Simultaneous monitoring method for welded steel truss structure fatigue failure process

A truss structure, fatigue failure technology, applied in the direction of machine/structural component testing, measuring devices, instruments, etc., can solve problems such as hindering the development and application of the system, poor identification ability, etc., to achieve the effect of improving test accuracy and efficiency

Active Publication Date: 2013-06-05
SOUTHEAST UNIV
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Problems solved by technology

For some large civil engineering structures, the number of sensors that make up the health monitoring system is limited, and the existing sensors are usually poor in identifying low-level damage; at the same time, in the long-term monitoring process, various sensors The obtained test data is

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  • Simultaneous monitoring method for welded steel truss structure fatigue failure process

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Embodiment Construction

[0029] Embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: the welded steel truss model in this embodiment is a scaled-down model of a large bridge steel box girder longitudinal stiffening truss, which is assembled by welding bridge steel plates, and its structural configuration, The welding method and processing technology are consistent with the original structure.

[0030] This embodiment includes the following specific steps:

[0031] The general finite element program ANSYS is used to establish the finite element model of the welded steel truss, and the local mesh geometry refinement is carried out according to the analysis target, such as figure 1 As shown, the model is simulated using the four-node elastic-plastic shell unit shell181, including a total of 45624 units, the material elastic modulus is 206GPa, the density is 7850kg / m3, and the Poisson’s ratio is 0.2588; the model completely reflects the geometri...

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Abstract

The invention discloses a simultaneous monitoring method for welded steel truss structure fatigue failure process. The method comprises the following steps: step 1, damageable parts under structural material levels are confirmed through building a finite element model of a welded steel structure and conducting static analysis; step 2, feature response parameters of the damageable parts under each structural material level are confirmed and a corresponding testing scheme is set; step 3, a sensor location project and positions under each structural material level are confirmed, and measures of installing, debugging, noise reduction arrangement and disturbance releasing are finished; and step 4, fatigue loading is exerted to a structure, and welded steel truss materials, components, the failure process under the structural levels, the feature response and the evolution process with a fatigue cycle are monitored simultaneously through a plurality of testing technical means. Compared with a traditional and common structure failure assessment method, the simultaneous monitoring method is capable of reflecting the whole failure process of the structure and the feature response of each level comprehensively, and is beneficial for understanding and researching the failure process and failure mechanism of the structure.

Description

technical field [0001] The invention belongs to the field of failure analysis of engineering structures, and is a multi-scale synchronous testing method aimed at the failure process and failure mechanism analysis of welded steel structures. Description, prediction and control of structural failure processes. Background technique [0002] The design function of the engineering structure will not change after the structure is built and used as a whole. However, during the service period of decades or even hundreds of years, the engineering structure will face complex and even possibly changing environmental and operating conditions. The long-term and comprehensive action of factors such as aging, external environmental erosion, fatigue effects of loads, and sudden accident overload effects will lead to damage accumulation, evolution, and resistance attenuation in the structural system, thereby reducing the service function of the structure. Under extreme conditions, it will C...

Claims

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Application Information

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IPC IPC(8): G01M99/00
Inventor 何顶顶黄跃平李兆霞
Owner SOUTHEAST UNIV
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