Informatics Publishing Limited

He Wei ¹, Li Mengying ¹, Shuyi Guo ²

Affiliations
1 School of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou 450 045, Henan, CN
2 School of Mechanical Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450 045, Henan, CN

Abstract

With the development of metallurgical technology, a lot of large spanmetal beam structures appear in mining, machinery and construction. Structural damage identification is extremely important in engineering. The technology of structural damage identification based on dynamic characteristics has been one of the hot issues in current engineering research. Based on the absolute curvature difference modal analysis method and perturbation theory, the finite element model of a simply supported beam structure was established by ANSYS software, so as to study the damage localization and damage quantification. Under the condition of single damage and multiple damage of simple beam structure, reducing the elastic modulus of each element in the model by means of numerical simulation, and analyzing the change of curvature mode to enable study the damage localization. Then, based on the perturbation theory, the curvature difference mode method is used to analyze the damage quantitatively. The results are of great reference value for damage detection of large spanbeam structures.

Keywords

Metallurgical, Damage Identification, Metal Beam Structure, Absolute Curvature Difference, Perturbation.

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He Wei ¹, Lin Xinhao ², Zhang Qianqian ¹, Guo Shuyi ³

Affiliations
1 School of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou, 450 045, CN
2 Xinlian College, Henan Normal University, Zhengzhou 452 750, Henan, CN
3 School of Mechanical Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450 045, Henan, CN

Abstract

The mechanical properties of concrete bridge located in mining area are influenced by the mining area environment and thickness of pavement. The unreasonable design of pavement layer will easily lead to the concrete bridge deck cracking. Based on FEM (finite element method), Jiaozuo Bridge is taken as an example to study on mechanical influence of pavement on concrete bridge deck with different thicknesses. A three-dimensional finite element model is built to simulate the bridges with three kinds of thickness of concrete deck pavement respectively. The results show that the maximum longitudinal and lateral tensile stresses in girder increase with the thickness of deck pavement which will cause the girder cracking while the maximum lateral tensile stress in concrete deck pavement decreases. When the thickness of waterproofing layer of deck pavement is 11cm, the stresses in deck pavement are all the least ones among the three cases respectively. The possibility of being crack in deck pavement is the lowest. And the design scheme which the thickness of waterproof concrete pavement is 11cm will be the best.

Keywords

Concrete Bridge, Mining Area, Pavement Thickness, Finite Element Method.

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He Wei ¹, Zhu Ge ¹, Guo Shuyi ²

Affiliations
1 School of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou 450 045, Henan, CN
2 School of Mechanical Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450 045, Henan, CN

Abstract

Highway traffic is the lifeline of the national economy, and the bridge is the throat of the road, so the well used status of bridge is an important determinant factor of highway traffic safety. With the development of metallurgical and welding technology, high performance steels have been widely used in large span concrete bridge structures. Based on the theory of finite element method and ANSYS software, Lianhuo highway prestressed concrete continuous beam bridge is taken as the research object, and a three-dimensional finite element model of the bridge is established to analyse the stress characteristics, load effect, internal force of the structure in the ultimate limit state of bearing capacity and serviceability under different conditions. The results can provide a reliable basis for the design of the bridge.

Keywords

High Performance, T-beam Bridge, Ultimate Limit State, Serviceability Limit State, Modal Analysis.

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