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Collapse Resistance of a Seven-Story Structure with Multiple Shear-Axial Column Failures Using Hybrid Simulation
The postfailure behavior of nonductile reinforced concrete columns under seismic loadings, and the system-level behaviors that can resist collapse after such failures, are not well understood due in part to limitations in the available experimental data. In this study, a pseudodynamic hybrid simulation was performed in order to capture the response of a seven-story reinforced concrete frame structure (height to width ratio of 1.6) under unidirectional pulse-type ground motion. Two full-scale first story columns were physically tested, one of which was a corner column under additional compression due to overturning moment. Both columns experienced shear and axial failures and completely lost their lateral and vertical load-carrying capacities. In both columns, the measured lateral deformation within the damaged region was larger than the total additional column drift during shear failure, as other regions of the column unloaded. The separation of concrete across the failure plane is shown to have significant effects on axial strength and stiffness loss in the failing columns. The hybrid nature of the simulation allowed for system-level study, including the relative importance of the frames and floor system to load redistribution after column failure.
Collapse Resistance of a Seven-Story Structure with Multiple Shear-Axial Column Failures Using Hybrid Simulation
The postfailure behavior of nonductile reinforced concrete columns under seismic loadings, and the system-level behaviors that can resist collapse after such failures, are not well understood due in part to limitations in the available experimental data. In this study, a pseudodynamic hybrid simulation was performed in order to capture the response of a seven-story reinforced concrete frame structure (height to width ratio of 1.6) under unidirectional pulse-type ground motion. Two full-scale first story columns were physically tested, one of which was a corner column under additional compression due to overturning moment. Both columns experienced shear and axial failures and completely lost their lateral and vertical load-carrying capacities. In both columns, the measured lateral deformation within the damaged region was larger than the total additional column drift during shear failure, as other regions of the column unloaded. The separation of concrete across the failure plane is shown to have significant effects on axial strength and stiffness loss in the failing columns. The hybrid nature of the simulation allowed for system-level study, including the relative importance of the frames and floor system to load redistribution after column failure.
Collapse Resistance of a Seven-Story Structure with Multiple Shear-Axial Column Failures Using Hybrid Simulation
Murray, Justin A. (author) / Sasani, Mehrdad (author)
2017-01-31
Article (Journal)
Electronic Resource
Unknown
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