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首页> 外文期刊>Construction and Building Materials >Behavior of high-strength fibrous concrete slab-column connections under gravity and lateral loads
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Behavior of high-strength fibrous concrete slab-column connections under gravity and lateral loads

机译：高强度纤维混凝土板-柱连接在重力和侧向荷载作用下的行为

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Ten slab-column connections were tested under combinations of gravity and lateral loads to investigate the effect of adding steel fibers to concrete mix on the structural behavior of normal- and high-strength slab-column connections. The variables selected for this study were the strength of concrete, volumetric ratio of steel fibers, type of steel fibers, and moment to shear ratio. The test specimens consisted of two identical series. The first series constructed with normal-strength concrete with a cube compressive strength of about 28 MPa, and designated as NSC. The second series constructed with high-strength concrete with cube compressive strength of about 75 MPa were designated as HSC. Each series consisted of three specimens with steel fibers and were tested under gravity load and unbalanced moment, and two control specimens; one was tested under gravity load only, while the other was tested under pure moment. The addition of steel fibers does significantly enhance the performance of the tested slab; it improves the shear strength, increases the ductility due to deflection and rotation, yields greater stiffness, and smaller cracks widths. Further improvement was also obtained when larger aspect ratio was used. Test results showed that the high-strength concrete specimens had larger shear strength, displacement and rotation ductility ratios, and corresponding energy absorption, than the normal-strength specimens by about 7-21%, 11-64%, 106-123%, 48-150%, and 93-246%, respectively. Incorporating steel fibers with high-strength concrete improved the overall deformation characteristics of the tested specimens and resulted in less sudden and more gradual failure mode.
机译：在重力和侧向载荷的组合下测试了十个平板-柱连接，以研究在混凝土混合物中添加钢纤维对普通和高强度平板-柱连接的结构性能的影响。这项研究选择的变量是混凝土的强度，钢纤维的体积比，钢纤维的类型以及弯矩与剪切比。测试样本由两个相同的系列组成。第一个系列由具有约28 MPa立方体抗压强度的普通强度混凝土构造而成，并命名为NSC。由具有约75 MPa立方体抗压强度的高强度混凝土构造的第二系列称为HSC。每个系列包括三个带有钢纤维的试样，并在重力载荷和不平衡力矩下进行了测试，以及两个对照试样。一个仅在重力载荷下进行测试，而另一个则在纯力矩下进行测试。钢纤维的添加确实可以显着提高被测板的性能。它提高了剪切强度，由于挠曲和旋转而增加了延展性，产生了更大的刚度，并减小了裂缝宽度。当使用更大的纵横比时，也获得了进一步的改进。试验结果表明，高强度混凝土试件的抗剪强度，位移和旋转延性比及相应的能量吸收比普通强度试件大约7-21％，11-64％，106-123％，48 -150％和93-246％。钢纤维与高强度混凝土的结合改善了试样的整体变形特性，并减少了突发性和逐渐的破坏模式。

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