Abstract
The purpose of this study is to develope a simple theory of allowing for compressive membrane action in the elastic-plastic analysis of square reinforced concrete slabs with partial lateral restraint at all edges by using a equivalent cross beam structure. And the load-deflection relationship obtained from the analysis are compared with the test results of nine concentrated loaded square slabs in which lateral displacement at the boundaries is prevented by very stiff surrounding frame. Consequently, it is shown that the approximate method using a equivalent cross beam structure can pursue the load-deflection curves obtained from tests.
