Response analysis of large-span isolated structures based on the random factor method

Combined with the equivalent linearization technique, the random factor method was applied to analyse multi-degree-of-freedom nonlinear isolated structures. Four random factor, namely the yield displacement, area, pressure and height of the isolation bearing were chosen to consider the randomness of isolation layer stiffness and structural mass. The relationships between the four basic random variables and the structural stiffness and mass were established by using the method provided. The computational expressions of the structural displacement response were deduced by using the algebra synthetic method. Then a long-span isolated structure was analysed based on the improved random factor method and some beneficial conclusions were obtained.