Second-order Analysis Method For Steel Frames Using Chinese Steel Specification

Traditional structural analysis and design methods have many limitations，withthe development of computer technology and the improvement of structural analysistheory; the advanced analysis and design will become the major method in the future.But it has important theoretical significance and engineering application value toimprove and perfect the existing structural analysis and design method.In this paper， in order to check the second order elastic analysis design methodand the simplified design method of second-order elastic analysis， some directimperfection models were established. By this way， the accuracy method inconsidering the initial imperfection with the notional lateral loads was studied. At thesame， the influences of the ratio of the second order effect coefficient and the frameheight and span to the second order elastic analysis design method and the simplifieddesign method of second-order elastic analysis. The following are the main contentsin detail：Firstly， this paper introduces the method of national standard for thesecond-order elastic analysis of regulation，the second-order elastic analysis methodof using conditions，and the imaginary horizontal force value，and introduces thespecification recommended to design the second-order elastic analysis and simplifythe second-order elastic analysis of the design process.Secondly，some frame models were elected. Then the finite element analyticalmodels were established according the rules. The accuracy of the method was studiedby comparing the results of the methods，and the influence rules of the parameterswere found. And also，whether the notional lateral loads can well consider the initialimperfections were studied.Thirdly，by providing a framework for the action of wind load and earthquakeanalysis, verified the influence law of the result of the analysis...