| In the reinforced concrete structure of modern large-scale thermal power plants, due to the large installed capacity, columns and beams usually have large cross-section height to carry heavy vertical loads. Besides, with the requirements of industrial processes, ultrashort columns with shear span ratio lesss than 1.5 were formed in parts of the structues. Comparing with the columns of general frame structure, untra-short columns have bigger lateral stiffness and worse ductility. Meanwhile, untra-short columns may carry higher level of horizontal forces under earthquake action. What mentioned above will affect the seismic performance of the whole structure.Experimental research on the square and circular tubed confined reinfored concrete showed that this kind of column with low shear span ratio has good ductibility even under high axial compression ratio. Accordingly, a improvement program with tubed reinforced concrete untra-short columns was presented and a series of numerical tests ware proceeded to research the seismic performance and the effect of tubed of a spercific structure. The main contents of this article are as follows:(1) A reinforced concrete ultra-short column was made and its seismic performance was researched through discussing its hysteresis curve, stiffness degradation, energy dissipation capacity and deformation capacity.(2) Aarameter analysis based on finite element models built by Abaqus software is performed to research the effect of influential factor, including width-thickness ratio, load direction, strengh of concrete and stirrup ratio, to the bearing capacity of specimens.(3) A finite element models of thermal power plant tith tubed reinforced concrete system was built to research the effect of tubed reinforced concrete to inelastic story drift, shear bearing capacity and other seismic responses by comparing responses of structres with tubed RC ultra short columns and ordinary reinforced concrete ones. |
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