Abstract

After the ground motion, a large number of columns remain intact and can be retrofitted and reused. In this paper, to explore the effects of the loading scenario, predamage level and strengthening measures on the seismic performance of reinforced concrete (RC) columns, seven predamaged specimens strengthened with high-performance ferrocement laminate (HPFL) and bond steel plate (BSP) were tested. The results show that the bearing capacity, ductility, single-cycle energy dissipation and stiffness of all the predamaged specimens can be effectively restored and improved by this strengthening method for different loading cases. This strengthening method also significantly improves the shear capacity and changes the failure modes of the predamaged strengthened specimens from those of the corresponding predamaged unstrengthened specimens. The vertical eccentricity only slightly affects the seismic behavior of the specimens, while the horizontal eccentricity significantly increases the length of the failure region and reduces the seismic behavior of the specimens, considering the bearing capacity, energy dissipation capacity, and stiffness. The effects of different predamage levels are unique.

摘要

地面运动后，大量柱子保持完好，可以改造和重复使用。在本文中，为了探讨加载情景、预损伤水平和加固措施对钢筋混凝土 (RC) 柱抗震性能的影响，7 个用高性能钢筋水泥 (HPFL) 和粘结钢板 (BSP) 加固的预损伤试件进行了测试。结果表明，该加固方法在不同载荷工况下，所有预损伤试件的承载力、延性、单循环耗能和刚度均得到有效恢复和提高。这种强化方法还显着提高了抗剪能力，并改变了预损伤强化试件的破坏模式，而不是相应的预损伤未强化试件的破坏模式。考虑到承载能力、能量耗散能力和刚度，垂直偏心对试件的抗震性能影响很小，而水平偏心显着增加了破坏区域的长度并降低了试件的抗震性能。不同伤害前等级的效果是独一无二的。