The Analysis Of Design Parameters For High Performance Structure Steel Q345GJ

Along with high rise and long span steel buildings are rapidly developing in big cities in our country, the material used in steel structure is updating gradually, in domestic, Wu Yang Iron and Steel Co.Ltd of Han Dan Iron and Steel Group have produced high quality steel for buidings——high performance structure steel firstly and independently. As this steel not only has high strength, but also has low yield ratio, so, Firstly, it has nicer capability of earthquake resistance. Secondly, it has excellent general mechanical properties and weldability. At last ,it has narrow yeild point wave zone and good z-direction property. For all of above, it can solve some problems occured in high rise building which used traditional steel plate. But its design characteristics are still blank in our country's design codes. For generalize this high performance stell and realize high performance steel to be used in right manner and make it to be written in <>, this paper will give some resistance partial coefficients and recommended design strength value based on test and analyses.Briefly introduces the basic concept of engineering structure reliability and reviews the history of research of reliability theory. Some practical methods for analysis of reliability for building structures are valued. the influential factors of resistance partial coefficients of the steel constructures'each component are anaiysesed and the methods for calculating the coefficients of reliability design are proposed.At the base of the material properties parameter eigenvalues of Q345GJ by the test, the paper achieves resistance partial coefficients of Q345GJ generaly by analysing the reliability of each structure member under the different load case.The paper calculate the safty index of all kinds of structure menbers in reverse by using analysed resistance partial coefficients and << Unified standard for reliability design of building structures>>(GB50068-2001) as well as <>(GB50009-2001). It indicate that some values of safety index are lower in some lode case, and gives a brif analysis.Aiming at sovling the problem that the safety index is lower under the combination of load case which contains wind load, this paper gives a method to modify the safety index, and slove this problem effictively.For the sake of economy, this paper give the different resistance partial coefficients for different structure members in different load cases at the base of plentiful analyses. It indicates that this method is obvious economical, and can give a reference for design.