ABSTRACT
Grid-mass models are often used to simulate the dynamic response of real plane-grid structures, where grid members may be assumed to be weightless, with all their mass lumped at discrete points on the grid; usually, the member intersections provide, with reasonable accuracy, convenient lumping sites for the distributed mass of the individual members. Such approximate models are particularly appropriate for rectangular and square grids consisting of two mutually perpendicular families of evenly spaced parallel members.
