利用频谱兼容运动估算结构对双向地震激励的响应:一对伴生频谱的性能

IF 4.3 2区 工程技术 Q1 ENGINEERING, CIVIL Earthquake Engineering & Structural Dynamics Pub Date : 2024-04-17 DOI:10.1002/eqe.4129
Arijit Acharjya, Atanu Santra, Rana Roy
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引用次数: 0

摘要

对于常规设计而言,涵盖多个记录的一系列入射角的双向分析是必不可少的,但也是具有挑战性的。最近的研究表明,双向振动的响应可以通过最优先方向上的直接单向分析结合正交组合规则进行估算,这样也就不需要各种入射角了。此外,众所周知,使用较少的频谱兼容记录就可以估算出平均响应,从而降低离散度。结合两者的优点,最近开发出了一对独立于周期和方向的伴生光谱。虽然从合理的数学角度来看,伴生频谱的基础已经建立,但在推荐伴生频谱用于实际设计之前,可能需要重新审视所建议的频谱对实际结构的适用性,尤其是对双向相互作用敏感的结构。为了实现这一目标,在对伴生频谱进行简要审查之后,我们对理想化的 SDoF 类似结构和实际结构(如 SDoF 系统的桥墩和使用单层和多层模型的不对称建筑物(MDoF 系统))的性能进行了严格审查。结果表明,真实结构对双向地震荷载的响应可以通过使用较少的与伴音谱对兼容的记录来合理估算,同时降低离散度。因此,临界响应参数可通过实际双向分析或在较少的频谱兼容记录下结合单向分析的响应来计算。因此,可用作 "目标 "来独立匹配所选记录的两个分量的一对伴生光谱对实际设计非常有用。
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Estimating structural response to bidirectional seismic excitation using spectrum compatible motions: Performance of a pair of companion spectra

Bidirectional analyses covering a range of incidence angles for several records are essential yet challenging for routine design. Recent studies have shown that the response to bidirectional shaking may be estimated per straightforward unidirectional analysis in the most preferred orientation in conjunction with the orthogonal combination rules, and this can also remove the need for various incidence angles. Further, it is well known that the mean response can be estimated with reduced dispersion using fewer spectrum-compatible records. Combining the advantages of both, a pair of companion spectra independent of period and orientation has recently been developed. While the basis of the companion spectra is established therein from a sound mathematical perspective, the applicability of the proposed spectra to real structures may be revisited, especially to structures sensitive to bidirectional interaction, before recommending the companion spectra for practical design. To achieve this end, following a brief scrutiny of the companion spectra, the performance of the same is critically examined for idealized SDoF analogues and real structures such as bridge piers representative of SDoF systems and buildings with asymmetry using single storey and multistorey models (MDoF systems). The results show that the response of the real structures to bidirectional seismic loading can be reasonably estimated with reduced dispersion using fewer records compatible with the pair of the companion spectra. As such, the critical response parameters may be computed by actual bidirectional analyses or by combining responses to unidirectional analyses under fewer spectrum compatible records. Hence, the pair of companion spectra that can be used as “target” to independently match two components of a chosen record is useful for practical design.

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来源期刊
Earthquake Engineering & Structural Dynamics
Earthquake Engineering & Structural Dynamics 工程技术-工程:地质
CiteScore
7.20
自引率
13.30%
发文量
180
审稿时长
4.8 months
期刊介绍: Earthquake Engineering and Structural Dynamics provides a forum for the publication of papers on several aspects of engineering related to earthquakes. The problems in this field, and their solutions, are international in character and require knowledge of several traditional disciplines; the Journal will reflect this. Papers that may be relevant but do not emphasize earthquake engineering and related structural dynamics are not suitable for the Journal. Relevant topics include the following: ground motions for analysis and design geotechnical earthquake engineering probabilistic and deterministic methods of dynamic analysis experimental behaviour of structures seismic protective systems system identification risk assessment seismic code requirements methods for earthquake-resistant design and retrofit of structures.
期刊最新文献
Issue information Issue information SSI-induced seismic earth pressures on an integral abutment bridge model: Experimental measurements versus numerical simulations and code provisions Estimation of inelastic displacement ratio spectrum for existing RC structures via displacement response spectrum Linear equivalence for motion amplification devices in earthquake engineering
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