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A Method for Determining the Load-end Contraction Curve of Longitudinal Multi-span Instability

A method for determining the longitudinal bone, applied in the direction of instrumentation, geometric CAD, design optimization/simulation, etc., can solve the problems of high requirements, large modeling and calculation time, etc., to achieve ship design safety, expand calculation accuracy, improve accuracy and speed effect

Active Publication Date: 2021-09-07
708TH RES INST OF CSSC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the requirements for computer hardware and software operators are relatively high, and it takes a lot of modeling and calculation time

Method used

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  • A Method for Determining the Load-end Contraction Curve of Longitudinal Multi-span Instability
  • A Method for Determining the Load-end Contraction Curve of Longitudinal Multi-span Instability
  • A Method for Determining the Load-end Contraction Curve of Longitudinal Multi-span Instability

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Embodiment Construction

[0055] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0056] In a preferred embodiment, as figure 1 As shown, a method for determining the load-contraction curve of longitudinal multi-span instability considering the lateral load.

[0057] Methods of determination may include:

[0058] Step S1, establishing a calculation model for the lateral displacement of the plate frame under the action of the lateral load;

[0059] Step S2, using the beam as the elastic support of the longitudinal frame, according to the simple frame theory of "Ship Structural Mechanics", calculate the deformation of the frame under the action of lateral load, so as to determine the lateral displacement of the longitudinal frame support;

[0060] Step S2, deriving the formula for the additional bending moment of the longitudinal bone caused by the lateral movement of the beam;

[0061] Step S3, introduce the overall deformation of ...

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Abstract

The present invention relates to the field of ship structure design, and proposes a method for determining the load-end shrinkage curve of multi-span longitudinals in consideration of lateral loads, including: establishing a beam or floor plate ( Theoretical model of the multi-span instability of the longitudinal bone under the influence of the lateral movement of the beam) and the longitudinal axial force and lateral pressure at the same time; by solving the differential equation, the additional eccentricity of the longitudinal bone caused by the lateral movement of the beam is obtained; Calculation formula of ultimate load for multi-span instability of longitudinal bone considering lateral load; through edge function and plasticity correction, the ultimate load of multi-span instability of longitudinal bone is obtained as load of multi-span instability of longitudinal bone considering lateral load ‑End contraction curve formula; the above-mentioned technical scheme can be used to expand the existing Smith method for hull girder ultimate load calculation, determine the "double bottom effect" of hull girder ultimate load, and improve the accuracy and speed of hull girder ultimate bending moment calculation.

Description

technical field [0001] The invention relates to the field of ship structure design, in particular to a method for determining a load-contraction curve for multi-span instability of longitudinals in consideration of lateral loads. Background technique [0002] The hull girder ultimate load is the maximum ability of the hull structure to resist overall collapse, and it is the extreme value of the vertical bending moment-curvature curve of the hull cross section, such as figure 1 shown. The determination and evaluation of hull girder ultimate load is of great significance to ensure ship safety and design rationality, and it is a recent research hotspot in international ship structural mechanics. Since 2006, the International Association of Classification Societies (IACS) has clearly stipulated in the Common Structural Rules (CSR) for bulk carriers and oil tankers that ship design must carry out hull girder limit load evaluation. The CSR code stipulates that the calculation of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F30/15G06F119/14
CPCG06F30/15G06F30/20
Inventor 万琪王福花吴剑国彭营豪朱汉波
Owner 708TH RES INST OF CSSC
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