CN110979550A - Ship bulkhead toe end structure and design method thereof - Google Patents
Ship bulkhead toe end structure and design method thereof Download PDFInfo
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- CN110979550A CN110979550A CN201910527612.9A CN201910527612A CN110979550A CN 110979550 A CN110979550 A CN 110979550A CN 201910527612 A CN201910527612 A CN 201910527612A CN 110979550 A CN110979550 A CN 110979550A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B3/00—Hulls characterised by their structure or component parts
- B63B3/14—Hull parts
- B63B3/56—Bulkheads; Bulkhead reinforcements
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Abstract
The invention relates to a toe end structure of a ship bulkhead and a design method thereof, wherein the toe end structure comprises a radian plate, a first panel flat steel and a second panel flat steel, the radian plate comprises an arc edge and an arc connecting plate, and the arc connecting plate comprises a first horizontal edge, a first vertical edge, a second vertical edge and a second horizontal edge; the second vertical edge is respectively and vertically connected with the first horizontal edge and the second horizontal edge, and the arc edge is connected with the first vertical edge and the second horizontal edge and is sunken towards the arc connecting plate; the first panel flat steel is welded and fixed close to the arc edge, and is arranged on a section of arc of which the arc edge is projected in the vertical direction; one end of the first panel flat steel is a sharpened first bevel structure, and the included angle of the end part of the first bevel structure is an acute angle. According to the invention, the two sections of panel flat steel are arranged on the radian plate, the end part of the panel flat steel at the bottom is beveled, and the thickness of the panel flat steel at the bottom is smaller than that of the panel flat steel at the top, so that the stress concentration phenomenon at the toe end of the radian plate is eliminated, and the service life of the toe end of the radian plate is prolonged.
Description
Technical Field
The invention relates to the technical field of ship design and construction, in particular to a ship bulkhead toe end structure and a design method thereof.
Background
At present, the structure of the ship bears larger stress force due to the combined action of self gravity, wave load and various dynamic acceleration in the sailing process. When a ship structure is designed and built, due to arrangement requirements, phenomena such as bulkhead or platform plate termination in a high stress area are inevitably generated frequently, so that stress concentration phenomena at the toe end of the structure are caused, the design fatigue life of the toe end node is low, and cracks are easily generated in the operation process. To reduce stress concentrations at the toe end of the marine structure, it is common practice to provide insert plates at the ends of the structure, the insert plates typically being thicker than the surrounding body structure, possibly with circular arcs and the arc edges being weldable to flat steel. This conventional toe end node design reduces stress concentrations to some extent, but still has stress concentrations at the curved free edges and at the toe ends of the insert plates. Cracks are still easily produced when the nodes are in more stressed positions, such as in midship distances of the ship's hull and at more remote positions on the axis. In particular, the fatigue life of the insert plate toe end and fillet weld design at the flat steel stop is not easily satisfactory.
Disclosure of Invention
The invention aims to solve the problem of stress concentration at the toe end of the existing inserted arc plate and provide a ship bulkhead toe end structure and a design method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a toe end structure of a ship bulkhead comprises a radian plate, a first panel flat steel and a second panel flat steel, wherein the radian plate comprises an arc edge and an arc connecting plate integrally connected with the arc edge, and the arc connecting plate comprises a first horizontal edge, a first vertical edge, a second vertical edge and a second horizontal edge; the first horizontal edge is above the second horizontal edge, and the length of the first horizontal edge is smaller than that of the second horizontal edge; the first vertical side is perpendicular to the first horizontal side, the second vertical side is respectively perpendicular to the first horizontal side and the second horizontal side, and the length of the first vertical side is smaller than that of the second vertical side; the arc edge is connected with the first vertical edge and the second horizontal edge and is sunken towards the arc connecting plate; the first panel flat steel is tightly attached to the arc edge and welded and fixed, and the first panel flat steel is arranged on a section of arc of which the projection of the arc edge is close to in the vertical direction; one end of the first panel flat steel is a sharpened first bevel structure, the included angle of the end part of the first bevel structure is an acute angle, the edge of the first bevel structure is close to the position where the arc edge and the first vertical edge are intersected, and the other end of the first panel flat steel is not subjected to bevel treatment; the second panel flat steel is welded and fixed on an arc at one end of the arc edge, which is lower than the projection of the arc edge in the vertical direction; the included angle between the second panel flat steel and the second horizontal edge in the vertical direction is theta 1; one end of the second panel flat steel is close to the end, which is not chamfered, of the first panel flat steel, the other end of the second panel flat steel is subjected to chamfering treatment to form a second chamfering structure, the included angle of the end part of the second chamfering structure is an acute angle theta 2, the distance from the end part of the second chamfering structure to the second horizontal side in the horizontal direction is c, and the distance from the end part of the second chamfering structure to the second horizontal side in the vertical direction is d; a plate seam is reserved at the joint of the second panel flat steel and the first panel flat steel on the arc edge, and the plate seam is positioned below one half of the height of the arc edge in the vertical direction; the thickness of the second panel band is less than the thickness of the first panel band, and the width of the first panel band is the same as the width of the second panel band.
Specifically, the length of the second horizontal side is a, the height of the second vertical side is b, and b > a, the value range of a is 310mm-1030mm, and the value range of b is 370mm-1340 mm;
the radius of the first panel flat steel is R1, the radius of the second panel flat steel is R2, R1 is smaller than R2, the numerical range of R1 is 300mm-1000mm, and the numerical range of R2 is 301mm-1500 mm; the distance between the projection of the plate seam in the horizontal direction and the end part of the second beveling structure is L; the numerical range of L is 200mm-1000 mm; the value of c is 10mm-40mm, and the value of d is 10mm-30 mm. Said θ 2 ranges in value from 5 ° to 30 °; the value of θ 1 ranges from 5 ° to 25 °.
A method of designing a toe end structure of a bulkhead of a marine vessel, the method comprising the steps of:
firstly, welding and fixing an arc connecting plate of a radian plate in a ship high stress area, and performing stress analysis on the structural strength of a first panel flat steel and a second panel flat steel through software to obtain the stress value of a toe portion of the second panel flat steel S1;
secondly, increasing the thickness of the second panel flat steel by 20-30% each time, and analyzing the stress value of the second panel flat steel to be S2 through software;
finally, comparing the S2 with the S1,
if the S2 is 30% -60% of the S1, stopping increasing the thickness of the second panel flat steel to finish the design;
if the S2 is not within the range of 30% -60% of the S1, continue increasing the second panel flat thickness, continue stress testing analysis by software until the S2 is 30% -60% of the S1.
A method of designing a toe end structure of a bulkhead of a marine vessel, the method comprising the steps of:
firstly, welding and fixing an arc connecting plate of a radian plate in a ship high stress area, and performing stress analysis on the structural strength of a first panel flat steel and a second panel flat steel through software to obtain the stress value of a toe portion of the second panel flat steel S3;
secondly, increasing the radius R2 of the second panel flat steel, increasing 5-10% of the radius R2 of the second panel flat steel each time, and analyzing the stress value of the second panel flat steel to be S4 through software;
finally, comparing the S4 with the S3, if the S4 is 30% -60% of the S3, ending increasing the radius of the second panel flat steel, completing the design;
if the S4 is not within the range of 30% -60% of the S3, the radius of the second panel flat is continuously increased, and the stress test analysis by software is continuously performed until the S4 is 30% -60% of the S3.
A method of designing a toe end structure of a bulkhead of a marine vessel, the method comprising the steps of:
firstly, welding and fixing an arc connecting plate of a radian plate in a ship high stress area, and performing stress analysis on the structural strength of a first panel flat steel and a second panel flat steel through software to obtain the stress value of a toe portion of the second panel flat steel S5;
secondly, reducing the end part chamfering angle theta 2, wherein the angle of the end part chamfering angle theta 2 is reduced by 1-2 degrees each time, and analyzing the stress value of the second panel flat steel to be S6 through software;
finally, comparing the S6 with the S5,
if the S6 is 30% -60% of the S5, ending reducing the end chamfer angle theta 2, and completing the design;
if the S6 is not within the range of 30-60% of the S5, the reduction of the end chamfer angle θ 2 is continued, and the stress test analysis by software is continued until the S6 is 30-60% of the S5.
A method of designing a toe end structure of a bulkhead of a marine vessel, the method comprising the steps of:
firstly, welding and fixing an arc connecting plate of a radian plate in a ship high stress area, and performing stress analysis on the structural strength of a first panel flat steel and a second panel flat steel through software to obtain the stress value of a toe portion of the second panel flat steel S7;
secondly, increasing the thickness of the second panel flat steel by 10-15% each time;
increasing the radius R2 of the second panel flat, each time by 3-5% of the radius R2,
analyzing the stress value of the second panel flat steel by software to be S8;
finally, comparing the S8 with the S7,
if the S8 is 30% -60% of the S7, terminating the increase of the thickness of the second panel flat steel and the radius R2 of the second panel flat steel, completing the design;
if the S8 is not within the range of 30% -60% of the S7, the second panel flat thickness and the second panel flat radius R2 continue to be increased, and the stress test analysis continues to be performed by the software until the S8 is 30% -60% of the S7.
A method of designing a toe end structure of a bulkhead of a marine vessel, the method comprising the steps of:
firstly, welding and fixing an arc connecting plate of a radian plate in a ship high stress area, and performing stress analysis on the structural strength of a first panel flat steel and a second panel flat steel through software to obtain the stress value of a toe portion of the second panel flat steel S9;
secondly, increasing the thickness of the second panel flat steel by 10-15% each time;
reducing the end part chamfering angle theta 2, wherein the end part chamfering angle theta 2 is reduced by 1 degree every time, and analyzing the stress value of the second panel flat steel to be S10 through software;
finally, comparing the S10 with the S9,
if the S10 is 30% -60% of the S9, stopping increasing the thickness of the second panel flat steel and reducing the end chamfer angle theta 2 to complete the design;
if the S10 is not within the range of 30% -60% of the S9, continue increasing the second panel flat thickness and decreasing the end chamfer angle θ 2, continue the stress test analysis by software until the S10 is 30% -60% of the S9.
A method of designing a toe end structure of a bulkhead of a marine vessel, the method comprising the steps of:
firstly, welding and fixing an arc connecting plate of a radian plate in a ship high stress area, and performing stress analysis on the structural strength of a first panel flat steel and a second panel flat steel through software to obtain the stress value of a toe portion of the second panel flat steel S11;
secondly, increasing the radius R2 of the second panel flat steel, and increasing 3% -5% of the radius R2 of the second panel flat steel each time;
reducing the end part chamfering angle theta 2 by 1 degree every time;
analyzing the stress value of the second panel flat steel by software to be S12;
finally, comparing the S12 with the S11,
if the S12 is 30% -60% of the S11, terminating the increasing of the second panel band steel radius R2 and the decreasing of the end chamfer angle theta 2, completing the design;
if the S12 is not within the range of 30-60% of the S11, continuing to increase the second panel band radius R2 and decrease the end chamfer angle θ 2, continuing to perform stress test analysis by software until the S12 is 30-60% of the S11.
A method of designing a toe end structure of a bulkhead of a marine vessel, the method comprising the steps of:
firstly, welding and fixing an arc connecting plate of a radian plate in a ship high stress area, and performing stress analysis on the structural strength of a first panel flat steel and a second panel flat steel through software to obtain the stress value of a toe portion of the second panel flat steel S13;
secondly, increasing the thickness of the second panel flat steel by 8-10% each time,
increasing the second panel flat radius R2 by 2% -3% of the second panel flat radius R2 each time; the end portion chamfering angle theta 2 is reduced, and every time the end portion chamfering angle theta 2 is reduced by 1 degree,
analyzing the stress value of the second panel flat steel by software to be S14;
finally, comparing the S14 with the S13,
if the S14 is 30% -60% of the S13, terminating the increasing of the second panel band steel radius R2 and the decreasing of the end chamfer angle theta 2, completing the design;
if the S14 is not within the range of 30-60% of the S13, continuing to increase the second panel band radius R2 and decrease the end chamfer angle θ 2, continuing to perform stress test analysis by software until the S14 is 30-60% of the S13.
The design idea of the invention is as follows: the stress concentration position is obtained by carrying out finite element analysis on the conventional design, the plate seam is arranged at the downward position close to the stress concentration position, and the finite element analysis is carried out by adjusting the parameters of the flat steel of the second panel until the stress at the toe end of the second panel is reduced to 30-60% of the stress value of the conventional design.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, the two sections of panel flat steel are arranged on the radian plate, the end part of the panel flat steel at the bottom is beveled, and the thickness of the panel flat steel at the bottom is smaller than that of the panel flat steel at the top, so that the stress concentration phenomenon at the toe end of the radian plate is eliminated, and the service life of the toe end of the radian plate is prolonged.
Drawings
Fig. 1 is a schematic view of the construction of the radian plate of the invention.
Fig. 2 is a schematic structural diagram of the present invention.
Fig. 3 is a side view of the present invention.
Fig. 4 is a top view of fig. 3 after cutting at a-a.
Fig. 5 is a state diagram of the use of the present invention.
Figure 6 is a graph of toe end stress values without the design method of the present invention.
Figure 7 is the toe end stress values after using the design method of the present invention.
In the figure: 10. a radian plate; 11. a circular arc edge; 12. a first horizontal edge; 13. a first vertical edge; 14. a second vertical edge; 15. a second horizontal edge; 16. splicing plates; 20. a first panel flat steel; 21. a first beveling structure; 30. a second panel flat steel; 31. a second beveling structure; 40. and (6) plate seam.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings.
A toe end structure of a ship bulkhead comprises a radian plate 10, a first panel flat steel 20 and a second panel flat steel 30, wherein the radian plate 10 comprises an arc edge 11 and an arc connecting plate integrally connected with the arc edge, and the arc connecting plate comprises a first horizontal edge 12, a first vertical edge 13, a second vertical edge 14 and a second horizontal edge 15; the first horizontal side 12 is above the second horizontal side 15, and the length of the first horizontal side 12 is smaller than that of the second horizontal side 15; the first vertical side 13 is perpendicular to the first horizontal side 12, the second vertical side 14 is perpendicular to the first horizontal side 12 and the second horizontal side 15 respectively, and the length of the first vertical side 13 is smaller than that of the second vertical side 14; the arc edge 11 is connected with the first vertical edge 13 and the second horizontal edge 15 and is recessed towards the arc connecting plate; the first panel flat steel 20 is tightly attached to the arc edge 11 and welded and fixed, and the first panel flat steel 20 is arranged on a section of arc on which the arc edge 11 is projected in the vertical direction; one end of the first panel flat steel 20 is a sharpened first beveling structure 21, an included angle of the end part of the first beveling structure 21 is an acute angle, the edge of the first beveling structure 21 is close to the intersection position of the circular arc edge 11 and the first vertical edge 13, and the other end part of the first panel flat steel 20 is not subjected to beveling treatment; the second panel flat steel 30 is welded and fixed on an arc at one end of the arc edge 11, which is lower in vertical projection; the included angle between the second panel flat steel 30 and the second horizontal edge 15 in the vertical direction is theta 1; one end of the second panel flat steel 30 is close to the non-chamfered end of the first panel flat steel 20, the other end of the second panel flat steel 30 is chamfered to form a second chamfered structure 31, an included angle of the end of the second chamfered structure 31 is an acute angle theta 2, a distance from the end of the second chamfered structure 31 to the second horizontal edge 15 in the horizontal direction is c, and a distance from the end of the second chamfered structure 31 to the second horizontal edge 15 in the vertical direction is d; a plate seam 40 is reserved at the joint of the second panel flat steel 30 and the first panel flat steel 20 on the circular arc edge 11, and the plate seam 40 is arranged below one half of the height of the circular arc edge 11 in the vertical direction; the thickness of the second panel flat 30 is less than the thickness of the first panel flat 20, and the width of the first panel flat 20 is the same as the width of the second panel flat 30.
Specifically, the length of the second horizontal side 15 is a, the height of the second vertical side 14 is b, and b > a, the value range of a is 310mm-1030mm, and the value range of b is 370mm-1340 mm;
the radius of the first panel flat steel 20 is R1, the radius of the second panel flat steel 30 is R2, the R1 is smaller than R2, the numerical range of R1 is 300mm-1000mm, and the numerical range of R2 is 301mm-1500 mm; the distance between the projection of the plate seam 40 in the horizontal direction and the end of the second beveling structure 31 is L; the numerical range of L is 200mm-1000 mm; the value of c is 10mm-40mm, and the value of d is 10mm-30 mm. Said θ 2 ranges in value from 5 ° to 30 °; the value of θ 1 ranges from 5 ° to 25 °.
The first embodiment of the design method of the invention:
a method of designing a toe end structure of a bulkhead of a marine vessel, the method comprising the steps of:
firstly, welding and fixing an arc connecting plate of a radian plate 10 in a ship high stress area, and then carrying out stress analysis on the structural strength of a first panel flat steel 20 and a second panel flat steel 30 through software to obtain the stress value S1 of the toe part of the second panel flat steel 30;
secondly, increasing the thickness of the second panel flat steel 30 by 20-30% of the thickness of the second panel flat steel 30 each time, and analyzing the stress value of the second panel flat steel 30 to be S2 by software;
finally, comparing the S2 with the S1,
if the S2 is 30% -60% of the S1, stopping increasing the thickness of the second panel flat steel 30, and completing the design;
if the S2 is not within the range of 30% -60% of the S1, the thickness of the second panel flat bar 30 continues to be increased, and the stress test analysis by software continues until the S2 is 30% -60% of the S1.
The second embodiment of the design method of the invention:
a method of designing a toe end structure of a bulkhead of a marine vessel, the method comprising the steps of:
firstly, welding and fixing an arc connecting plate of a radian plate 10 in a ship high stress area, and then carrying out stress analysis on the structural strength of a first panel flat steel 20 and a second panel flat steel 30 through software to obtain the stress value S3 of the toe part of the second panel flat steel 30;
secondly, increasing the radius R2 of the second panel flat 30 by 5% -10% of the radius R2 of the second panel flat 30 each time, and analyzing the stress value of the second panel flat 30 as S4 by software;
finally, comparing the S4 and the S3, if the S4 is 30% -60% of the S3, ending the increase of the radius of the second panel flat bar 30, completing the design;
if the S4 is not within the range of 30% -60% of the S3, the radius of the second panel flat 30 continues to be increased, and the stress test analysis by software continues until the S4 is 30% -60% of the S3.
The third embodiment of the design method of the present invention:
a method of designing a toe end structure of a bulkhead of a marine vessel, the method comprising the steps of:
firstly, welding and fixing an arc connecting plate of a radian plate 10 in a ship high stress area, and then carrying out stress analysis on the structural strength of a first panel flat steel 20 and a second panel flat steel 30 through software to obtain the stress value S5 of the toe part of the second panel flat steel 30;
secondly, reducing the end part chamfering angle theta 2, wherein the angle of the end part chamfering angle theta 2 is reduced by 1-2 degrees each time, and analyzing the stress value of the second flat plate steel 30 to be S6 through software;
finally, comparing the S6 with the S5,
if the S6 is 30% -60% of the S5, ending reducing the end chamfer angle theta 2, and completing the design;
if the S6 is not within the range of 30-60% of the S5, the reduction of the end chamfer angle θ 2 is continued, and the stress test analysis by software is continued until the S6 is 30-60% of the S5.
The fourth embodiment of the design method of the present invention:
a method of designing a toe end structure of a bulkhead of a marine vessel, the method comprising the steps of:
firstly, welding and fixing an arc connecting plate of a radian plate 10 in a ship high stress area, and then carrying out stress analysis on the structural strength of a first panel flat steel 20 and a second panel flat steel 30 through software to obtain the stress value S7 of the toe part of the second panel flat steel 30;
secondly, increasing the thickness of the second panel flat steel 30 by 10-15% of the thickness of the second panel flat steel 30 each time;
increasing the size of the radius R2 of the second panel flat 30, each time by 3-5% of the radius R2 of the second panel flat 30,
analyzing the stress value of the second panel flat steel 30 to be S8 through software;
finally, comparing the S8 with the S7,
if the S8 is 30% -60% of the S7, the increase of the thickness of the second panel flat 30 and the radius R2 of the second panel flat 30 are terminated, completing the design;
if the S8 is not within the range of 30% -60% of the S7, the thickness of the second panel flat 30 and the radius R2 of the second panel flat 30 are increased and the stress test analysis by the software is continued until the S8 is 30% -60% of the S7.
The fifth embodiment of the design method of the present invention:
a method of designing a toe end structure of a bulkhead of a marine vessel, the method comprising the steps of:
firstly, welding and fixing an arc connecting plate of a radian plate 10 in a ship high stress area, and then carrying out stress analysis on the structural strength of a first panel flat steel 20 and a second panel flat steel 30 through software to obtain the stress value S9 of the toe part of the second panel flat steel 30;
secondly, increasing the thickness of the second panel flat steel 30 by 10-15% of the thickness of the second panel flat steel 30 each time;
reducing the end chamfer angle theta 2, wherein each time the end chamfer angle theta 2 is reduced by 1 degree, the stress value of the second panel flat steel 30 is analyzed to be S10 through software;
finally, comparing the S10 with the S9,
if the S10 is 30% -60% of the S9, terminating the increase of the thickness of the second panel flat bar 30 and the decrease of the end chamfer angle theta 2, completing the design;
if the S10 is not within the range of 30% -60% of the S9, the second panel flat 30 continues to increase in thickness and the end chamfer angle θ 2 continues to be analyzed by the software for stress testing until the S10 is 30% -60% of the S9.
Embodiment six of the design method of the present invention:
a method of designing a toe end structure of a bulkhead of a marine vessel, the method comprising the steps of:
firstly, welding and fixing an arc connecting plate of a radian plate 10 in a ship high stress area, and then carrying out stress analysis on the structural strength of a first panel flat steel 20 and a second panel flat steel 30 through software to obtain the stress value S11 of the toe part of the second panel flat steel 30;
secondly, increasing the radius R2 of the second panel flat bar 30 by 3-5% of the radius R2 of the second panel flat bar 30 each time;
reducing the end part chamfering angle theta 2 by 1 degree every time;
analyzing the stress value of the second panel flat steel 30 to be S12 through software;
finally, comparing the S12 with the S11,
if the S12 is 30% -60% of the S11, terminating the increasing of the radius R2 and the decreasing of the end chamfer angle theta 2 of the second panel flat bar 30, completing the design;
if the S12 is not within the range of 30% -60% of the S11, the second panel flat 30 radius R2 continues to be increased and the end chamfer angle θ 2 continues to be decreased, and the stress test analysis continues through software until the S12 is 30% -60% of the S11.
Embodiment seven of the design method of the present invention:
a method of designing a toe end structure of a bulkhead of a marine vessel, the method comprising the steps of:
firstly, welding and fixing an arc connecting plate of a radian plate 10 in a ship high stress area, and then carrying out stress analysis on the structural strength of a first panel flat steel 20 and a second panel flat steel 30 through software to obtain the stress value S13 of the toe part of the second panel flat steel 30;
secondly, the thickness of the second panel flat 30 is increased by 8-10% of the thickness of the second panel flat 30 each time,
increasing the radius R2 of the second panel flat 30 by 2-3% of the radius R2 of the second panel flat 30 each time;
the end portion chamfering angle theta 2 is reduced, and every time the end portion chamfering angle theta 2 is reduced by 1 degree,
analyzing the stress value of the second panel flat steel 30 to be S14 through software;
finally, comparing the S14 with the S13,
if the S14 is 30% -60% of the S13, terminating the increasing of the radius R2 and the decreasing of the end chamfer angle theta 2 of the second panel flat bar 30, completing the design;
if the S14 is not within the range of 30% -60% of the S13, the second panel flat 30 radius R2 continues to be increased and the end chamfer angle θ 2 continues to be decreased, and the stress test analysis continues through software until the S14 is 30% -60% of the S13.
Referring to fig. 1, which is a schematic structural diagram of a radian plate 10 of the invention, the radian plate 10 comprises a first horizontal edge 12, a second vertical edge 14, a first vertical edge 13, a second horizontal edge 15 and an arc edge 11. The length of the first horizontal edge 12 is smaller than that of the second horizontal edge 15, the first horizontal edge 12 and the second horizontal edge 15 are perpendicular to the second vertical edge 14, the first horizontal edge 12 is perpendicular to the first vertical edge 13, and the circular arc edge is connected with the first vertical edge 13 and the second horizontal edge 15.
Referring to the attached drawings 2-4, a first panel flat steel 20 and a second panel flat steel 30 are fixedly welded on the arc edge 11, a plate seam 40 is reserved between the first panel flat steel 20 and the second panel flat steel 30, one end, close to the first vertical edge 13, of the first panel flat steel 20 is designed into a first beveling structure 21, and the first beveling structure 21 is in a beveling acute angle form and is convenient to connect with the radian plate 10 for good transition. The one end that second panel band steel 30 is close to second horizontal limit 15 is the second structure 31 that cuts, and the second structure 31 that cuts is the acute angle form that cuts to one side, and the transition is good with radian board 10 to the convenience.
Finite element analysis is carried out through software ABS-DLA/SFA, the structural strength of the first panel flat steel 20 and the second panel flat steel 30 is calculated and checked, and when the panel flat steel is checked, the design requirements are met by changing the three methods, namely the stress concentration condition of the toe end is reduced.
First, repeated tests were performed by increasing the thickness of the second panel flat 30 by 20% -30% each time;
second, repeated tests were performed by increasing the magnitude of R2 and changing the transition camber of the second panel flat 30;
thirdly, by changing the taper angle θ 2 of the end portion, the smaller the angle of θ 2 is theoretically the better, and by changing the angle of θ 2, the angle of θ 2 is in the range of 5 ° to 30 °, which is a trial and error.
Two or three of the above three methods can be combined to perform adjustment test to meet the design requirement.
Referring to fig. 5, the present invention is shown in a use state.
The radian plate 10 is inserted into a high stress area of a ship structure, and the thickness of the radian plate 10 is larger than or equal to the thickness of the surrounding splicing plates 16. The stress at the toe end was then subjected to finite element analysis by the software ABS-DLA/SFA.
Referring to fig. 6, for the toe end structure not manufactured by the method of the present invention, when the radius of the arc plate 10 is 700mm, θ 1 is 12 °, b is 1100mm, and a is 1000mm, finite element analysis is performed on the stress at the toe end by the software ABS-DLA/SFA, which indicates that there is high stress at the toe end, which reaches 413 MPa.
Referring to fig. 7, in the toe end structure manufactured by the method of the present invention, when the radius R1 of the first panel flat bar is 700mm, the radius R2 of the second panel flat bar is 500mm, the radius b is 1100mm, the radius a is 1000mm, the radius c is 24mm, the radius d is 15mm, the radius θ 1 is 12 °, and the radius θ 2 is 30 °, the stress at the toe end is subjected to finite element analysis by ABS-DLA/SFA software, the maximum stress at the toe end is reduced to 223MPa, and the stress value reduction value is (413 + 223)/413% = 100% = 46%.
The stress of the toe end of the node of the design scheme of the invention is obviously smaller than that of the conventional design scheme, and the stress concentration phenomenon is greatly eliminated. Under the same load, the toe end stress level of the node type is reduced by 30-60% compared with the existing scheme by carrying out finite element analysis through software ABS-DLA/SFA.
The foregoing detailed description is given by way of example only, to better enable one of ordinary skill in the art to understand the patent, and is not to be construed as limiting the scope of what is encompassed by the patent; any equivalent alterations or modifications of the apparatus according to the present disclosure are intended to fall within the scope of the present disclosure.
Claims (9)
1. A toe end structure of a ship bulkhead is characterized by comprising a cambered plate (10), a first panel flat steel (20) and a second panel flat steel (30),
the arc plate (10) comprises an arc edge (11) and an arc connecting plate integrally connected with the arc edge, and the arc connecting plate comprises a first horizontal edge (12), a first vertical edge (13), a second vertical edge (14) and a second horizontal edge (15);
the first horizontal side (12) is above the second horizontal side (15), the length of the first horizontal side (12) being less than the length of the second horizontal side (15);
the first vertical side (13) is perpendicular to the first horizontal side (12), the second vertical side (14) is respectively perpendicular to the first horizontal side (12) and the second horizontal side (15), and the length of the first vertical side (13) is smaller than that of the second vertical side (14);
the arc edge (11) is connected with the first vertical edge (13) and the second horizontal edge (15) and is sunken towards the arc connecting plate;
the first panel flat steel (20) is tightly attached to the arc edge (11) and welded and fixed, and the first panel flat steel (20) is arranged on a section of arc on which the projection of the arc edge (11) in the vertical direction leans;
one end of the first panel flat steel (20) is a sharpened first beveling structure (21), the included angle of the end part of the first beveling structure (21) is an acute angle, the edge of the first beveling structure (21) is close to the intersection position of the circular arc edge (11) and the first vertical edge (13), and the other end part of the first panel flat steel (20) is not subjected to beveling treatment;
the second panel flat steel (30) is welded and fixed on an arc at one end of the arc edge (11) which is lower in projection in the vertical direction; the included angle between the second panel flat steel (30) and the second horizontal edge (15) in the vertical direction is theta 1;
one end of the second panel flat steel (30) is close to the non-chamfered end of the first panel flat steel (20), the other end of the second panel flat steel (30) is chamfered to form a second chamfering structure (31), an included angle of the end part of the second chamfering structure (31) is an acute angle theta 2, the distance from the end part of the second chamfering structure (31) to the second horizontal side (15) in the horizontal direction is c, and the distance from the end part of the second chamfering structure (31) to the second horizontal side (15) in the vertical direction is d;
a plate seam (40) is reserved at the joint of the second panel flat steel (30) and the first panel flat steel (20) on the circular arc edge (11), and the plate seam (40) is arranged below one half of the height of the circular arc edge (11) in the vertical direction;
the thickness of the second panel flat (30) is less than the thickness of the first panel flat (20), and the width of the first panel flat (20) is the same as the width of the second panel flat (30).
2. A bulkhead toe end structure according to claim 1,
the length of the second horizontal side (15) is a, the height of the second vertical side (14) is b, and b > a, the value of a ranges from 310mm to 1030mm, and the value of b ranges from 370mm to 1340 mm;
the radius of the first panel flat steel (20) is R1, the radius of the second panel flat steel (30) is R2, R1 is smaller than R2, the numerical range of R1 is 300mm-1000mm, and the numerical range of R2 is 301mm-1500 mm;
the distance between the projection of the plate seam (40) in the horizontal direction and the end part of the second beveling structure (31) is L; the numerical range of L is 200mm-1000 mm;
the value of c is 10mm-40mm, and the value of d is 10mm-30 mm;
said θ 2 ranges in value from 5 ° to 30 °;
the value of θ 1 ranges from 5 ° to 25 °.
3. A method of designing a toe end structure of a bulkhead of a marine vessel, the method comprising the steps of:
firstly, welding and fixing an arc connecting plate of a radian plate (10) in a high-stress area of a ship, and performing stress analysis on the structural strength of a first panel flat steel (20) and a second panel flat steel (30) through software to obtain the stress value of the toe of the second panel flat steel (30) as S1;
secondly, increasing the thickness of the second panel flat steel (30), wherein the thickness of the second panel flat steel (30) is increased by 20-30% each time, and analyzing the stress value of the second panel flat steel (30) to be S2 through software;
finally, comparing the S2 with the S1,
if the S2 is 30% -60% of the S1, stopping increasing the thickness of the second panel flat steel (30) to complete the design;
if the S2 is not within the range of 30% -60% of the S1, the thickness of the second panel flat steel (30) continues to be increased, and the stress test analysis by software continues until the S2 is 30% -60% of the S1.
4. A method of designing a toe end structure of a bulkhead of a marine vessel, the method comprising the steps of:
firstly, welding and fixing an arc connecting plate of a radian plate (10) in a high-stress area of a ship, and performing stress analysis on the structural strength of a first panel flat steel (20) and a second panel flat steel (30) through software to obtain the stress value of the toe of the second panel flat steel (30) as S3;
secondly, increasing the radius R2 of the second panel flat (30), each time by 5-10% of the radius R2 of the second panel flat (30), analyzing the stress value of the second panel flat (30) to be S4 by software;
finally, comparing the S4 with the S3,
if the S4 is 30% -60% of the S3, stopping increasing the radius of the second panel flat steel (30) to complete the design;
if the S4 is not within the range of 30% -60% of the S3, the radius of the second panel flat (30) continues to be increased, and the stress test analysis by software continues until the S4 is 30% -60% of the S3.
5. A method of designing a toe end structure of a bulkhead of a marine vessel, the method comprising the steps of:
firstly, welding and fixing an arc connecting plate of a radian plate (10) in a high-stress area of a ship, and performing stress analysis on the structural strength of a first panel flat steel (20) and a second panel flat steel (30) through software to obtain the stress value of the toe of the second panel flat steel (30) as S5;
secondly, reducing the end part chamfering angle theta 2, wherein the angle of the end part chamfering angle theta 2 is reduced by 1-2 degrees each time, and analyzing the stress value of the second flat plate steel (30) to be S6 through software;
finally, comparing the S6 with the S5,
if the S6 is 30% -60% of the S5, ending reducing the end chamfer angle theta 2, and completing the design;
if the S6 is not within the range of 30-60% of the S5, the reduction of the end chamfer angle θ 2 is continued, and the stress test analysis by software is continued until the S6 is 30-60% of the S5.
6. A method of designing a toe end structure of a bulkhead of a marine vessel, the method comprising the steps of:
firstly, welding and fixing an arc connecting plate of a radian plate (10) in a high-stress area of a ship, and performing stress analysis on the structural strength of a first panel flat steel (20) and a second panel flat steel (30) through software to obtain the stress value of the toe of the second panel flat steel (30) as S7;
secondly, increasing the thickness of the second panel flat steel (30) by 10-15% each time;
increasing the radius R2 of the second panel flat (30) by 3-5% of the radius R2 of the second panel flat (30),
analyzing the stress value of the second panel flat steel (30) by software to be S8;
finally, comparing the S8 with the S7,
if the S8 is 30% -60% of the S7, terminating the increase of the thickness of the second panel flat (30) and the radius R2 of the second panel flat (30), completing the design;
if the S8 is not within the range of 30% -60% of the S7, the thickness of the second panel flat (30) and the radius R2 of the second panel flat (30) are continuously increased, and the stress test analysis by the software is continued until the S8 is 30% -60% of the S7.
7. A method of designing a toe end structure of a bulkhead of a marine vessel, the method comprising the steps of:
firstly, welding and fixing an arc connecting plate of a radian plate (10) in a high-stress area of a ship, and performing stress analysis on the structural strength of a first panel flat steel (20) and a second panel flat steel (30) through software to obtain the stress value of the toe of the second panel flat steel (30) as S9;
secondly, increasing the thickness of the second panel flat steel (30) by 10-15% each time;
reducing the end chamfer angle theta 2 by 1 degree every time the end chamfer angle theta 2 is reduced, and analyzing the stress value of the second panel flat steel (30) to be S10 through software;
finally, comparing the S10 with the S9,
if the S10 is 30% -60% of the S9, terminating the increase of the thickness of the second panel flat steel (30) and the reduction of the end chamfer angle theta 2, completing the design;
if the S10 is not within the range of 30% -60% of the S9, the second panel flat (30) thickness is continuously increased and the end chamfer angle θ 2 is reduced, and the stress test analysis by software is continuously performed until the S10 is 30% -60% of the S9.
8. A method of designing a toe end structure of a bulkhead of a marine vessel, the method comprising the steps of:
firstly, welding and fixing an arc connecting plate of a radian plate (10) in a high-stress area of a ship, and performing stress analysis on the structural strength of a first panel flat steel (20) and a second panel flat steel (30) through software to obtain the stress value of the toe of the second panel flat steel (30) as S11;
secondly, increasing the radius R2 of the second panel flat steel (30), each time by 3-5% of the radius R2 of the second panel flat steel (30);
reducing the end part chamfering angle theta 2 by 1 degree every time;
analyzing the stress value of the second panel flat steel (30) by software to be S12;
finally, comparing the S12 with the S11,
if the S12 is 30% -60% of the S11, terminating the increasing of the radius R2 of the second panel flat (30) and reducing the end chamfer angle theta 2, completing the design;
if the S12 is not within the range of 30-60% of the S11, continuing to increase the second panel flat (30) radius R2 and decrease the end chamfer angle θ 2, continuing to perform stress test analysis by software until the S12 is 30-60% of the S11.
9. A method of designing a toe end structure of a bulkhead of a marine vessel, the method comprising the steps of:
firstly, welding and fixing an arc connecting plate of a radian plate (10) in a high-stress area of a ship, and performing stress analysis on the structural strength of a first panel flat steel (20) and a second panel flat steel (30) through software to obtain the stress value of the toe of the second panel flat steel (30) as S13;
secondly, increasing the thickness of the second panel flat steel (30) by 8-10% of the thickness of the second panel flat steel (30) each time,
increasing the radius R2 of the second panel flat (30), each time by 2-3% of the radius R2 of the second panel flat (30);
the end portion chamfering angle theta 2 is reduced, and every time the end portion chamfering angle theta 2 is reduced by 1 degree,
analyzing the stress value of the second panel flat steel (30) by software to be S14;
finally, comparing the S14 with the S13,
if the S14 is 30% -60% of the S13, terminating the increasing of the radius R2 of the second panel flat (30) and reducing the end chamfer angle theta 2, completing the design;
if the S14 is not within the range of 30-60% of the S13, continuing to increase the second panel flat (30) radius R2 and decrease the end chamfer angle θ 2, continuing to perform stress test analysis by software until the S14 is 30-60% of the S13.
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| CN201910527612.9A CN110979550A (en) | 2019-06-18 | 2019-06-18 | Ship bulkhead toe end structure and design method thereof |
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| CN201910527612.9A CN110979550A (en) | 2019-06-18 | 2019-06-18 | Ship bulkhead toe end structure and design method thereof |
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| CN114275095A (en) * | 2022-01-28 | 2022-04-05 | 广船国际有限公司 | Boats and ships bracket structure |
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