Results 11 to 20 of about 7,311,002 (240)
An earthquake response spectrum method for linear light secondary substructures [PDF]
, 2007 YesEarthquake response spectrum is the most popular tool in the seismic analysis and design of structures. In the case of combined primary-secondary (P-S) systems, the response of the supporting P substructure is generally evaluated without considering ...
Palmeri, Alessandro, Muscolino, G.
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Effects and mechanisms of ground vibration randomness on peak surface acceleration
Yantu gongcheng xuebao, 2023 The randomness of artificial seismic vibration has important influences on the peak value of ground acceleration. Based on the results of soil layer shear wave velocity and soil body nonlinear statistics, three soil layer seismic response models are ...
QI Wenhao 1, 2, CHEN Fangxiao 1, 2, LI Linfang 1, 2, ZHANG Xiankai 1, 2
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Dizhen xuebao, 2022 针对现有地震波散射问题的解析解均在频域内给出，其适用的频带较窄，不能获取到可靠的瞬态反应解析解的问题，本文利用宽频带频域解析解进一步获取了不同空间点地震反应的宽频带频响函数，并基于傅里叶变换得出SH波入射下圆弧形凹陷地形瞬态动力响应的解析解。以上述为基础，研究了输入脉冲与实际地震动时凹陷的瞬态反应的基本特征，并重点分析了凹陷对地震动的放大效应，该效应定义为凹陷周围不同空间点的地震反应参数，如其峰值和反应谱等与自由场（即弹性半空间）地震反应参数之间的比值。结果表明：输入脉冲时，凹陷角点位移幅值显著放大 ...
Caihong Yang, Minghui Hao, Yushan Zhang
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Dizhen xuebao, 2021 采用数值方法合成地震动时，除对反应谱拟合外，对峰值位移的拟合和天然地震动非平稳特性的模拟也具有重要的意义和工程应用前景。本文基于小波函数的拟合方法，提出了一种能够同时合成目标反应谱和峰值位移的地震动加速度时程。数值算例表明：该方法具有较快的收敛速度，可用较少的迭代运算实现对目标反应谱和目标峰值位移的较高精度拟合；相较于现有的其它拟合方法，由于所构造的小波函数具有时域局部特点，该方法合成的地震动能够较好地保留天然地震动的非平稳特性。
Shan Wang +3 more
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Selector for the Spectrum Award 2018
, 2018 Billingham was invited to be part of the selection panel for the first Spectrum Award in 2018 alongside Mark Wallinger, Charming Baker, Professor Simon Baron-Cohen, Sacha Craddock and Mary Simpson.
Billingham, Richard, Spectrum
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Improvement in seismic performance of building with BRBs [PDF]
Журнал інженерних наук, 2021 Buckling restrained braces (BRBs) are a somewhat ongoing improvement in the field of seismic-safe steel structures. Their unmistakable component is the non-clasping conduct regularly accomplished by encasing a steel center in a substantially filled ...
Pawar R. S., Patil, J.
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Editorial Note: Impact of COVID-19 on Spectrum operations
, 2020 To support our authors, reviewers and editors during the COVID-19 pandemic, the Spectrum Editorial Board has relaxed its timelines for the publication of this most recent issue (Issue 5). We are working with our authors on their Issue 5 submissions,
Editorial Board, Spectrum
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Dizhen xuebao, 2022 对地震动参数衰减关系应用时涉及的地震动参数、地震参数、基本模型、回归方法等方面的要点进行了阐述。以华北地区为例，简要介绍了数十年我国工程抗震设防应用中常用的几组浅壳地震峰值加速度、加速度反应谱衰减关系的主要特点，并对其差异进行了比较分析。最后总结了我国现阶段衰减关系研究的不足，对其未来发展方向进行了展望。
Liang Xiao, Yanxiang Yu
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Dizhen xuebao, 2018 为更高效合理地生成与设计反应谱相符的人造地震动信号，本文基于自主开发的地震动信号处理软件EQSignal对人造地震动生成过程中涉及的几个问题进行了探讨，并通过对单自由度简谐共振体系的响应分析，提出了具体的解决建议：① 反应谱求解时应该对高频段和低频段分别采用频域传递函数法和逐步积分法求解；② 反应谱周期控制点的分布模式也应分段处理，短周期段宜采用对数平均分布，长周期段宜采用线性平均分布，反应谱总周期控制点不宜少于120个；③ 人造地震动反应谱与设计反应谱拟合的过程中 ...
Shuai Liu, Chao Pan, Zhiguang Zhou
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Dizhen xuebao, 2022 以强震动台站结构类型作为控制因素，基于集中质量显式时域动力有限元方法，系统地分析了不同场地条件下观测室结构（砌体观测房、半地下观测室、玻璃钢罩观测室）对地震动的影响。通过对北京地球观象台院内并址观测实验台站捕获的地脉动和两次地震事件数据的处理并结合数值模拟结果，分析得到不同类型观测室对地震动的影响规律。结果表明：观测室结构对地震动的影响是客观存在的，由于观测室结构自振周期和体量不同，不同观测室对地震动的影响频带和影响程度亦存在差异，相较于其它结构对地震动的影响，玻璃钢罩观测室的影响频带较窄、影响程度最小。
Peixuan Liu, Xiaojun Li, Zhenghua Zhou
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