This paper examines if the steel-concrete composite structure can be applied to the rock-shed structure or not from the view points of four impact tests. Four kinds of experimental studies, i.e., 1) impact tests of steel-concrete composite beams filled with rigid urethane, 2) high speed loading tests of open san witch composite beams, 3) high speed punching shear tests o steel-concrete composite slabs and 4) high speed shear loading tests of stud bolts were carried out. From these tests, it is found that the steel-concrete composite structures have both high strength and deformability under impact and high speed loadings. Therefore, it is recognized that the steel-concrete composite structure will be useful for the rockshed under severe rock-fall condition.
