Building

Abstract

To provide a building 100 having a composite structural beam 2 excellent in bending rigidity despite using a woody material.SOLUTION: A building 100 according to the invention is the building 100 having a frame structure 110. The frame structure 110 has a pair of steel columns 1, 1 and a composite structural beam 2 extending from the pair of columns 1, 1. The composite structural beam 2 comprises: a first beam end member 10 and a second beam end member 20 that are steels and rigidly connected to the pair of columns 1, 1; and a beam intermediate member 30 that is a woody material sandwiched between the first beam end member 10 and the second beam end member 20.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to buildings comprising composite structural beams. [Background technology]

[0002] The revision of the Building Standards Act in 2000 made it possible to construct fire-resistant wooden buildings by ensuring certain performance standards. In recent years, there has been active movement in both the public and private sectors to promote demand for wooden buildings, leading to the standardization of wooden structural materials and revisions to the Building Standards Act.

[0003] For example, Patent Document 1, entitled "Construction Material Connection Structure," proposes a structure for connecting steel pillars and wooden beams (see Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-68081 Summary of the Invention [Problem to be solved by the invention]

[0005] However, all-wood beams generally have low bending rigidity, and tend to deform significantly under long-term loads, for example, in large-span buildings or buildings of medium or larger heights.

[0006] Therefore, an object of the present invention is to provide a building equipped with a composite structural beam that is made of wood materials but has excellent bending rigidity. [Means for solving the problem]

[0007] The present invention has been made to solve at least some of the above-mentioned problems, and can be realized as the following aspects or application examples.

[0008] [1] One aspect of the building according to the present invention is: A building with a rigid-frame structure, The rigid frame structure includes a pair of steel columns and a composite structural beam extending from the pair of columns, The composite structural beam is characterized by comprising a pair of steel beam end members rigidly connected to a pair of the columns, and a wooden beam intermediate member sandwiched between the pair of beam end members.

[0009] [2] In one aspect of the above building, the beam intermediate member has protrusions protruding from both end surfaces toward the opposing beam end members, the beam end member has a receiving portion on an end surface into which the protrusion is inserted, The joint between the beam end member and the beam intermediate member can be joined by a plurality of bolts extending in the longitudinal direction of the beam intermediate member with the protrusion inserted into the receiving portion. [3] In one aspect of the above building, The beam end member includes a steel plate extending vertically and protruding toward the beam intermediate member, The beam intermediate member has a slit formed on an end surface thereof that opens and penetrates vertically, The joint between the beam end member and the beam intermediate member can be formed by inserting the steel plate into the slit and joining multiple rods through the beam intermediate member and the steel plate from one side of the beam end member to the other side.

[0010] [4] In one aspect of the above building, The beam end member includes flanges on the top and bottom and webs extending vertically to connect the flanges, The beam intermediate member has a slit formed on an end surface thereof that opens and penetrates vertically, The joint between the beam end member and the beam intermediate member can be formed by inserting the end of the web into the slit and joining multiple rods extending vertically through the upper and lower flanges and the beam intermediate member.

[0011] [5] In one aspect of the above building, The beam end member includes a steel plate extending horizontally and protruding from an end surface, The beam intermediate member is placed on the steel plate, A concrete slab may be poured on the beam end members and the beam intermediate members.

[0012] [6] In one aspect of the above building, The joint position between the beam end member and the beam intermediate member may be a reversal point of bending moment in the composite structural beam under long-term load. [Effects of the Invention]

[0013] According to one aspect of the building of the present invention, by providing steel beam end members at both ends, it is possible to provide a building equipped with a composite structural beam that has excellent bending rigidity under long-term loads while using intermediate beam members made of wood material. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a front view schematically showing a rigid frame structure of a building according to a first embodiment. [Figure 2] FIG. 2 is an enlarged view of the joint in FIG. 1. [Figure 3] FIG. 2 is an enlarged plan view showing the joint portion of FIG. 1. [Figure 4] 1A and 1B are diagrams illustrating bending moments in a composite structural beam. [Figure 5] FIG. 10 is an enlarged front view showing a portion of a joint of a building according to a second embodiment. [Figure 6] 6 is a cross-sectional view taken along the line AA in FIG. 5. [Figure 7] FIG. 11 is an enlarged front view showing a portion of a joint of a building according to a third embodiment. [Figure 8] 8 is a cross-sectional view of FIG. 7 taken along line B-B. [Figure 9] FIG. 10 is an enlarged front view showing a portion of a joint of a building according to a fourth embodiment. [Figure 10] 10 is a cross-sectional view taken along CC in FIG. 9. DETAILED DESCRIPTION OF THE INVENTION

[0015] Preferred embodiments of the present invention will be described in detail below with reference to the drawings. Note that the embodiments described below do not unduly limit the content of the present invention as defined in the claims. Furthermore, not all of the configurations described below are necessarily essential components of the present invention.

[0016] One aspect of a building according to this embodiment is a building having a rigid frame structure, characterized in that the rigid frame structure comprises a pair of steel columns and a composite structural beam extending from the pair of columns, and the composite structural beam comprises a pair of steel beam end members rigidly joined to the pair of columns, and a beam intermediate member made of wood material sandwiched between the pair of beam end members.

[0017] 1. First embodiment A building 100 according to a first embodiment of the present invention will be described with reference to Figures 1 to 4. Figure 1 is a front view schematically showing a rigid frame structure 110 of the building 100 according to the first embodiment, Figure 2 is an enlarged view of a joint 40 in Figure 1, and Figure 3 is a plan view showing an enlarged view of the joint 40 in Figure 1. 2 is a diagram illustrating the bending moment in the composite structural beam 2, and FIG. 4 is a diagram illustrating the bending moment in the composite structural beam 2. In FIG. 2, a cross section (shaded portion) of a portion of the first beam end member 10 and the beam intermediate member 30 is shown to explain the protrusion portion 411 and the receiving portion 421. Note that while FIGS. 2 and 3 only show the structure of one joint 40, the other joint 40 can basically adopt a similar configuration.

[0018] Overview As shown in FIG. 1, the building 100 is a building 100 that has a rigid frame structure 110. The rigid frame structure 110 has a pair of steel columns 1,1 and a composite structural beam 2 extending from the pair of columns 1,1. The composite structural beam 2 is joined at both ends to the two steel columns 1,1 in the building 100. Although not shown, the building 100 is provided with a plurality of rigid frame structures 110, similar to buildings that have general rigid frame structures. The composite structural beam 2 is a long beam that can be used, for example, in a building 100 where the distance between adjacent columns 1,1 is relatively long.

[0019] The columns 1, 1 of the steel frame are rectangular steel pipes, but may also be cylindrical steel pipes or known steel materials such as H-shaped steel.

[0020] The composite structural beam 2 comprises a pair of steel beam end members (first beam end member 10 and second beam end member 20) rigidly joined to a pair of columns 1, 1, and a wooden beam intermediate member 30 sandwiched between the pair of beam end members (first beam end member 10 and second beam end member 20). While the configuration of the first beam end member 10 and the beam intermediate member 30 will be described in Figure 2 and subsequent figures, the second beam end member 20 and the beam intermediate member 30 can also adopt a similar configuration, and can also be combined with other embodiments described below. The first beam end member 10, the second beam end member 20, and the beam intermediate member 30 are joined together by two joints 40, 40.

[0021] The first beam end member 10 and the second beam end member 20 are steel frames. Each of the first beam end member 10 and the second beam end member 20 is made of an H-shaped steel, with one end welded to the column 1 and the other end joined to the beam intermediate member 30 at a joint 40. At the other end, a steel plate that comes into surface contact with the beam intermediate member 30 is welded and fixed to the end face of the H-shaped steel to form a second joint end face 42.

[0022] The first beam end member 10 and the second beam end member 20 have horizontally extending flanges 11, 12 arranged at a distance from each other above and below, and a web 13 extending vertically between the flanges 11, 12. The base ends of the first beam end member 10 and the second beam end member 20 are joined to the columns 1, 1. The column 1 and the first beam end member 10 (or the second beam end member 20) may be integrally formed in advance at a factory by welding or the like, and then transported to the construction site in an integrated state. The first beam end member 10 and the second beam end member 20 are not limited to H-shaped steel, but may also be known steel frames used for beams in rigid frame structures, such as I-shaped steel, L-shaped steel, steel pipes, etc., or a steel frame made up of a combination of these.

[0023] Braces 3 are fixed between the first beam end member 10 and the column 1, and between the second beam end member 20 and the column 1. The braces 3 are reinforcing members made of shaped steel, and they prevent the building 100 from deforming due to lateral forces such as earthquakes and wind. Even when the rigid frame structure 110 is equipped with steel braces 3, the ends of the braces 3 are fitted only with steel members, making it easy to apply existing design methods and details to the rigid frame structure 110. Note that the rigid frame structure 110 may also be a pure rigid frame structure that does not have braces 3. The building 100 may also have a rigid frame structure other than the rigid frame structure 110 in part.

[0024] The beam intermediate member 30 is bridged between the first beam end member 10 and the second beam end member 20 and extends horizontally. The beam intermediate member 30 is made of a wooden material. The wooden material used for the beam intermediate member 30 may be any wooden material used for structures, and for example, laminated lumber made by gluing and shaping multiple sawn boards, or laminated material made by stacking and gluing thin boards such as veneers, are preferred for steel materials.

[0025] 1.2.Joints As shown in Figure 1, the composite structural beam 2 has two joints 40, 40. In one joint 40 of the composite structural beam 2, a second joint end surface 42 of the first beam end member 10 is joined to a first joint end surface 41 at one end of the beam intermediate member 30 in contact with each other. In the other joint 40, a second joint end surface 42 of the second beam end member 20 is joined to a first joint end surface 41 at the other end of the beam intermediate member 30 in contact with each other. The second joint end surface 42 is the end surface of the first beam end member 10 that is located on the opposite side in the horizontal direction from the portion where the first beam end member 10 is joined to the column 1.

[0026] 2 and 3 , the joint 40 between the first beam end member 10 and the beam intermediate member 30 is joined by a plurality of bolts 422 extending in the longitudinal direction of the beam intermediate member 30, with the protrusions 411 inserted into the receiving portions 421. The bolts 422 may be, for example, anchor bolts, lag screw bolts, or glued-in rods. One end of the bolt 422 is fixed to, for example, the tip steel plate 420 of the first beam end member 10, and the other end is fixed to the beam intermediate member 30 with a nut 423. The bolt 422 passes through an opening in the tip steel plate 420 and a through-hole inside the beam intermediate member 30 and extends to a notch 410 midway through the beam intermediate member 30.

[0027] The beam intermediate member 30 has protrusions 411 that protrude from first joint end faces 41, which are both longitudinal end faces, toward the opposing first beam end member 10 and second beam end member 20 (FIG. 1). The protrusions 411 are, for example, rectangular parallelepiped-shaped and formed integrally with the first joint end face 41, and can be formed by carving out the wooden material of the beam intermediate member 30 up to the first joint end face 41 so as to leave the protrusions 411. The protrusions 411 are fitted into receiving portions 421, which will be described later, to form a joint using a so-called tenon joint. The protrusions 411 may be shear keys that are long in the vertical direction, as shown in the figure.

[0028] Since the beam intermediate member 30 is made of wood material, it can be joined to a lightweight wooden floor (not shown) using conventional nail joints, making it easy to evaluate the shear force transmission performance and also easy to install.

[0029] The first beam end member 10 and the second beam end member 20 (FIG. 1) each have a receiving portion 421 on their second joint end surface 42, into which the protrusion 411 is inserted. The receiving portion 421 is a recess or through-hole that opens into the second joint end surface 42 and has a shape that fits the protrusion 411. The second joint end surface 42 may be the end surface of a vertically extending tip steel plate 420 that is integrated by welding or the like to the longitudinal tip of the first beam end member 10. It is preferable that the first joint end surface 41 of the first beam end member 10 contacts the tip steel plate 420 and that the protrusion 411 is inserted into the receiving portion 421 when joined with a bolt 422. The tip steel plate 420 is larger than the overall height and width of the first beam end member 10 and is welded perpendicular to the web 13. One receiving portion 421 is formed at the center of the tip steel plate 420, but multiple receiving portions 421 may be formed. The receiving portion 421 is preferably sized to restrict movement of the protrusion 411 in directions other than the direction in which it comes out of the receiving portion 421 (the longitudinal direction of the composite structural beam 2) when the joint 40 is joined. By the receiving portion 421 restricting the movement of the protrusion 411, the strength of the composite structural beam 2 when a shear force acts on the joint 40 is improved.

[0030] According to the building 100 of this embodiment, by providing a first beam end member 10 and a second beam end member 20 made of steel at both ends, it is possible to provide a building 100 equipped with a composite structural beam 2 that has excellent flexural rigidity under long-term loads even while using a wooden intermediate beam member 30. The joints 40 allow the intermediate beam member 30 to bear seismic forces. The building 100 equipped with a rigid frame structure 110 can have a frame that is more rigid than a pure wooden frame, and can suppress vertical and horizontal deformation in large-span buildings and buildings of medium or larger heights.

[0031] 1.3. Bending moment 4 shows the bending moment M of the composite structural beam 2 in FIG. 1 under long-term load. The bending moment M reaches a maximum value on the positive side at the central axes O, O of the columns 1, 1 at both ends, gradually decreases from there, reaches a minimum at the joint 40, and then gradually increases on the negative side toward the center of the composite structural beam 2. Therefore, the joint position between the first beam end member 10 and the beam intermediate member 30 and the joint position between the second beam end member 20 and the beam intermediate member 30 can be the reversal points of the bending moment M of the composite structural beam 2 under long-term load.

[0032] Although it is difficult to transmit bending moment M at joint 40, because joint 40 is located at a position where bending moment M under long-term load (vertical force acting constantly) is minimum, composite structural beam 2 can achieve excellent bending rigidity under long-term load. In addition, by locating joint 40 between the steel frame part and the wooden part at a position where stress is small, joint 40 can be simplified, which is advantageous for the production and construction of component parts.

[0033] 2. Second embodiment The joint 40a of the building 100 according to the second embodiment will be described using Figures 5 and 6. Figure 5 is a front view showing an enlarged portion of the joint 40a of the building 100 according to the second embodiment. Figure 6 is a cross-sectional view taken along line AA in Figure 5. The composite structural beam 2a shown in Figures 5 and 6 has the same basic configuration as the composite structural beam 2 according to the first embodiment, except for the configuration of the joint 40a, so duplicated explanations, including of the column 1 and brace 3, will be omitted. Furthermore, the configurations of the second beam end member 20 and the beam intermediate member 30 are the same as the configurations of the first beam end member 10 and the beam intermediate member 30 described below. Note that the drift pin 414 is indicated by a dashed line in Figure 6.

[0034] The first beam end member 10 is provided with a steel plate 424 that extends vertically and protrudes toward the beam intermediate member 30. The steel plate 424 can be formed on an extension of the web 13, sandwiching the tip steel plate 420. The steel plate 424 extends in the vertical direction. The base end of the steel plate 424 is joined to the second joining end surface 42 of the tip steel plate 420 by welding or the like, and the tip is inserted into the beam intermediate member 30. The steel plate 424 has a plurality of through holes 425 that penetrate from the front side to the back side. The through holes 425 are holes into which drift pins 414, described later, are inserted. The steel plate 424 has a thickness that allows it to be inserted into the slit 412 and that, when inserted, its lateral movement is limited by the inner surface of the slit 412.

[0035] The beam intermediate member 30 has slits 412 formed therein that open to the first joint end face 41 and penetrate vertically. The slits 412 extend in the longitudinal direction of the beam intermediate member 30 from the first joint end face 41 toward the inside of the beam intermediate member 30. The slits 412 penetrate the beam intermediate member 30 in the vertical direction. The beam intermediate member 30 has a plurality of through holes 413 that extend from the front side to the back side. The through holes 413 are holes into which drift pins 414, which will be described later, are inserted, and are formed at positions that coincide with the through holes 425.

[0036] The joint 40a between the first beam end member 10 and the beam intermediate member 30 is formed by inserting a steel plate 424 into the slit 412 and connecting multiple rods (e.g., drift pins 414) through the beam intermediate member 30 and the steel plate 424 from one side to the other of the first beam end member 10. The drift pins 414 penetrate the beam intermediate member 30 and the steel plate 424 perpendicularly. Tension bolts may be used instead of the drift pins 414. The slits 412 and the drift pins 414 (or tension bolts) restrict movement of the steel plate 424 relative to the beam intermediate member 30 in the vertical direction and in the longitudinal direction of the beam intermediate member 30, firmly connecting the first beam end member 10 and the beam intermediate member 30. The joint 40a can transmit bending moment and shear force between the steel first beam end member 10 and the wooden beam intermediate member 30. The joint 40a allows the beam intermediate member 30 to bear the seismic force.

[0037] The joint 40a is resistant to bending moment under long-term load (vertical force acting constantly) as in the first embodiment. Since the bending moment M is at a minimum, the composite structural beam 2a can achieve excellent bending rigidity under long-term load.

[0038] 3. Third embodiment The joint 40b of the building 100 according to the third embodiment will be described using Figures 7 and 8. Figure 7 is a front view showing an enlarged portion of the joint 40b of the building 100 according to the third embodiment, and Figure 8 is a cross-sectional view taken along the line B-B of Figure 7. The composite structural beam 2b shown in Figures 7 and 8 has the same basic configuration as the composite structural beam 2 according to the first embodiment, except for the configuration of the joint 40b, and therefore, redundant explanations including the column 1 and the brace 3 will be omitted. Furthermore, the configurations of the second beam end member 20 and the beam intermediate member 30 are the same as the configurations of the first beam end member 10 and the beam intermediate member 30 described below.

[0039] The first beam end member 10 includes upper and lower flanges 11, 12 and a web 13 extending vertically and connecting the flanges 11, 12. The first beam end member 10 can be an H-shaped steel. The web 13 has a hinge portion 431, and the hinge portion 431 includes a haunch portion 432 that widens downward so that the overall height of the web 13 gradually increases from the column 1 side toward the second joint end face 42 side. The distance between the upper and lower flanges 11, 12 at the second joint end face 42 is approximately the same as the height of the beam intermediate member 30, and the beam intermediate member 30 is joined to the web 13 at this same height.

[0040] The beam intermediate member 30 has a slit 412 formed therein that opens at the first joint end face 41 and penetrates vertically. The slit 412 is formed with a width that can receive a web 13 that is approximately the same height as the beam intermediate member 30. By inserting the web 13 into the slit 412, the right portion 31 and the left portion 32 of the beam intermediate member 30 are positioned so as to sandwich the web 13 as shown in FIG. 8, and movement of the beam intermediate member 30 to the front and rear is restricted. The second joint end face 42 may be in contact with the innermost portion of the slit 412, in which case movement of the beam intermediate member 30 is restricted in any direction other than the direction in which the web 13 passes through the slit 412.

[0041] The joint 40b between the first beam end member 10 and the beam intermediate member 30 is formed by inserting the end of the web 13 into the slit 412 and joining multiple rods 433 extending vertically through the upper and lower flanges 11, 12 and the beam intermediate member 30. The rods 433 are fixed to the upper and lower surfaces of the beam intermediate member 30. If there is a gap between the flange 11 and the beam intermediate member 30, a filler plate (not shown) may be placed on the beam intermediate member 30 to adjust its height before fastening it with the rods 433. The joint 40b limits the vertical movement of the beam intermediate member 30 via the flanges 11, 12 and, if necessary, the filler plate. The joint 40b allows the beam intermediate member 30 to bear seismic forces. The rods 433 may be headed anchor bolts. For example, the rods 433 may be inserted from the flange 12 side and fastened by tightening a nut onto the threaded portion protruding above the flange 11.

[0042] The joint 40b has excellent fracture toughness due to the provision of a haunch 432 in the first steel beam end member 10 to intentionally facilitate plastic deformation in the steel portion. As in the first embodiment, the joint 40b is located at a position where the bending moment M under long-term loading (vertical force acting constantly) is minimized, so the composite structural beam 2b can achieve excellent bending rigidity under long-term loading.

[0043] 4. Fourth embodiment The joint 40c of the building 100 according to the fourth embodiment will be described with reference to Figures 9 and 10. Figure 9 is a front view showing an enlarged portion of the joint 40c of the building 100 according to the fourth embodiment, and Figure 10 is a cross-sectional view taken along the line CC of Figure 9. The composite structural beam 2c shown in Figures 9 and 10 has the same basic configuration as the composite structural beam 2 according to the first embodiment, except for the configuration of the joint 40c, and therefore, redundant explanations including the column 1 and the brace 3 will be omitted. In addition, the configuration of the second beam end member 20 and the beam intermediate member 30 is the same as the configuration of the first beam end member 10 and the beam intermediate member 30 described below. is the same as:

[0044] The first beam end member 10 has a mounting portion 435 made of a steel plate that extends horizontally and protrudes from the second joint end surface 42. The mounting portion 435 may be formed to extend the flange 12. The second joint end surface 42 is the surface of the tip steel plate 420 that extends upward from the boundary between the flange 12 and the mounting portion 435, facing the beam intermediate member 30. Providing the joint portion 40c with the mounting portion 435 makes it easier to install the beam intermediate member 30, improving workability.

[0045] The beam intermediate member 30 is placed on a steel plate, which is the mounting portion 435. The first joint end surface 41 of the beam intermediate member 30 contacts the second joint end surface 42 of the tip steel plate 420. As shown in FIG. 10 , the width of the mounting portion 435 is preferably the same as or longer than the width of the beam intermediate member 30. The beam intermediate member 30 placed on the mounting portion 435 is arranged so as to be sandwiched between side plates 437, 438 formed of steel plates extending upward from the mounting portion 435. The side plates 437, 438 have their lower ends integrated with the mounting portion 435 by welding or the like, and have the same height as the beam intermediate member 30. By providing the side plates 437, 438 to the joint portion 40c, movement of the beam intermediate member 30 to the front and rear sides can be restricted.

[0046] The joint 40c may further include a cover member 439 made of an inverted U-shaped steel plate that covers the side plates 437, 438 and the beam intermediate member 30. The cover member 439 has a horizontally extending portion that covers the upper surfaces of the beam intermediate member 30 and the side plates 437, 438, and a vertically extending portion that covers the outsides of the side plates 437, 438. The cover member 439 has the same horizontal length as the mounting portion 435, extending from the second joint end surface 42 of the tip steel plate 420 along the beam intermediate member 30. By including the cover member 439 in the joint 40c, deformation of the side plates 437, 438 can be suppressed.

[0047] A concrete slab 440 is poured on the first beam end member 10 and the beam intermediate member 30. The joint 40c can transmit the shear force in the rigid frame structure 110 to the beam intermediate member 30. A plurality of headed studs 434 may be joined upward from the upper surfaces of the flange 11 and the beam intermediate member 30. The studs 434 on the flange 11 are joined to the upper surface of the flange 11 by welding. The studs 434 of the beam intermediate member 30 are joined by being partially embedded in holes formed in the upper surface of the beam intermediate member 30. The studs 434 on the joint 40c pass through through holes formed in the cover member 439. Similar to the first embodiment, the joint 40c is located at a position where the bending moment M under long-term load (vertical force that constantly acts) is minimized, and therefore the composite structural beam 2c can achieve excellent bending rigidity under long-term load.

[0048] The present invention is not limited to the above-described embodiments, and various modifications are possible. For example, the present invention includes configurations that are substantially the same as the configurations described in the embodiments (for example, configurations with the same function, method, and result, or configurations with the same purpose and effect). The present invention also includes configurations in which non-essential parts of the configurations described in the embodiments are replaced. The present invention also includes configurations that achieve the same effects or purposes as the configurations described in the embodiments. The present invention also includes configurations in which publicly known technology is added to the configurations described in the embodiments. [Explanation of symbols]

[0049] 1...column, 2, 2a, 2b, 2c...composite structural beam, 3...brace, 10...first beam end member, 11, 12...flange, 13...web, 20...second beam end member, 30...intermediate beam member, 31...right portion, 32...left portion, 40, 40a, 40b, 40c...joint portion, 41...first joint end surface, 42...second joint end surface, 100...building, 110...rigid frame structure, 410...notch portion, 411...projection portion, 412...slit, 413...through hole, 414...drift pin, 420...tip steel plate, 421...receiving portion, 422...bolt, 423...nut, 424...steel plate, 425...through hole, 431...hinge portion, 432...haunch portion, 433...rod, 434...stud, 435... Placement portion, 437, 438... side plates, 439... cover member, 440... concrete slab, M... bending moment, O... central axis

Claims

1. A building with a rigid-frame structure, The rigid frame structure includes a pair of steel columns and a composite structural beam extending from the pair of columns, A building characterized in that the composite structural beam comprises a pair of steel beam end members rigidly connected to a pair of the columns, and a wooden beam intermediate member sandwiched between the pair of beam end members.

2. In the building according to claim 1, the beam intermediate member has protrusions protruding from both end surfaces toward the opposing beam end members, the beam end member has a receiving portion on an end surface into which the protrusion is inserted, a beam end member and a beam intermediate member connected to each other by a plurality of bolts extending in the longitudinal direction of the beam intermediate member, with the protrusion inserted into the receiving portion;

3. In the building according to claim 1, The beam end member includes a steel plate extending vertically and protruding toward the beam intermediate member, The beam intermediate member has a slit formed on an end surface thereof that opens and penetrates vertically, A building characterized in that the joint between the beam end member and the beam intermediate member is formed by inserting the steel plate into the slit and joining multiple rods through the beam intermediate member and the steel plate from one side of the beam end member to the other side.

4. In the building according to claim 1, The beam end member includes flanges on the top and bottom and webs extending vertically to connect the flanges, The beam intermediate member has a slit formed on an end surface thereof that opens and penetrates vertically, The joint between the beam end member and the beam intermediate member is characterized in that, with the end of the web inserted into the slit, multiple rods extending vertically pass through the upper and lower flanges and the beam intermediate member to be joined.

5. In the building according to claim 1, The beam end member includes a steel plate extending horizontally and protruding from an end surface, The beam intermediate member is placed on the steel plate, A building, characterized in that a concrete slab is poured on the beam end members and the beam intermediate members.

6. In the building according to any one of claims 1 to 5, A building, characterized in that the joint position between the beam end member and the beam intermediate member is the reversal point of bending moment under long-term load in the composite structural beam.

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