Computer Program Using Beam Elements for the Nonlinear, Dynamic Analysis ofLumped Parameter Models

摘要

LPM/II is a general nonlinear dynamic analysis code developed for multi-degree-of-freedom (MDOF) structural systems. The principal use envisaged is the analysis of reinforced masonry or concrete walls. LPM/II is similar to and is based on elastic beam behavior but routines for incorporating the nonlinear properties of reinforced masonry or concrete represented as stiffness degradation is a feature of the analysis program. The nonlinear code uses acceleration-time, velocity-time or force-time records as the dynamic loading. The stiffness/displacement relationship of each sub-element of the MDOF system is determined independently by a nonlinear analysis program such as FEM/1 (Ewing, 1987, 1990). The code updates the stiffness of the system, if needed, for each time step of the dynamic loading. LPM/II is suitable for the analysis of the dynamic behavior of reinforced masonry and concrete shear walls.