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Optimal DCFP bearing properties and seismic performance assessment in nondimensional form for isolated bridges

机译：隔离桥梁的最佳DCFP轴承性能和地震性能评估

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摘要

The study analyzes the influence of double concave friction pendulum (DCFP) isolator properties on the seismic performance of isolated multispan continuous deck bridges. The behavior of these systems is analyzed by employing an eight-degree-of-freedom model accounting for the pier flexibility in addition to the rigid presence of both abutment and deck, whereas the DCFP isolator behavior is described combining two single FP devices in series. The uncertainty in the seismic input is taken into account by considering a set of nonfrequent natural records with different characteristics. The variation of the statistics of the response parameters relevant to the seismic performance of the isolated bridges is investigated through the proposal of a nondimensionalization of the motion equations, with respect to the seismic intensity, within an extensive parametric study carried out for different isolator and bridge properties. Moreover, two cases related to different ratios between the sliding friction coefficients of the two surfaces of the DCFP devices are analyzed with the aim also to evaluate the corresponding optimal values able to minimize the seismic demand to the pier. In this way, all the presented nondimensional results are useful for the preliminary design or retrofit of multispan continuous deck bridges, isolated with DCFP devices, located in any site and in relation, especially, to the seismic ultimate limit states.
机译：该研究分析了双凹摩擦摆（DCFP）隔离器性能对隔离多板连续甲板桥梁地震性能的影响。除了双支座和甲板的刚性存在之外，通过采用八维自由度模型来分析这些系统的行为，而DCFP隔离器行为除了串联组合两个单个FP设备。通过考虑具有不同特征的一组非频繁的自然记录，考虑了地震投入中的不确定性。通过对不同隔离器和桥梁进行的广泛参数研究，通过对运动方程的非潜能化的建议来研究与隔离桥的地震性能相关的响应参数的变化。特性。此外，分析了与DCFP设备的两个表面的滑动摩擦系数之间的不同比例的两种情况，目的还要评估能够将地震需求最小化对码头的相应最佳值。通过这种方式，所有呈现的非潜能结果对于多板连续甲板桥的初步设计或改造，与位于任何地点的DCFP设备隔离，特别是对地震终极极限状态。

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