Seismic Behavior of Ecc/Rc Composite Frames

Abstract eng:
Engineered cementitious composites (ECC) is a special type of high performance fiber reinforced cementitious composites featuring strain hardening and significant tensile ductility, which are desirable characteristics for it to act as a substitute for normal concrete to improve the deformability and suppress brittle failure of critical structural elements, such as beamcolumn joints or short columns. A form of ECC/RC composite frame in which normal concrete both in beam-column joint zones and column bases in the ground floor were substituted with ECC, was proposed to relax the requirement of transverse reinforcement in the joint core and to improve the seismic performance of the frame. The seismic behavior of ECC/RC composite frame was evaluated through the pushover analysis, and the seismic behavior of frames with different typical ECC mixes and concrete were compared. Results indicated that the strategic use of ECC in the frame could reduce the distribution range of plastic hinges, decrease the inter-story drift with relatively large plastic deformation, and mitigate the earthquake damage.

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