Second-Order Stochastic Response Analysis Of Steel Braced Frame Structures In Highrise Buildings

Steel structures are an economic and effective structural type of highrise buildings, especially in seismic area. Steel braced frame structure is widely used in highrise steel structure buildings because that it can coordinate the mechanic behavior of frame element and brace element. The second-order analysis of structures is an unavoid problem in the analysis of highrise buildings, and the analysis of structures in undefined load is an essential method to judge the security and reliability of structures. The problem of second-order stochastic response analysis of steel braced frame structures in highrise buildings is researched in this paper. First , in the analysis of steel braced frame structures in the highrise buildings, the plane structural analysis method is selected in this paper, and the fame and the brace is separately to be considered, which are pin-connected by the horizontal bar, because that it is very difficult to select the restoring force models of the members in the unit action of bending, shearing and twisting in the nonlinear dynamic response analysis in highrise buildings. And it is very difficult to predict the input direction of the earthquake and wind loads because that they are themselves multi-dimensional and stochastic . There are many more nonlinear mechanical analysis models of frame bar element, the Giberson simple component model is selected in this paper . Two nonlinear springs in the ends of the bar can be used to consider the nonlinear working state because that the nonlinear distribution in the bar is assumed to be concentrated in the zero length range in the ends of the bar. There are seldom dynamic analysis models of the brace element in the analysis of concrete shear wall, a type of three element model is proposed in this paper, in which the bending spring, shearing spring and axial spring, in the middle axial of the brace element respectively indicate the bending deformation, shearing deformation and axial deformation of the steel braced structures. It is not only that the second-order effect of the axial force is considered, but also that the effect of the material nonlinear is considered. Second , in this paper, taking dynamical wind force as the zero-mean Gaussian stationary random process, and the modified random process model of earthquake...