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为更贴近实际工程结构的使用情况,在三维框架中对部分外包混凝土柱-型钢梁角钢连接半刚性节点的抗震性能进行研究。试验设计了一榀三维框架缩尺试件,在低周反复水平荷载及恒定的竖向荷载下,通过对梁端、连接角钢和节点域的应变、位移数据的采集及处理,分析此类节点的破坏模式、滞回性能、角钢应变、节点域应变、节点转角及初始转动刚度。试验结果表明:角钢连接半刚性节点有较强的转动能力,有接近铰接节点的转动表现;角钢连接节点的延性优越、滞回性好,表现出优异的抗震性能;受到螺栓、角钢滑移的影响,顶底角钢节点滞回曲线存在微弱的捏缩现象,但总体比较饱满。
In order to be more close to the practical engineering structure, the seismic performance of some semi-rigid joints of concrete-encased concrete column-type steel beam angle steel is studied in three-dimensional frame. In the experiment, a three-dimensional frame-scale specimen was designed to analyze such nodes by collecting and processing the strain and displacement data of beam ends, connecting angles and nodes under the condition of low cyclic repeated horizontal loads and constant vertical loads Failure modes, hysteretic behavior, angle strain, node strain, node rotation and initial rotational stiffness. The experimental results show that the semi-rigid joints with angle connections have a strong ability to rotate and have the rotation performance close to that of the hinged joints. The angle joints have superior ductility, good hysteresis and excellent anti-seismic performance. As a result, the hysteresis curve at the top and bottom corners has weak pinch and shrinkage phenomenon, but the overall angle is relatively full.