The Eccentric Compression Experiment On Equal Angle Steel And Finite Element Analysis

With easy connection and other characteristics, equal angle steel is widely used in the construction of power transmission tower, including a large number of single-side pressure connection structure, the structure of complex eccentric compression on both ends is commonly. In order to make the design of power transmission tower more economically and more reasonably, objective to study the application of structure of equal angle steel with eccentric compression in design of transmission tower structures, a total of twelve equal angle steel components in four different standard were designed to research on the static loading tests. The research of mechanics performance characteristics of angle steel, such as failure mode, deformation ability, ultimate bearing capacity and stress distribution, in different model of section and different slenderness ratio, provided basic experiment materials for deep theoretical research and engineering design.The test showed that: the specimen mainly control by to overall buckling instability, and generates bending deflection which revolve around connecting leg in the process of static loading tests. Before it reach to ultimate bearing capacity, the torsion of section and the rotation of the top spherical hinge are limited, the torsion of specimen and spherical hinge can be ignored in analysis.The comparison of the reckoning of Chinese and American codes of steel structures design suggests that the experimental results is more close to American code, and has larger difference with Chinese code, the mean range of bearing capacity is about thirty percent. And the comparison of the coefficient of overall stability of structure suggests that only the influence of minimum turning °ius of angle steel was considered in the design formula of Chinese code. And conflict with the result of experiment.The article 3D modeling specimens by the finite element analysis software ANSYS, considered the influence of material nonlinearity and geometrical nonlinearity in simulation analysis. Analyzed the failure mode, stress and strain, deformation performance and ultimate bearing capacity of specimens, and the influence of slenderness ratio, width-thickness ratio, thickness of gusset plate and lap length of angel steel on mechanical performance of specimens.Simulation analysis suggests that the results of software of finite element analysis fit nicely with experimental result, and the difference value of ultimate bearing capacity is within ten percent of the reasonable range. It shows that the use of finite element analysis for intensive study of specimens is feasible. The analysis of parameters of specimens, such as slenderness ratio, width-thickness ratio, thickness of gusset plate and lap length, suggests that the mechanical performance of specimens can be affected by the parameters. Besides, when other conditions unchanged, the less slenderness ratio of specimens the less influence of mechanical performance caused by width-thickness ratio, thickness of gusset plate and lap length of angel steel, vice-versa.