钢管混凝土桁肋内栓钉相贯节点受力行为试验研究

发布时间：2019-03-01 16:44

【摘要】：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。
[Abstract]:The behavior of concrete-filled steel tube (CFST) K-shaped joints (internal stud joints) with stud in the inner wall of the main pipe was tested, and the contrast tests of the joints without internal stud were carried out at the same time. In the test, the pressure was applied on the main pipe and the same amount of synchronous pressure and tension were applied on the two branches. The experimental results show that the failure of this joint is buckling of compressed branch, and the deformation curve of load-compression branch can be divided into elastic section and elastic-plastic section. With or without internal stud, the strain in welded area of the main pipe is larger than that in other regions. The curves of its relationship with load can be divided into elastic segment and elasto-plastic section, while the rest of the steel pipe is in elastic state. The internal bolt will not change the distribution of the strain of the main pipe, but the setting of the pin will reduce the strain of the pipe, which indicates that the inner bolt can transfer the external force from the steel tube to the concrete in the pipe, and the effect on the position of the strain concentration is more obvious. In the main axis, the strain is mainly in the range of about 2.7 times the diameter of the branch pipe on both sides of the central section of the joint, and in the circumferential direction of the main pipe, the strain is mainly concentrated in the range of-60 掳- 60 掳to 60 掳of the center angle. It is suggested that the strain concentration area in the axial and circumferential direction should be regarded as the main layout area of the internal stud, and that there can be less or no arrangement outside the area.
【作者单位】：福州大学土木工程学院;福建省交通建设工程试验检测有限公司;
【基金】：国家自然科学基金项目(51178118)
【分类号】：U446.1

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