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提出采用高延性纤维混凝土(HDC)改善低矮剪力墙的抗震性能和变形能力,设计了2个HDC低矮剪力墙试件,并进行了拟静力试验,研究其破坏机理、变形能力及耗能能力。试验结果表明:HDC低矮剪力墙破坏时,墙体中下部剪切斜裂缝宽度较小,说明HDC材料的受拉应变硬化和多裂缝开展性能,可有效控制剪切斜裂缝的开展;与相关文献中2个高强混凝土低矮剪力墙相比,HDC低矮剪力墙的变形和耗能能力明显提高;利用HDC良好的抗剪性能,可以减少水平分布钢筋的数量;HDC低矮剪力墙试件破坏时,墙体下部未产生较大面积的混凝土剥落,表明采用HDC可显著改善低矮剪力墙的脆性剪切破坏模式,提高其抗震性能和损伤容限,减小或免去强震后的修复费用。
The high strength ductile fiber reinforced concrete (HDC) is proposed to improve the seismic performance and deformability of low shear wall. Two HDC low shear wall specimens are designed and their quasi-static tests are conducted to study the failure mechanism, deformation capacity And energy consumption. The experimental results show that the HDC low shear wall has a small width of oblique shear cracks in the middle and lower part of the wall, which indicates that the tensile strain hardening and multi-fracture performance of HDC materials can effectively control the development of oblique shear cracks. Compared with the two high-strength concrete low shear walls, the deformation and energy dissipation capacity of HDC low shear walls is obviously improved. Using the good shear resistance of HDC, the number of horizontal distribution rebars can be reduced. The HDC low-shear When the force wall specimen is destroyed, there is no large area of concrete spalling in the lower part of the wall, which indicates that the HDC can significantly improve the brittle shear failure mode of the low shear wall, improve its seismic performance and damage tolerance, reduce or exempt After the strong earthquake repair costs.