防落梁油阻尼器参数优化设计及工程应用研究

发布时间：2019-01-05 21:55

【摘要】：在强烈地震作用下,简支、连续等桥型上部结构移位和落梁是主要震害形式。如果能够通过机械限位和增大阻尼减少梁体移位,既能阻止梁体与挡块的碰撞,又能防止落梁,则桥梁震害会显著降低。为此,我们开发了一种具有机械限位和阻尼双重功能的新型油阻尼器。作者查阅了近年来油阻尼器的相关文献,了解了该领域的研究进展及工程应用情况。在“油流经小口消耗能量”的原理指导下,设计了两种型号(FZ1和FZ2)油阻尼器。通过阻尼器参数测试专用装置,探讨了通油孔方式及通油小孔面积对油阻尼器力-速度关系的影响。论文主要成果如下。1.总结、梳理了国内外关于油阻尼器研究、应用的文献,对油阻尼器的工作原理、设计方法及制造工艺有了深刻理解;2.设计了两种油阻尼器,第一种为旁路小孔通油型(FZ1),通过手动调节节流截止阀改变通油小孔的净截面,探索小孔截面对油阻尼器力-速度关系的影响;第二种为活塞开孔型(FZ2),通过不同截面、不同数量活塞小孔的组合,探讨通油小孔净截面对油阻尼器力-速度关系的影响;3.分别利用国产作动器和美国MTS作动器,在卧式阻尼器专用测试装置上,在各个可能工况下对上述两种油阻尼器进行了伪静力试验,得到了每一工况的力-速度关系曲线。对试验结果整理,探讨了阻尼器通油小孔的最优组合,为优化设计指明了思路;4.利用实测的油阻尼器参数,探讨了实际桥梁应用油阻尼器后的地震响应。结果显示,合理设置油阻尼器,可显著提高简支或连续梁桥的抗震能力。
[Abstract]:Under the action of strong earthquake, the displacement and falling beam of simply supported and continuous bridge superstructures are the main damage forms. If the displacement of beam can be reduced by mechanical limiting and increasing damping, both the collision between the beam and the block can be prevented, and the beam fall can be prevented, the damage of the bridge will be significantly reduced. Therefore, a new oil damper with mechanical limit and damping is developed. The authors have reviewed the relevant literatures of oil dampers in recent years, and have understood the research progress and engineering applications in this field. Under the guidance of the principle of "energy consumption through the small mouth", two types of oil dampers (FZ1 and FZ2) are designed. By means of a special device for damper parameter testing, the influence of the through oil hole mode and the area of the through oil hole on the relationship between the force and velocity of the oil damper is discussed. The main achievements are as follows. 1. Summarized and combed the domestic and foreign literature about the research and application of oil damper, deeply understood the working principle, design method and manufacturing technology of oil damper; 2. Two kinds of oil dampers are designed. The first type is a bypass through oil type (FZ1). By manually adjusting the throttle valve to change the net cross section of the oil orifice, the influence of the pore section on the relationship between the force and velocity of the oil damper is explored. The second is piston perforation (FZ2). Through the combination of different cross sections and different number of piston holes, the influence of the net cross section of the oil hole on the relationship between the force and velocity of the oil damper is discussed. 3. Using domestic actuators and American MTS actuators, pseudo-static tests of the two kinds of oil dampers were carried out under various possible working conditions on a special testing device for horizontal dampers, and the force-velocity relationship curves of each condition were obtained. According to the experimental results, the optimal combination of the dampers through the oil holes is discussed, and the train of thought for the optimal design is pointed out. 4. Based on the measured parameters of oil dampers, the seismic responses of bridges with oil dampers are discussed. The results show that the seismic capacity of simply supported or continuous beam bridges can be significantly improved by setting oil dampers.
【学位授予单位】：防灾科技学院
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU352.1

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