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为了避免混凝土的脆性断裂破坏,在钢/混凝土连接区域中用高延性水泥基材料(ECC)代替了普通混凝土. 采用剪力键/ECC 的抗剪试验、二维锚固螺栓/ECC 拔出试验和有限元模拟研究了 ECC 材料的延性对于连接区域破坏模式、结构性能的影响. 实验结果表明: 通过微观力学原理设计的 ECC 具有 300 倍于普通混凝土的拉伸延性,从而使钢/混凝土连接区中混凝土断裂破坏模式由脆性转变为延性. 混凝土材料的高延性使结构承载能力和变形性能获得改善,这也同时为有限元模拟结果所验证. 通过改变混凝土材料延性而提高结构性能的理念也可在其他类似的钢/混凝土组合结构中得到应用.
In order to avoid the brittle failure of concrete, normal concrete was replaced by high ductility cement-based material (ECC) in the steel / concrete joint area.The shear bond / ECC shear test, two-dimensional anchor bolt / ECC pullout test and The influence of the ductility of the ECC material on the failure mode and the structural performance of the connection region was studied by finite element simulation.The experimental results show that the ECC designed by micro-mechanics has tensile ductility of 300 times that of ordinary concrete, The failure mode of concrete is changed from brittleness to ductility. The high ductility of the concrete material improves the structural load-bearing capacity and deformation performance, which is verified by the finite element simulation results. The concept of improving the structural performance by changing the ductility of concrete material can also be found in Other similar steel / concrete composite structures are used.