JP2000318676A - Through hole shape of reinforcing member in structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a through hole shape so as to reduce generation of stress concentration. SOLUTION: A shape of a thruogh hole 4 when a longitudinal member 2 of a T-shaped cross section is penetrated through a transverse-member 3 to be arranged is constituted to have the first circular arc face 11 of a large radius formed to surround a side and an upper side of a flange part 2a of the longitudinal member 2, and the second paired left and right circular arc faces 12 of a small radius formed on the lower side of the flange part 2a of the longitudinal member and in both side positions of web part 2b, to position the center O1 of the first circular arc face 11 in the center of the flange part 2a, and to position the centers O2 of the respective second circular arc faces 12 on straight lines S in parallel to a surface of the web 2b separated respectively from the web part 2b by a half of a radius R of the first circular arc face 11, and in a position to inscribe the respective second circular arc faces 12 to the first circular arc face 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a reinforcing member provided between a hull plate and a hull outer plate in a double hull structure, for example, a long member penetrating another reinforcing member such as a transformer member. The shape of the through hole at the time.

[0002]

2. Description of the Related Art Recently, in large tankers and the like,
A double hull structure is adopted. The hull structure in this double hull structure is such that the hull plates are arranged inside the hull outer plate at a predetermined interval, and the opposing surfaces between these two plates and a large number of Are provided.

For example, as shown in FIG. 6, at the bottom of the hull, a plurality of T-shaped longitudinal members having a T-shaped cross section are provided at predetermined intervals in the width direction of the hull, on the lower surface of the inner bottom plate 51 and the upper surface of the outer bottom plate 52. 53 are provided in the bow and tail directions, respectively, and between the bottom inner plate 51 and the bottom shell 52, a plurality of flat transformer members 54 are provided at predetermined intervals in the bow and tail direction in the boat width direction. Is provided.

In installing the transformer member 54, a notch or through hole 54a is formed to allow the flange portion 53a of each of the long members 53 to move, and the shape of the through hole 54a is changed. In order to avoid the occurrence of stress concentration as much as possible, the shape is, for example, elliptical.

[0005]

As described above, the shape of the through hole 54a for allowing the long material 53 formed in the transformer material 54 to penetrate is temporarily made to be an oval shape. There is a possibility that stress concentration may occur from the connection point of the material 53 to the web portion 53b to the arc-shaped portion.

Accordingly, an object of the present invention is to provide a through hole shape of a reinforcing member in a structure capable of further reducing the occurrence of stress concentration.

[0007]

In order to solve the above-mentioned problems, the through-hole shape of the reinforcing member in the structure of the present invention is as follows.
When attaching a plate-shaped first reinforcing member and a second reinforcing member having a T-shaped cross section, which is disposed so as to penetrate through the first reinforcing member and has a flange portion connected to an upper end of a web portion, to the plate body. A first arc surface having a large radius formed so as to surround a side and an upper side of a flange portion of the second reinforcement member;
A pair of left and right small-radius second arc surfaces formed below the flange portion of the reinforcing member and at both sides of the web portion, and the center of the first arc surface is aligned with the flange portion of the second reinforcing member. And the center of each second arc surface is positioned on a straight line parallel to the surface of the web portion, which is separated from the web portion of the second reinforcing member by half the radius of the first arc surface, respectively. In addition, these second arc surfaces are located at positions inscribed in the first arc surface.

According to the above configuration, the shape of the through hole for allowing the first reinforcing member to penetrate the second reinforcing member is such that the through-hole has a large radius at the first arc surface and a position below the flange portion of the first arc surface. Since it is formed by the two second arc surfaces having a small radius in contact with the first arc surface, the inner peripheral surface of the through hole is
It has a smooth curved surface shape over almost the entire length, and thus the occurrence of stress concentration is reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The shape of a through hole of a reinforcing member in a structure according to an embodiment of the present invention will be described below with reference to FIGS. As a structure in the present embodiment, for example, a ship bottom portion such as a tanker adopting a double hull structure will be described.

As shown in FIGS. 1 and 2, a hull plate (not shown) constituting a double hull structure at the bottom of the hull.
A plurality of longitudinal members (second reinforcing members) 2 having a T-shaped cross section are provided at predetermined intervals in the ship width direction on the surface opposing the hull outer plate (plate) 1, that is, the lower surface and the upper surface 1a. A plurality of flat-shaped transformer members (first reinforcing members) 3 are provided at predetermined intervals in the bow and stern direction between the hull plate and the hull skin 1, respectively. The through-hole in the transformer material 3 of each longitudinal material 2 is formed with a through-hole 4 so as to allow the longitudinal material 2 to move, and the shape of the through-hole 4 is formed. Is an arc surface having a large radius surrounding the entire flange portion 2a of the long material 2 and the flange portion 2a.
And two arcuate surfaces having a small radius so as to surround both sides of the web portion 2b.

That is, the through hole 4 mainly has a first circular arc surface 11 having a large radius R which wraps the entire upper portion from the side of the flange portion 2a, and a lower side of the flange portion 2a and both sides of the web portion 2b. A bottom portion formed by joining two second arc surfaces 12 having a small radius r so as to surround the portion has a round heart shape. More specifically, the first arc surface 11 is an arc-shaped inner peripheral surface having a radius R centered on a center position O _{1 of the} upper end of the web portion 2b of the longitude material 2, that is, a connection position with the flange portion 2a. The center position O _{2 of} the second circular arc surface 12 is located on a straight line S parallel to the surface of the web portion 2b at a position below the flange portion 2a and away from the center of the web portion 2b by R / 2. And at a position in contact with the inner peripheral surface of the first circular arc surface 11.

To explain geometrically, the inner peripheral surface of the through hole 4 has a first circular arc surface 11 formed of about 約 of a circle having a radius R.
Are connected to one end of a second arc surface 12 which is about 1/3 of a circle having a radius r, and the other end of the second arc surface 12 and a web portion 2b close to the flange portion 2a. Is connected by a short straight line portion 13. It should be noted that the numbers indicating the arc surfaces 11, 12 and the straight portion 13 in FIG. 1 are marked by dimension lines indicating the respective ranges.

As described above, the inner surface of the through hole 4, which is a penetrating portion of the long material 2 with respect to the transformer material 3, is formed by the first circular surface 11 having a large radius and the first circular surface at a position below the flange portion of the first circular surface 11. Since the second circular arc surface 12 having a small radius in contact with the circular arc surface 11 is formed into a combined shape, the inner peripheral surface of the through hole 4 has a smooth shape by an arc-shaped curve over substantially the entire length, and therefore, the stress is reduced. The occurrence of concentration is reduced as much as possible.

FIG. 3 shows the finite element method analysis of the stress generated when a compressive load due to water pressure is applied to the through hole 4 according to the present embodiment, and shows the web portion below the flange portion 2a. 17. In a portion having a large curvature close to 2b,
A tensile stress of about 2 kg / mm ² is generated, and a compressive stress of about 17.5 kg / mm ² is generated in a small curvature near both sides of the flange portion 2a.

FIG. 4 shows, as a comparative example, an analysis value of a stress generated when a load is applied to the oval through hole 4A shown in the conventional example by the finite element method. 20.4 in the straight section near the lower web section 2b
A tensile stress of about kg / mm ² is generated, and a compressive stress of about 26.6 kg / mm ² is generated in an arc portion near both sides of the flange portion 2a.

Further, FIG. 5 shows, as a comparative example, a stress generated when a load is applied to an apple-shaped through hole 4B obtained by connecting two elliptical arc portions to an oval hole. The analysis value by the finite element method is shown. In the portion where the curvature is large near the web portion 2b below the flange portion 2a, 19.
A tensile stress of about 0 kg / mm ² is generated, and a compressive stress of about 19.6 kg / mm ² is generated in a small curvature near both sides of the flange portion 2a.

As described above, the through hole 4 according to the present embodiment
It can be clearly seen that the stress generated in the comparative example is smaller than that in the comparative example. By the way, in each of the above embodiments,
Although the structure applied to the hull having the double hull structure has been described, the invention is not limited to this. The plate-shaped first reinforcing member of another structure may have a T-shaped cross section. The present invention can be applied to the shape of a through hole formed in the first reinforcing member when the second reinforcing member having the shape is provided so as to penetrate vertically. That is, the arrangement state of the second reinforcing member is not limited.

[0018]

As described above, according to the configuration of the present invention, the shape of the through hole for allowing the first reinforcing member to penetrate the second reinforcing member is changed to the first arc surface having a large radius and the first arc surface. Since the inner peripheral surface of the through hole is formed to have a smooth shape over substantially the entire length by being formed by the two second arc surfaces having a small radius and being in contact with the first arc surface at a position below the flange portion, the stress is reduced. The occurrence of concentration can be further reduced.

[Brief description of the drawings]

FIG. 1 is a front view of a through hole of a reinforcing member according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a diagram showing stress generated in a through hole in the present embodiment.

FIG. 4 is a diagram showing stress generated in a through hole of a comparative example.

FIG. 5 is a diagram showing stress generated in a through hole of a comparative example.

FIG. 6 is a front view showing a through hole of a reinforcing member in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ship bottom inner plate 2 Longitude material 2a Flange part 2b Web part 3 Transformer material 4 Through hole 11 1st circular surface 12 Second circular surface 13 Straight line

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Jin Tobita 1-7-89 Minami Kohoku, Suminoe-ku, Osaka-shi, Osaka Inside Hitachi Zosen Corporation (72) Inventor Kimio Kondo 1-chome Minami-Kohoku, Suminoe-ku, Osaka-shi, Osaka 7-89 Inside Hitachi Zosen Corporation (72) Inventor Kamei Former 1-7-89 Inside Hitachi Zosen Corporation (72) Inventor Toshio Yoshioka Minami Suminoe-ku, Osaka-shi, Osaka 1-7-89 Kohoku Hitachi Zosen Corporation

Claims (1)

[Claims] 1. A first reinforcing member having a plate shape and a second reinforcing member having a T-shaped cross section, which is disposed so as to penetrate through the first reinforcing member and has a flange portion connected to an upper end of a web portion. A first arc surface having a large radius formed so as to surround a side portion and an upper side of a flange portion of the second reinforcement member when the first reinforcement member is attached to a plate body; And a pair of left and right small radius second arc surfaces formed below the flange portion of the second reinforcing member and at both sides of the web portion, and the center of the first arc surface is subjected to the second reinforcement. It is located at the center of the flange portion of the member, and the center of each second arc surface is set at one radius of the radius of the first arc surface from the web portion of the second reinforcing member.
Characterized in that the reinforcing members are penetrated on a straight line parallel to the surface of the web portion and separated from each other by a distance of / 2 such that each of the second arc surfaces is inscribed in the first arc surface. Hole shape.