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This paper presents a general model for the design to obtain the thickness and reinforcing steel areas of rectangular footings that support from 1 to "n" columns aligned on a longitudinal axis. The pressure diagram is considered linear. Some recently published papers are restricted to certain types of footings as the rectangular isolated footings, and rectangular combined footings that support two columns. The first part of this paper shows the minimum soil area that supports 1 to "n" columnsdoi:10.15446/dyna.v89n223.100030 fatcat:bmcybk547nhetd6cao4ad3gcye