therebetween It becomes the structure which can be plasticized at time and can exhibit an energy absorption function, and can fully utilize the yield strength of all the steel pipes 26a-26c.

  Although the gaps 27 and 28 in this embodiment are formed inside the upper floor beam 8, they may be formed inside the lower floor beam. In short, the gaps 27 and 28 may be formed in the vicinity of the joint position with the upper floor beam 8 or the lower floor beam.

  Next, a building member that effectively uses the proof stress of the reinforcing steel material according to the invention described in claim 10 will be described with reference to FIG.

Reinforced concrete beam 29 is a building element of the present embodiment (hereinafter, simply abbreviated as beam 29.) Is substantially the same as the usual reinforced concrete beams 29, farther rebar from the neutral axis T ₁₀ arranged following the contour of the beam 29 and 30a, a reinforced structure between the reinforcing bar 30b close to the neutral axis _{T 10,} are allowed to settle through each rebar 30a, and 30b to the left and right pillars 14 and 14. However, the farther rebar 30a from the neutral axis T ₁₀ of the beam 29, the left side in the periphery (but may be on the right, and further may be on both sides.) Gap portion having a predetermined length L ₇ from the outer peripheral surface 14a of the poles 14 31 is formed and fixed, and the length L ₇ of the gap portion 31 is such that the distortions of all the reinforcing bars 30a and 30b are substantially equal at the position of the outer peripheral surface 14a of the column 14 (but not limited to this). The configuration is set as above. That is, in the vicinity of the position of the outer peripheral surface 14a of the column 14 where distortion is concentrated, by forming the gap portion 31 around the reinforcing bar 30a, a portion where the reinforcing bar 30a is not restrained by the column 14 is formed, and the portion where the reinforcing bar 30a is not restrained. The strain of the reinforcing bar 30a is absorbed to reduce the strain, and the strain is made equal to that of the reinforcing bar 30b having a small strain.

As a result, when a bending moment due to an earthquake or the like acts on the beam 29, not only the reinforcing bar 30 a far from the neutral axis T ₁₀ of the beam 29 but also the reinforcing bar 30 b near the neutral axis T ₁₀ is plasticized at substantially the same time, thereby absorbing energy. The proof stress of all the reinforcing bars 30a and 30b can be fully utilized effectively.

  Although the beam 29 of this embodiment is a reinforced concrete structure, a steel reinforced concrete structure can be similarly implemented.

  Although the gap portion 31 of this embodiment is formed inside the column 14, it may be formed inside the beam 29. In short, the gap 31 may be formed in the vicinity of the joint position with the column 14.

  In addition, although illustration is abbreviate | omitted, even if it is the structure which filled the space | gap part 17 etc. which were formed in the said Example with the viscoelastic body, the effect similar to Examples 6-10 can be anticipated (invention of Claim 11).

  Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments and can be implemented in various forms without departing from the gist of the present invention.

It is a horizontal sectional view of the building member (steel reinforced concrete pile) which used effectively the proof stress of the reinforced steel material of Example 1. It is a longitudinal cross-sectional view of the building member (reinforced concrete pile) which effectively used the proof stress of the reinforced steel material of Example 1. It is a horizontal sectional view of the building member (triple steel pipe pile) which used effectively the proof stress of the reinforced steel material of Example 2. It is a longitudinal cross-sectional view of the building member (triple steel pipe pile) which used effectively the proof stress of the reinforced steel material of Example 2. FIG. It is a horizontal sectional view of the building member (steel reinforced concrete pillar) which used effectively the proof stress of the reinforced steel material of Example 3. It is a longitudinal cross-sectional view of the building member (steel reinforced concrete pillar) which utilized effectively the proof stress of the reinforced steel material of Example 3. It is a horizontal sectional view of the building member (concrete filling steel pipe column) which used effectively the proof stress of the reinforced steel material of Example 4. It is a longitudinal cross-sectional view of the building member (concrete filling steel pipe column) which used effectively the proof stress of the reinforcement steel material of Example 4. FIG. It is a vertical sectional view in the direction orthogonal to the central axis of a building member (reinforced concrete beam) that effectively uses the proof stress of a reinforced steel material of Example 5. It is a longitudinal cross-sectional view of the building member (reinforced concrete beam) which used effectively the proof stress of the reinforced steel material of Example 5. It is a horizontal sectional view of the building member (reinforced concrete pile) which effectively used the proof stress of the reinforced steel material of Example 6. It is a longitudinal cross-sectional view of the building member (reinforced concrete pile) which effectively used the proof stress of the reinforced steel material of Example 6. It is the figure which showed the distortion distribution of the reinforcing bar when the bending moment acted on the pile. It is a longitudinal cross-sectional view of the building member (triple steel pipe pile) which utilized effectively the proof stress of the reinforced steel material of Example 7. It is a longitudinal cross-sectional view of the building member (steel reinforced concrete pillar) which utilized effectively the proof stress of the reinforced steel material of Example 8. It is a longitudinal cross-sectional view of the building member (concrete filling steel pipe column) which used effectively the proof stress of the reinforcement steel material of Example 9. FIG. It is a longitudinal cross-sectional view of the building member (reinforced concrete beam) which used effectively the proof stress of the reinforced steel material of Example 10. FIG. It is the figure which showed the distortion distribution of the reinforcing bar at the time of the bending moment having arisen conventionally in the pile.

Explanation of symbols

1 Reinforced concrete pile 2 Reinforcing bar 2a Reinforcing bar far from the neutral axis of the pile 2b Reinforcing bar close to the neutral axis of the pile T ₁ Neutral axis of the pile 3 Foundation beam 3a Bottom surface of the foundation beam 4 Triple steel pipe pile 5a Steel pipe far from the neutral axis of the pile 5b Steel pipe close to the neutral axis 5c Steel pipe arranged between the steel pipe far from the neutral axis and the steel pipe close to the neutral axis T ₂ Pile neutral axis 6 Reinforced concrete column 7a Reinforcing bar far from the neutral axis 7b Reinforcing bar close to the neutral axis T ₃ columns Neutral shaft 8 Upper beam 8a Lower surface of upper beam 9 Lower beam 9a Upper surface of lower beam 10 Concrete-filled steel pipe column 11a Steel pipe far from neutral axis 11b Steel pipe near column neutral axis 11c From neutral axis of column far steel is close steel and rebar T ₅ beam neutral axis 14 poster near the neutral axis of the far rebar 13b beams from the neutral axis of the neutral axis 12 Concrete beams 13a beams arranged steel pipe T ₄ poster between From the outer circumferential surface 15 reinforced concrete piles 16a piles neutral axis height 18 triple pipe pile 19a piles neutral axis 17 air gap L ₁ gap portion of the reinforcing bar T ₆ piles close to the neutral axis of the far rebar 16b piles from the neutral axis of 4a Column arranged steel tube T ₇ neutral axis 20, 21 the height of the air gap L _{2, L 3} void portion of the pile between the distant steel pipe and close the steel pipe from the neutral axis of the steel pipe 19c piles close to the neutral axis of the distant steel pipe 19b piles 22 Reinforced concrete column 23a Reinforcing bar far from the neutral axis of the column 23b Reinforcing bar close to the neutral axis of the column T Neutral shaft of the ₈ columns 24 Void portion L ₄ Height of the void portion 25 Concrete filled steel pipe column 26a Steel tube far from the neutral axis of the column 26b Column neutral axis 27, 28 air gap L ₅ of the arranged steel tube T ₉ poster between the far steel pipe and close the steel pipe from the neutral axis near the steel pipe 26c column the neutral axis of the, _{L 6} height 29 rebar air gap Neutral axis 31 air gap L ₇ the length of the gap portion of the reinforcing bar T ₁₀ beam close to the neutral axis of the far rebar 30b beams from the neutral axis of the concrete beam 30a Beam

Claims (11)

  Concrete piles reinforced with reinforcing steel bars are stronger as they are moved away from the neutral axis of the pile so that the stress ratio of the reinforcing bars is approximately equal at the bottom surface of the foundation, which is the position where the foundation is joined. A building member that effectively utilizes the strength of reinforcing steel, characterized in that the reinforcing bar is plasticized at approximately the same time by a bending moment acting during an earthquake or the like.   A pile with multiple steel pipes, which are reinforced steel, has high strength as it moves away from the neutral axis of the pile so that the stress ratio of the steel pipe is approximately equal at the bottom surface position of the foundation, which is the joint position with the foundation. A building member that effectively utilizes the strength of a reinforced steel, characterized by arranging steel pipes and plasticizing the steel pipes at approximately the same time by a bending moment acting during an earthquake.   For concrete columns reinforced with reinforcing steel bars, the stress ratio of the reinforcing bars should be approximately equal at at least one of the upper surface position of the lower floor beam and the lower surface position of the upper floor beam, which is the joint position with the beam. The strength of the reinforced steel is characterized by the fact that as the distance from the neutral axis of the column increases, reinforcing bars with high strength are arranged and the reinforcing bars are plasticized almost simultaneously by bending moments acting during earthquakes, etc. Effectively used building materials.   A concrete-filled steel pipe column in which steel pipes, which are reinforcing steel materials, are arranged in multiple layers, has a steel pipe stress ratio of approximately at least one of the upper surface position of the lower floor beam and the lower surface position of the upper floor beam, which is the joint position with the beam. Reinforcement, characterized in that steel pipes with high strength are arranged and plasticized at almost the same time by bending moment acting during earthquakes, etc., as they are separated from the neutral axis of the column so as to be equal Building materials that effectively use the strength of steel.   Concrete beams reinforced with reinforcing steel bars are stronger as they are separated from the beam's neutral axis so that the stress ratio of the reinforcing bars is approximately equal at the outer peripheral surface of the column, which is the joint position with the column. A building member that effectively utilizes the strength of a reinforced steel, characterized by placing the reinforcing bars and plasticizing the reinforcing bars almost simultaneously with a bending moment acting during an earthquake.   A concrete pile reinforced with reinforcing steel reinforcing bars has a gap with a predetermined height around the reinforcing bars near the bottom surface of the foundation, which is the position where the foundation is joined. The height is set higher as it moves away from the neutral axis of the pile so that the strain of the reinforcing bar is almost equal at the bottom surface position of the foundation, and the reinforcing bar is plasticized at almost the same time by the bending moment acting during an earthquake etc. A construction member that effectively utilizes the proof stress of a reinforced steel material, characterized by having a configuration.   A pile with multiple steel pipes, which are reinforcing steel materials, has a gap with a predetermined height around the steel pipe in the vicinity of the bottom surface of the foundation, which is the position where the foundation is joined. The height is set higher as the distance from the neutral axis of the pile is increased so that the strain of the steel pipe is approximately equal at the bottom surface position of the foundation, and the steel pipe is plasticized at approximately the same time by a bending moment that acts during an earthquake, etc. A construction member that effectively utilizes the proof stress of a reinforced steel material, characterized by having a configuration.   A concrete column reinforced with reinforcing steel bars, which are reinforced steel, has a predetermined height around the reinforcing bars in the vicinity of at least one of the upper surface position of the lower floor beam and the lower surface position of the upper floor beam, which is the joint position with the beam. A gap is formed, and the height of the gap is set at least one of the upper surface position of the lower floor beam and the lower surface position of the upper floor beam so that the distortion of the reinforcing bar is substantially equal. A building member that effectively uses the strength of reinforced steel, characterized by the fact that it is set higher as it moves away from the vertical axis, and the rebar is plasticized at approximately the same time by a bending moment that acts during an earthquake.   A concrete-filled steel pipe column in which steel pipes, which are reinforced steel materials, are arranged in multiple locations is arranged around the steel pipe at the vicinity of at least one of the upper surface position of the lower floor beam and the lower surface position of the upper floor beam, which is the joint position with the beam. The height of the gap is set so that the strain of the steel pipe is substantially equal at at least one of the upper surface position of the lower floor beam and the lower surface position of the upper floor beam. A construction that makes effective use of the strength of reinforcing steel, characterized in that the steel pipe is plasticized almost simultaneously with the bending moment acting during earthquakes, etc., as it is set apart from the neutral axis of the column. Element.   A concrete beam reinforced with reinforcing steel bars is a space with a predetermined length around the reinforcing bars in the vicinity of the outer peripheral surface of the column, which is the position where the column is joined. The length is set longer as the distance from the neutral axis of the beam increases so that the distortion of the rebar is approximately equal at the outer peripheral surface of the column, and the rebar is plasticized at approximately the same time by a bending moment acting during an earthquake, etc. A construction member that effectively utilizes the proof stress of a reinforced steel material, characterized in that the structure is made to be made into a structure.   The building member that effectively uses the proof stress of the reinforcing steel material according to any one of claims 6 to 10, wherein the void portion is filled with a viscoelastic body.

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