角钢加固钢筋混土增层植筋柱节点试验研究

Experimental Study of Planting Bar Add Layer Reinforced Concrete Column Nodes Strengthened by Angle Steel Bar

试验设计制作了4个混凝土"士"字型节点缩尺模型构件,其中一个采用整体浇筑形式,对比柱采用植筋接长,加固柱I仅采用外包角钢加固,加固柱II在加固I的基础上在缀板上加螺栓。低周反复荷载试验表明:采用植筋接柱的框架节点承载能力低,破坏形态属于脆性破坏,抗震能力极差,加固柱I破坏形态由脆性破坏转换为延性破坏,但与整浇柱相比,未能达到预期的加固效果。加固柱II极限承载力比完整柱提高了11.7%,角钢在破坏时已屈服,耗能能力提高了40.7%,达到预期的加固效果。

Four concrete scale models of the node are designed,the form of them like ＂士 ＂,one of them is made by the overall placement form,others are taken for long by planting bar,reinforced column I is only reinforced by outsourcing angle steel,reinforcement column II is reinforced by the form like reinforced column I and screwed nut in the decorated. Low cyclic loading tests show that： the frame column node of the planting bar has low arrying capacity; failure mode is brittle fracture,poor seismic capacity,reinforced column I becomes ductile brittle failure because of the angle steel bar,but compared with the overall placement form,it fails to achieve the desired reinforcement effect; ultimate bearing capacity of reinforced column II increases 11. 7% than a full column,the angle steel has yielded when it damaged,energy dissipation capacity increases 40. 7%,and the desired reinforcement effect is achieved.