Analysis On Load And Resistance Factors In General Design Expression

Probabilistic limit state method based on the probabilistic theory is currently accepted worldwide which is mostly used in international standard and European codes. China was one of the countries where limit state design method was adopted in the early times of the 19th. But there are some limitations in application range of the applied design expression which is the current limit state design method. If there is a new type of building material or live load, current LRFD method will not be suitable, which will be supposed to retard the application of new technology to some extent. The purpose of the paper is to improve the applied design expression and establish the general design expression.The applied expression was established based on the statistical data sampled on the eighties of the 20th, and correspondent partial factors were analyzed according to special members and materials. As for a new type of material or members, current LRFD method is not suitable, and will block the development of new technology or even. To develop the applied design method, this paper presents a general limit state method to calculate load factors and resistance factors based on probabilistic theory and numerical analysis. The design method, called general design expression for short, is similar in form to the applied design expression but different in nature. Additionally the method is more convenient for designers and more assorted with reliability index, and has greater range of application than the applied expression.The research results in the paper will promote the application of the limit state design method in practical engineering, and meanwhile it will make an applied reference for the development of structural reliability in theory.