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Abstract
This paper aims to provide an experimental support on seismic performance evaluation of the steel braced truss-RC (reinforced concrete) column hybrid structure, which could be applied as the air-cooled supporting structural system in large-capacity thermal power plants located in strong earthquake prone regions. A series of pseudo-dynamic tests (PDTs) and quasi-static tests (QSTs) were performed on a 1/8-scaled sub-structure. The dynamic characteristics, lateral deformation patterns, deterioration behavior, hysteretic behavior and failure mechanisms were investigated. Test results showed that the first vibration mode is torsion, which is caused by the small torsional stiffness of this kind of hybrid structure. The lateral deformation shape is shear mode, and the drift ratio of the structure above the corbel is significantly less than that of the column below the corbel. Earthquake energy is mainly dissipated by the RC pipe columns where cracks mainly occurred at the bottom of column and lower part of corbel. The failure mechanisms were identified indicating that the steel braces improved the global stiffness and modified the load transfer mechanism. This study affirms that the steel braced truss-RC column hybrid structure has the sufficient ductility and good energy dissipation capacity to satisfy the design requirements in high seismic regions.
Highlights
Steel-concrete hybrid structures obtained through the combination of structural components made of reinforced concrete, steel and composite steel-concrete have been investigated much in the past two decades [1,2,3]
Space steel truss about 4 ~ 8 m-height is supported by the columns, and a range of large-diameter
Space steel truss about 4~8 m-height is supported by the columns, and a range of large-diameter draught fans are installed inside the space steel truss
Summary
Steel-concrete hybrid structures obtained through the combination of structural components made of reinforced concrete, steel and composite steel-concrete have been investigated much in the past two decades [1,2,3]. This paper focuses on a peculiar steel-concrete hybrid structure, namely steel truss-RC column hybrid structure, which is a supporting structure to house air-cooled condenser (ACC) in the thermal power plant (TPP). It has been identified as a type of structure suitable for the application of water-saving ACC technology to TPPs. It has been identified as a type of structure suitable for the application of water-saving ACC technology to TPPs For this kind of structure, the lower parts are an array of large-scale thin-walled RC pipe columns, used to support the upper sub-structures and industrial facilities. A space steel truss about 4 ~ 8 m-height is supported by the columns, and a range of large-diameter
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