This paper presents an investigation on the seismic behaviors of two spatial reinforced-concrete (RC) frames: RC frame with cast in-situ slabs and RC frame without cast in-situ slabs. The main research content in the study is the effect of the slabs. Based on the seismic tests of 2 large-scale frames under low frequency cyclic lateral load, the failure pattern, bearing capacity, stiffness degradation, ductility, deformation characteristic and energy dissipation ability were investigated. The effect of the slabs on the seismic behavior of RC frames was also experimentally studied. The test results show that the bearing capacity of RC frame with cast in-situ slabs increase while the corresponding ductility decrease compared to those of the frame without slabs. However, the energy dissipation ability changes slightly with the variation of slab effects. It is found that the failure pattern of RC frame without slabs is "strong column weak beam failure" while the failure patterns of the RC frame with slabs almost turn into the "story failure". Research findings also indicate that the development of the bearing capacity degradation and the stiffness degradation changes due to the effect of slabs and all the RC frames exhibit good seismic behavior.
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