This paper discusses the crack property and the stress distribition of tensile zone of composite concrete member.Steel plate is embedded at the center of specimens (40cm wide, 61.6cm high and 4.0m long), and the longitudinal tensile force is partly transferred from steel plate to reinforcement (φ16mm, deformed bars).
　Test results show as follows:
(1) The longitudinal tensile force is divided into steel plate and reinforcement in proportion to each sectional area.
(2) Steel connectors (H-type frame, dowel) welded to steel plate do not greatly influence the crack characteristic and the stress distribution along the composite members.
(3) Maximum crack width can be estimated due to the equations proposed so far, considering that tensile zone is equivalent to the ordinal reinforced concrete members.
(4) Maximum crack width and residual crack width inrease quite slightly through several loading processes.