JP2014222016A - Frame structure of tabular multi-dwelling house - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a frame structure of tabular multi-dwelling house that can suppresses projection of columns and beams to a residential space and also can reduce the construction cost without decreasing the dwelling performance.SOLUTION: A frame structure 1 comprises: a pair of first frames 10 that extend in the ridge direction, are disposed as opposing each other in the span direction, and are constructed in a reinforced concrete frame structure with reinforced concrete columns 11 and reinforced concrete beams 12; and second frames 20 that extend in the span direction, and are constructed in a concrete-column steel-beam structure with a pair of the reinforced concrete columns 11 opposing each other and steel beams 22 stretched between the pair of the reinforced concrete columns 11. The second frames 20 are constructed so that each story F has steel braces 23 that are disposed inside walls 3a, 3b formed between the pair of reinforced concrete columns 11 to bear stationary loads.

Description

  The present invention relates to a frame structure of a plate-shaped apartment house, and in particular, relates to a frame structure in which a girder direction is an RC structure and a beam S structure is mixed in the direction between beams.

  Conventionally, RC (steel reinforced) construction is often used in plate-like houses such as apartment houses because of performance and cost advantages. For example, by arranging a reinforced concrete wall on the doorway, it is possible to improve the sound insulation between adjacent dwelling units and improve the earthquake resistance in the direction between beams. On the other hand, if the thickness of the door wall or slab is set with emphasis on comfort (vibration, sound, etc.), the member dimensions may be larger than those based on structural safety. However, since the building weight increases, it is necessary to enlarge the pillars and foundations that support the load, resulting in a significant increase in construction costs.

  In addition, in RC plate-shaped houses, pillars and beams overhang into the living space and become an obstacle to the formation of free space, so a frame that stands upright along the longitudinal direction of the plate-shaped house, Formed from pillars and beams made of steel-concrete structure material with H-shaped steel as a steel frame, and standing up to several pillars made of multiple steel frames along the short direction (boundary of the dwelling unit) between the opposing pillars. In addition, there has been proposed a frame structure in which small beams made of steel frames (S) are connected between the inter-columns, the inter-columns are arranged in the door wall, and the small beams are embedded in the slab floor (see Patent Document 1). According to this frame structure, since reinforced concrete is not used in the short direction of the plate-like house, the building weight can be reduced.

Japanese Patent No. 4520242

  However, in the frame structure of Patent Document 1, since many studs are installed, it is necessary to construct foundation piles and footings corresponding to each stud, and the construction cost is still high particularly in the foundation.

  The present invention has been made in view of such a background, and provides a frame structure of a plate-like house that can reduce the construction cost without deteriorating the house performance while suppressing the overhang of pillars and beams into the living space. Is its main purpose.

  In order to solve the above problems, the present invention is a frame structure (1) of a plate-shaped apartment house having a plurality of floors and a plurality of dwelling units (2) arranged in one direction at each floor (F), A first frame (10), which extends in the beam direction and is arranged in a pair so as to face each other in the beam-to-beam direction, and is configured as an RC rigid frame structure with reinforced concrete columns (11) and reinforced concrete beams (12), and extends in the beam-to-beam direction. A second frame (20) constructed in a column RC beam S structure by a pair of reinforced concrete columns (11) arranged to face each other and a steel beam (22) bridged between the pair of reinforced concrete columns; The second frame has a steel brace (23) arranged in a wall (3) formed between the pair of reinforced concrete columns and bearing a load at all levels. It is formed.

  According to the present invention, since the beam in the inter-beam direction is a steel beam, the beam shape can be prevented from projecting into the living space, the steel brace in the inter-beam direction is arranged inside the wall, and the second frame is the column RC. By adopting the beam S frame, it is possible to reduce the weight of the building while securing the seismic strength by increasing the horizontal proof stress in the inter-beam direction by the steel brace.

  Moreover, in the plate-like house using the steel beam bridged in the direction between the beams as in Cited Document 1, usually, a stud is provided between a pair of reinforced concrete columns, and the usual load is borne on the stud, while the steel brace is horizontal. Although only the force is borne, it is possible to omit the studs by constantly loading the steel brace, which makes it possible to reduce the number of foundation piles and downsize the foundation piles and footings. . Therefore, the construction cost can be reduced without deteriorating the housing performance. In addition, since the studs can be omitted, it is easy to provide an opening in the door wall, and the degree of freedom for future application changes is increased.

  Furthermore, when only a horizontal force is applied to the brace as in Cited Document 1, it is necessary to fix the steel brace after a load such as a slab on the upper floor is applied, and the steel brace is fixed during the construction of the column beam. I can't. Therefore, interior work cannot be performed in parallel with the construction method of the column beam, which is an obstacle to shortening the construction period. On the other hand, according to the present invention, the steel brace can be fixed simultaneously with the construction of the column beam by always bearing a load, and the construction period can be greatly shortened.

  Further, according to one aspect of the present invention, the horizontal force that can be borne by the steel brace provided in the lowermost layer is the horizontal force that can be borne by the steel brace provided in each layer above the lowermost layer. It can be set as the structure smaller than this.

  By configuring in this way, the ratio βu of the horizontal strength of the steel brace at each level to the retained horizontal strength is smaller than each level above it in the lowermost layer, that is, the toughness of the lowermost layer is higher than that of the upper layer Therefore, it is difficult for the frame structure to be destroyed by the lateral force, so that it is possible to avoid an increase in the member size.

  Further, according to one aspect of the present invention, at least in the lowest layer (F1), the steel beam is bridged between the pair of reinforced concrete columns without interposing a column, and the lower end of the steel brace is connected to the reinforced concrete column. It can be set as the structure arrange | positioned so that it may join in the vicinity of the lower end of this, and a square shape may be exhibited.

  By comprising in this way, it can be made to transmit to the foundation part (foundation pile) via the lower end of a pair of reinforced concrete which opposes the axial force from the hierarchy one level above the lowest layer. Therefore, it is sufficient to arrange the foundation piles only on the outer peripheral edge of the plate-like house, and the construction cost can be effectively reduced.

  Further, according to one aspect of the present invention, the steel brace divides the wall into four spans, and the first span (S1) to the fourth span (S4) from one reinforced concrete column to the other reinforced concrete column. Is a single brace arranged as a single diagonal material in each span, and in the upper layers (F2, F3,...) Above the lowermost layer (F1), W-shaped and inverted W-shaped Are arranged from the first span to the fourth span so as to be alternately presented toward the upper layer, and in the lowermost layer, two are arranged in the first and fourth spans so as to exhibit a C-shape. It can be.

  By setting it as such a structure, while only the outer periphery of a plate-shaped house can be arrange | positioned of a foundation pile, a construction cost can be reduced effectively, and a stud can be eliminated in all the stories.

  In addition, in the upper layer above the lowest layer, the fracture mechanism of the structural surface in the direction between the beams is determined by the characteristics of the steel frame (characteristics with high toughness), so the Ds value used to calculate the required retained horizontal strength value While the (structural characteristic coefficient) is a relatively small value, the foundation concrete and the reinforced concrete columns form rigid joints in the lowermost layer, and the failure mechanism of the construction in the inter-beam direction is the RC characteristic (characteristic with low toughness) Therefore, the Ds value becomes a relatively large value, and a large member size is required. Therefore, as a configuration as described above, by reducing the burden on the horizontal force of the lowermost steel brace, the ratio βu of the sum of the horizontal strength of the lowermost load-bearing walls (steel braces) to the retained horizontal strength is reduced, That is, the toughness can be increased and the Ds value can be decreased to avoid an increase in member size.

  In addition, according to one aspect of the present invention, the steel brace disposed in the lowermost layer can be configured such that the upper end or the lower end is movably connected in the inter-beam direction so as not to bear a horizontal force.

  By configuring in this way, the ratio βu to the retained horizontal proof stress by the lowermost steel brace is set to approximately 0, that is, the toughness is maximized, the Ds value is reliably decreased, and the increase in the member size is avoided. be able to.

  Thus, according to the present invention, it is possible to provide a plate-like house that can reduce the construction cost without deteriorating the house performance while suppressing the protrusion of the pillars and beams to the living space.

The schematic perspective view of the frame structure of the plate-shaped apartment house concerning a 1st embodiment Schematic plan view showing the second floor part of the frame structure shown in FIG. FIG. 2 is a schematic cross-sectional view of the frame structure taken along line III-III in FIG. Explanatory drawing of the effect of the frame structure shown in FIG. Schematic plan view showing a modification of the frame structure shown in FIG. Schematic sectional view of the frame structure of a plate-like apartment house according to the second embodiment Schematic sectional view of the frame structure of a plate-like apartment house according to the third embodiment

  Hereinafter, the frame structure 1 of a plate-shaped apartment house according to the present invention will be described in detail with reference to the drawings with some embodiments.

<< First Embodiment >>
First, with reference to FIGS. 1-5, the frame structure 1 of the plate-shaped apartment house which concerns on 1st Embodiment of this invention is demonstrated. As shown in FIG. 1 to FIG. 3, the frame structure 1 is applied to a plate-shaped apartment house having a plurality of floors and a plurality of dwelling units 2 arranged in one direction at each floor F. It has the 1st structure 10 arrange | positioned in a pair so that it may extend and may oppose the direction between beams, and it may have the 2nd structure 20 extended in the direction between beams and arranged in multiple numbers at intervals in the column direction.

  The first frame 10 includes reinforced concrete columns (hereinafter referred to as RC columns 11) arranged at predetermined intervals in the direction of the beam and reinforced concrete beams (hereinafter referred to as RC beams 12) spanned between adjacent RC columns 11. ) To form an RC ramen structure. Note that the RC pillar 11 and the RC beam 12 may be constructed on site or assembled by assembling precast products. On the other hand, the second frame 20 is configured as a column RC beam S structure by a pair of RC columns 11 facing each other in the beam-to-beam direction and a steel beam 22 spanned between the pair of RC columns 11. The RC pillars 11 need only be arranged in at least two columns in the column direction, and the number of columns is not limited.

  In the second frame 20, in each level F, a soundproof material is installed inside and a wall material such as ALC (lightweight foamed concrete) is attached to form a wall 3 (shown in phantom lines in FIG. 2). The Hereinafter, the wall 3 between the adjacent dwelling units 2 is referred to as a door boundary wall 3a, and the wall 3 constituting the end surface of the corner dwelling unit 2 is referred to as an outer wall 3b as necessary. The wall 3 is provided over the entire length between the pair of RC columns 11 facing each other when the shared corridor or balcony is installed outside the RC column 11. When installed inside, at least the door boundary wall 3a is provided only in the inner part so as not to reach the RC pillar 11 between the pair of RC pillars 11 facing each other in the beam-to-beam direction. Here, both the door wall 3a and the outer wall 3b are provided over the entire length between the pair of RC pillars 11.

  The second frame 20 has a steel brace 23 in each layer F in addition to the pair of RC columns 11 and the steel beam 22. The steel brace 23 is disposed inside the wall 3, that is, inside the wall material, and always bears a load (vertical load), and is compressed not only by a tensile force due to a horizontal force during an earthquake but also by a vertical load. Since it is always subjected to a force, it is a known buckling restraint type that generates a stable axial force resistance in both tension and compression.

  As shown in FIGS. 2 and 3, the steel brace 23 is configured so that each span S is obtained when the wall 3 is divided from the first span S1 to the fourth span S4 from one RC column 11 to the other RC column 11. Is a single brace arranged as a single diagonal. The steel brace 23 has a total of one in each of the first span S1 and the fourth span S4 so that, in the lowermost layer F1, the lower end of the steel brace 23 is joined to the vicinity of the lower end of the RC pillar 11 to form a square shape. Two are arranged, and in the layers F2, F3,... Above the lowermost layer F1, the first span S1 is changed to the fourth span S4 so that the W shape and the inverted W shape are alternately presented toward the upper layer. A total of four of each one is arranged. Here, the lowest layer F1 means the first floor when the plate-like house does not have an underground floor, and means the lowest floor when it has an underground floor, and here, the lowest floor F1. Is the first floor, and in the figure, the number of floors is added to the head of the slab SL. The steel brace 23 is connected to the steel beam 22 and the joint portion with the RC pillar 11 via a gusset plate or the like, but these are omitted in the drawing.

  Specifically, the upper end of the steel brace 23 of the lowermost layer F1 is respectively connected to the steel beam 22 at the boundary between the first span S1 and the second span S2 and at the boundary between the third span S3 and the fourth span S4. Connected. In the steel brace 23 of the upper layer F2 in the first layer, the lower end of the steel brace 23 of the first span S1 and the second span S2 is directly above the upper end of the steel brace 23 of the first span S1 of the lowermost layer F1, that is, the first span S1. It is connected to the steel beam 22 at the boundary with the second span S2, and the lower end of the steel brace 23 of the third span S3 and the fourth span S4 is directly above the upper end of the steel brace 23 of the fourth span S4 of the lowest layer F1, that is, the first. The steel beam is connected to the steel beam 22 at the boundary between the third span S3 and the fourth span S4. Further, the steel brace 23 of the layer F3 on the first layer is also connected to the steel beam 22 at the lower ends thereof just above the upper ends of the steel braces 23 of the layer F2 directly below.

  Although detailed illustration is omitted, the upper end and the lower end of the steel brace 23 arranged on the upper floors F <b> 2, F <b> 3... From the second floor are near the steel beam 22 or the vicinity of the joint portion between the steel beam 22 and the RC column 11. Thus, the joint is a rigid joint fastened by a plurality of bolts and nuts. On the other hand, the steel brace 23 arranged on the first floor is connected to the same rigid joint at one of the upper end and the lower end, while the steel beam 22 or the steel beam 22 and the RC column 11 are used at the other of the upper end and the lower end. The roller is slidably or slidably contacted with a roller or the like so as to be movable in the direction between the beams. In addition, the steel brace 23 on the first floor can also be configured such that the upper end and the lower end are rigid joints.

  According to the second frame 20 configured as described above, as indicated by the solid arrows in FIG. 3, the vertical load (slab load) on the upper floor becomes the axial force (compressive force) of the steel brace 23 and RC. The load transmitted to the span boundary portion of the column 11 or the steel beam 22 and transmitted to the span boundary portion of the steel beam 22 is further transmitted downward as an axial force of the steel brace 23 of the lower floor, and the second floor slab 2SL. The load transmitted to the steel beam 22 of the lowermost layer F1 that supports the steel is transmitted to the foundation pile 6 via the RC pillar 11 or the foundation concrete 5 by the steel braces 23 arranged in the first span S1 and the fourth span S4, respectively. .

  As described above, the slab load is also borne by the steel brace 23, so that the proof strength against the vertical load is ensured even if the second frame 20 is not provided with the intermediate pillar 24 (see FIG. 4C). And since the steel brace 23 is provided only in 1st span S1 and 4th span S4 in the lowest layer F1, a vertical load does not transmit to the boundary part of 2nd span S2 and 3rd span S3, It is not necessary to provide the foundation pile 6 at the position.

  In addition, there are other merits by arranging the steel brace 23 in this way. As shown in FIG. 4A, when four steel braces 23 are installed in the lowermost layer F1 as well as the upper floor, the foundation pile 6 is required at the boundary between the second span S2 and the third span S3. In addition, as shown in the right side of the building, the typical Ds value (structural characteristic coefficient) is shown on the right side of the building. Since the Ds value is relatively small (0.25) because the toughness is determined by a large characteristic), in the lowermost layer F1, the fracture mechanism is determined by the RC characteristic (characteristic having low toughness), and the steel brace 23 Since the ratio βu of the horizontal proof strength to the retained horizontal proof strength is increased, that is, the toughness is reduced, the Ds value is increased (0.4 or more), and the member size is increased.

  On the other hand, in order to reduce βu, when the steel brace 23 is not installed in the lowermost layer F1 as shown in FIG. 4B, the Ds value can be made small (0.3). However, in the steel beam 22 in the lowermost layer F1, a vertical load is applied from the steel brace 23 on the upper floor, so that the strength is insufficient. In order to supplement the strength of the steel beam 22 of the lowermost layer F1, as shown in FIG. 4C, the boundary between the first span S1 and the second span S2 and the boundary between the third span S3 and the fourth span S4. Although it is also possible to provide the stud 24, in this case, the foundation pile 6 is required at the position of the stud 24 even though the Ds value can be reduced to a small value (0.3). Increases construction costs.

  Therefore, as in the present embodiment shown in FIG. 4D, in the lowermost layer F1, the two steel braces 23 are joined to the first span S1 and the fourth span S4 with their lower ends near the lower ends of the RC columns 11. By arranging in a square shape like this, it is possible to make the Ds value small (0.3) by reducing βu of the lowermost layer F1 while supplementing the strength of the steel beam 22 of the lowermost layer F1. Thus, an increase in member dimensions can be avoided.

  In addition, since the first frame 10 in the direction of the beam of the frame structure 1 has an RC frame structure, the construction cost can be reduced as compared with the case where the entire frame is made of steel (S). Since the second frame 20 in the beam-to-beam direction has a column RC beam S structure in which the RC column 11 and the steel beam 22 are combined, the weight of the building is reduced as compared with the case where the entire structure is an S structure, and the cost and weight are reduced. Both reductions can be realized.

  In addition, since the second frame 20 includes the steel brace 23 that always bears the load and does not include the stud 24, the foundation pile 6 for supporting the stud 24 is eliminated, and the cost of the entire building including the foundation is reduced. Has also been reduced. At the same time, since the spacer 24 can be omitted, it becomes easier to provide the opening 7 in the door wall 3a as shown by an imaginary line in FIG. 3, and the degree of freedom for future application changes is also increased.

  On the other hand, since the second frame 20 in the interbeam direction includes the steel beam 22 and the steel brace 23 arranged inside the wall 3, it becomes easy to prevent the beam type from protruding into the living space of the dwelling unit 2. At the same time, seismic strength in the direction between beams is also secured.

  Since the steel brace 23 is configured to always bear the load, when the frame structure 1 is constructed, the steel brace 23 is installed simultaneously with the installation of the steel brace 23 during the construction of the RC pillar 11 and the steel beam 22. The upper and lower end connections can be completed. Therefore, as in the case where the brace is configured to bear only the horizontal force, the start time of the interior work etc. is delayed by fixing the steel brace 23 after the load such as the slab on the upper floor is applied, and the construction period becomes longer. The construction period can be greatly shortened.

<Modification>
Next, a modification of the first embodiment will be described with reference to FIG. As shown in the figure, the frame structure 1 has the same first frame 10 as described above, but has every second frame 20 with respect to the RC pillars 11 arranged in the direction of the beam. 20 between the pair of RC columns 11 facing each other in the beam-to-beam direction and the steel beam 22 spanned between the pair of RC columns 11 to form a column RC beam S structure without the steel brace 23. Three frames 30 are provided.

  The second frame 20 is arranged on both end faces of the frame structure 1 and outer walls 3b shown by imaginary lines are provided, and the third frame 30 and the second frame 20 are alternately arranged on the other frame. The boundary walls 3 a indicated by imaginary lines are provided, and each level F is partitioned into a plurality of dwelling units 2 at intervals of the RC pillars 11 in the row direction. As a further modification, the door frame wall 3a is not provided in the third frame 30, and the dwelling unit 2 may be partitioned by the two spans of the RC pillar 11. Even if the frame structure 1 is configured in this way, the same effects as those of the first embodiment can be obtained.

<< Second Embodiment >>
Next, a frame structure 1 of a plate-like apartment house according to a second embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the same or similar member as 1st Embodiment, and the overlapping description is abbreviate | omitted. The same applies to the third embodiment.

  The frame structure 1 according to the present embodiment has the first frame 10 similar to that of the first embodiment in the direction of the beam, and the second frame 120 configured as shown in FIG. 6 in the direction between the beams. The details will be clarified below. As in the first embodiment, the second frame 120 is disposed on each level F, with a pair of RC columns 11 facing each other in the beam-to-beam direction, a steel beam 22 spanned between the pair of RC columns 11, and In addition to the steel brace 23 that is arranged inside the wall 3 and always bears a load, it is configured as a column RC beam S structure including an intermediate column 24. Here, the column RC means that the through column (RC column 11) joined to the foundation (foundation concrete 5 or foundation pile 6) is RC.

  The stud 24 is made of a steel frame, and the uppermost layer Fx from the layer F2 that is one layer above the lowermost layer F1 at the boundary between the first span S1 and the second span S2 and the boundary between the third span S3 and the fourth span S4. Two are provided on the same axis so as to span.

  On the other hand, in the lowermost layer F1, one steel brace 23 is added to each of the first span S1 and the fourth span S4 so that the lower end of the steel brace 23 is joined to the vicinity of the lower end of the RC pillar 11 to form a square shape. Two are arranged, and in the layers F2, F3,... Above the lowermost layer F1, a total of two of each one in the second span S2 and the third span S3 is provided in each layer F so as to exhibit an inverted V shape. Is arranged.

  Accordingly, in the second frame 120, the steel beam 22 supporting the second floor slab 2SL is bridged between the pair of RC columns 11 without the intermediary column 24 in the lowermost layer F1, and the lower end of the steel brace 23 is the RC column 11 The steel beam 22 is bridged between the pair of RC pillars 11 via the intermediate pillars 24 in the layers F2, F3,... Above the lowermost layer F1. The lower end is joined to the vicinity of the upper end of the middle column 24 or the steel brace 23 of the lower layer F.

  Since the second frame 120 is configured in this way, a part of the vertical load (slab load) on the upper floor becomes an axial force (compression force) of the intermediate pillar 24 and the steel brace 23, and the lower end of the intermediate pillar 24 is joined. The load transmitted to the span boundary portion of the steel beam 22 and transmitted to the span boundary portion of the steel beam 22 becomes the axial force of the steel brace 23 of the lowermost layer F1, and the foundation pile via the RC column 11 or the foundation concrete 5 6 is transmitted.

  As described above, the slab load is borne by the intermediate columns 24 and the steel braces 23, so that the number of the intermediate columns 24 and the number of the steel braces 23 of the second frame 20 are reduced as compared with the case where only one of them is used. At the same time, it is possible to ensure horizontal strength. In the lowermost layer F1, since the stud 24 is not provided and the steel brace 23 is provided only in the first span S1 and the fourth span S4, a vertical load is applied to the boundary portion between the first span S1 and the fourth span S4. Is not transmitted, and it is not necessary to provide the foundation pile 6 at a position other than directly below the RC pillar 11.

  Further, as in the first embodiment, in the lowermost layer F1, the two steel braces 23 are joined to the first span S1 and the fourth span S4 so that the lower ends thereof are joined in the vicinity of the lower ends of the RC pillars 11. By arranging, the Ds value can be reduced to a small value (0.3) by reducing βu of the lowermost layer F1 while supplementing the strength of the steel beam 22 of the lowermost layer F1, and the size of the member is increased. Can be avoided. In the present embodiment, the steel brace 23 of the lowermost layer F1 is configured not to bear the horizontal force by rolling or sliding the upper end or the lower end or to reduce the load of the horizontal force by using a member having a small allowable stress. By adopting such a configuration, the horizontal proof stress of the steel brace 23 can be made smaller than the upper layers F2, F3,... In the lowermost layer F1, and the toughness of the lowermost layer F1 can be improved. And since the number of the steel braces 23 has decreased in the upper layers F2, F3,..., A large opening 7 can be provided in the door wall 3a as shown by an imaginary line.

«Third embodiment»
Finally, with reference to FIG. 7, the frame structure 1 of the plate-shaped apartment house which concerns on 3rd Embodiment of this invention is demonstrated. The frame structure 1 according to the present embodiment includes a second frame 220 configured as shown in FIG. 7 in the beam-to-beam direction. Similar to the first embodiment, the second frame 220 is disposed at each level F, and the pair of RC columns 11 facing each other in the direction between the beams, the steel beam 22 spanned between the pair of RC columns 11, and the wall 3 The steel RC brace 23 is configured by a steel brace 23 that is disposed inside the steel brace 23 and always bears a load.

  In the lowermost layer F1, the steel brace 23 has a total of two in each of the first span S1 and the fourth span S4 so that the lower end of the steel brace 23 is joined to the vicinity of the lower end of the RC pillar 11 to form a square shape. In the upper layer F2, the lower end is joined to the boundary between the second span S2 and the third span S3 of the steel beam 22 and the boundary between the third span S3 and the fourth span S4, respectively. Thus, a total of two of each one is arranged in the second span S2 and the third span S3 so as to exhibit an inverted V shape, and a large inverted V over two layers is formed by the lowermost layer F1 and the uppermost layer F2. It has a letter shape. Further, in the upper layers F3, F4,... Above, the steel brace 23 is arranged so as to be in a large inverted shape every two layers.

  Even if the second frame 120 is configured in this way, the same effect as described in the first and second embodiments can be obtained, and the opening 7 indicated by an imaginary line can be formed in the door boundary wall 3a in a larger manner. Can be provided. Similarly to the second embodiment, the steel brace 23 of the lowermost layer F1 has a configuration in which the horizontal force is not borne by rolling or sliding the upper end or the lower end, or using a member having a small allowable stress. By reducing the horizontal strength of the steel brace 23 in the lowermost layer F1, the toughness of the lowermost layer F1 can be improved.

  The description of the specific embodiments is finished as described above, but the present invention is not limited to these embodiments, and can be changed as appropriate without departing from the spirit of the present invention. For example, in the second and third embodiments, as in the modification of the first embodiment, the second frames 120 and 220 are arranged every other frame with respect to the RC pillars 11 arranged in the column direction. It can be made into a form. In addition, all the components of the frame structure 1 according to the present invention shown in the above embodiment are not necessarily essential, and can be appropriately selected as long as they do not depart from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Frame structure 2 Dwelling unit 3 Wall 3a Door boundary wall 3b Outer wall 10 1st frame 11 RC pillar (reinforced concrete pillar)
12 RC beams (steel reinforced concrete beams)
20, 120, 220 2nd frame 22 steel beam 23 steel brace 24 stud F layer F1 bottom layer S1 first span S2 second span S3 third span S4 fourth span

In order to solve the above problems, the present invention is a frame structure (1) of a plate-shaped apartment house having a plurality of floors and a plurality of dwelling units (2) arranged in one direction at each floor (F), A first frame (10), which extends in the beam direction and is arranged in a pair so as to face each other in the beam-to-beam direction, and is configured as an RC rigid frame structure with reinforced concrete columns (11) and reinforced concrete beams (12), and extends in the beam-to-beam direction. A second frame (20) constructed in a column RC beam S structure by a pair of reinforced concrete columns (11) arranged to face each other and a steel beam (22) bridged between the pair of reinforced concrete columns; the provided, in the Harima direction, pillars supported by foundation concrete is only the pair of concrete columns, the second Frame is between the pair of reinforced concrete pillars The steel braces (23) to bear the operating load is arranged inside the wall (3) which is made be configured to have each hierarchy.

According to this configuration, since the beam in the inter-beam direction is a steel beam, the beam type can be prevented from projecting into the living space, the steel brace in the inter-beam direction is arranged inside the wall, and the second frame is the column RC. By adopting the beam S frame, it is possible to reduce the weight of the building while securing the seismic strength by increasing the horizontal proof stress in the inter-beam direction by the steel brace.

Further, the present invention is configured such that the horizontal force that can be borne by the steel brace provided in the lowermost layer is smaller than the horizontal force that can be borne by the steel brace provided in each layer above the lowermost layer. It shall be the.

According to this configuration, the ratio βu of the horizontal strength of the steel brace in each layer to the retained horizontal strength is smaller than each layer above it in the lowermost layer, that is, the toughness of the lowermost layer is higher than the upper layer, Since it is difficult for the frame structure to be destroyed by the lateral force, it is possible to avoid an increase in member size.

The present invention, in at least the lowermost layer (F1), wherein together with the steel beam is bridged between the pair of reinforced concrete pillars without using studs, bonding the steel brace the lower end near the lower end of the reinforced concrete column It shall be the two arranged configured to exhibit a form of a slanted roof and.

According to this structure, it can be made to transmit to the foundation part (foundation pile) via the lower end of a pair of reinforced concrete which opposes the axial force from the hierarchy one level above the lowest layer. Therefore, it is sufficient to arrange the foundation piles only on the outer peripheral edge of the plate-like house, and the construction cost can be effectively reduced.

Further, according to one aspect of the present invention, the steel brace divides the wall into four spans, and the first span (S1) to the fourth span (S4) from one reinforced concrete column to the other reinforced concrete column. when a piece brace disposed as a single diagonal members for each span, than the bottom layer (F1) upper hierarchy (F2, F3, · ·) in the, W-shaped and reverse W-shape Four are arranged from the first span to the fourth span so as to alternately present the shape toward the upper layer, and two are arranged in the first and fourth spans in the lowermost layer so as to exhibit a C-shape. It can be configured.

In addition, since the first frame 10 in the direction of the beam of the frame structure 1 has an RC frame structure, the construction cost can be reduced as compared with the case where the entire frame is made of steel (S). Since the second frame 20 in the beam-to-beam direction is a column RC beam S structure in which the RC column 11 and the steel beam 22 are combined, the weight of the building is reduced as compared with the case where the whole is made of RC , and the cost and weight are reduced. Both reductions can be realized.

In the lowermost layer F1, the steel brace 23 has a total of two in each of the first span S1 and the fourth span S4 so that the lower end of the steel brace 23 is joined to the vicinity of the lower end of the RC pillar 11 to form a square shape. In the upper layer F2, the lower end is joined to the boundary between the second span S2 and the third span S3 of the steel beam 22 and the boundary between the third span S3 and the fourth span S4, respectively. Thus, a total of two of each one is arranged in the second span S2 and the third span S3 so as to exhibit an inverted V shape, and a large inverted V over two layers is formed by the lowermost layer F1 and the uppermost layer F2. It has a letter shape. Further, in the upper layers F3, F4,... Above, the steel brace 23 is arranged so as to exhibit a large inverted V shape every two layers.

Claims (5)

It is a frame structure of a plate-shaped apartment house that has multiple levels and a plurality of dwelling units arranged in one direction at each level,
A first frame that extends in the beam direction and is arranged in a pair so as to face each other in the beam-to-beam direction, and is configured in an RC frame structure by reinforced concrete columns and reinforced concrete beams;
A second frame constructed in a column RC beam S structure by a pair of reinforced concrete columns facing each other and extending between the beams and steel beams spanned between the pair of reinforced concrete columns;
The frame structure of a plate-shaped apartment house, wherein the second frame has steel braces arranged at the inside of a wall formed between the pair of reinforced concrete columns and always bears a load.   The horizontal force that can be borne by the steel brace provided in the lowermost layer is smaller than the horizontal force that can be borne by the steel brace provided in each layer above the lowermost layer. The frame structure of the plate-shaped apartment house according to 1.   At least in the lowest layer, the steel beam is bridged between the pair of reinforced concrete columns without interposing a column, and the lower end of the steel brace is joined only near the lower end of the reinforced concrete column. The frame structure of the plate-shaped apartment house according to claim 1 or 2.   The steel brace is a single brace arranged as a single diagonal in each span when the wall is divided from the first span to the fourth span from one reinforced concrete column to the other reinforced concrete column, In the hierarchy above the lowermost layer, four W-shaped and inverted W-shaped shapes are alternately arranged from the first span to the fourth span so as to be alternately directed toward the upper layer. The two are arranged in the first and fourth spans so as to be joined in the vicinity of the lower end of the reinforced concrete column to form a square shape. 4. The frame structure of the plate-like apartment house described in 1.   The said steel brace arrange | positioned in the said lowermost layer connects so that an upper end or a lower end can move to the direction between beams so that a horizontal force may not be borne, The Claim 1 characterized by the above-mentioned. The frame structure of the plate-shaped apartment house described.

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