| Due to staggered arrangement of the truss along the vertical plane in the building of steel staggered structures, the floor slab would not only bear and transfer the vertical loads, but also the lateral loads from the upper truss to the adjacent lower one, so it is critical to the gloable behaviors of the structure. As the study in theory was very rare and no reports were founded in model test, the test research in this paper had great value in theory and in practice.As a part of the subject "Research on failure mechanism of the concrete slab in Steel Staggered Truss System and the improved slab type", which belongs to the item of "Development of Application Technology of Staggered Truss System" sponsored by the Ministry of Science and Technology, this paper focused on the bearing capacity and failure mechanism of the concrete slab in steel staggered truss structures under cyclis-loading. The aim of the paper was to give some suggestions on shear distribution of the slab and the arrangement of the shear connectors, and to provide safty and economy technical measurements to ensure the safety of the steel staggered truss system under lateral loads. The results will be helpful to the application of the new system.First, a 18-story steel staggered truss structure was designed by program ETABS, then 1:3 scale model was subtracted from the structure, and monotonous behavior of the model was analyzed by ANSYS. Based on the result, the quasi-static experimental scheme and strain guage arrangement were designed. After that, the test was carried out and shear capacity was analyzed. The load-displacement hysteretic curve appeared stable and in diamond shape which indicated that the slab without weakening had high bearing capcity and can be assumed as rigidity. The failure mode of the slab may be in closed relation to the strength and stiffness of truss with out-of-plane bending of the slab by comparison with the structure test. The conclusions may be referenced to the further research.
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