钢筋网高性能复合砂浆加固钢筋混凝土方柱抗震性能的研究

Study on seismic behavior of RC square columns strengthened using high-performance composite mortar reinforced with mesh reinforcements

通过4根钢筋混凝土近似足尺方柱在不变轴力和周期水平反复荷载作用下受力性能的试验研究,验证了用钢筋网高性能复合砂浆(CMMR)加固钢筋混凝土柱以提高其抗震性能的有效性:不仅柱的抗震承载能力有明显提高,而且其抗震延性有大幅度改善,抗震耗能能力也有一定程度的增强。本文先对试验结果进行了描述,然后研究了轴压比变化、加固后截面形式改变、用无钢筋网增强的素砂浆加固等因素对抗震加固效果的影响,并对这种加固层提高钢筋混凝土柱抗震性能的作用机理及被加固柱的裂缝形态进行了分析。

Based on the experiment of four RC approximate full-size square columns under constant axial loading and lateral cyclic loading, the effectiveness of strengthening RC columns using high-performance composite mortar reinforced with mesh reinforcements （CMMR） for improving seismic behavior was examined. The strengthened columns demonstrated obvious increase in seismic load-bearing capacity, greater degree of improvement in seismic ductility and energy dissipation capability.It is a good strengthening way for greater degree of improving both of seismic load-bearing capacity and ductility that square or rectangular section columns are strengthened with circular CMMR jackets after the concrete cover of the four comers being dislodged. Increase axial compression ratio of the strengthening column can improve the seismic load-bearing capacity, enhance the energy dissipation ability in each loading period, but decrease the displacement ductility. Mesh reinforcements and ductile composite mortar containing fiber can strengthening columns. The effect of strengthening obviously improve the mode of longitudinal and transverse cracks of the columns with only plain composite mortar is not obvious.