JPS62163887A - Edge part installation structure for girder - Google Patents

Abstract

PURPOSE:To suppress the generation of the reduction of effective area, stress concentration, and welding deterioration by forming an opened port onto other structural members at the arcuate projection edge part of a girder for a vessel, etc. and fitting the top edge of a surface member into the opened port and setting the surface of a structural member and the surface of the surface member on an equal plane and butt-welding the joint edges of the both members. CONSTITUTION:The lower edge of a girder G is installed onto the upper surface of a floor plate 3. Therefore, the projection of a surface member 2 onto the floor plate 3 at the welded part in the conventional is prevented, and the effective area at this part is increased. Further, since a part of the floor plate 3 is formed integrally with the surface member 2 by an opened port 5, the discontinuous part in structure is removed, and the butt-welding 6 can be executed easily and certainly, and the deterioration of welding due to the stress concentration and the welding at the discontinuous part is prevented.

Description

[Detailed description of the invention] [Industrial application field] The present invention is applicable to girders of steel structures, especially longitudinal ships.

Concerning the end mounting structure of horizontal and vertical girders.

[Conventional technology]

Conventionally, in a steel structure such as a ship, the attachment shape of a girder consisting of a web and a face material attached directly to the edge of the web and other structural members is, for example, a girder G as shown in the perspective view of Fig. 3. ′
The lower end edge of the web 1' of the girder G' is the upper surface of the floor plate 3', and in order to alleviate the stress concentration, a fully overhanging part GO' of the web 1' of the girder G' is formed as shown in the partially enlarged view of FIG. It has a shape that follows the floorboard 3'. However, the facing material 2'
At the tip of the floor plate 2', the panel 2' and the floor plate 3' are not connected, and a structural discontinuity exists.

In order to minimize the stress generated at this structural discontinuity, as shown in the fifth factor diagram, the width of the facing material 2' gradually decreases from 1' to bgND' toward the tip.
On the contrary, the depth dv' of the web 1' must be gradually increased as shown in FIG. Usually, this web 1' has a gradually increasing depth overhang Go' F1 in the form of an arc, and in that case, it is customary to extend it to such an extent that the tip of the face material 2' is parallel to the floor material 3'. Yes, the depth of the web 1' end at this time ""ND' = dw'-1-R: (arc diameter) + α
(tip welded part).

However, in such a structure, a protrusion consisting of the web 1' and the face material 2' is formed on the floor plate 3' up to dEND', making it difficult to use that part as an effective area for loading cargo, etc. Since there are welds at the tips of 1' and face plate 2', this gradually increasing overhang has the problem of not only stress concentration due to structural discontinuity, but also the negative effects of residual stress due to welding and a decrease in fatigue strength due to welding. arise.

[Problem that the invention seeks to solve]

The present invention was proposed in view of these circumstances, and
Reduction of the effective area due to the protrusion of the arcuate end of the girder;
It is an object of the present invention to provide a girder end attachment structure that can prevent stress concentration and welding deterioration due to structural discontinuity.

[Means for solving problems]

To that end, the present invention provides an arrangement in which the arcuate overhanging end of a girder consisting of a web and a face material attached directly to the edge of the web is attached to another structural member by opening an opening in the other structural member. and fitting the tip of the face material into the opening to position the surface of the structural member and the surface of the face material on the same plane,
It is characterized by butt welding the joining edges of both materials.

[Effect]

The above configuration expands the effective space used for cargo loading and other purposes, and eliminates discontinuities and welding in those areas, resulting in no stress concentration, which also reduces the negative effects of residual stress and fatigue due to welding. A decrease in strength can be prevented.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing the end attachment structure of the girder, and FIG. 2 is an enlarged side view of the leg portion taken along line 1--2 in FIG.

In FIGS. 1 and 2, the same symbols as in FIGS. 3 to 5 indicate the same members as in FIGS. Digit G is
Its lower edge is on the upper surface of the floorboard 3. Therefore, an opening 5 of an appropriate size is provided in the floor plate 3 that is in contact with the arcuate overhanging end Go of the girder G, and the lower end of the face plate 2 is fitted into the opening 5, so that the surface of the face plate 2 and the surface of the floor plate 3 are and are positioned on the same plane, and the leading edge of the panel 2 is connected to the edge of the opening 5 of the floorboard 3 by a butt weld 6.

In this way, the lower edge of the girder G is attached to the floor plate 3, so
Unlike in the past, the face plate 2 does not protrude above the floor plate 3 at the welded part, so the effective area in this area is expanded, and a part of the floor plate 3 is integrated with the υ face plate 2 through the opening 5. As the shape becomes like this, there are no structural discontinuities,
Butt welding 6 can also be performed easily and reliably, and stress concentration and weld failure caused by discontinuous welding are prevented.

〔Effect of the invention〕

In short, according to the present invention, the arcuate overhanging end of the girder consisting of the web and the face member attached orthogonally to the edge thereof is attached to the other structural member by providing an IC opening in the other structural member. , by fitting the tip of the above-mentioned face material into the opening and positioning the surface of the above-mentioned structural member and the surface of the above-mentioned face material on the same plane, and then butt-welding the joining edges of both materials, it is possible to carry out cargo loading, etc. The effective space used for the process is expanded, and the discontinuity and welding at that part are eliminated.As a result, there is no stress concentration, and the adverse effects of residual stress due to welding and a decrease in fatigue strength can be prevented. is extremely useful for industry.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an embodiment of the girder end mounting structure of the present invention, Fig. 2 is a side view taken along the line ■-■ in Fig. 1, and Fig. 3 is a conventional girder end mounting structure. FIG. 4 is an enlarged view of the section ``■'' in FIG. 3, and FIG. 5 is a plan view taken along the line ``---'' in FIG. 4. G... Girder, Go... Arc-shaped overhanging end, 1... Web, 2... Face material, 3... Floor material, 5... Opening, 6
...Butt welding, sub-agent and patent attorney Tadashi Tsukamoto Figure 1 Figure 2

Claims (1)

[Claims] An opening is provided in the other structural member at the attachment point between the arcuate end of the girder consisting of a web and a face plate attached perpendicularly to the edge of the girder and another structural member, and an opening is provided in the other structural member, and the opening is filled with the face plate. A structure for attaching an end of a girder, characterized in that the tip is fitted so that the surface of the structural member and the surface of the face material are located on the same plane, and the joining edges of both materials are butt welded.