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Concrete structure prestress equivalent simulation method

A concrete structure, equivalent simulation technology, applied in the field of effective simulation, can solve problems such as the inability of finite element analysis of complex structures, and achieve the effect of efficient calculation methods and accurate calculation results

Pending Publication Date: 2019-04-23
POWERCHINA CHENGDU ENG
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Problems solved by technology

[0004] In order to overcome the shortcomings of the existing "equivalent load method" that cannot perform finite element analysis on complex structures, the technical problem to be solved by the present invention is to provide a prestressed equivalent simulation that can perform finite element analysis on complex prestressed concrete structures. method

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  • Concrete structure prestress equivalent simulation method
  • Concrete structure prestress equivalent simulation method
  • Concrete structure prestress equivalent simulation method

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Embodiment

[0029] Such as figure 1 , the section form is the T-shaped section commonly used in bridge engineering, the concrete strength grade is C40, the non-prestressed ordinary steel bars adopt 4 pieces of φ12 grade II steel bars, the prestressed bars are 7 pieces of φ5 high-strength steel wires, and the tension control prestress value is 75% of the standard strength value of the prestressed tendon, the standard strength of the high-strength steel wire is 1600MPa, the prestressed tendon is arranged in an arc shape, and the radius is 16m.

[0030] figure 2 It is the grid diagram of the concrete and prestressed tendon model established according to the above dimensions.

[0031] According to the "cooling method" formula of the present invention, the cooling value to be applied to the prestressed tendons is calculated as 425°C. The external load of the test beam is applied step by step at the third point, which is 6, 10, 20, 26, 33, 40kN in sequence, and the above loads and gravity ar...

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Abstract

The invention discloses a prestress equivalent simulation method in finite element analysis of a complex prestressed concrete structure in the field of water conservancy and hydropower engineering. The prestress equivalent simulation method comprises the following steps of establishing a concrete structure unit according to structure arrangement and size; establishing pre-stressed tendon units according to the specifications and sizes of pre-stressed tendons configured in the concrete structure; applying the cooling value to the prestressed tendon unit, so that the shrinkage force generated byshrinkage of the prestressed tendon is used for simulating the pre-pressing stress of the prestressed tendon on the concrete. The beneficial effects of the invention are as follows the prestressed tendons and concrete units are established respectively; only the prestressing force of the prestressed tendons, the cross-section area, the linear dilatation coefficient and the elasticity modulus needto be clear, so that the actual effect of the prestressed tendons is considered, the prestressed effect can be effectively simulated, only the cooling value of the prestressed tendons needs to be calculated in a complex prestressed concrete structure, the calculation result is accurate, and the calculation method is efficient.

Description

technical field [0001] The invention relates to the field of water conservancy and hydropower engineering, in particular to a prestress equivalent simulation method in finite element analysis of complex prestress concrete structures. Background technique [0002] With the development of computer technology and calculation methods, the finite element method has become the most effective calculation method in the fields of computational mechanics and computational engineering science. At present, the research on prestressed concrete structures is generally based on finite element numerical analysis. When using the finite element numerical calculation method to analyze the prestressed concrete structure, the widely recognized prestress equivalent simulation method is the "equivalent load method". [0003] "Equivalent load method" is a traditional analysis method for prestressed concrete structures. Its idea is to only establish concrete elements, and use the principle of load ...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23G06F2119/06
Inventor 张志川
Owner POWERCHINA CHENGDU ENG
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