3D BASIS Origins, Novel Developments and Its Impact in Real Projects Around the World

摘要: Origins and development of 3D-BASIS (3-Dimensional BASe Isolated Structures) was initially envisioned by the need for an efficient tool nonlinear dynamic analysis three-dimensional base isolated structures, particularly in solving highly bidirectional stick-slip hysteretic response a collection sliding isolation bearings resulting superstructure, as this not available at that time. The primary challenge to solve behavior friction bearings—modeled using differential equation (Bouc-Wen Model) due its efficiency representing constant Coulomb or variable velocity depended very small yield displacement during stick phase high tangential stiffness followed phase—and stiff equations. A is compounded when biaxial-friction modeled, wherein even traditional method Gear’s equations breaks down—a problem vexing research team University Buffalo trying answer novel pseudo-force solution algorithm along with semi-implicit Runge-Kutta difficult problem. procedure needed primarily system consisting (1) and/or elastomeric bearings, (2) fluid dampers, (3) other energy dissipation devices, while superstructure represented three dimensional model appropriately condensed (where only master nodes center mass floor are retained). This chapter describes origins, impact.