JP7217622B2 - Reinforcing structure for exposed column bases - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Act Publication date: July 20, 2018 Publication: 2018 Annual Meeting (Tohoku) Summaries of technical papers of academic lectures Summaries of technical papers of architectural design presentations (DVD version)

The present invention relates to a reinforcing structure for exposed column bases.

Conventionally, there has been known a reinforcement structure for an exposed pedestal in which a substantially rectangular base plate is joined to the lower end of the exposed pedestal, and an anchor bolt is inserted through the base plate to fix it to a foundation. In this reinforcement structure for exposed column bases, anchor bolt yielding type, column yielding type, and base plate yielding type have been proposed as yielding modes for coping with earthquakes.

The anchor bolt yielding type is a form in which the base plate is strengthened and the anchor bolts are yielded first, and is excellent in elongation ability. The column yielding type is a form in which the base plate and anchor bolts are strengthened so that the column bears the deformation capacity, and is excellent in seismic energy absorption capacity. The base plate yield type is a form in which the columns and anchor bolts are strengthened to yield the base plate, and it is said to have excellent seismic energy absorption capacity.

However, in the case of the anchor bolt yielding type, there is a problem that it is difficult to secure the seismic energy absorption capacity. In addition, in the case of the column yielding type, it is difficult to reduce costs because it is necessary to install many anchor bolts.In addition, since the rigidity of the base plate and anchor bolts is high, seismic energy concentrates on the bottom end of the column and damages it. There was a problem of fear. Furthermore, although the base plate yielding type is expected to have high seismic energy absorption capacity, it has a problem that it is difficult to use in design from the viewpoint of deformation control because the yielding mechanism (load bearing mechanism) is complicated.

In order to solve such a conventional problem, a first base plate to which the lower end of the exposed pedestal is joined as a base plate and a second base plate extending outward from the first base plate are provided during construction. A joint structure for exposed column bases has been proposed (Patent Document 1). According to this proposal, in advance, the yield strength of the first base plate and the second base plate, the yield of the first anchor bolt that secures the first base plate, and the yield of the second anchor bolt that secures the second base plate By setting the strength to a specific relationship, the seismic energy is absorbed.

Japanese Patent No. 6140209

Patent Literature 1 is excellent in that it is possible to suppress costs while ensuring an excellent ability to absorb seismic energy with the above configuration. However, in the proposal of Patent Document 1, it is necessary to set the yield strength conditions of the first and second base plates and the yield strength conditions of the first and second anchor bolts in advance at the architectural design stage. There is room for improvement in that it cannot be applied to exposed column bases.

The present invention has been made in view of the above circumstances, and can be applied to existing exposed column bases, and can reduce costs while ensuring excellent seismic energy absorption capacity. It is an object of the present invention to provide a reinforcing structure for an exposed column base.

The present invention has been made to solve the above technical problems, and has the following features.

First, a reinforcing structure for an exposed pedestal in which an existing anchor bolt is inserted near the outer edge of an existing base plate joined to the lower end of the existing exposed pedestal and fixed to the foundation,
It consists of a reinforcing base plate joined to the outer edge of the existing base plate, and a reinforcing anchor bolt inserted through the outer peripheral portion of the reinforcing base plate,
The reinforcing base plate has a lower yield strength than the existing base plate,
The reinforcing anchor bolt has a higher yield strength than the existing anchor bolt,
When an earthquake occurs, the reinforcing base plate is elastically or plastically deformed, and the existing base plate and the reinforcing anchor bolts are not relatively plastically deformed.
Secondly, in the reinforcing structure for the exposed column base of the first invention, the existing base plate has a substantially rectangular shape, and the reinforcing base plate has two sides adjacent to each corner with respect to the four corners of the existing base plate. It is preferable that they are joined so as to be in contact with each other.
Third, in the reinforcing structure for the exposed column base of the first invention, the existing base plate is substantially rectangular, and the reinforcing base plate is in contact with three sides of the existing base plate and is joined so as to face and sandwich it. preferably.
Fourthly, in the reinforcing structure for the exposed column base of any one of the first to third inventions, it is preferable that the existing base plate has a substantially rectangular shape, and that notches are formed at the four corners thereof.
Fifth, in the reinforcing structure for the exposed column base of any one of the first to fourth inventions, it is preferable that the reinforcing base plate has a yield strength of 15 to 300 N/mm ² .
Sixthly, in the reinforcing structure for the exposed column base of any one of the first to fifth inventions, it is preferable that the reinforcing anchor bolt has a yield strength of 15 to 400 N/mm ² .

INDUSTRIAL APPLICABILITY According to the reinforcing structure for exposed column bases of the present invention, it is possible to apply the structure to existing exposed column bases, and it is possible to reduce costs while ensuring excellent seismic energy absorption capacity.

1 is a cross-sectional view illustrating an embodiment of a reinforcement structure for an exposed column base according to the present invention; FIG. FIG. 4 is a top view showing a state in which a reinforcing base plate is joined to an existing base plate in the reinforcing structure for exposed column bases of the present invention, where (A) is a four-division embodiment and (B) is a two-division embodiment. It is a top view which shows embodiment which each of the reinforcement baseplates butted, (A) is embodiment of 4 division|segmentation, (B) is embodiment of 2 division|segmentation. It is a top view which shows the variation of a reinforcement baseplate, (A) is a variation of division into 4, (B) is a variation of division into 2. FIG. FIG. 11 is a top view of an embodiment in which a reinforcing baseplate is provided with a yielding hinge line and an elastoplastic region; 6A and 6B are partial cross-sectional views showing variations in the form of the base plate on the AA cross section of FIG. 5; The shaded area in the figure indicates the elastoplastic region of the reinforcing base plate. (A), (B), and (C) are front views illustrating embodiments of anchor bolts in the reinforcement structure for the exposed pedestal of the present invention. FIG. 11 is a top view showing variations in the joining state of the reinforcing base plate to the existing base plate; FIG. 11 is a top view showing an embodiment in which an existing base plate is provided with ribs; FIG. 4 is a cross-sectional view illustrating a yielding state when an earthquake occurs in the reinforcement structure for exposed column bases of the present invention.

One embodiment of the reinforcing structure for exposed column bases of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view illustrating one embodiment of the reinforcing structure for exposed column bases of the present invention, and FIG. 2 is a top view showing a state in which a reinforcing base plate is joined to an existing base plate.

The reinforcing structure of the exposed pedestal of the present invention is an exposed pedestal fixed to the foundation 4 by inserting the existing anchor bolt 5 near the outer edge of the existing base plate 2 joined to the lower end of the existing exposed pedestal 1. It is a reinforcing structure, in which a reinforcing base plate 3 is joined to the outside of the existing base plate 2 and is further fixed with reinforcing anchor bolts 6. - 特許庁

Normally, an existing base plate 2 is joined to the lower end of an existing exposed steel frame pedestal 1 . As shown in FIGS. 2A and 2B, the general existing base plate 2 has a substantially rectangular planar contour, and a joint S is formed in the center thereof to which the lower end of the exposed column base 1 is joined. It is Further, in the vicinity of the outer edge of the existing base plate 2, existing anchor bolt insertion holes 2a for inserting a plurality of existing anchor bolts 5 protruding above the foundation 4 are vertically formed through the base plate 2. As shown in FIG.

Then, the existing base plate 2 is fixed on the foundation 4 by inserting a plurality of existing anchor bolts 5 arranged on the concrete foundation 4 and protruding at the upper ends thereof through the existing anchor bolt insertion holes 2a and tightening them with nuts. and an exposed column base 1 is installed. At this time, mortar 4a can be interposed between the lower surface of the existing base plate 2 and the upper surface of the foundation 4. As shown in FIG.

In the reinforcing structure of the exposed column base of the present invention, the reinforcing base plate 3 is firmly joined to the outside of the existing base plate 2 so as to surround the existing plate. The reinforcing base plate 3 extends outward from the outer edge of the existing base plate 2 so that the outer peripheral portion is exposed. Reinforcing anchor bolt insertion holes 3a for inserting a plurality of reinforcing anchor bolts 6 protruding above the foundation 4 are vertically formed through the four corners of the outer peripheral portion of the reinforcing base plate 3 .

A plurality of reinforcing anchor bolts 6 with their upper ends protruding are inserted through the reinforcing anchor bolt insertion holes 3a and fastened with nuts to the concrete foundation 4. As shown in FIG. In this state, the reinforcing base plate 3 is joined to the outer edge of the existing base plate 2, and the joining of the reinforcing base plate 3 to the existing base plate 2 is performed by welding together while the reinforcing base plate 3 is in contact with the existing base plate 2. be. The reinforcing anchor bolts 6 may be installed after the reinforcing base plate 3 is joined to the existing base plate 2 by welding.

As for the shape of the reinforcing base plate 3 , a four-divided shape and a two-divided shape can be exemplified as forms in which the reinforcing base plate 3 is joined along the outer edge of the existing base plate 2 .

As a four-division embodiment, the reinforcing base plate 3 is joined so as to include the four corners of the existing base plate 2 and contact two adjacent sides. Specifically, as shown in FIG. 2(A), one sheet is provided at each of the four corners of the existing rectangular base plate 2 .

The dimensions of the reinforcing base plate 3 when divided into four parts can be appropriately determined according to the size of the existing base plate 2, etc. However, as a guideline for design, the dimensions are set as shown in FIG. 2(A), for example. be able to. Assuming that one side of the existing base plate 2 is B and the width from the exposed pedestal 1 is b, the dimension a of the reinforcing base plate 3 in contact with one side of the existing base plate 2 has a relationship of B/2≤a<B/2. This makes it possible to absorb the energy of an earthquake.

As an embodiment divided into two, the reinforcing base plate 3 is joined so as to be in contact with the three sides of the outer periphery of the existing base plate 2 and face each other. Specifically, as shown in FIG. 2(B), the reinforcing base plate 3 is formed in a substantially U-shape that closely contacts the outer circumference of the existing base plate 2, and is composed of two plates sandwiched between them facing each other.

In addition, in the reinforcing structure of the exposed column base of this embodiment, the reinforcing base plates 3 divided into four parts as shown in FIG. They can also be joined by contacting each other. In this case, it is preferable to provide a non-joint portion 7 at a portion of the joint portion between the reinforcing base plates 3 . As a result, defective welding can be prevented.

In addition, in the reinforcing structure of the exposed column base of this embodiment, as shown in FIG. A reinforcing base plate 3 can also be joined.

In this specification, in the embodiment in which the notch 2b is provided at the corner of the existing base plate 2, the notch 2b is not one side, but the corner including the notch 2b and two or three sides sandwiching the corner. The reinforcing base plate 3 shall be joined to.

In addition, in the reinforcing structure of the exposed column base of the present invention, a plurality of reinforcing anchor bolt insertion holes 3a are provided at the corners of one reinforcing base plate 3, and reinforcing anchor bolts 6 are arranged at positions corresponding to these holes. You can also fix it by

Various forms can be used as the reinforcing base plate 3, and specifically, the variations shown in FIG. 4 can be mentioned. (a) to (h) of FIG. 4(A) show four-division variations, and (a) to (h) of FIG. 4(B) show two-division variations. Also, in both FIGS. 4A and 4B, (a) to (d) are variations that are joined to the existing rectangular base plate 2, and (e) to (h) are variations in which a notch 2b is provided at the corner. This is a variation of bonding to the existing base plate 2 . In addition, (c), (d), (g), and (h) are variations in which a non-joint portion 7 is provided to join the reinforcing base plates 3 together, and (b), (d), (f), and (h) are variations in which two This is a variation in which two reinforcing anchor bolt insertion holes 3a are provided.

In the reinforcing structure of the exposed column base of the present invention, the reinforcing base plate 3 joined to the existing base plate 2 is designed to have a lower yield strength than the existing base plate 2 so that the reinforcing base plate 3 is elastically or plastically deformed when an earthquake occurs. ing. As a result, the reinforcing base plate 3 is relatively plastically deformed to absorb seismic energy.

The yield strength of the reinforcing base plate 3 under the above conditions is appropriately set depending on the scale of an assumed earthquake, the structure of the building, etc., but as a rough standard, it is preferably 15 to 300 N/mm ² . Moreover, the difference in yield strength between the existing base plate 2 and the reinforcing base plate 3 is preferably about 20 to 100 N/mm ² .

The method of adjusting the yield strength of the reinforcing base plate 3 with respect to the existing base plate 2 is not particularly limited. 2, or when the reinforcing base plate 3 and the existing base plate 2 have approximately the same thickness, a method of using a material having a lower yield strength for the reinforcing base plate 3 than for the existing base plate 2 can be exemplified. .

Furthermore, at the four corners of the existing base plate 2, as shown in FIG. A region surrounded by the hinge line 3b can be an elastic-plastic region 3c. The elasto-plastic region 3c is a portion of the reinforcing base plate 3 in which the yield strength is partially reduced, and is formed for forced elastic or plastic deformation across the yield hinge line 3b.

As a specific form of the elasto-plastic region 3c, as illustrated in FIGS. 6(a) to 6(f), various cross-sectional shapes thinner than the thickness of the existing base plate 2 can be used. 6(a) to (f) are partial cross-sectional views of the AA cross section in FIG. 5, and the shaded areas in FIGS. showing.

In the form illustrated in FIG. 6(a), a reinforcing base plate 3 thinner than the existing base plate 2 having the same shape as the base plate illustrated in FIG. An elastic-plastic region 3c is formed as a line. In the form illustrated in FIG. 6B, a thin reinforcing base plate 3 is joined flush with the existing base plate 2 . In the form illustrated in FIG. 6(c), concave portions are formed on the front and back surfaces of the reinforcing base plate 3, and an elastoplastic region 3c having a thin central portion is formed. In the embodiment of FIGS. 6(a) to 6(c), the material of the hatched portion which is the elastoplastic region 3c in the reinforcing base plate 3 can be made of a material having a lower yield strength than the material of the other portions.

In addition, in the form illustrated in FIG. 6D, the existing base plate 2 and the vicinity of the reinforcing base plate 3 through which the reinforcing anchor bolts 6 are inserted are formed to have substantially the same thickness. The recess is formed as a thin elastoplastic region 3c. In the embodiment illustrated in FIG. 6(e), the existing base plate 2 and the vicinity of the reinforcing base plate 3 through which the reinforcing anchor bolts 6 are inserted are formed to have substantially the same thickness, and a concave portion is formed on the back surface of the reinforcing base plate 3. A thin reinforcing base plate 3 is joined flush with the existing base plate 2 . In the form illustrated in FIG. 6( f ), the existing base plate 2 and the vicinity of the reinforcing base plate 3 through which the reinforcing anchor bolts 6 are inserted are formed to have substantially the same thickness, and concave portions are formed on the front and back surfaces of the reinforcing base plate 3 . and is formed as a thin elastoplastic region 3c. By providing the yielding hinge line 3b and the elasto-plastic region 3c in the above configuration for the reinforcing base plate 3, the amount of seismic energy absorbed by the yielding of the reinforcing base plate 3 can be partially increased.

In addition, in the reinforcing structure of the exposed column base of the present invention, the reinforcing anchor bolts 6 have a higher yield strength than the existing anchor bolts 5, so that the existing base plate 2 and the reinforcing anchor bolts 6 are not plastically deformed when an earthquake occurs. Designed. The yield strength of the reinforcing anchor bolts 6 under the above conditions is appropriately set according to the scale of the assumed earthquake, the structure of the building, etc., but is preferably 15 to 400 N/mm ² , for example. Moreover, the difference in yield strength between the existing anchor bolts 5 and the reinforcing anchor bolts 6 is preferably about 20 to 100 N/mm ² .

Since the reinforcing anchor bolts 6 have a higher yield strength than the existing anchor bolts 5 as described above, the existing anchor bolts 5 inserted near the outer edge of the existing base plate 2 are relatively prone to plastic deformation.

Although the form of the reinforcing anchor bolt 6 is not particularly limited, for example, forms such as those shown in FIGS. 7A, 7B, and 7C can be adopted. The reinforcing anchor bolt 6 illustrated in FIG. 7A has a fixing plate screwed to the lower portion embedded in the foundation 4, and a nut 6a can be screwed to the upper portion protruding from the foundation 4. there is Moreover, when fastening a nut to the reinforcing base plate 3, a washer 6b can be interposed. The reinforcing anchor bolt 6 illustrated in FIG. 7(B) has a substantially J-shaped bent lower portion embedded in the foundation 4 . Furthermore, the reinforcing anchor bolt 6 illustrated in FIG. 7(C) is a deformed reinforcing bar combined type. The deformed reinforcing bar combined type uses both the deformed reinforcing bar as the main reinforcing bar of the foundation 4 of the exposed column base 1 and the reinforcing anchor bolt 6, and is excellent in workability while being able to suppress the cost.

In addition, in the reinforcing structure of the exposed column base of the present invention, a plurality of reinforcing anchor bolt insertion holes 3a are provided at the corners of one reinforcing base plate 3, and reinforcing anchor bolts 6 are arranged at positions corresponding to these holes. You can also fix it by The yield strength of the reinforcing anchor bolts 6 can be set to a desired yield strength by adjusting the thickness (diameter) and the number of the reinforcing anchor bolts 6, for example.

FIG. 8 is a top view illustrating a variation of an embodiment of the existing base plate 2, the reinforcing base plate 3, and the reinforcing anchor bolts 6 in the reinforcing structure for the exposed column base of the present invention. In addition, in FIG. 8, the reference numerals of the parts common to the forms illustrated in FIGS. 1, 2, and 4 are omitted.

The embodiment illustrated in FIGS. 8A to 8H is an embodiment using a four-divided reinforcing base plate 3, and the embodiment illustrated in FIGS. It is an embodiment using

In the embodiment of the four-part reinforcing base plate 3 illustrated in FIGS. 8A to 8H, FIGS. 8(C), (D), (G), and (H) are embodiments in which adjacent reinforcing base plates 3 are joined together, and FIGS. 8(B), (D), (F), and (H) are In this embodiment, two (eight in total) reinforcing anchor bolt insertion holes 3a are provided at the four corners of the reinforcing base plate 3, respectively.

In the embodiment of the reinforcing base plate 3 divided into two shown in FIGS. 8(I) to (P), FIGS. 8(K), (L), (O), and (P) are embodiments in which the reinforcing base plates 3 facing each other are joined, and FIGS. 8(J), (L), (N), and (P) are In this embodiment, two reinforcing anchor bolt insertion holes 3a (eight in total) are provided at each of the four corners of the reinforcing base plate 3. FIG.

8(A) to 8(P), a rib plate 8 as shown in FIG. 9 can be provided so as to surround the anchor bolt insertion holes of the existing base plate 2. As shown in FIG. By providing the rib plate 8, it is possible to increase the yield strength and rigidity of the existing base plate 2 and to produce a relative yield strength difference between the existing base plate 2 and the reinforcing base plate 3, so that the reinforcing base plate is superior to the existing base plate 2. The yield strength of 3 can be adjusted relatively low.

As a construction method of the reinforcing structure of the exposed column base of the present invention, for example, when the reinforcing base plate 3 illustrated in FIG. Reinforcement anchor bolts 6 are arranged so as to protrude from the position of the foundation 4, and the reinforcement base plate 3 is arranged so that the reinforcement anchor bolts 6 are inserted into the reinforcement anchor bolt insertion holes 3a. Then, the existing base plate 2 joined to the exposed column base 1 and the reinforcing base plate 3 are joined by welding, and the reinforcing base plate 3 and the reinforcing anchor bolts 6 are fixed with nuts. The exposed column base 1 installed on the foundation 4 in this manner is reinforced by joining the existing base plate 2 and the reinforcing base plate 3 .

FIG. 10 is a cross-sectional view illustrating the yielding state when an earthquake occurs in the reinforcement structure for the exposed column base of the present invention. The existing base plate 2 and the reinforcing base plate 3 exemplify the forms illustrated in FIGS. 1 and 2 .

In the reinforcing structure of the exposed column base of the present invention, the reinforcing base plate 3 has a relatively low yield strength compared to the existing base plate 2, and the reinforcing anchor bolt 6 has a relatively low yield strength compared to the existing anchor bolt 5. is designed to be high. Therefore, when the force of an earthquake is applied, the reinforcing base plate 3 and the existing anchor bolts 5 on the pulling side undergo elasto-plastic deformation and can effectively absorb the seismic energy. Therefore, when an earthquake of an assumed scale occurs, the reinforcing base plate 3 and the existing anchor bolts 5 on the tensile side yield.

In this way, the reinforcing structure for exposed column bases of the present invention can reduce costs by reducing the number of anchor bolts while ensuring an excellent ability to absorb seismic energy. Furthermore, it becomes possible to evaluate the safety as the elastic deformation of the exposed column base 1 by evaluating the elastic deformation based on the anchor bolt yield type evaluation. This makes it possible to incorporate elements of the base plate yielding type into the implementation design, and the high seismic energy absorption capacity of the base plate yielding type can be effectively applied to the exposed column base 1 with the existing base plate 2 while suppressing the cost. can be utilized.

Further, in the reinforcing structure of the exposed pedestal of the present invention, the distance between the reinforced base plate 3 and the reinforcing anchor bolt 6 with respect to the exposed pedestal 1 can be taken into consideration.

Specifically, as illustrated in FIGS. 1 and 2 , for example, when the exposed column base 1 is a square steel pipe column (200×200 mm to 550×550 mm), the exposed column base 1 from the outer end of the reinforcing base plate 3 It is preferable that the distance b2 to the center L is 30 to 60 cm. Further, the distance a2 from the reinforcing anchor bolt 6 to the center L of the exposed column base 1 is preferably 25 to 50 cm.

Since the existing anchor bolts 5 are close to the exposed pedestal 1, the existing base plate 2 is not plasticized, and the reinforcing base plate 3 is plasticized. It is easily affected by and becomes easy to plasticize.

Since the reinforcing anchor bolts 6 are far from the exposed pedestal 1, the existing anchor bolts 5 are plasticized and the reinforcing base plate 3 is plasticized, so that the reinforcing anchor bolts 6 are prevented from moving when the exposed pedestal 1 rotates. It becomes less susceptible to influence and less likely to become plastic.

Since the existing base plate 2 is close to the exposed column base 1, the existing anchor bolts 5 are plasticized and the reinforcing base plate 3 is plasticized. It is easy to receive, but the distance from the exposed column base 1 is short, and the thickness is usually thick, so it is difficult to deform and difficult to plasticize.

Since the reinforcing base plate 3 is far from the exposed pedestal 1, the existing anchor bolt 5 is plasticized, the existing base plate 2 is not plasticized, and the reinforcing anchor bolt 6 is not plasticized, so that the exposed pedestal 1 rotates. Although it is hard to be affected by the operation, it is easy to be plasticized because the distance from the exposed column base 1 is long and the thickness is usually thin.

As described above, in the reinforcing structure of the exposed column base of the present invention, when an earthquake force is applied, the tension-side reinforcing base plate 3 and the existing anchor bolts 5 are likely to undergo elastic-plastic deformation, effectively absorbing the seismic energy. can. Therefore, when an earthquake of an assumed scale occurs, the reinforcing base plate 3 and the existing anchor bolts 5 on the tensile side yield.

In this way, the reinforcing structure of the exposed column base of the present invention has the problem of the column yielding type that it is difficult to suppress the cost, and the problem of the anchor bolt yielding type that it is difficult to secure the seismic energy absorption capacity. The problem of the base plate yielding type is solved, which is that the mechanism is complicated and the evaluation of elastic deformation is particularly difficult.

Although the reinforcing structure of the exposed column base of the present invention has been described above based on the embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention. be. For example, known anchor bolts can be used as reinforcing anchor bolts, and the number and arrangement thereof can be appropriately designed. Also, the yield strength of the reinforcing base plate and the yield strength of the reinforcing anchor bolts can be appropriately designed according to the scale of an anticipated earthquake, the structure of the building, and the like.

1 Exposed column base 2 Existing base plate 2a Existing anchor bolt insertion hole 2b Notch 3 Reinforcement base plate 3a Reinforcement anchor bolt insertion hole 3b Yield hinge line 3c Elastic-plastic region 4 Foundation 4a Mortar 5 Existing anchor bolt 6 Reinforcement anchor bolt 7 Non-joint portion 8 rib plate

Claims (6)

A reinforcing structure for an exposed pedestal in which an existing anchor bolt is inserted near the outer edge of an existing base plate joined to the lower end of the existing exposed pedestal and fixed to the foundation,
It consists of a reinforcing base plate joined to the outer edge of the existing base plate, and a reinforcing anchor bolt inserted through the outer peripheral portion of the reinforcing base plate,
The reinforcing base plate has a lower yield strength than the existing base plate,
The reinforcing anchor bolt has a higher yield strength than the existing anchor bolt,
A reinforcing structure for an exposed column base, wherein the reinforcing base plate is elastically or plastically deformed when an earthquake occurs, and the existing base plate and the reinforcing anchor bolts are not relatively plastically deformed. The reinforcing structure of the exposed column base according to claim 1, wherein the existing base plate has a substantially rectangular shape, and the reinforcing base plate is joined so as to include four corners of the existing base plate and contact two adjacent sides. 2. The reinforcing structure of the exposed column base according to claim 1, wherein the existing base plate is substantially rectangular, and the reinforcing base plate is joined so as to be in contact with the three sides of the existing base plate and sandwich the existing base plate so as to face each other. 4. The reinforcement structure for the exposed column base according to any one of claims 1 to 3, wherein the existing base plate has a substantially rectangular shape and is formed with notches at four corners thereof. The reinforcing structure for an exposed column base according to any one of claims 1 to 4, wherein the reinforcing base plate has a yield strength of 15 to 300 N/mm ² . The reinforcing structure for an exposed column base according to any one of claims 1 to 5, wherein the reinforcing anchor bolt has a yield strength of 15 to 400 N/mm ² .

Images