小箱梁桥减震钢阻尼器低周疲劳性能分析
Analysis of Low-Cycle Fatigue Performance of Steel Dampers for Small Box Girder Bridges
本文以采用板式橡胶支座和三角形板钢阻尼器组合减震体系的上海市典型小箱梁桥为背景,对钢阻尼器低周疲劳性能进行了分析。研究建立了典型小箱梁桥OpenSees有限元模型,进行地震反应时程分析,分别采用能量法和线性累积损伤法对钢阻尼器的低周疲劳寿命进行了评估,分析了地震动有效持续时间对钢阻尼器的疲劳寿命的影响,并对两种方法的计算过程及结果进行了比较。研究结果表明,两种方法计算的钢阻尼器等效滞回圈数均小于规范规定的20圈,其中,能量法因其保守性和简洁性,更适用于工程设计中的钢阻尼器疲劳性能评估。
This paper analyzes the low-cycle fatigue performance of steel dampers in a typical small box girder bridge in Shanghai, which employs a combined damping system composed of laminated rubber bearings and triangular steel plate dampers. An OpenSees finite element model of the bridge was established to conduct seismic response time-history analysis. The fatigue life of the steel dampers was evaluated using both the energy method and the linear cumulative damage method. The influence of the effective duration of seismic ground motions on the fatigue life was investigated, and a comparative analysis of the calculation procedures and results of the two methods was conducted. The results indicate that the equivalent number of hysteresis loops calculated by both methods is less than the 20-cycle threshold specified in the design code. Between the two, the energy method, owing to its conservatism and simplicity, is considered more suitable for the engineering evaluation of steel damper fatigue performance.
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国家自然科学基金资助项目(52178155)
上海住建委课题(沪建科2024-002-028)
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