Abstract
Progressive collapse behavior of case-in-place concrete and steel frame structures has been extensively investigated over the past years. However, studies on progressive collapse resistance and characteristics of prefabricated RCS composite frame structure (space frame) are limited. In this study, a half-scale prefabricated RCS space frame structure (two-storey, 1 × 2-bay) was designed and manufactured and then tested through the sudden failure of the long-side central column. The weakened part of failure column was rapidly pulled out using vehicle traction force, and displacement was obtained with a dynamic data acquisition instrument supplemented by high-speed camera to record the deformation process of the structure. Additionally, the remaining structure displacement variation and the beam-to-column connections of fem model under progressive collapse were simulated using SAP2000. The FEA results were compared with the experimental results to verify the effectiveness of the numerical analysis. Experimental results demonstrated that the prefabricated RCS composite frame structure designed in accordance with Chinese building codes shows improved resistance to progressive collapse. The dynamic effect demonstrates no significant influence on the prefabricated RCS composite frame structure, and the suggested dynamic amplification coefficient is 1.28. Steel plates (A, B, and C) of the beam-to-column connection are the weak part of the structural failure, and appropriate measures should be applied to strengthen the steel plate of the beam-to-column connection when the prefabricated RCS composite frame structure is designed to resist progressive collapse. SAP2000 FEM program verified that the numerical simulation results are basically consistent with the experimental results.
Highlights
E spread of an initial local failure from element to element eventually results in the collapse of an entire structure or a disproportionately large part of it. is phenomenon is called progressive collapse. e majority of studies on prefabricated RCS composite frame structures focus on the connection structure of steel beam-reinforced concrete column, joint shear mechanism [2], and seismic performance
Experimental Program e beam-to-column connection of the prototype of fabricated RCS composite frame structure adopts the “new RCS beam-to-column connection” [20], which was developed by our research group. e A–B span at the bottom of the fabricated two-storey RCS composite frame structure prototype was used as the experimental model and scaled down to one-half
0.0 0 1 2 3 4 5 6 7 8 9 10 Time (s) Experimental numerical Finite-element numerical (c) where Rd is the dynamic amplification factor, ymax is the peak displacement, yst is the static displacement. e maximum Rd is at column 2A, where ymax 4.07 mm, yst 3.19 mm, and Rd 1.27586. erefore, we suggest that Rd is 1.28
Summary
Prefabricated reinforced concrete column-steel beam composite frame structure, referred to as prefabricated RCS composite frame structure, comprises precast reinforced concrete columns, steel beams, and composite floor slabs in the building site and is an important branch of the assembly structure system. e prefabricated RCS composite frame structure can optimize advantages of steel and reinforced concrete members, is a low-cost and high-efficiency structural style [1] with broad development prospects, and is a dominant structural system in line with the development trend of construction industrialization. E majority of studies on prefabricated RCS composite frame structures focus on the connection structure of steel beam-reinforced concrete column, joint shear mechanism [2], and seismic performance. E “new RCS beam-to-column connection” [20] is used as the beam-to-column connection type of the experimental model, and a half-scale prefabricated RCS space frame structure (two-storey, 1 × 2-bay) is manufactured in this study. 2. Experimental Program e beam-to-column connection of the prototype of fabricated RCS composite frame structure adopts the “new RCS beam-to-column connection” [20], which was developed by our research group. E A–B span at the bottom of the fabricated two-storey RCS composite frame structure prototype was used as the experimental model and scaled down to one-half, and the membrane effect of the slab was not considered.
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