JP4823734B2 - Steel column / beam joint structure - Google Patents

Description

  The present invention can improve the structural performance and ensure the ease of construction when joining a plurality of H-shaped steel beams with different beam lengths to a steel pipe column via an outer diaphragm type diaphragm. It also relates to steel column / beam joint structures that can be used.

  As a structure for joining a plurality of H-shaped steel beams to a steel pipe column, a pair of upper and lower diaphragms are arranged on the steel pipe column in the form of an outer diaphragm corresponding to the upper and lower flange positions of the H-shaped steel beam, and the H-shaped steel beam is passed through these diaphragms A steel column / beam joint structure is known in which steel is rigidly joined to a steel pipe column. In this type of column / beam joint structure, as shown in FIG. 6, when H-shaped steel beams a and b having different beams are mixed, for example, on all H-shaped steel beams a and b. The flanges c are joined to the upper diaphragm d with their beam upper ends being flush with each other, and a plurality of lower diaphragms f1, corresponding to the height positions of the lower flanges e1, e2 of the H-shaped steel beams a, b. The lower flanges e1 and e2 of the H-shaped steel beams a and b having different beams are joined to the lower diaphragms f1 and f2, respectively, by arranging f2 on the steel pipe column g. Further, the web i of the H-shaped steel beams a and b was joined to the peripheral side surface of the steel pipe column g through the gusset plate j.

Further, for example, Patent Document 1 is known as a structure of a column / beam joint capable of joining H-shaped steel beams having different beams. In Patent Document 1, a horizontal frame is formed by fixing a horizontal member provided with a nut or a nut fitting to which a joining bolt is screwed from the beam side around a steel column in a band shape. The metal end is provided so that the end face on the pillar side can come into contact with the beam side face of the horizontal frame body, and the end of the joining bolt inserted through the sleeve hardware is screwed into the nut or the like to tighten it, thereby providing a rigidly joined rigid frame structure. It is configured. According to Patent Document 1, it is possible to adjust the height position of the joint with the sleeve hardware relative to the flange position of the steel beam, and it is possible to join steel beams having different beam dimensions to the same horizontal frame. .
JP-A-11-140979

  In the structure in which the lower diaphragms f1 and f2 are individually disposed for the H-shaped steel beams a and b having different beam faults as described above, as shown in FIG. 7A, pulls T and T ′ act on the upper flange c. Even when the compression C, C ′ is applied to the lower flanges e1, e2, during the long-term load, as shown in FIG. 7B, the upper and lower flanges c, e1, Even in the case of a short-term load such as an earthquake where the compression C and C ′ acting on e2 and the tension T and T ′ intersect with the steel pipe column g, the steel pipe column g between the lower diaphragms f1 and f2 is assumed. There was a problem that a stress such as a shearing force Q and a moment M that were not expected or generated was generated. Moreover, as shown in FIG.7 (c), with respect to a pair of left and right H-shaped steel beams a having the same beam, the H-shaped steel having a larger beam than the pair of left and right H-shaped steel beams a from the direction orthogonal thereto. When the beam b is joined to the steel pipe column g via the lower diaphragm f2, when a short-term load is applied, a harmful deformation is caused in the H-shaped steel beam b having a large beam by the same mechanism as that generated in the steel pipe column g. There was also a problem that stress was generated.

  Also, disposing the plurality of lower diaphragms f1 and f2 on the steel pipe column g so as to correspond to the plurality of H-shaped steel beams a and b having different beams causes that the gap between the diaphragms f1 and f2 is not so large. If not, the work of joining the diaphragms f1 and f2 to the steel pipe column g is very complicated or difficult to join.

  In describing the above-described problem, the case where the upper flanges c of the plurality of H-shaped steel beams a and b having different beams are illustrated and explained as an example has been described. The same applies not only when the positions are aligned, but also when the lower flange is aligned instead of the upper flange, and even when neither the upper or lower flange is aligned.

  On the other hand, in Patent Document 1, it is necessary to assemble a nut or the like to the horizontal frame functioning as a diaphragm, the structure is complicated, and the production is complicated, and the horizontal frame is joined to the horizontal frame. It is necessary to attach the sleeve hardware to the steel beam to be used. Furthermore, the work of joining the steel beam to the steel pipe column requires highly accurate alignment between the sleeve hardware and the joint bolt and the nut of the horizontal frame. There was a problem that workability was not good.

  The present invention was devised in view of the above-described conventional problems, and improves the structural performance when joining a plurality of H-shaped steel beams having different beam dimensions to a steel pipe column via an outer diaphragm type diaphragm. An object of the present invention is to provide a steel column / beam joint structure capable of ensuring the ease of construction.

The steel column / beam joint structure according to the present invention comprises a plurality of H-shaped steel beams and steel pipe columns having different beam dimensions, and a pair of upper and lower diaphragms so that the upper ends of these H-shaped steel beams are flush with each other. In order to ensure the same joint strength in both the upper and lower diaphragms , the above-mentioned pair of upper and lower diaphragms is an outer diaphragm type . A thickness dimension of the lower diaphragm is set to be equal to or smaller than a thickness dimension of the upper diaphragm, and a width dimension of the lower diaphragm is set to be equal to or larger than a width dimension of the upper diaphragm, and the lower flanges of the plurality of H-shaped steel beams set to the width capable of bonding, and to set a large thickness to width in the upper diaphragm, set to a small thickness relative to width in the lower diaphragm, said plurality of H-section steel The flange on the, with joining their beam upper end aligned flush to the upper diaphragm, that all lower flange of the plurality of H-shaped steel beam, characterized in that joined to the lower diaphragm.

  The web of the H-shaped steel beam is joined to the outer peripheral surface of the lower diaphragm along the width direction thereof.

  A gusset plate for joining the web of the H-shaped steel beam and the lower diaphragm is provided, and the web of the H-shaped steel beam and the steel pipe column are joined by the gusset plate.

In the steel column / beam joint structure according to the present invention, when joining a plurality of H-shaped steel beams having different beam dimensions to a steel pipe column via an outer diaphragm type diaphragm, strength, rigidity, deformation, etc. The structural performance can be effectively improved, and the ease of construction can be ensured. Specifically, the above-described dimension setting of the upper and lower diaphragms can reduce the amount of steel while ensuring the necessary joint strength and attaching the upper and lower flanges, thereby achieving cost reduction.

Hereinafter, a preferred embodiment of a steel column / beam joint structure according to the present invention will be described in detail with reference to the accompanying drawings. Steel columns and beams Joint part structure according to the present embodiment is basically, as shown in FIGS. 1 and 2, a and tubular columns 3 a plurality of H-section steel beams 1, 2 sei beams are different, they The structure of the steel column / beam joint portion 6 is rigidly joined via a pair of upper and lower diaphragms 4 and 5 so that the upper ends of the H-shaped steel beams 1 and 2 are flush with each other. The pair of diaphragms 4 and 5 is an outer diaphragm type, and in order to ensure the same joint strength in both the upper and lower diaphragms 4 and 5, the thickness dimension T of the lower diaphragm 5 is set to the thickness dimension t of the upper diaphragm 4. In addition to the following, the width dimension H of the lower diaphragm 5 is set to a width dimension that is equal to or larger than the width dimension h of the upper diaphragm 4 and that allows the lower flanges 1a and 2a of the plurality of H-shaped steel beams 1 and 2 to be joined. and, and a thickness dimension with respect to the upper diaphragm 4 in width h The set large, the upper set small thickness T to the width H in the lower diaphragm 5, the upper flange 1b of the plurality of H-shaped steel beams 1, 2, and 2b, and their beam upper end aligned flush In addition to being joined to the diaphragm 4, all the lower flanges 1 a and 2 a of the plurality of H-shaped steel beams 1 and 2 are joined to the lower diaphragm 5.

  FIG. 1 shows a column / beam joint 6 of any one steel pipe column 3. As is well known, the H-shaped steel beams 1 and 2 are constructed by integrating upper and lower flanges 1a, 1b, 2a, and 2b at the upper and lower ends of the webs 1c and 2c. In the present embodiment, a plurality of H-shaped steel beams 1 and 2 having different beams are joined to one steel pipe column 3. These H-shaped steel beams 1 and 2 are disposed so that their upper ends are flush with each other. Therefore, a step is generated between the beam lower ends according to the individual beam faults. As the steel pipe column 3, a square steel pipe is adopted. The steel pipe column 3 may be a hollow cylindrical column or a CFT column filled with concrete.

  The steel pipe column 3 is provided with a pair of upper and lower diaphragms 4 and 5 corresponding to the upper and lower flanges 1a, 1b, 2a and 2b of the H-shaped steel beams 1 and 2, respectively. These diaphragms 4 and 5 are provided in the steel pipe column 3 in the well-known outer diaphragm form. The diaphragms 4 and 5 are made of steel, are formed in an annular shape surrounding the outer periphery of the steel pipe column 3, and are welded to the outer peripheral surface of the steel pipe column 3. When partial penetration welding is performed as a welding method, a welding groove is formed at the upper and lower inner peripheral edges of the annular upper and lower diaphragms 4 and 5, and in the case of a rectangular steel pipe, the welding range is only a flat surface portion of the rectangular steel pipe. Is done. The upper diaphragm 4 is welded to the upper flanges 1b and 2b of the plurality of H-shaped steel beams 1 and 2, and the lower diaphragm 5 is welded to the lower flanges 1a and 2a.

  The diaphragms 4 and 5 have the dimensions T and t projecting laterally from the outer peripheral surface of the steel pipe column 3 as thickness dimensions T and t, and the dimensions along the height direction of the steel pipe column 3 as width dimensions H and h, Regarding these dimensions of the lower diaphragm 5, the thickness dimension T of the lower diaphragm 5 is set to be equal to or less than the thickness dimension t of the upper diaphragm 4, and the width dimension H of the lower diaphragm 5 is greater than or equal to the width dimension h of the upper diaphragm 4. Set to Furthermore, the width dimension H of the lower diaphragm 5 is set to a width dimension that allows the lower flanges 1a and 2a of the plurality of H-shaped steel beams 1 and 2 to be joined. That is, the width dimension H of the lower diaphragm 5 is such that all the lower flanges 1a and 2a of a plurality of H-shaped steel beams 1 and 2 having different beams are collectively joined to the outer peripheral surface along the width direction of the lower diaphragm 5. Therefore, the thickness dimension of the plurality of lower flanges 1a and 2a is set to a dimension that secures a joining margin for joining them to the lower diaphragm 5.

  On the other hand, as for the width dimension h of the upper diaphragm 4, the upper flanges 1 b and 2 b of the plurality of H-shaped steel beams 1 and 2 whose beam upper ends are flush with each other are joined to the outer peripheral surface along the width direction of the upper diaphragm 4. What is necessary is just to set to the dimension which ensured the thickness and the joining margin which joins this to the upper diaphragm 4. Accordingly, the width dimension H of the lower diaphragm 5 is set to be equal to or larger than the width dimension h of the upper diaphragm 4.

The relationship between the width dimension and the thickness dimension in each of the diaphragms 4 and 5 is a joint expressed as the sum of the out-of-plane yield strength nPy of the column flange according to the well-known yield line theory and the yield strength dPy against the tensile / shear stress of the diaphragm. The calculation formula of the partial yield strength Py is applied (see formula (1)). According to the calculation formula of the joint strength Py, as a conclusion, when securing the joint strength of the column / beam joint 6 using the outer diaphragm, the width dimension and the thickness dimension of the diaphragm are considered. However, the width dimension and the thickness dimension are in an inversely proportional relationship. If the width dimension is increased, the thickness dimension is decreased, and if the thickness dimension is increased, the width dimension is decreased. The necessary proof stress can be ensured. That is, as shown in FIG. 2, assuming that the beam is B, the column is C, and the diaphragm is D, the joint strength Py is the yield strength outside the column flange surface nPy according to the yield line theory and the strength R of the diaphragm D on both sides of the column C. It is equal to the sum of the diaphragm yield strength dPy (dPy = 2 × R), which is the sum of (Equation 1).

Py = nPy + dPy (Formula 1)

In this formula 1, it is known that the diaphragm proof strength dPy is much larger than the column flange out-of-plane proof strength nPy and is dominant. As the diaphragm strength dPy, the smaller one of the tensile yield strength dPy1 and the maximum shear strength dPy2 is employed (Formula 2).

dPy = min (dPy1, dPy2) (Formula 2)

  For both the tensile yield strength dPy1 and the maximum shear strength dPy2 of the diaphragm D, the width dimension and the thickness dimension of the diaphragm D are inversely proportional. Therefore, regardless of whether the tensile yield strength dPy1 or the maximum shear strength dPy2 is adopted, the width dimension and the thickness dimension of the diaphragm D have the above-mentioned relationship, and the required joint strength Py is the required diaphragm strength. If dPy can be secured, there is a relationship in which if one of the thickness dimension and the width dimension is set larger, the other can be set smaller.

  According to this relationship, the dimensional relationship between the upper diaphragm 4 and the lower diaphragm 5 according to the present embodiment will be described. When the same joint strength Py is required for both the upper and lower diaphragms 4 and 5, the lower diaphragm as described above. The width dimension H of 5 is equal to or greater than the width dimension h of the upper diaphragm 4. Therefore, with respect to the upper diaphragm 4, the thickness dimension t is set larger than the width dimension h that is set small in order to secure the necessary joint strength Y. On the other hand, in the lower diaphragm 5, the thickness dimension T may be set smaller than the width dimension H set larger. From the above, the thickness dimension T of the lower diaphragm 5 is set to be equal to or less than the thickness dimension t of the upper diaphragm 4 based on the required joint strength Py. From the above, the plurality of H-shaped steel beams 1 and 2 are formed in such a form that the lower flanges 1a and 2a protrude toward the steel pipe column 3 side with respect to the upper flanges 1b and 2b at their beam ends.

  In FIG. 1, the webs 1 c and 2 c of the H-shaped steel beams 1 and 2 are arranged with an appropriate gap such as a cut with respect to the steel pipe column 3 and the upper and lower diaphragms 4 and 5. The steel pipe column 3 is rigidly joined by bolt fastening or welding joining to the welded gusset plate 7.

  The operation of the steel pillar / beam joint structure according to the present embodiment will be described. In construction, the upper diaphragm 4 and the lower diaphragm 5 are joined to the steel pipe pillar 3 in a pair in the upper and lower directions, and the gusset plate 7 is attached. Join. On the other hand, with respect to the plurality of H-shaped steel beams 1 and 2 having different beams, the protrusion amounts of the lower flanges 1a and 2a at the beam end portions are increased in accordance with the thickness dimensions T and t of the upper diaphragm 4 and the lower diaphragm 5. It processes so that it may become larger than the protrusion amount of the flanges 1b and 2b. Next, the H-shaped steel beams 1 and 2 are built in the column / beam joint 6 so that their upper ends are flush with each other. Thereafter, the upper flanges 1 b and 2 b are joined to the upper diaphragm 4, and the lower flanges 1 a and 2 a are joined to the lower diaphragm 5. Further, the webs 1 c and 2 c of the H-shaped steel beams 1 and 2 are joined to the steel pipe column 3 through the gusset plate 7. As a result, the H-shaped steel beams 1 and 2 are rigidly joined to the steel pipe column 3 via the upper and lower diaphragms 4 and 5. At this time, it is preferable that the joining operation is performed in the order of joining the H-shaped steel beam 2 having a large beam in order from the H-shaped steel beam 1 having a small beam.

  In the steel column / beam joint structure according to the present embodiment described above, all the lower flanges 1a of the H-shaped steel beams 1 and 2 are arranged with the upper ends of the beams being flush even if the beams are different. , 2a can be joined to the same lower diaphragm 5 and attached to the steel pipe column 3, so that stresses such as harmful moments and shearing forces generated by external forces input from the lower flanges 1a, 2a having steps up and down can be applied. It is possible to reduce the stress load on the steel pipe column 3 by making the lower diaphragm 5 bear. Moreover, since all the lower flanges 1a and 2a are joined to the single lower diaphragm 5, the rigidity of the lower diaphragm 5 is combined, and among the H-shaped steel beams 1 and 2 that are orthogonal to each other, Detrimental deformation that occurs in the H-shaped steel beam 2 having a large beam can also be reduced.

  In addition, since the lower flanges 1a and 2a of all the H-shaped steel beams 1 and 2 are joined to the single lower diaphragm 5, each of the lower flanges 1a and 2a of the H-shaped steel beams 1 and 2 having different beams Compared with the case where the lower diaphragm is individually provided, the number of welding steps for the steel pipe column 3 can be reduced. In this case, if the gap between the separately arranged lower diaphragms is narrow, the work of joining the lower diaphragm to the steel pipe column is extremely complicated or difficult to join, Such a problem can also be solved. In addition, since the lower flanges 1a and 2a of all the H-shaped steel beams 1 and 2 are joined to the lower diaphragm 5, a plurality of H-shaped steel beams having different beams only by a pair of upper and lower diaphragms 4 and 5 are used. 1 and 2 can be joined to the steel pipe column 3, work man-hours and the number of parts can be reduced, and cost reduction can be achieved.

Further, by increasing the width dimension H of the lower diaphragm 5, it is possible to easily cope with the joining of the lower flanges 1a and 2a of the H-shaped steel beams 1 and 2 of different beams, and a special horizontal frame or There is no need to incorporate a sleeve hardware, and the structure is simple and can be applied easily. Further, the thickness dimension T of the lower diaphragm 5 is set to be equal to or less than the thickness dimension t of the upper diaphragm 4, and the width dimension H of the lower diaphragm 5 is set to be equal to or larger than the width dimension h of the upper diaphragm 4 and a plurality of H The width dimension is set so that the lower flanges 1a and 2a of the steel beams 1 and 2 can be joined , and the upper diaphragm 4 has a thickness dimension t larger than the width dimension h, and the lower diaphragm 5 has a width dimension H with respect to the width dimension H. Since the thickness dimension T is set to be small , the amount of steel can be reduced while securing the necessary joint strength Py and securing the upper and lower flanges 1a, 1b, 2a, 2b, thereby reducing the cost. Can be achieved.

  FIG. 3 shows a first modification of the above embodiment. In the above embodiment, the case where the webs 1c and 2c of the H-shaped steel beams 1 and 2 are joined only to the steel pipe column 3 via the gusset plate 7, the web 2c facing the lower diaphragm 5 is You may make it weld-join W directly to the outer peripheral surface of the steel pipe pillar 3 and the said lower diaphragm 5 along the width direction. Thereby, the web 2c can be appropriately joined to the steel pipe column 3 side without being influenced by the width dimension H of the lower diaphragm 5.

  FIG. 4 shows a second modification of the above embodiment. This second modified example has a structure in which the web 2c is joined to the steel pipe column 3 side without being affected by the width dimension H of the lower diaphragm 5, as in the first modified example. In addition to the gusset plate 7 that joins the web 2c, an additional gusset plate 7a is provided between the web 2c and the lower diaphragm 5, and the web 2c is connected to the lower diaphragm 5 via the additional gusset plate 7a that is welded thereto. Are to be joined. Even in such a modification, the same operational effects as in the first modification can be obtained. In particular, in the second modified example, since the additional gusset plate 7a is used, the construction can be facilitated as compared with the case where the web 2c is directly welded to the lower diaphragm 5.

  FIG. 5 shows a third modification of the above embodiment. The third modification also has the same purpose as the first and second modifications, but when the gusset plate 7a of the second modification for joining the web 2c of the H-shaped steel beam 2 and the lower diaphragm 5 is provided, the gusset The web 2c of the H-shaped steel beam 2 and the steel pipe column 3 are joined by the plate 7a. That is, an integrated gusset plate 7b is formed by integrating the gusset plate 7 for joining the steel pipe column 3 and the web 2c and the additional gusset plate 7a of the second modified example, and this integrated gusset joined to the web 2c. The plate 7b is joined to the outer periphery of the lower diaphragm 5 and the steel pipe column 3, respectively. Even in such a modification, the same effects as the first and second modifications are achieved. In particular, in the third modified example, the shear stress from the web 2c can be smoothly transmitted to the steel pipe column 3 as in the first modified example.

  Even in the modified examples described above, it is a matter of course that the same operational effects as the above-described embodiment can be obtained. In the above-described embodiment, the case of joining the H-shaped steel beams 1 and 2 with two different types of beams is described. However, even when two or more types of H-shaped steel beams with different beams are joined, It can be configured similarly. In the above embodiment, both the upper diaphragm 4 and the lower diaphragm 5 have been described as having the same cross section along the circumferential direction. However, the thickness dimensions T and t are reduced and the width of the portion where the flange is not joined is described. You may set so that the dimension H and h may be enlarged.

It is a perspective view which shows suitable one Embodiment of the steel pillar and beam connection part structure concerning this invention. It is a schematic explanatory drawing for demonstrating the junction strength of the steel pipe column provided with the outer diaphragm. It is a schematic side view which shows the 1st modification of the steel pillar and beam joint part structure concerning this invention. It is a schematic side view which shows the 2nd modification of the steel pillar and beam connection part structure concerning this invention. It is a schematic side view which shows the 3rd modification of the steel pillar and beam connection part structure concerning this invention. It is a side view which shows a prior art example. It is explanatory drawing for demonstrating the subject in a prior art example.

Explanation of symbols

1, 2 H-shaped steel beam 3 Steel pipe column 4 Upper diaphragm 5 Lower diaphragm 6 Steel pillar / beam joint T Thickness of lower diaphragm t Thickness of upper diaphragm H Width of lower diaphragm h Width of upper diaphragm 1a, 2a H-shaped steel beam lower flange 1b, 2b H-shaped steel beam upper flange 1c, 2c H-shaped steel beam web 7, 7a, 7b Gusset plate

Claims (3)

Steel columns / beams made by rigidly joining a plurality of H-shaped steel beams and steel pipe columns with different beams through a pair of upper and lower diaphragms so that the upper ends of these H-shaped steel beams are flush with each other. A mouth structure,
The above pair of upper and lower diaphragms is an outer diaphragm type,
In order to ensure the same joint strength in both the upper and lower diaphragms, the thickness dimension of the lower diaphragm is set to be equal to or less than the thickness dimension of the upper diaphragm, and the width dimension of the lower diaphragm is set to the width of the upper diaphragm. The width dimension is set to a width dimension that can be joined to the lower flanges of the plurality of H-shaped steel beams, and the upper diaphragm is set to have a thickness dimension larger than the width dimension, and the lower diaphragm is set to a width dimension. On the other hand, set the thickness dimension small,
The upper flanges of the plurality of H-shaped steel beams are joined to the upper diaphragm with their upper ends being flush with each other, and all the lower flanges of the plurality of H-shaped steel beams are joined to the lower diaphragm. Steel column / beam joint structure.   The steel column / beam joint structure according to claim 1, wherein the web of the H-shaped steel beam is joined to the outer peripheral surface of the lower diaphragm along the width direction thereof.   The gusset plate for joining the web of the H-shaped steel beam and the lower diaphragm is provided, and the web of the H-shaped steel beam and the steel pipe column are joined by the gusset plate. Steel column / beam joint structure.

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