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Virtual straining method for load relaxing system computing

A systematic and mitigating technology, applied in the field of virtual strain calculation, which can solve problems such as the inability to directly obtain internal force conditions

Inactive Publication Date: 2007-01-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a clear concept and is helpful to understand the working nature of the load relaxation system, but it cannot directly obtain the internal force of each unit in it

Method used

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  • Virtual straining method for load relaxing system computing
  • Virtual straining method for load relaxing system computing
  • Virtual straining method for load relaxing system computing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1: attached figure 1 It is a model of a load relaxation system with two cables. The initial cable length is 4m. The pulleys at nodes 1 and 2 are respectively connected with a weight of 25kN to obtain a constant tension of 25kN. The cross-sectional area of ​​the cable is A=1cm 2 . Apply a load P=30kN at the middle node 3, and load it step by step, and the load increment is taken as 1kN.

[0039] Using the virtual strain method and taking different initial strain values, five sets of calculations were carried out, and the calculation results are shown in Table 1.

[0040] The displacement analysis value Y of the 3 nodes can be calculated by formula (2):

[0041] 4 Y = 25 2 - ( P 2 ) 2 ...

Embodiment 2

[0045] Embodiment 2: to attach Figure 2a And attached Figure 2b The load mitigation system of the cable-net structure is shown. In this paper, the virtual strain method is used to solve the problem, and the results are compared with the calculated results of the dynamic relaxation method and the experimental results. The structure is a saddle-shaped hyperbolic parabolic cable net with a square plane, a diagonal span of 2m, and a sagittal height of 0.3m, as shown in Figure 2. All boundary nodes are pulleys and hang a weight of 20N; the diameter of the cable is Φ=1.2mm. A vertical load P is applied at the middle node O, and P is loaded in stages from 40N to 200N.

[0046] The virtual strain method proposed in this patent is adopted, and three groups of different initial strain values ​​are selected for calculation.

[0047] attached image 3 The displacement calculated by virtual strain method for node O is compared with the experimental results and the results of dynamic...

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Abstract

The invention relates to a dummy strain method of the load relaxation system computing. The invention changes strain value of the unit to the original strain value <- 0 after computing the every load step; also it records the shape of the structure transformation as the original module of the next load step computing. The invention can keep the unit internal force which is the original internal force value by setting the funicular unit original strain value and controlling the strain of the unit in the every load step, so it simulates the running process of the load relaxation system well, it also achieve analysis to the load relaxation system made by the funiculars.

Description

technical field [0001] The invention belongs to a virtual strain calculation method, in particular to a virtual strain method for calculation of a load relaxation system, and belongs to the field of calculation theory research of a super large deformation load relaxation structure system. Background technique [0002] With the rapid development of my country's national economy, the construction of large-scale stadiums and exhibition centers provides a good opportunity for the application of long-span spatial structures, especially the cable-strut tension structure system has become a hot spot in current research and engineering attempts. Tension structures composed of rods have been continuously proposed, such as: cable net structure, cable truss structure, cable dome structure and cable membrane structure. On the other hand, the external effects of the structure (external loads, earthquakes, etc.) are contingency and randomness, and the live loads usually considered include ...

Claims

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Application Information

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IPC IPC(8): G06F17/00
Inventor 高博青杜文风吴会鹏彭伟贤
Owner ZHEJIANG UNIV
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