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Internal force detecting method for hanger rod with shock absorber

A measurement method and shock absorber technology, applied in the direction of instruments, measuring force, measuring devices, etc., can solve problems such as no cable-rod structure, only measurement, wrong cable force, etc.

Active Publication Date: 2012-12-19
GUANGXI TRANSPORTATION SCI & TECH GRP CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are two disadvantages: one is that the cost is too high, and the other is that it can only measure the tension at the anchor head. When the cable is stuck at a certain position during the tensioning process, this method will measure the wrong cable force.
At present, the frequency testing technology of structures is very mature and can fully meet the needs of engineering, but there is no calculation method for the relationship between frequency and cable force that can be widely applied to cable-strut structures under various complex boundary conditions

Method used

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  • Internal force detecting method for hanger rod with shock absorber
  • Internal force detecting method for hanger rod with shock absorber
  • Internal force detecting method for hanger rod with shock absorber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The calculation diagram of the suspender of an arch bridge is as follows figure 1 , the length of the cable is l=28.82m, the mass per unit length of the cable is ρ=8270kg / m, and the modulus of elasticity is E=2.05×10 11 , cross-sectional area A=0.003271m 2 , the moment of inertia is I=4.76×10 -7 , the distance between the two shock absorbers and the end is 3.37m, and the transverse stiffness of the shock absorber is 4.98×10 6 , the measured first-order frequency value is 5.566HZ, find the cable force of the cable.

[0050] The solution process of the suspender cable force is as follows:

[0051] (a) Determine the range of the cable force:

[0052] T 1 = 4 m l 2 π 2 f 0 B n ...

Embodiment 2

[0062] A bridge is a prestressed concrete continuous rigid frame-arch composite bridge. The bridge is equipped with 39 suspenders. The calculated length of the suspenders is about 5-30m. It is a relatively short suspender, and its bending stiffness affects the frequency of the suspenders. In addition, a sealed sheath is installed outside the boom, and the sheath also affects the test frequency of the boom. Therefore, there are the above two difficulties when measuring the internal force of the boom. In order to solve these two influencing factors, the identification of the bending stiffness and the conversion quality of the sheath are especially carried out for the short suspender, so that the internal force of the suspender can be identified more accurately.

[0063] The rod is in the form of a single boom, the upper end of the boom is anchored on the steel box beam welded between the webs of the double dumbbells, and the lower end of the boom is anchored at the longitudinal ...

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Abstract

The invention discloses an internal force detecting method for a hanger rod with a shock absorber, sequentially comprising the following steps of: 1, collecting basic parameters of a hanger rod structure; 2, computing the geometric stiffness EI of the cross section of the hanger rod; 3, testing the vibration frequency of the hanger rod structure; 4, building finite element computational simulation under the analysis of the vibration frequency of the hanger rod structure; and 5, solving a vibration frequency equation, so that the internal force of the hanger rod can be obtained. The method can completely consider the vibration parameters of the cable rods including the stiffness, the nonhomogeneity, the complex boundary conditions and the like of the cable rods, and can identify the internal force of the cable rod, which can not be identified by the conventional method under the complex conditions.

Description

technical field [0001] The invention belongs to the technique of measuring the internal force of a suspender, and in particular relates to a method for measuring the internal force of a short suspender with a shock absorber. The technique can be used for adjusting the internal force of a tie bar and a suspender in bridge construction and reinforcement. Background technique [0002] Cables and rods are common components in engineering structures and are widely used in bridge engineering, such as cable-stayed cables of cable-stayed bridges, hangers and tie rods of arch bridges, suspension cables and hangers of suspension bridges, and rigid supports in steel truss bridges pole etc. The boundary conditions of cable and rod structures in operation are often complex, and the previous structural analysis only dealt with them simply, which will inevitably bring large errors to the calculation results. However, if the safety and reliability of various long-span bridges are to be acc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/00
Inventor 张云王荣辉邱波周晓蓉马玥
Owner GUANGXI TRANSPORTATION SCI & TECH GRP CO LTD
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