Abstract
In this study, the seismic behavior of low-rise self-centering (SC) prestressed concrete frames considering soil-structure interaction (SSI) is presented. For this purpose, a typical 4-story SC concrete frame, with and without flexible foundations, is analyzed through nonlinear dynamic analysis. Ground motion sets with two hazard levels are selected for analysis. A conventional reinforced concrete (RC) frame is also studied, and the structural demands of the RC and SC frames are compared in terms of peak and residual drifts, base shear, residual settlement, and rotation of foundation. The analysis results show that considering soil-structure interaction generally increases the peak and residual drift demands and reduces the base shear and connection rotation demands when compared to fixed base conditions. For the cases with and without flexible foundations, the SC frame is found to have comparable peak story drifts with the RC frame and have the inherent potential of significantly reducing the residual drifts. The seismic analysis results of the frames with flexible bases show that the RC and SC frames can experience foundation damage due to excessive residual foundation rotations after the maximum considered earthquake (MCE).
Highlights
Among various natural hazards, earthquakes represent one of the most devastating disasters which can induce overwhelming damage to civil infrastructure
Among the different self-centering systems, self-centering concrete frames can be used as alternatives to conventional reinforced concrete (RC) frames. e early versions of SC concrete frames use unbonded PT steel to connect the precast beam and column and provide the self-centering capability [11], and the gap opening/closing behavior is allowed at the interface between the beam and column
Despite the fact that soil-structure interaction (SSI) has significant influence on the seismic responses of structures [21,22,23,24,25], little investigation is performed to study the effect of SSI on self-centering concrete frames. erefore, taking a low-rise 4-story frame building as an example, this paper analytically investigates the seismic behavior of selfcentering concrete frames with the consideration of SSI
Summary
Earthquakes represent one of the most devastating disasters which can induce overwhelming damage to civil infrastructure. E early versions of SC concrete frames use unbonded PT steel to connect the precast beam and column and provide the self-centering capability [11], and the gap opening/closing behavior is allowed at the interface between the beam and column. Song et al [16, 17] proposed a novel SC concrete frame, which uses unbonded PT tendons to provide self-centering capability and bolted web friction devices (WFDs) to dissipate energy in earthquakes. A typical SC concrete frame with web friction devices (WFDs) [16] is illustrated, where the precast concrete beams are connected to columns using horizontally-oriented unbonded PT tendons, which provide the selfcentering capability of the frame under seismic loading.
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