一种用于锅炉钢结构的新型钢缆‑阻尼限位器减震性能振动台试验研究

Study of the Seismic Performance of a Novel Cable-damper Stopper Designed for Boiler Steel Structures Based on Shaking Table Tests

摘要:

为克服现有锅炉-钢结构限位器的缺点，特提出了一种新型钢缆-阻尼限位器，此限位器具有非线性刚度，且可以通过阻尼器进行耗能，从而提升支撑结构的抗震性能。为了研究该限位器阻尼系数与安装位置对目标结构地震响应的影响，设计了缩尺锅炉钢结构模型并进行了振动台试验。原模型为某锅炉厂的锅炉-钢结构，采用了1∶25的缩尺比例并对原型结构进行了必要的简化，以便测试钢缆-阻尼限位器的抗震效果。为了探究限位器阻尼系数以及安装方案对结构抗震性能的影响，选取峰值加速度为1.0g的Kobe波作为地震动输入，对装配了不同参数限位器的模型和在不同位置装配了限位器的模型进行了试验；作为对比，选取峰值加速度为0.2g的Kobe波作为地震动输入，对未装配限位器的模型进行了试验。在对它们的结构动力特性和结构响应进行了对比研究后，发现：（1）该限位器对减震有积极作用；（2）阻尼系数对结构地震响应影响显著，并且存在一个最优阻尼参数值使得限位器兼具性能优势与经济性；（3）布置于底层的限位器的减震效果更优。

Abstract:

To address the limitations of existing stoppers designed for boiler-steel structures, this paper proposes a novel cable-damping stopper. This stopper features nonlinear stiffness and dissipates energy through a damper, thereby enhancing the seismic performance of the supporting structure. To investigate the effects of the damping coefficient and installation position of the stopper on the seismic response of the target structure, a scaled-down boiler steel structure model was designed and subjected to shaking table tests. The prototype model was based on a boiler-steel structure from a boiler plant, scaled down to 1∶25, with necessary simplifications to facilitate the evaluation of the seismic effectiveness of the cable-damper stopper. To explore the influence of the damping coefficient and installation scheme on structural seismic performance, experiments were conducted using the Kobe wave with a peak ground acceleration of 1.0g, on models equipped with stoppers of different parameters and at various positions. In contrast, for the scaled model without the stoppers, a peak ground acceleration of 0.2g was selected. A comparative study of structural dynamic characteristics and seismic responses revealed that: (1) the stopper significantly improved the seismic resistance of the scaled model. (2) The damping coefficient had a substantial impact on the seismic response, with an optimal damping coefficient that provided both effectiveness and economic efficiency. (3) Stoppers installed at lower levels demonstrated superior seismic resistance effects.