In order to overcome common problems such as low stiffness, insufficient ductility and enormous residual displacements in beam–column connections, a steel beam–column connection equipped with high-strength strands was developed. These so-called post-tensioned (PT) steel connections consist of high-resistance strands passing parallel to the beam web and through drilled holes in the column flange and the top and bottom beam angles, which act as energy dissipation elements. The displacement and rotation of connections in earthquake events is a problem that can be avoided by a self-centring feature of steel PT connections. In this research, the cyclic response of PT beam–column steel connections with stiffeners connected to the top and bottom beam angles was investigated. Different stiffener geometries and thicknesses were examined and numerical models were simulated using Abaqus software. The results showed that installation of stiffeners on the top and bottom beam angles had a direct effect on the gap opening of the beam–column interface and reduced the relative rotation. Under large applied drifts, primary elements of the connection experienced large deformation and failure. Thus, by equipping angles with stiffeners, all of the induced stresses and damage will be concentrated in the stiffeners. In all the models equipped with stiffeners, the behaviour of beam reached the plastic phase and the minimum value of M_max/M_pn was almost 1·1. Failure of the angles was also delayed and the primary elements of the connection (beam and column) remained undamaged.

中文翻译：

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后张自定心梁-柱连接的弯矩-旋转响应

为了克服常见的问题，例如刚度低，延展性不足和梁柱连接中的巨大残余位移，开发了配备高强度钢绞线的钢梁柱连接。这些所谓的后张预紧（PT）钢连接由高强度钢绞线组成，这些钢绞线平行于梁腹板并穿过柱法兰上的钻孔以及顶部和底部梁角，这些梁作为能量消散元件。钢PT连接的自定心功能可以避免地震中连接的位移和旋转。在这项研究中，研究了带有连接到顶部和底部梁角的加劲肋的PT梁-柱钢连接的循环响应。检查了不同的加劲肋几何形状和厚度，并使用Abaqus软件模拟了数值模型。结果表明，在顶部和底部梁角上安装加劲肋对梁-柱界面的间隙开口有直接影响，并减少了相对旋转。在较大的应用漂移下，连接的主要元素会经历较大的变形和破坏。因此，通过在角钢上设置加劲肋，所有引起的应力和损伤都将集中在加劲肋中。在所有配备加劲肋的模型中，梁的行为达到了塑性阶段，并且梁的最小值达到 结果表明，在顶部和底部梁角上安装加劲肋对梁-柱界面的缝隙开口有直接影响，并减少了相对旋转。在较大的应用漂移下，连接的主要元素会经历较大的变形和破坏。因此，通过在角钢上设置加劲肋，所有引起的应力和损伤都将集中在加劲肋中。在所有配备加劲肋的模型中，梁的行为达到了塑性阶段，并且梁的最小值达到 结果表明，在顶部和底部梁角上安装加劲肋对梁-柱界面的缝隙开口有直接影响，并减少了相对旋转。在较大的应用漂移下，连接的主要元素会经历较大的变形和破坏。因此，通过在角钢上设置加劲肋，所有引起的应力和损伤都将集中在加劲肋中。在所有配备加劲肋的模型中，梁的行为达到了塑性阶段，并且梁的最小值达到M _max / M _pn几乎为1·1。角度的破坏也被延迟，并且连接的主要元素（梁和柱）保持完好无损。