Experimental study on seismic performance of precast concrete frame structure with specially shaped column of grouting connection at different axial compression ratios

Abstract

In order to study the seismic performance of the precast concrete specially shaped column frame structure at different axial compression ratios, full−size specimens PCFS1 and PCFS2 with axial compression ratios of 0.14 and 0.28 respectively were designed and prepared by using the scheme of "grouting connection and the post−cast beam−column joint" to carry out low reversed cyclic loading test. The results show that the scheme of "grouting connection and the post−cast beam−column joint" is safe and reliable. The specimens PCFS1 and PCFS2 are initially cracked at the grouting opening holes at the column foot of the first floor and vertical splicing at both ends of the beam, respectively. The failure mode of the structure is mainly beam hinge failure. The hysteretic curves show an inverse "S" shape. With the increase of axial compression ratio, the slip phenomenon is weakened, the squeezing phenomenon appears, and the ultimate deformation capacity, energy dissipation capacity and the ductility all decrease. However, they all show good bearing stability capacity and energy dissipation capacity, which meet the requirements of the ductile frame. The ultimate elastic−plastic interlayer displacement angles for each floor and the whole structures of two specimens all meet seismic fortification limit requirements of "no collapse during strong earthquake". In practical application of the precast concrete frame structure with specially shaped column of grouting connection, it is suggested to take effective measures to delay the appearance of first crack, and the overall spatial effect of the structure also need to be considered in elastic analysis.