钢结构可替换梁端塑性铰滞回耗能研究

为避免钢结构梁柱节点在地震作用下出现脆性破坏,提出一种新的梁端削弱型结构形式来实现塑性铰的外移。采用ABAQUS有限元分析软件对节点进行滞回耗能能力的分析,同时对不同削弱深度的截面内力进行对比分析,并使用Perform-3D软件的静力推覆工况对新型塑性铰框架和普通框架的承载能力进行对比分析。研究结果表明,首先达到屈服强度的截面是上、下耗能板削弱最深位置的横截面;随着耗能板削弱深度的增加,耗能板削弱最深处横截面就会越容易屈服,且能够有效地降低梁柱节点焊缝截面的作用反力;新型塑性铰的耗能能力主要与耗能板的削弱深度有关,在满足承载力要求的情况下随着削弱深度的增加,塑性铰的耗能能力不断增加;由静力推覆分析可知,拥有新型塑性铰框架的整体承载能力比普通框架的整体承载能力低,所以过度的削弱耗能板深度会导致框架不能满足结构承载力的要求。适当的削弱深度会增加节点延性,提高节点的抗震能力,实现塑性铰外移的目标,起到保护梁柱节点的作用。研究结果可为削弱型梁柱节点的研究提供参考。

Study on the hysteretic energy of the plastic hinge of thereplaceable beam end of steel structure

In order to avoid brittle failure of steel structure beam-column joints under earthquake action, a new beam-end weakening structure was proposed to realize the external displacement of plastic hinges. In this paper, finite element analysis software ABAQUS was used to analyze the hysteretic energy dissipation capacity of the joints, and comparative analysis was made on the internal forces of sections with different weakening depths. In addition, Perform-3D software was used to Perform a comparative analysis on the bearing capacity of the new plastic hinge frame and the common frame under the static overthrust condition. The results showed that the cross section that first reaches the yield strength was the cross section where the upper and lower energy dissipation plates weaken the deepest position; as the depth of the energy dissipation plate increases, the energy dissipation plate weakens the deepest cross section and the easier it was to yield, and Effectively reduce the reaction force of the welded section of the beam-column joint; the energy consumption of the new plastic hinge is mainly related to the weakening depth of the energy-consuming board, and the plastic hinge consumption increases with the increase of the weakening depth when the bearing capacity requirement was met. The ability to continuously increase; from the static push analysis, the overall load carrying capacity of the new plastic hinge frame was lower than the overall load capacity of the ordinary frame, so excessively weakening the depth of the energy plate will cause the frame to fail to meet the structural bearing capacity requirements. Appropriate weakening of the depth will increase the ductility of the joint, improve the seismic capacity of the joint, achieve the goal of plastic hinge shifting, and protect the beam-column joints. The research content of this paper can provide reference for the study of weakened beam-column joints.