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以国内首例采用钢管混凝土的750 kV超高压变电构架工程为背景,设计了3个1∶2缩尺、主管灌注混凝土的Y型相贯节点试件,其中包括2个采用不同加强方式(即瓦形板、外套筒加强)和1个作为对比的无加强节点试件,并对其进行了平面内受弯性能试验。试验结果表明:相比无加强节点,采用的2种加强节点的最终破坏形态均为支管失效破坏,均符合“强柱弱梁”的设计原则;节点的转动刚度和受弯承载力均显著提高,平面内转动刚度均可达到欧洲规范规定的刚性节点要求,且平面内受弯承载力基本可以达到支管全截面塑性时的弯矩值。此外,对节点的有限元分析表明:主管轴压比、瓦形板长度和宽度对节点刚度和承载力影响较小,而瓦形板厚度对此影响较为显著。
Taking the first 750 kV UHV substation project with CFST in China as the background, three Y-shaped cross-section joints of 1: 2 scale and in charge of perfusion concrete were designed, including two test cases with different reinforcement methods Namely the tile-shaped plate, the outer sleeve to strengthen) and a non-strengthening node as a comparison of the specimen, and its in-plane bending performance test. The experimental results show that the ultimate failure modes of the two kinds of reinforced joints are failure failure of the pipe compared with the non-reinforced joints, which are all in line with the design principle of “strong-column weak beams”. Both the rotational stiffness and the flexural capacity of the joints And the rotational stiffness in plane can all meet the requirements of the rigid joints regulated by the European Code, and the flexural capacity in plane can basically reach the bending moment value of plasticity in the full cross-section of the branch pipe. In addition, the finite element analysis of the joints shows that the axial compression ratio and the length and width of the slab have little effect on the joint stiffness and bearing capacity, while the thickness of the slab has a significant impact on this.