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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Evaluation of the influence of vertical irregularities on the seismic performance of a nine-storey steel frame
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Evaluation of the influence of vertical irregularities on the seismic performance of a nine-storey steel frame

机译：评估垂直不规则结构对九层钢框架抗震性能的影响

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摘要

A methodology based on incremental dynamic analysis (IDA) is presented for the evaluation of structures with vertical irregularities. Four types of storey-irregularities are considered: stiffness, strength, combined stiffness and strength, and mass irregularities. Using the well-known nine-storey LA9 steel frame as a base, the objective is to quantify the effect of irregularities, both for individual and for combinations of stories, on its response. In this context a rational methodology for comparing the seismic performance of different structural configurations is proposed by means of IDA. This entails performing non-linear time history analyses for a suite of ground motion records scaled to several intensity levels and suitably interpolating the results to calculate capacities for a number of limit-states, from elasticity to final global instability. By expressing all limit-state capacities with a common intensity measure, the reference and each modified structure can be naturally compared without needing to have the same period or yield base shear. Using the bootstrap method to construct appropriate confidence intervals, it becomes possible to isolate the effect of irregularities from the record-to-record variability. Thus, the proposed methodology enables a full-range performance evaluation using a highly accurate analysis method that pinpoints the effect of any source of irregularity for each limit-state.
机译：提出了一种基于增量动态分析（IDA）的方法来评估具有垂直不规则性的结构。考虑了四种类型的储层不规则性：刚度，强度，组合刚度和强度以及质量不规则性。以著名的9层楼高的LA9钢框架为基础，目的是量化不规则行为对故事的单个和组合的影响。在这种情况下，通过IDA提出了一种比较不同结构形态的抗震性能的合理方法。这需要对一组缩放到几个强度水平的地面运动记录执行非线性时程分析，并适当地对结果进行插值，以计算从弹性到最终全局不稳定性的多个极限状态的能力。通过用共同的强度度量表示所有极限状态容量，可以自然地比较参考结构和每个修改后的结构，而无需具有相同的周期或屈服强度。使用自举方法构建适当的置信区间，可以将不规则性的影响与记录间的差异性隔离开来。因此，所提出的方法能够使用高度精确的分析方法进行全方位性能评估，该分析方法可针对每个极限状态查明任何不规则源的影响。

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