Method for analyzing ultimate strength of ultra-large floating body structure under action of complex loads
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A complex load and ultimate strength technology, applied in the direction of instruments, design optimization/simulation, electrical digital data processing, etc., can solve problems such as insecurity and inaccurate ultimate strength evaluation, and achieve convenient operation, good industrial application prospects, and wide application range wide effect
Pending Publication Date: 2020-01-31
CHINA SHIP SCIENTIFIC RESEARCH CENTER (THE 702 INSTITUTE OF CHINA SHIPBUILDING INDUSTRY CORPORATION)
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Therefore, it is inaccurate and unsafe to only evaluate the ultimate bearing capacity under bending load, compared to the ultimate strength evaluation of super-large floating body structures
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Embodiment 1
[0095] Embodiment 1: The ultimate strength analysis of the horizontal brace in the super-large floating body is taken as an example for illustration.
[0096] Such as figure 2 and image 3 As shown, the cross brace 2 includes a cylindrical part 21 in the middle, and the two ends of the cylindrical part 21 are respectively extended with supporting parts 22, and the two supporting parts 22 are fixedly connected with the super large floating body 1 respectively; Figure 4 As shown, a plurality of reinforcing ribs are arranged inside the cylindrical portion 21 .
[0097] Establish the finite element model of the cross brace 2, and divide the grid units, such as Figure 4 shown;
[0098] Brace 2 is a super-large floating body structure composed of a single component. Therefore, based on modal analysis, the first-order mode of brace 2 is obtained. Through static analysis, the node displacement of each unit is obtained, and the node displacement with the largest magnitude is comp...
Embodiment 2
[0106] Embodiment 2: The ultimate strength analysis of the main structure in the super-large floating body is taken as an example for illustration.
[0107] Such as Figure 12 As shown, the main structure is a rectangular frame structure as a whole, including a deck frame 31 at the top, a floor frame 33 at the bottom, and a side frame 32 connecting the deck frame 31 and the bottom frame 33 on both sides. Vertical longitudinal bulkhead 34 and multiple transverse bulkheads 35, such as Figure 13 As shown, a plurality of reinforcing ribs 36 are arranged inside the main structure; wherein the floor frame 33 is fixedly connected to the super-large floating body 1, and the two ends of the main structure are connected with connectors.
[0108] Establish the finite element model of the main structure and divide the grid units, such as Figure 14 shown;
[0109]The main structure is composed of multiple components, so the polynomial fitting analysis is used to obtain its first-order...
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Abstract
The invention relates to a method for analyzing the ultimate strength of an ultra-large floating body structure under the action of a complex load. The method comprises the following steps: establishing a finite element model, dividing grid units, solving the displacement of each unit node in a first-order mode, comparing the node displacement with the maximum amplitude with the initial deformation of an ultra-large floating body structure to obtain a coefficient, and multiplying the coefficient by the displacement of each unit node to obtain a new node displacement as the input of strength analysis; wherein the input further comprises prestress, boundary conditions and displacement generated by complex loads; based on a nonlinear transient dynamic analysis method, obtaining a failure mode, a load, a stress distribution condition and a structure energy dissipation condition of an ultra-large floating body structure, adjusting displacement generated by a complex load to obtain a plurality of loads, and then obtaining a limit load value. The method is convenient, analysis is convenient, the application range is wide, the method can be widely applied to ocean engineering structural strength checking under the action of complex loads, and reliable technical support is provided for preliminary and detailed design, structural optimization and the like.
Description
technical field [0001] The invention relates to the technical field of safety and reliability of marine engineering structures, in particular to an analysis method for the ultimate strength of a super-large floating body structure under the action of complex loads. Background technique [0002] The ultra-large floating body structure has been used for a long time in a complex and changeable marine environment, and is subjected to multiple loads such as wind, waves, and currents. The modules of the floating body are connected end to end through connectors. The wave load is the most important, most complicated and longest-lasting external load; under the long-term action of the wind wave and current environment and the storm weather conditions, the super-large floating body structure will produce many structural failure modes. Moreover, in extreme sea conditions, the super-large floating body structure bears large loads in all directions, and the magnitudes are equivalent. ...
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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06F119/14
Inventor 赵南顾学康王艺陶刘俊杰李政杰张凡祁恩荣杨骏
Owner CHINA SHIP SCIENTIFIC RESEARCH CENTER (THE 702 INSTITUTE OF CHINA SHIPBUILDING INDUSTRY CORPORATION)
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