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A bolt connection point stress optimization analysis method

An analysis method and connection point technology, applied in the field of electric power, can solve problems such as insufficient research on bolted connection points of transmission towers, and achieve the effect of improving design and construction level, ensuring safe operation, and optimizing stress

Pending Publication Date: 2019-05-03
国网内蒙古东部电力有限公司经济技术研究院 +2
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Problems solved by technology

At present, a lot of research has been done on the mechanical properties of steel under low temperature conditions. However, the research on the failure mechanism and process of bolted joints of transmission towers under low temperature conditions is still insufficient.

Method used

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  • A bolt connection point stress optimization analysis method
  • A bolt connection point stress optimization analysis method
  • A bolt connection point stress optimization analysis method

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Embodiment Construction

[0028] The invention is a stress optimization analysis method for a bolt connection point, comprising the following steps:

[0029] Step 1: Optimum analysis of joint stress when considering bolt preload;

[0030] In the stress optimization analysis of bolted joints, it is considered that the pre-tightening force of the bolts may affect the tensile process of the joints, so taking the Q345B-M16 single-row bolt joints as an example, the joints are respectively applied with 0 %, 50%, 150% and 200% loads for nodal tensile tests, such as figure 1 as shown, figure 1 is the load-displacement curve of the joint under different preloads. From figure 1It can be seen from the figure that the failure form of the joints is bolt shearing; the load-displacement curves of the joints basically coincide, and the load-displacement curves of 0% and 40% of the pre-tightening force design value of the load-displacement curve 1-1 joints and The sliding process of the 1-2 node is relatively close...

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Abstract

The invention belongs to the technical field of electric power, and particularly relates to a bolt connection point stress optimization analysis method. The method comprises node stress optimization analysis in consideration of bolt pre-tightening force and node stress optimization analysis in consideration of ultimate bearing capacity. According to the method, the mechanical properties of 500kV power transmission line iron tower steel and weld joints under the low-temperature condition are studied, the change rule of the mechanical properties of bolt connection nodes with the temperature under the low-temperature condition is analyzed, and the influence rule of the machining process on the mechanical properties of the power transmission tower materials is analyzed; establishing a fine finite element model of the tower material component containing the bolt, researching the stress distribution condition on the tower material component, analyzing factors influencing the stress concentration, researching a method for improving the stress distribution of the component, and optimizing the stress at the joint of the tower material and the bolt. The design and construction level of powertransmission line engineering can be greatly improved, and safe operation of power transmission lines in high and cold areas is ensured.

Description

technical field [0001] The invention belongs to the technical field of electric power, and in particular relates to a force optimization analysis method for a bolt connection point. Background technique [0002] For important ultra-high voltage transmission lines in severe cold regions in my country, the lines enter permafrost and frost-affected areas on a large scale, and the minimum temperature of individual tenders reaches -45°C. This not only makes the engineering construction face greater challenges, but also directly affects the transmission line safe operation. [0003] Under low temperature conditions, transmission line iron tower materials are prone to low-temperature brittle failure, which is different from the strength failure of general iron towers. The brittle failure of iron towers at low temperatures is very dangerous. During low-temperature brittle failure, the steel has no obvious plastic deformation process and has great potential. Great suddenness, great d...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 曹阳杜文越丛日立赵明宇党伟
Owner 国网内蒙古东部电力有限公司经济技术研究院
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