Finite element simulation analysis method for arch crown of ribbed spherical shell under multi-point load
A simulation analysis and finite element technology, applied in design optimization/simulation, instrumentation, calculation, etc., can solve problems such as the inability to check concentrated loads and the lack of safety guarantees
Pending Publication Date: 2019-08-06
CHINA PETROLEUM ENG & CONSTR +3
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Problems solved by technology
It is impossible to check for concentrated loads, especially in the current need for stress, linear and nonlinear stability under concentrated loads, lack of safety guarantees
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[0040] The principles and features of the present invention will be described below in conjunction with the accompanying drawings and specific embodiments. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention.
[0041] Such as Figure 1 to Figure 7 As shown, the present invention provides a finite element simulation analysis method for a ribbed spherical shell vault under multi-point load, comprising the following steps:
[0042] S1: Establish and analyze the finite element geometric model;
[0043] S2: Input concentrated loads to the simulated vault 1 successively on the basis of the analyzed finite element geometric model to obtain the linear instability mode of the vault 1;
[0044] S3: Obtain the initial load value of the nonlinear stability analysis of the vault 1 according to the linear instability mode, including the following steps:
[0045] S31: Calculate the displacement vector value of e...
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The invention relates to a finite element simulation analysis method for an arch crown of a ribbed spherical shell under a multi-point load. The method comprises the following steps: establishing andanalyzing a finite element geometric model; inputting a concentrated load to the simulated vault in sequence to obtain a linear instability mode of the concentrated load; obtaining a vault nonlinear stability analysis initial load value; inputting a concentrated load on the vault to obtain a first linear stability coefficient, and comparing the first linear stability coefficient with an evaluationvalue; when the linear stability coefficient is less than the evaluation value, adding the local reinforcing member until the the linear stability coefficient is greater than or equal to the evaluation value, judging that the arc crow is qualified; according to the qualified model, amplifying the concentrated load on the original input arch crown by a set multiplying power in equal proportion, and performing analyzing to obtain an unstable load value of the arch crown; and calculating a stability coefficient. According to the method, the actual modality and deformation distribution of the arch crown of the ribbed spherical shell under different load conditions are simulated, the stability of the spherical shell arch crown with the ribs under different load conditions is analyzed, and theinstability resisting method of therch crown of the ribbed spherical shell under different load conditions is obtained.
Description
technical field [0001] The invention relates to the technical field of structural dynamics problems, in particular to a finite element simulation analysis method for a ribbed spherical shell vault under multi-point loads. Background technique [0002] The ribbed spherical shell vault is a unique domestic storage tank structure. Compared with the truss-type or column-supported tank roof, it has a simpler structure and better economy. However, its bearing capacity is limited. The current standard only considers the spherical shell to bear the uniform load in the calculation and cannot check the influence of the additional multi-point load on it. In actual engineering, the vault not only bears a certain amount of external pressure, but also bears a large concentrated force in some cases, or even a multi-point distributed load. For example: due to the need to maintain a high gas phase seal in the internal pressure storage tank, it is necessary to set up a high-precision start-u...
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IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 邓海军董磊袁玲占双林崔振宁郭树平李魏崔健苏灵君吴家祥吴继尧
Owner CHINA PETROLEUM ENG & CONSTR