ECC/RC空心楼盖板柱节点抗冲切性能-《建筑科学与工程学报》

文章信息/Info

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

摘要:: 针对工程水泥基复合材料（ECC）用于板柱结构柱周围局部实心区域形成的ECC/RC空心楼盖板柱节点，可减少结构本身自重，充分发挥ECC材料高强度、高延性和抗剪性能好等特点，以ECC强度、ECC面积、暗梁为参数，对ECC/RC空心楼盖板柱节点进行抗冲切性能数值分析研究。结果表明：ECC材料可显著提高空心楼盖板柱节点的抗冲切承载力和刚度，改善节点的变形能力和耗能能力，但未改变节点的破坏形态，节点仍发生冲切破坏；节点的抗冲切承载力随着ECC强度和ECC面积的提高而增大；当节点仅使用一种增强方式时，暗梁和ECC材料的抗冲切承载力分别为普通混凝土的1.26倍和1.15倍；与暗梁相比，ECC材料对节点抗冲切承载力的提高效果更明显；与同时使用ECC材料和暗梁的节点相比，当节点仅使用ECC材料时，增大ECC面积对节点抗冲切承载力的提高效果更为明显；在进行空心楼盖板柱结构设计时，建议同时使用暗梁和ECC材料，保证节点有较高极限承载力的同时，兼顾良好的变形能力和耗能能力。

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.