Abstract

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Title:: Punching Shear Behavior of ECC/RC Hollow Floor Slabcolumn Connection

Author(s):: DANG Long-ji; LIANG Shu-ting; PANG Rui; ZHU Xiao-jun; YANG Jian; School of Civil Engineering, Southeast University

Keywords:: ECC; punching shear capacity; numerical analysis; slab-column connection; hollow floor

Abstract:: Engineered cementitious composite (ECC) is used in local solid area around the column of slabcolumn structure to form ECC/RC hollow floor slabcolumn connection(HSEC), which not only has light weight structure, but also makes full use of the characteristic of high strength, high ductility and high shear strength of ECC. The punching shear behavior of HSEC was evaluated through numerical simulation analysis of ECC strength, ECC area and hidden beam. The results show that ECC can increase punching shear capacity and stiffness, improve plastic deformation capacity and energy dissipation capability, but cannot change the failure mode of HSEC, and the connection still has a punching shear failure. The punching shear capacity can be increased as ECC strength and ECC area increase. The punching shear capacities of specimens with ECC and hidden beam are 1.26 and 1.15 times of the punching shear capacity of normal concrete when the unique enhanced method is used. ECC has a better effect in improving the connections punching shear capacity in comparison with hidden beam. Comparing with the connections with ECC and hidden beam both, the connection with ECC only has a better effect on improving the punching shear capacity when increasing ECC area. In the hollow floor slabcolumn design, it is proposed that hidden beam and ECC are used to resist shear force and improve plastic deformation capacity and energy dissipation capability.