NEHRP Clearinghouse
- Title
- Computer Program Using Beam Elements for the Nonlinear, Dynamic Analysis of Lumped Parameter Models.
- File
- PB93214484.pdf
- Author(s)
- Kariotis, J. C.; Waqfi, O. M.; Ewing, R. D.
- Source
- National Science Foundation, Washington, DC., February 1992, 96 p.
- Identifying Number(s)
- REPT-2.3-5
- Abstract
- 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.
- Keywords
- Equations of motion; Displacement; Loads (Forces); Damping; Nonlinear systems; Masonry; Concrete; Matrices (Mathematics); Algorithms; LPM/II computer program; Stiffness; Beams (Supports); Walls; Dynamic response; Degrees of freedom; Earthquake engineering; Boundary conditions; Computer programs; Reinforcement (Structures); Mechanical properties; Dynamic structural analysis