铝合金网壳箱形-工字形杆件盘式节点受力性能试验研究

发布时间：2018-09-06 18:09

【摘要】：为研究铝合金网壳箱形、工字形截面杆件盘式连接节点(又称TEMCOR节点、板式节点)的受力性能,对南京牛首山佛顶宫工程典型铝合金盘式节点足尺试件进行了静力加载试验,采用通用有限元程序ABAQUS对加载过程进行全过程数值模拟。在进行静力加载试验时,铝合金杆件端部采用铰接,在节点盘中心区域设置加载板进行竖向加载。研究结果表明:在节点盘中心竖向荷载作用下试件发生脆性破坏。对向两杆为箱形截面(试件JD1)时,箱形截面杆件下翼缘发生断裂,上下节点盘屈曲,且与断面相邻的螺栓被拉断;对向杆件为工字形截面(试件JD2)时,下节点盘发生块状撕裂,破坏时铝合金型材及螺栓均无屈曲和破坏。在极限荷载作用下,试件JD1杆件腹板及节点盘仍处于弹性工作状态,箱形截面中性轴位于截面中间;试件JD2铝合金型材处于弹性工作状态,工字形截面中性轴位于截面强轴以下1/6腹板高度处,下节点盘在α=60°及α=180°方向应力较大,接近屈服强度。试件JD1的极限荷载和初始刚度均约为试件JD2的1.5倍。根据对称性建立的节点试件数值模型分析所得的局部应力、荷载-位移曲线及弯矩-转角曲线与试验结果吻合较好,可以用于此类节点的数值模拟。
[Abstract]:In order to study the mechanical behavior of aluminum alloy reticulated shell box, I-shaped cross section rod disc connection joint (also called TEMCOR joint, plate joint), static loading test was carried out on typical aluminum alloy plate type joint of Nanjing Niu Shoushan Foding Palace Project. The general finite element program ABAQUS is used to simulate the whole loading process. In the static loading test, the end part of the aluminum alloy bar is hinged, and the loading plate is arranged in the center of the node disk for vertical loading. The results show that brittle failure occurs in the specimens under vertical load at the center of the nodal disk. When the two rods are box-shaped (JD1), the lower flange of the box-shaped rod is broken, the upper and lower node disk buckles, and the bolt adjacent to the section is broken. The aluminum alloy profile and bolt have no buckling and failure. Under the action of ultimate load, the web plate and the node plate of the JD1 bar of the specimen are still in elastic working state, the neutral axis of the box section is in the middle of the section, and the JD2 aluminum alloy profile of the specimen is in the elastic working state. The neutral axis of I-shaped section is located at the height of 1 / 6 web below the strong axis of section, and the stress of the lower node disc is large in the direction of 伪 ~ (60 掳) and 伪 ~ (180) 掳, which is close to the yield strength. The ultimate load and initial stiffness of JD1 are about 1.5 times of that of JD2. The local stress, load-displacement curve and moment-rotation curve obtained from the numerical model of nodal specimens based on symmetry are in good agreement with the experimental results, and can be used in the numerical simulation of this kind of joints.
【作者单位】：清华大学土木工程安全与耐久教育部重点实验室;华东建筑设计研究院有限公司;上海通正铝业工程技术有限公司;
【基金】：国家自然科学基金重点项目(51038006)
【分类号】：TU395

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