Research Of Stability Of Steel Members In Different Engineering Environment

In this paper, based on the results of existing research at home and abroad, according to the structural characteristics of steel components and the conditions of practical application, it is addressed that the establishment of the finite element model of the static and dynamic stability analysis of the steel components, citing a suitable steel bar parts in modular form, and determination of the load formation and the mode of action.The paper summarizes the theoretical calculations, under a high temperature environment, of the influence of the lateral elastic constraints to the length stability of steel columns, and the comparison of the critical threshold value and the deformation of the analytic solution and the finite element numerical solutions of steel parts on the vertical static load. The static characteristic is calculated under the fixed constraints, the different cross-sectional forms, the fixed temperature, and the two kinds of calculations are compared and analyzed.In this paper, the harmonic force of steel bar that is in the vertical was carried out under the influence of dynamic stability analysis, I concrete analyzed the instability range of incentives vibration, the impact of parameters on the rod affected by the vibration amplitude, different elastic lateral support brought impact on the Dynamic Stability of bars and so on. The frequencies of steel parts in different working environments calculated by finite element method and a number of former fundamental mode of vibration were compared with analytical values.based on the influence on the frequency that was brought in different elastic rod lateral supported,obtained the results through comparing resonance analytical calculation with numerical calculation.In this paper, using the theory of structural stability to discuss the steel columns' dynamic characteristics in the heat-mechanical coupled and analyze the temperature, the damping force, the effect shot size, excitation frequency and vertical inertial force on the Dynamic Stability of steel columns impact and proposed to avoid or reduce the steel column resonance measures. Derive the high temperature (fire) environment, the critical dynamic stability bar dynamic load on the steel bar to be determined after the thermal field analysis of some vibration parameters on the critical dynamic load effects.Through theoretically analyzing and calculating the examples the steel members in different project environment, I have obtained the practical significance research results which will provide some theoretical bases and optimization method with the design and promotion of the steel bar.