Simultaneous monitoring method for welded steel truss structure fatigue failure process

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...

AI Technical Summary

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 also a massive amount of information. Therefore, how to rely on the existing technical means to extract the information that truly and effectively reflects the structural operation and damage state from the massive data is a problem that hinders the development and application of the system.

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