高韧性树脂钢丝网混凝土侧面加固RC偏压柱试验研究

Experimental Study of RC Eccentric Compression Columns with Side Reinforcement by High Toughness Resin Concrete with Steel Mesh

为探究超强高韧性树脂钢丝网混凝土(HTRCS)加固技术对拱桥拱肋的加固效果,设计制作6根钢筋混凝土柱试件进行偏心受压试验,研究加固前、后钢筋混凝土柱在偏心压力作用下的裂缝发展、破坏形式、开裂荷载和承载力、荷载~侧向挠度曲线等,并分析加固层作用机理。结果表明:HTRCS加固不会改变钢筋混凝土偏心受压柱的破坏形态,但能有效地改善大偏心受压柱的裂缝发展形态;HTRCS加固能显著提高偏心受压柱的极限承载力和大偏心受压柱的抗裂性能,对于远轴侧加固的大偏心受压柱和近轴侧加固的小偏心受压柱,HTRCS加固效果最优;HTRCS加固能够提高偏心受压柱的刚度。

In order to study the reinforcement effect of high toughness resin concrete with steel mesh (HTRCS) on arch rib of arch bridge, we designed 6 reinforced concrete column specimens for eccentric compression tests. Meanwhile, we studied the crack development, failure mode, cracking load, bearing capacity, and load-lateral deflection curve of reinforced concrete columns before and after reinforcement under eccentric pressure, and analyzed the mechanism of reinforcement layer. The results show that HTRCS reinforcement will not change the failure mode of reinforced concrete eccentric compression columns, but it can effectively improve the crack development mode of large eccentric compression columns. HTRCS reinforcement can significantly improve the ultimate bearing capacity of eccentric compression columns and the crack resistance of large eccentric compression columns. The reinforcement of HTRCS is the most effective for the large compression eccentric column reinforced on the abaxial side (a side far from the axis) and the small eccentric compression column reinforced on the adaxial side (a side near the axis). HTRCS reinforcement can improve the stiffness of eccentric compression columns.