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Construction method of static and dynamic action stiffness model of inclined suspension cable

A technology of stiffness model and construction method, which is applied in special data processing applications, instruments, design optimization/simulation, etc., and can solve problems such as inaccuracy, ignoring components, and lack of stiffness

Active Publication Date: 2019-03-19
HARBIN INST OF TECH
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Problems solved by technology

In the field of power grid transmission engineering, Japanese scholars simplified the wire as a massless spring, and the spring stiffness was taken as EA / L, which was too conservative and inaccurate; VELETSOS et al. obtained a closed expression of the in-plane horizontal stiffness through dynamic analysis of inclined suspension cables , but this expression is the concept of frequency response function in random vibration theory, which includes the phase difference of velocity and acceleration, and does not have the physical meaning of stiffness, and the component of the cable's own weight along the chord direction is ignored in the derivation process, making the inclination angle relatively small Large time errors cannot be ignored

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  • Construction method of static and dynamic action stiffness model of inclined suspension cable
  • Construction method of static and dynamic action stiffness model of inclined suspension cable
  • Construction method of static and dynamic action stiffness model of inclined suspension cable

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specific Embodiment approach

[0335] The present invention proposes a method for constructing the static and dynamic stiffness models of inclined suspension cables. The procedure for using the method is as follows: Figure 5 shown. The specific implementation is as follows:

[0336] Description of the problem: 8 split high-voltage transmission wires are hung on both sides of the crossarm on the top of a drum-shaped transmission tower. The model of the transmission wire is LGJ500 / 35. The transmission tower considering the action of the transmission wire is analyzed for rare earthquakes of 8 degrees.

[0337] Apply the present invention to set up the stiffness model steps of transmission wire (inclined suspension cable) as follows:

[0338] Step 1: Establish the static stiffness K of the inclined suspension cable st

[0339] According to formula Calculate the cable length parameter L e , according to the formula Calculate the cable structure parameter λ 2 , the L e and lambda 2 Substitution Get...

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Abstract

The invention provides a method for constructing a static and dynamic action stiffness model of an inclined suspension cable. The method comprises the following steps: step 1, describing a problem andestablishing a cable shape function; step 2, establishing a cable element motion equation; step 3, solving the motion equation to obtain a frequency response function; step 4, establishing static stiffness Kst; step 5, establishing a cable power coefficient; and 6, establishing a static and dynamic action stiffness model of the inclined suspension cable. According to the method, the dynamic characteristics, including damping and the minimum necessary vibration mode number, of the cable structure are fully considered, a multi-order vibration mode participated inclined suspension cable rigiditymechanical model is formed, modeling is convenient in numerical calculation, calculation efficiency is high, and the method is suitable for rapid assessment of structural post-disaster damage.

Description

technical field [0001] The invention belongs to the technical field of power grid transmission engineering and cable-stayed bridges, in particular to a method for constructing static and dynamic stiffness models of inclined suspension cables. Background technique [0002] At present, some scholars have carried out research on the overall structure of cable-stayed bridges or transmission tower systems. Among them, in the research field of cable-stayed bridges, the cables are simulated by truss elements, and the elastic modulus of the material is corrected by Ernst formula to consider the sag effect of the cables. The derivation process of Ernst formula ignores the component of cable self-weight along the chord direction, and belongs to the result of static analysis, without considering the dynamic effect of cable. In the field of power grid transmission engineering, Japanese scholars simplified the wire as a massless spring, and the spring stiffness was taken as EA / L, which ...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23G06F2119/06Y02T90/00
Inventor 支旭东龚俊商文念范峰周川江
Owner HARBIN INST OF TECH
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