新型三维减振(震)装置力学性能试验与控制效果分析

MECHANICAL PERFORMANCE TESTING AND CONTROL EFFECT OF A NEW THREE-DIMENSIONAL VIBRATION REDUCTION BEARING

  • 摘要: 聚焦当前振(震)双控技术方案解决的难点和热点问题,提出了一种新型圆柱螺旋弹簧-叠层铅芯橡胶三维减振(震)控制装置,进行了竖向刚度、极限承载力以及水平频率相关性、极限压剪等力学性能试验,推导了水平和竖向力学性能理论计算模型,验证了理论模型的合理性,结合有限元探究了采用该装置设计的建筑结构在地铁、地震作用下的控制效果。结果表明,所提装置可实现水平和竖向双向解耦控制设计,具有良好的水平和竖向性能,滞回耗能饱满、稳定,频率相关性和加载次数相关性小,水平方向等效阻尼比和极限压剪位移分别达到8%、48.75 mm;所提理论模型能反映装置的双向力学行为,水平15 mm压剪试验下各参数的误差均值仅为3.96%;所提三维减振(震)装置可大大改变原结构的动力特性,衰减结构双向动力响应,竖向地铁、水平设防地震作用下结构竖向加速度和水平楼层剪力降幅分别达94%、55%。

     

    Abstract: The difficulties and hot issues in solving the dual control technology solutions are focused on current rail transit services. A new type of three-dimensional vibration reduction bearing is thusly proposed, which is composed by a cylindrical spiral spring and a laminated lead rubber. Research on its mechanical properties, such as vertical stiffness, ultimate bearing capacity, horizontal frequency correlation, and ultimate compression shear capacity, is conducted by testing. Theoretical calculation models for its horizontal and vertical mechanical properties are derived, which is verified by the comparison with the experimental data. Based on finite element analysis, the control effect of the building structure designed with this bearing is explored in actions of subway and seismic waves. Results show that: the bearing proposed can achieve bidirectional decoupling control design, and has good horizontal and vertical mechanical performance. The hysteresis energy consumption is full and stable, with little correlation between frequency and loading times. The equivalent damping ratio and ultimate compression shear displacement in the horizontal direction reach 8% and 48.75 mm, respectively. The theoretical model can reflect the bidirectional mechanical behavior, and the average error with the experimental data is only 3.96% in horizontal 15 mm compression shear testing. The bearing proposed can change the dynamic characteristics and attenuate the bidirectional dynamic response. The vertical acceleration and horizontal floor shearing force of the structure decrease by 94% and 55%, respectively, in vertical subway and horizontal seismic actions.

     

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