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进行了主管内壁设置栓钉的钢管混凝土K形相贯节点(内栓钉节点)受力行为试验,同时进行了无内栓钉节点的对比试验。试验时在主管上施加压力,在两根支管上分别施加等量同步的压力和拉力。试验结果表明,该文节点的破坏为受压支管屈曲,荷载-受压支管变形曲线(N-S曲线)可分为弹性段和弹塑性段。无论有无内栓钉,主管焊接区域的应变都大于其他区域,它与荷载的关系曲线可分为弹性段和弹塑性段,而其余区域钢管均处于弹性状态。内栓钉不会改变主管钢管应变的分布规律,但是内栓钉的设置会减小主管钢管应变,表明内栓钉能将外力从钢管传递到管内混凝土,并且对应变集中的部位效果更显著。在主管轴向,应变主要集中在距离节点中心截面两侧各约2.7倍支管直径范围内;在主管环向,应变主要集中在圆心角-60°~60°区间。建议将此轴向与环向范围的应变集中区作为内栓钉的主要布设区域,区域外可以少布设或不布设。
The stress behavior test of K-shaped cross-section joints (inner bolt joints) of concrete-filled steel tubular spike in inner wall was carried out, and the comparative test of inner joint-studless joints was carried out. During the test, pressure was exerted on the supervisor, and the same pressure and tension simultaneously applied on the two branch pipes. The experimental results show that the failure of the node in this paper is the buckling of the compression manifold, and the deformation curve of the load-compression manifold (N-S curve) can be divided into the elastic section and the elastoplastic section. Regardless of the presence or absence of the inner peg, the strain in the welding area is greater than that in other areas. The curve of the load with it can be divided into the elastic section and the elastic-plastic section, while the remaining sections of the steel pipe are in elastic state. The inner pegs will not change the distribution of the main tube strain, but the inner pegs will reduce the main tube strain, indicating that the inner pegs can transfer the external force from the steel tube to the concrete in the tube and the effect of the strain concentration is more obvious. In the principal axis, the strain mainly concentrates within about 2.7 times the diameter of the branch pipe on both sides of the central cross section of the node. In the hoop direction, the strain mainly concentrates in the central angle -60 ° to 60 °. It is suggested that the axial and circumferential strain concentrating area should be regarded as the main deployment area of the inner peg. There should be little or no provision outside the area.