RU2486096C1 - Side bulkhead - Google Patents

Abstract

FIELD: transport.

SUBSTANCE: invention relates to ship building and may be used in construction and repair of ship sides. Side bulkhead comprises skin, joists, flexible bar, strip above joist and strengthening elements. Strengthening elements connect strips of joists with the bases of adjacent joists. Said joist are supported by reactive forces of the skin and flexible bar provided with strip to rest on strengthening elements that allows incorporating skin, flexible bar and strengthening elements with elastoplastic support of the bars.

EFFECT: higher bearing capacity of joists.

3 dwg

Description

The invention relates to the field of shipbuilding and can be used in the construction and repair of airborne hull structures.

Known side cover of the vessel containing the lining and beams of the transverse set (Barabanov N.V. The design of the hull of sea vessels. L., Shipbuilding, 1981. - 552 S., S. 42-43, Figure 8 "a").

The disadvantage of this overlap is the low strength and blockage of the set beams during the perception of intense local loads, which are the main cause of damage.

Known side overlap of the vessel containing the lining, beams of transverse set, beams of longitudinal set (Barabanov N.V. The design of the hull of sea vessels. L., Shipbuilding, 1981. - 552 S., S. 42-43, figure 8 "d") .

The design of this overlap has the following disadvantages:

- under the action of intense locally distributed loads (ice, loads from fenders), the bearing capacity of the set beams is often exhausted;

- during the formation of dents, blockage of the set beams can occur, which significantly reduces the bearing capacity of the overlap.

As the closest analogue, a reinforcement unit for the deformed section of the ship's overlay was adopted (Author's certificate No. 1615032, IPC B63B 9/00, B63B 3/26, publ. 12/23/1990), containing sheathing or flooring, set beams and reinforcing elements welded to the set beams and each reinforcing element is welded in the middle part of the length to the shelf of the reinforced beam of the set, and ends are welded to the bases of the walls of adjacent beams.

This design has a significant drawback in that, due to the low flexibility of the reinforcing elements, the kit beam is supported mainly by reactions from their side, and the support forces from the sheathing are insignificant. With the perception of intense local loads, this leads to overloading of the reinforcing elements and their destruction, which reduces the bearing capacity of the beams of the set and overlap as a whole.

The invention solves the problem of increasing the bearing capacity of the set beams and the reliability of the reinforcing elements due to the simultaneous inclusion of support forces from the reinforcing elements and the casing in the work.

To solve this problem, in the well-known side deck of the vessel, consisting of sheathing, set beams, reinforcing elements connected to the set beams, it is proposed to install an elastic beam equipped with a strip on the shelves of the set, and to connect the strip of the corresponding set beam with the bases of the walls adjacent to each of the reinforcing elements her beams set.

In the proposed technical solution, the set beams, which are subject to the operational load, are supported by reactions from the sheathing and the elastic beam provided with a strip connected to the reinforcing elements, so that the load that the frame can absorb before the kinematically variable mechanism is formed in it increases compared to the design of the closest analogue, and the stress level in the reinforcing elements is reduced.

The attached graphic materials show:

figure 1 - General view of the overlap;

figure 2 is a section aa in figure 1;

figure 3 - curves of the bearing capacity of the reinforced beams of the set.

The following notations are used on graphic materials:

1 - sheathing;

2 - set beam;

3 - reinforcing element;

4 - elastic beam;

5 - strip;

A - curve corresponding to the proposed design;

B - curve corresponding to the construction of the closest analogue;

P ₂₀ is the load corresponding to the formation of a kinematically variable mechanism in the set beam without the installation of reinforcing elements;

P ₂ is the load corresponding to the formation of a kinematically variable mechanism in the set beam after the installation of reinforcing elements;

- нагрузка, соответствующая образованию кинематически изменяемого механизма в балке набора после установки подкрепляющих элементов в безразмерном виде; $${\overline{P}}_2=P_2/P_{\mathrm{twenty}}$$

- the load corresponding to the formation of a kinematically variable mechanism in the set beam after installing the reinforcing elements in a dimensionless form;

a - transverse overlap;

b is the distance between the reinforcing elements;

- отношение расстояния между подкрепляющими элементами к поперечной шпации перекрытия. $$\overline{b}=b/a$$

- the ratio of the distance between the reinforcing elements to the transverse spacing of the floor.

The design of the side overlap consists of a casing 1 with the beams of set 2 installed on it, reinforcing elements 3, connected to the strip 5, which is equipped with an elastic beam 4, mounted on the shelves of the beams of the set.

Side overlap works as follows. The external intense locally distributed load is perceived by the beam of set 2, which lies on some elastic-plastic base, the role of which is the skin 1, the reinforcing elements 3 and the elastic beam 4. To determine the parameters of the elastic-plastic base of the beam of the set, the calculation of the beam-strip sheathing is performed in accordance with (Burakovsky P.E. Accounting for the stiffness of the casing during the deformation of the connections of shipboard ceilings, perceiving intense local loads // Proceedings of the Central Research Institute named after academician A.N. Krylov. - St. Petersburg, 2008. - Issue 41 (325). - S.157-170). After this, the force-deflection dependence is obtained for the reinforcing elements loaded with concentrated force, for a sufficiently large number of which their action on the set beam can be represented not as concentrated forces, but as a reaction of some elastic-plastic base. Next, the stiffness coefficient of the base created by the elastic beam is determined, and according to (Arkhangorodsky A.G., Belenky L.M., Litvin A.B. Crumpled gaskets in shipbuilding and ship repair. - L .: Shipbuilding, 1966. - 132 p.) The integral stiffness of the base created by the reinforcing elements and the elastic beam is calculated. Thus, the set beam can be considered as a beam lying on an elastic-plastic base, the stiffness parameters of which correspond to the simultaneous action of the support forces on the side of the sheathing and the base side with some integral stiffness, the role of which is played by reinforcing elements and an elastic beam . By changing the parameters of the installed reinforcing elements and the elastic beam, it is possible to achieve the required increase in the bearing capacity of the set beams. The analysis shows that in the proposed design the bearing capacity of the set beams is higher than in the structure of the closest analogue, which is due to the simultaneous use in the proposed design of the support forces of both reinforcing elements with an elastic beam and the sheathing plates. Figure 3 shows the curves corresponding to the bearing capacity of the set beams, reinforced according to the design of the closest analogue (curve "B") and the proposed design (curve "A"). The curves presented are constructed for reinforcing elements with a cross-sectional area of 0.001 m ² and an elastic beam with a cross-section of 0.06 m × 0.06 m, a cross-section of the floor a = 0.6 m. It can be seen that the bearing capacity of the set beams in the proposed design is higher by 20 % than in the design of the closest analogue. In addition, the use of an elastic beam avoids overloading and destruction of the reinforcing elements, since the material and the cross-section of the beam can be selected so that the flow of its material begins earlier than the longitudinal force in the reinforcing elements reaches its limit value.

Claims (1)

An airborne floor consisting of sheathing, set beams, reinforcing elements connected to the set beams, characterized in that an elastic beam equipped with a strip is installed on the set shelves, and each reinforcing element connects the strip of the corresponding set beam with the bases of the walls of the set beams adjacent to it.

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