A Numerical Iterative Method for Internal Force Identification of Bridge Short Hangers
A numerical iteration and short boom technology, applied in special data processing applications, geometric CAD, etc., can solve problems such as the inability to reasonably identify the stress state of bridge structures, and achieve safe operation, easy programming, and convenient and reliable operation Effect
Active Publication Date: 2022-08-05
WUHAN UNIV OF TECH
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Problems solved by technology
If the boundary constraints of the suspender are still regarded as hinged supports at both ends, the identified internal force of the suspender will be quite different from the actual situation, and it is naturally impossible to reasonably identify the stress state of the bridge structure
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Embodiment 1
[0095] The invention takes an arch bridge structure in Xiaogan City, Hubei Province as the engineering background, verifies the reliability of the proposed iterative method for identifying the internal force of the short suspender, identifies the internal force of the suspender according to the boundary constraints of the hinged support at both ends and the fixed support at both ends, and analyzes the internal force of the suspender. The identification results are compared with the actual tension force. The main span of the arch bridge is 69.00m, and 11 pairs of suspension rods are set up, and they are arranged symmetrically about the center of the bridge. The boom is made of galvanized high-strength parallel steel wire, the upper end of the cold-cast anchor head is anchored on the steel box arch, and the lower end of the tensile cold-cast anchor head is anchored to the beam end anchor block. During tensioning, the symmetrical suspension rods on both sides of the arch bridge a...
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The present invention provides a numerical iterative method for identifying the internal force of a short bridge hanger, including the following steps: Step 1. Propose a formula for identifying the internal force of a short bridge hanger: in the existing known homogeneous hanger for lateral vibration, the undamped free vibration On the basis of the formation function, the fixed support at both ends of the boom is used as the boundary condition, and the identification formula of the internal force of the short boom is obtained by substitution and simplification; Step 2, use MATLAB to compile an iterative operation program to assist the calculation of the formula. In the actual engineering structure, the acceleration response signal of the lateral vibration of the bridge suspender is picked up by the signal acquisition and analysis instrument, and its natural frequency is identified, and then the numerical iteration method for identifying the internal force of the short suspender of the bridge of the present invention is used to identify the internal force of the short suspender, The feasibility and reliability of the method are verified by comparison with the measured boom tension. The comparison results show that the method can more accurately identify the internal force of the short suspension rod, which is beneficial to ensure the safety performance of the bridge structure.
Description
technical field [0001] The invention belongs to the fields of cable-stayed construction and bridge structure detection of suspension bridges, cable-stayed bridges and arch bridges, and particularly relates to a method for identifying the internal force of a short suspension rod of a bridge. Background technique [0002] Suspension rods are important stress-bearing components of bridge structures such as suspension bridges, cable-stayed bridges, and mid-bearing or bottom-bearing arch bridges. The accurate identification of their internal forces is directly related to the safe operation of the bridge structure and even the reasonable assessment of the health status of the bridge structure. . At present, the most common method to identify the internal force of the bridge boom is the frequency method, which uses the relationship between the natural frequency of the lateral vibration of the boom and the internal force to indirectly identify the internal force of the boom. The te...
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IPC IPC(8): G06F30/13
CPCG06F30/13
Inventor 张开银吴帅姚璐
Owner WUHAN UNIV OF TECH