This paper offers a set of partial differential equations designed to enable static analysis of incomplete composite plates with regard to the thickness of a steel plate. The paper also analyzes the relationship of lateral deflections among complete composite plates, incomplete composite plates. and individual plates that do not interact with regard to simply supported rectangular composite plates; beta = 0 signifies complete composite plates, 0 < beta < 1 signifies incomplete composite plates, and beta = 1 signifies individual plates that do not interact. The paper also submits a diagram that represents the essential features of the lateral deflection characteristics of simply supported rectangular incomplete composite plates that will be found suitable for most design purposes. Lateral deflections can be derived by the use of the diagram without too much difficulty. The present method can also be applied to the finding of lateral deflections undergone by continuous incomplete composite plates and other types of load.
