JPS6037376A - Reinforced concrete skeletal with wall - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention This invention relates to a reinforced concrete frame with miscellaneous walls (hereinafter referred to as RC structure with miscellaneous walls) in which waist walls, hanging walls, sleeve walls, etc. are attached to columns and beams in the frame plane of a reinforced concrete building. (abbreviated as "skeleton") K-related, more specifically, RC with rough walls that has been improved to approach the behavior of a pure Ramen open frame.
Regarding skeleton construction.

(Background technology) The mechanical behavior of RC frames with rough walls is unclear during earthquakes, making it difficult to evaluate their seismic performance.

By the way, for example, in an RC frame with sleeve walls, if the sleeve walls can be ignored and the frame is of a beam yielding type, the state of rigid frame deformation during an earthquake is exaggerated as shown in Figure 1. Beam U undergoes bending yielding at one point. B in the figure is the ignored sleeve wall. This modification of FIG. 1 is the behavior of a pure rigid frame open frame.

According to the revised Building Standards Act, if the wall thickness is 100 days or less and the width is about 1/6 of the column width or less, the wall can be ignored.

However, in reality, the presence of walls changes the flow of force, making it difficult to handle them.

In other words, when leaning walls, waist walls, sleeve walls, etc. are attached to columns in the frame plane, local rigidity increases significantly, affecting stress concentration, eccentricity, and rigidity, or It is not uncommon for short columns to be formed that are prone to fragile fractures.

For example, when the sleeve walls restrain the deformation of the rigid frame, the rigid frame deforms during an earthquake as shown in Figure 2, and shear failure of the beam precedes it. C in the figure is the shear failure point of the beam.

Therefore, conventionally, as shown in Fig. 3, a slit D of an appropriate width is provided for the pillar trap, and the effective wall thickness tf of that part is I:10.
(It is set to 1 m or less, so that the existence of wall board B can be ignored.

In the figure, E indicates a pillar.

In other words, when the component force F of the shear force Q acting on the frame during an earthquake is applied to the wall plate B, the area where the sulin) D is provided is crushed early, and as a result, the presence of the wall plate B as shown in Figure 4. The aim is to obtain mechanical properties and behavior that can be ignored.

However, there is little experimental data regarding its effectiveness and performance, and it is unclear. Moreover, to put it simply, the portion where the slit D was provided was unexpectedly difficult to crush, and the existence of the wall board B could not be ignored. f, pickpocket 2l-D
The new seismic design method does not provide detailed information on installation methods, details, performance, etc., and most of these details will have to wait for future research. Speaking of SaraK, the above pickpocket 2)
When a joint like D is provided on the outside, it takes time and effort to remove the joint bar and seal the joint, and the elastic sealant has the disadvantage that it is expensive.

In addition, effective joints other than the above slits (non-slit)
Research has also been conducted on a method of providing a filter, but it has the same drawbacks and problems as described above and has not been an effective countermeasure.

(Object of the Invention) Therefore, the object of this invention is to improve the seismic performance of reinforced concrete frames with rough walls, and more specifically, to improve the seismic performance of reinforced concrete frames with rough walls. The mechanical behavior is brought closer to that of a pure ramen oven frame,
There is a need to make earthquake resistance evaluation easier.

The second object is to provide a reinforced concrete frame structure #I with rough walls that is easy and inexpensive to construct and does not require any work after concrete placement.

(Structure and effect of the first invention) In order to achieve the above object, the reinforced concrete frame with rough walls of the present invention has a plastic or thin iron plate in the center of the cross section at the joint site between the wall board and the column. By installing a relatively weak cylinder made of
It is designed to be less than 0■.

That is, when a component F of the shear force Q that acts during an earthquake is applied to the wall plate, both sides of the cylinder easily collapse at an early stage. Therefore, the rigid frame is not restrained by the wall plate, and exhibits the behavior shown in FIG. 4, resulting in mechanical properties in which the presence of the wall can be ignored.

Therefore, it is important to make earthquake resistance evaluation extremely easy.

In addition, since the cylinder is installed at the center of the cross-section of the viewing wall board, it does not affect the appearance at all, and there is no need for any work after concrete is poured, allowing for a flexible finish.

Furthermore, the cylindrical body can be easily installed as a trap when arranging reinforcement, making construction extremely easy, and since the cylindrical body itself is inexpensive, it is possible to reduce costs.

(Second Invention and Effects) In addition, in order to achieve the above object, the RC frame with rough walls of this invention is designed not only in the central part of the cross-section of the joint between the wall plate, the column, and the beam. In other words, the cylinders can be installed in various ways depending on the way the wall plate is pierced. , is an attempt to achieve a goal. Therefore, the effects of this invention are almost the same as those of the first invention.

However, the present invention is characterized in that it also targets non-opening walls.

That is, when a non-opening wall is subjected to a shear force Q due to an earthquake, the maximum proof stress is reached and shear failure Ge occurs in the diagonal direction with almost no deformation, as shown in FIG. However, if the above cylinder is installed properly on the non-opening wall,
As shown in Figure 6, the presence of the wall plate can be ignored due to vertical crushing (slip due to weakening) J and horizontal crushing (crushed concrete due to the cylinder) K. , the behavior is close to that of a pure Ramen open frame (close to the fracture pattern shown in Figure 1). In other words, it becomes a beam-yielding frame, exhibiting behavior that causes bending yield A in the beam.

Next, the illustrated embodiment will be described.

(Fig. 7 A and B of the first embodiment show an example of a reinforced concrete frame with sleeve walls. Fig. 7 A shows only the joint between the column and the sleeve wall; This is an example where a joint is provided at the joint between a beam and a sleeve wall. In the figure, 1゜2 is the column and beam forming a rigid frame, and
A sleeve wall.

A cylindrical body 4' is a cylindrical body installed over the entire length of the joint area between the four pillars 1 and the sleeve wall 6, and a cylindrical body L7 is installed over the entire length of the joint area between the beam 2 and the sleeve wall 3.

FIG. 8 shows the detailed structure of the main part. Cylindrical body 4 (same as cylinder body 4') made of plastic or thin iron plate, etc.
It is buried in the center of the cross-section of the joint between the column 1 and the sleeve wall 3. These cylindrical bodies 4, 4' are installed in advance at predetermined positions during reinforcement work. Concrete was then poured.

Therefore, when a shear force is applied during an earthquake, the cylindrical body installation part is easily crushed first. The frame shown in FIG. 7B deforms as shown in FIG. 4, for example, and exhibits the behavior of a so-called pure rigid frame open frame, not to mention that the existence of the sleeve walls 3 can be ignored.

The diameters of the cylindrical bodies 4 and 4' are set such that the effective wall thickness of the cylindrical body installation portion is 100 fl or less relative to the thickness of the wall plate 3.

(Second Example) FIG. 9 shows an example of an RC frame with waist walls. 5 in the figure is the waist wall. The cylindrical body 4 is installed only at the joint portion between the column 1 and the waist wall 5. However, as in Figure 7B,
It is effective to install a cylindrical body also at the joint portion between the beam 2 and the waist wall 5.

When this frame is subjected to shear force during an earthquake, its deformation and behavior will be similar to that of the pure rigid frame open frame shown in Figure 1.

(Third Example) FIGS. 10A and 10B show an example of an RC frame with a non-opening wall. In the figure, 6 is a non-opening wall. In the case of FIG. 10A, the cylindrical body 4 is installed at a joining site between the column 1 and the non-opening wall 6, and at two locations that vertically divide the non-opening wall 6 into three equal parts.

Moreover, in addition to the configuration of FIG. 10A, FIG. 10B shows that the beam 2
A cylindrical body 4' is also installed at the joint portion between the cylindrical member 4 and the non-opening wall 6.

Therefore, when this frame is subjected to shear force during an earthquake,
For example, as shown in Fig. 6, the installation site of the cylinder 4 is crushed, causing longitudinal slip fracture, and at the same time, the installation site of the trap cylinder 4' is also crushed, causing concrete to protrude and collapse, resulting in no opening. The existence of wall 6 can be ignored (it can be treated as a non-structural member), and the behavior approaches that of a pure Ramen open frame.

[Brief explanation of drawings]

Figures 1 and 2 and Figures 4 to 6 are explanatory diagrams showing the destruction and deformation of RC frames with rough walls of different shapes, Figure 3 is a sectional view showing the conventional joint structure, and Figure 7 Figures A, B and Figures 9 and 10A. FIG. 10 is an explanatory view showing the RC frame according to the invention of the B-cigarette, and is a sectional view showing the joint structure. Inventor Hideyuki Iwase Inventor Takashi Asana Inventor Toru Ogawa Inventor Ikuo Yamaguchi Applicant Takenaka Corporation Representative Patent Attorney Yuji Takabe MlliiQ 2fiiQ C Figure 3 Figure 4 Figure 7A Figure 7 B Figure 8 Figure 9 Figure 10 A Figure 10 B Commissioner of the Japan Patent Office Kazuo Wakasugi 1, Indication of the case 1982 Patent No. 14473382, Issue 11D
Name Reinforcement bar w: yp, )-) Reinforcement bar with remains 3, Relationship with the case of the person making the amendment Patent applicant address 4-27 Honmachi, Higashi-ku, Osaka-shi Kasei Name name)
Mononaka Construction Co., Ltd. 4, Agent 103 6, Number of inventions increased by amendment 8, Contents of amendment (1) Page 1 O, line 12 of the specification is amended as follows. "Figure 8 is a sectional view showing the main parts of the frame according to the present invention."

Claims (2)

[Claims] (1) In a reinforced concrete frame with miscellaneous walls in which waist walls, sagging walls, sleeve walls, etc. are attached to columns and beams in the frame plane, a cylindrical body is installed at the center of the cross-sectional inner path of the joint between the wall plate and the column. A reinforced concrete frame with rough walls that is characterized by being installed. (2) In reinforced concrete frames with miscellaneous walls in which waist walls, leaning walls, sleeve walls, etc. are attached to columns and beams in the frame plane, the center of the cross-sectional inner path of the joint between the wall plate and the columns and beams; A reinforced concrete frame with rough walls, characterized in that a cylindrical body is installed at a predetermined position in the center of a section of the wall plate as required.