Seismic performance of steel reinforced ultra high-strength concrete composite frame joints |
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| Authors: | Changwang Yan Jinqing Jia |
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| Institution: | [1]School of Mining and Technology, Inner Mongolia University of Technology, Huhhot, 010062, China [2]State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China |
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| Abstract: | To investigate the seismic performance of a composite frame comprised of steel reinforced ultra high-strength concrete (SRUHSC)
columns and steel reinforced concrete (SRC) beams, six interior frame joint specimens were designed and tested under low cyclically
lateral load. The effects of the axial load ratio and volumetric stirrup ratio were studied on the characteristics of the
frame joint performance including crack pattern, failure mode, ductility, energy dissipation capacity, strength degradation
and rigidity degradation. It was found that all joint specimens behaved in a ductile manner with flexural-shear failure in
the joint core region while plastic hinges appeared at the beam ends. The ductility and energy absorption capacity of joints
increased as the axial load ratio decreased and the volumetric stirrup ratio increased. The displacement ductility coefficient
and equivalent damping coefficient of the joints fell between the corresponding coefficients of the steel reinforced concrete
(SRC) frame joint and RC frame joint. The axial load ratio and volumetric stirrup ratio have less influence on the strength
degradation and more influence on the stiffness degradation. The stiffness of the joint degrades more significantly for a
low volumetric stirrup ratio and high axial load ratio. The characteristics obtained from the SRUHSC composite frame joint
specimens with better seismic performance may be a useful reference in future engineering applications. |
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| Keywords: | cyclical test axial load ratio volumetric stirrup ratio ductility strength degradation stiffness degradation steel reinforced ultra high strength concrete beam-column joint |
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