JPS5824576B2 - structure of structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure of a precast reinforced concrete structure that is structurally rigid and can also follow interlayer displacement of the structure.

In general structures, by effectively arranging shear walls and places as earthquake-resistant elements, the horizontal resistance of the structure can be increased during earthquakes and storms, making it effective in controlling the amount of deformation. Furthermore, we are trying to achieve economic effects such as improved safety and reduced material used in the frame structure.

Therefore, usually reinforced concrete shear walls are installed within the frame structure, or X- or V-shaped places made of reinforcing bars or reinforced concrete are provided as shown in Figures 7 and 8, but a frame structure that incorporates these Even if the purpose of making the frame itself rigid and reducing the amount of deformation of the frame can be achieved, on the contrary, it cannot sufficiently respond to the interlayer displacement of the structure that requires the amount of deformation, and furthermore, the yield and The destruction phenomenon is rapid and brittle, and there is also the possibility that other parts of the structure may be adversely affected.

For example, in the frame shown in Fig. 7, a large axial force is applied to the right column A and the downward right place B, which are compressed members, in response to a horizontal external force P, which may cause damage to the joint with place B, buckling of the compressed material, or Compression shear fracture occurs, and toughness cannot be expected, resulting in brittle fracture and a rapid decrease in yield strength.

In addition, in the frame shown in Fig. 8, if a plastic hinge is not properly created near the place contact point of the beam C, brittle fracture will result. To create this structure, it is necessary to adjust the beam cross section and place cross section for each floor, making the design of each member complicated.

The present invention was proposed in order to eliminate such defects.The present invention has been proposed in order to eliminate such defects, and it consists of a precast reinforced concrete place made by connecting the vertices of cross members with diagonal members in a space surrounded by precast reinforced concrete columns and beams. One or more PC steel rods are arranged, and the joints between the vertices of the same place and the pillars and beams, as well as the joints between the vertices of adjacent places, are each tightened with one or more PC steel rods. , the sliding strength of the joint is made variable depending on the magnitude of the tightening force of the PC steel beam, and the bending moment generated in the column and beam is controlled by a cross member in the place. This relates to the structure of the structure.

The present invention will be described below with reference to the illustrated embodiments.

1.2 are precast reinforced concrete columns and beams, respectively, and a precast reinforced concrete place 3 is arranged in a space surrounded by the studs and beams.

The place 3 is formed by connecting the vertices of the cross members 3a with diagonal members 3b, and the upper, lower, left and right apexes are provided with joint surfaces which are cut out horizontally and vertically, respectively.

In the embodiment shown in FIG. 1, a single place 3 is arranged in the column and beam space, and each vertex of the place 3 is located between the column 1 and the beam 2 with a required number of PC steel rods 4. It's tight.

In addition, in the embodiment shown in Fig. 2, there are two
Places 3 are arranged, and the apex of each place 3 is column 1
A required number of PC steel bars 4 are tightened between the beams 2, and a required number of PC steel bars 4 are tightened between the vertices of adjacent places 3.

3 and 4 show the joint between the place 3 and the beam 2, and the joint surface provided on the top surface of the place 3 is covered with mortar 5.
The beam collides with the beam 2 through the beam 2, and the beam 2 and the apex of the place 3 are tightened with a PC steel rod 4.

6 in the figure. γ is on the beam 2 and place 3! P provided
Grout mortar is injected into the through hole 8 of the C steel bar 4.

Therefore, according to the above embodiment, the joint of the place 3 to the column 1 and the beam 2 is located in the middle between them, and is not located at the column-beam joint, so the joint does not become complicated and the joint The construction is simple as it only requires tightening with PC steel rods and injecting mortar.

Further, FIG. 6 shows a load-deformation rate curve when a horizontal force P is applied to the frame shown in FIG. 1 as shown in FIG. 5.

In addition, the dotted line and the dashed-dotted line in the figure show the load-deformation rate curves of the reinforced concrete shear wall and the reinforced concrete frame frame, respectively.

Therefore, due to the action of the horizontal force P, tensile cracks occur in diagonal members a (tensile members) of place 3 in state a of the figure, and j tensile cracks occur in cross members c and d (tensile members) in state b. , C, the diagonal member a undergoes tensile yielding, and in the state d, the column 1
Bending cracks occur in the beam 2, and the cross members 2 and 3 yield under tension in state e.

Furthermore, the beam material 2 bends and yields in the state of f-g, and becomes f-h, g-
In condition h, diagonal member a′ (compression member) will be compressed or fractured, or column 1
causes bending compression failure.

In the figure, b', C', d', and e' are the sliding loads at the joints of the PC steel bars, which can be controlled by the tightening force of the PC steel bars, the number of PC steel bars, and the eccentricity of the beam and place.

Note that the amount of deformation after the joint slips can be taken by bending deformation of the PC steel rod, so that sufficient deformation can be achieved.

The mortar at the joint will collapse slightly from around the PC steel rod due to the amount of deformation.

In this way, the frame of the present invention allows the joints to slide at any load level, and also reduces the unbalanced force at the joints to only the bending of the beam or column when the tensile member of the place cracks or yields. It is possible to use the cross beams as tension members without relying on them, to limit the bending moment acting on the columns and beams, and thus to control the initial tone of the frame and the horizontal load bearing capacity, and to construct a frame with sufficient toughness. It is.

As mentioned above, the structure of the structure according to the present invention is structurally rigid, yet can follow interlayer displacement of the structure, and can be easily and reliably constructed. , the invention has many advantages.

Although the present invention has been described above with reference to embodiments, the present invention is, of course, not limited to such embodiments, and can be modified in various designs without departing from the spirit of the present invention. .

[Brief explanation of drawings]

1 and 2 are front views showing respective embodiments of the structure of a structure according to the present invention, FIG. 3 is an enlarged front view showing a joint between a precast reinforced concrete place and a precast reinforced concrete beam, and FIG. The figure is arrow IV- in Fig. 3.
FIG. IV, FIG. 5, and FIG. 6 are respectively explanatory views of the structure of the present invention, and FIGS. 7 and 8 are front views of the structure of the conventional structure, respectively. 1... Precast reinforced concrete column, 2.
...Precast reinforced concrete beam, 3...
...Precast reinforced concrete place, 4...
...PC steel rod.

Claims (1)

[Claims] 1. In a space surrounded by precast reinforced concrete columns and beams, one or more precast reinforced concrete places are installed by connecting the vertices of cross members with diagonal members, and the vertices of the places and the columns and beams are connected. The joints between the two places and the joints between the vertices of the adjacent places are joined by tightening them with one or more PC steel rods. A structure of a structure characterized in that the proof stress is variable and the bending moment generated in the columns and beams is controlled by cross members in the places.