摘要:
对广州新电视塔钢结构双向铰节点进行了两个典型节点足尺试验研究和有限元分析。该节点为楼面梁与外筒柱的连接节点,由向心关节轴承、嵌固板、耳板和销轴构成。根据试验目的,试验分两阶段进行,第一阶段试验完成后,结合试验和有限元分析结果,对节点构造提出改进意见,重新设计节点,对改进后的节点进行第二阶段试验。介绍了节点的试验方法,描述了整个加载过程中节点行为和破坏模式。试验结果表明,节点的极限承载力都超过设计荷载2.5倍以上,且两阶段试验破坏工况加载力均超过轴承额定静载荷,但轴承均未破坏。试验结果和有限元分析结果证明,节点区的耳板A与突缘连接区域加厚等加强措施是有效的。
Abstract:
Two specimens at full scale of bidirectional pin??hinged joint in the Guangzhou new TV tower were tested using FEM analysis. The joint was the connection between a floor beam with an outer tube column, which was composed of radial spherical plain bearing, embeded slab, ear plate and pin. Based on the goal of the test, the test was carried out in two stages. After completion of test stage 1, some improving ideas were advanced for structural details of joints, and then the improved joints were tested in test stage 2. The experimental method, behavior within the whole loading period and failure mode of the joint were described. The test results indicated that the ultimate capacity of the joints was over 2.5 times of the designed load.The loading force on the failure condition has exceeded the rated dead load of bearing in two test stages. No failure behavior of the bearing was observed in the test. Both the test results and the FEM analysis results proved that the reinforcement of the joint with ear plate A and thickening flange of the connecting region of flange were quite effective.
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