Experimental study on the seismic response of braced reinforced concrete frame with irregular columns |
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Authors: | Jianzhuang Xiao Jie Li Jun Chen |
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Institution: | [1]Department of Building Engineering, Tongji University, Shanghai 200092, China [2]State Key Laboratory for Disaster Reduction in Civil Eng., Tongji University, Shanghai 200092, China |
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Abstract: | A 15-storey K-braced reinforced concrete model frame with irregular columns, i.e., T-shaped, L-shaped, as well as +-shaped
columns, was constructed and tested on the six-degree-of-freedom shaking table at the State Key Laboratory for Disaster Reduction
in Civil Engineering in Tongji, China. Two types of earthquake records, El-Centro wave (south-north direction) and Shanghai
artifi cial wave (SHAW) with various peak accelerations and principal-secondary sequences, were input and experimentally studied.
Based on the shaking table tests and theoretical analysis, several observations can be made. The failure sequence of the model
structure is brace→beam→column→joints, so that the design philosophy for several lines of defense has been achieved. Earthquake
waves with different spectrums not only infl uence the magnitude and distribution of the earthquake force and the storey shear
force, but also obviously affect the magnitude of the displacement response. The aftershock seismic response of previously
damaged reinforced concrete braced frames with irregular columns possesses the equivalent elastic performance characteristic.
Generally speaking, from the aspects of failure features and drift ratio, this type of reinforced concrete structure provides
adequate earthquake resistance and can be promoted for use in China. |
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Keywords: | seismic response reinforced concrete braced frame irregular columns |
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