钢管混凝土边框钢纤维混凝土剪力墙受剪承载力计算

通过5个钢管混凝土边框钢纤维混凝土剪力墙和1个钢管混凝土边框混凝土剪力墙的低周反复加载试验，研究钢管混凝土边框钢纤维混凝土剪力墙的受力机理及破坏模式，分析钢纤维体积率和混凝土强度对其抗震性能的影响。结果表明：钢管混凝土边框钢纤维混凝土剪力墙的破坏模式为剪切破坏；墙体裂缝主要为典型的斜裂缝，钢纤维可有效限制剪力墙裂缝宽度，改善裂缝形态；随着钢纤维体积率的增大，剪力墙受剪承载力、延性和耗能能力明显提高；其他影响因素相同的条件下，钢纤维体积率为0.5%、1.0%和1.5%的剪力墙受剪承载力较未掺钢纤维剪力墙的分别提高了4.4%、12.7%和18.6%；随着混凝土强度的提高，剪力墙受剪承载力和耗能能力明显提高，但延性降低；其他影响因素相同的条件下，钢纤维混凝土强度等级为CF60、CF80剪力墙的受剪承载力较CF40剪力墙的分别提高了24%和37%。结合对文中及国内外相关文献试验数据的综合分析，提出了考虑钢纤维体积率和混凝土强度等影响的钢管混凝土边框钢纤维混凝土剪力墙受剪承载力计算方法，与试验结果吻合较好。

Calculation method for shear capacity of steel fiber reinforced concrete shear wall with concrete filled steel tubular columns

Through cyclic testing on five steel fiber reinforced concrete shear walls with concrete filled steel tubular columns and one reinforced concrete shear wall with concrete filled steel tubular columns under reversed cyclic loading, the mechanical characteristic and failure mode of the considered shear walls were analyzed. The influential factors, such as steel fiber volume fraction and concrete strength on the seismic behavior of the shear walls were studied. The results show that the fundamental failure mode of steel fiber reinforced concrete shear walls with concrete filled steel tubular columns is shear failure. All the specimens mainly exhibit a typical diagonal cracking pattern during the testing process, and the steel fiber can effectively control the crack width and improve the distribution shape of the cracks. The shear capacity, ductility and energy dissipation capacity are obviously improved with increase in the steel fiber volume fraction. Compared with the shear wall without steel fiber, the shear capacities of the walls with steel fiber volume fractions of 0.5%, 1.0% and 1.5% increase by 4.4%, 12.7% and 18.6% , respectively. The shear capacity and energy dissipation capacity of the shear walls increase obviously with increased concrete strength, whereas the ductility is reduced with increase in concrete strength. Compared with the shear wall with concrete strength of CF40, the shear capacities of the shear walls with concrete strengths of CF60 and CF80 increase by 24% and 37%, respectively. Finally, a calculation method for shear capacity of steel fiber reinforced concrete shear walls with concrete filled steel tubular columns was developed based on the comprehensive analysis of experimental data in this paper and the related research both at home and abroad, which considered the influences of steel fiber volume fraction and concrete strength. And the calculation results are in good agreement with the test results.