超低周疲劳试验中板式橡胶支座的整体水平刚度退化
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TU391

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强震下螺栓球网格结构超低周疲劳性能与评定方法研究


Study on Horizontal Stiffness Degradation of Complete Plate Rubber Bearing in Ultra Low Cycle Fatigue Test
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Study on ultra low-cycle fatigue behaviors and their evaluation method of standardized bolted jointing grid structures under strong earthquake

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    摘要:

    当遭遇超越本地区抗震设防烈度的灾难性地震时,大跨度空间网格结构的板式橡胶支座会产生超过正常设计范围的水平位移,从而发生超低周疲劳破坏为研究灾难地震下,产生大位移的板式橡胶支座在超低周疲劳试验中的破坏过程与水平刚度退化规律,设计了可双向加载的试验装置。不同竖向力下,让采用不同直径锚栓的板式橡胶支座进行水平往复运动,得到并分析了支座的滞回曲线,骨架曲线和水平刚度退化曲线。试验结果表明,水平往复加载作用下,当板式橡胶支座的水平位移超过正常的设计范围时:①原本按构造要求设计的锚栓参与受力,锚栓最先发生了疲劳断裂,成为支座的薄弱环节;②支座的整体水平刚度大体上呈现先上升后下降的变化趋势;③增大锚栓的直径可提高支座的整体水平刚度与水平承载力,且竖向力的变化也会对支座的整体水平刚度和水平承载力产生一定程度的影响。

    Abstract:

    When encountering a catastrophic earthquake that exceeds the seismic fortification intensity of the region, the plate rubber bearing of the large-span space grid structure will produce a horizontal displacement exceeding the normal design range, resulting in ultra-low cycle fatigue damage. When encountering a disaster earthquake, in order to study the failure process and horizontal stiffness degradation of plate rubber bearings with large displacement in ultra-low cycle fatigue test, a test device capable of bidirectional loading was designed. Under different vertical forces, the complete plate rubber bearing with different diameter anchors was used to horizontally reciprocate, and the hysteresis curve, skeleton curve and horizontal stiffness degradation curve of the bearing were obtained and analyzed. The test results show that under the horizontal reciprocating loading, when the horizontal displacement of the plate rubber bearing exceeds the normal design range: ①The anchor bolt originally designed according to the structural requirements is involved in the stress, and the anchor bolt first suffered from fatigue fracture and became the weak link of the bearing; ②The horizontal stiffness of the bearing generally shows a process of increasing first and then decreasing; ③Increasing the diameter of the anchor can increase the horizontal stiffness and horizontal bearing capacity of the bearing, and the change in vertical force also has a certain degree of influence on the horizontal stiffness and horizontal bearing capacity of the bearing.

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张恩超,李海旺,宋夏芸,等. 超低周疲劳试验中板式橡胶支座的整体水平刚度退化[J]. 科学技术与工程, 2020, 20(19): 7826-7831.
Zhang Enchao, Li Haiwang, Song Xiayun, et al. Study on Horizontal Stiffness Degradation of Complete Plate Rubber Bearing in Ultra Low Cycle Fatigue Test[J]. Science Technology and Engineering,2020,20(19):7826-7831.

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历史
  • 收稿日期:2019-08-21
  • 最后修改日期:2019-11-18
  • 录用日期:2020-01-07
  • 在线发布日期: 2020-07-28
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