Analysis Of The Stability Of The Main Frame Structure Of The Steel Arch Gate And Study On The Practical Calculating Method

The stability of the steel structure is an important factor leading to the structure destruction and the elastic stability of the steel frame structure is a predominant topic in the fields of steel structure. Although the theoretical research have relatively grown up, some issues still exist, especially the theory on no-linearity. In order to solve those problems, this article adopts the energy method to analyze the stability of the major frame of steel arch gate to make up the weakness in the current standards and found the calculating models of the stability of the whole major frame of the steel arch gate. It also presents the general formula for calculating the eigenvalue and the precise equation of the calculating the length coefficient of the steel arch gate frame by using the energy method and choosing the proper experiment function. Furthermore, it gives a convenient practical calculating formula based on the models above. With the support of the study above, this dissertation shows us the second-order analysis method of the elastic-plastic stability of steel arch gate. The following is the main research procedures and achievements:1. Analyzing all kinds of the calculating methods for critical load of the structure stability by using the energy method.2. making use of the energy method to analyze and solve the issue of the elastic stability of the plane steel frame. Establishing the calculating models of the stability of the whole frame structure.3. According to eigenvalue equation(general formula) of the energy method of the plane steel frame structure stability ,and considering the restriction of the end of the column of the main steel frame and function of deflection curve gained from the differential balance equation general resolution, we get the equation for calculating the length coefficient of the main frame structure stability of the steel arch gate and the resolutions are also given.4. Choosing the reasonable deflection curve function. According to the energy method and the constrained condition of column end of the steel arch gate, the article presents a practical calculating formula for the stability of the main frame structure of the steel arch gate.5. This paper analyzes and modifies all the factors influencing the stability such as elastoplasticity, horizontal loads and asymmetry loads.6. This paper presents a practical second-order method of the stability of main frame of the steel arch gate by combining the virtues of calculating length method.