In previous researches, composite structure system made of rammed earth and steel member has been proposed, and mechanical properties and deformation behavior were investigated. This paper suggests an improved composite structural system made of rammed earth and light wight steel member. From the loading tests and a finite element analysis as parameter with states of open/close of wall and thickness of steel, the effective resistant mechanism with adjacent composite structure blocks is appeared, and the combined effect for strength and rigidity is obtained. From analytical results, the relationship between the stress state and the thickness of steel members is investigated.
