近断层脉冲型地震设计谱研究

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中国公路学报 ›› 2017, Vol. 30 ›› Issue (12) : 159-168,195.

抗震设计

近断层脉冲型地震设计谱研究

杨华平, 钱永久, 黎璟, 邵长江, 龚婉婷

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Design Response Spectra for Near-fault Pulse-like Ground Motions

YANG Hua-ping, QIAN Yong-jiu, LI Jing, SHAO Chang-jiang, GONG Wan-ting

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摘要

为考虑速度脉冲效应对近断层区域抗震设计反应谱的影响，提出了一种基于场地特征周期T_g和脉冲周期T_p的反应谱生成新方法，该方法将结构周期以T_g和T_p作为分界点，分3段进行归准化。使用Shahi和Baker提出的脉冲地震识别方法，从NGA-West2数据库中选取226组矩震级在5~7.9、断层距在0.07~60.9 km的脉冲地震记录，作为输入近断层脉冲型地震动记录集。采用MATLAB编制动力计算和统计分析程序，对比分析了T_g和T_p双周期规准（TTN）方法与既有非周期规准方法、单周期归准方法生成的近断层脉冲型地震反应谱在场地一致性、数据离散度等方面的优劣，在此基础上拟合得到了基于TTN速度放大系数β_v谱的近断层脉冲型地震抗震设计谱。研究结果表明，相比现有方法生成的反应谱，TTN方法生成的β_v谱具有显著优势：①各类场地上的均值谱一致性较佳，有利于更加高效地利用有限的脉冲地震动记录；②全周期范围内数据离散性较小，均值谱更具代表性；③各类场地上变异系数较为一致，可通过一个统一的系数调整全部场地上的均值谱数据保证率；④基于TTN方法的β_v谱提出的近断层脉冲型地震设计谱能较好地反映局部工程场地特性和速度脉冲效应对结构地震响应的影响。

Abstract

To consider the effect of velocity pulse on near-fault design response spectra, an innovative method incorporating site characteristic period T_g and pulse period T_p in the determination of the design spectra was proposed to generate normalized response spectra. The structural period was divided into three sections by taking T_g & T_p as dividing points. By adopting pulse seismic identification method proposed by Shahi and Baker, 226 groups of pulse-like ground motion records of which the seismic moments were between 5-7.9 and the fault distance between 0.07-60.9 km were selected from NGA-West2 data-base as the aggregate of near-fault pulse-like earthquake records. MATLAB was applied to conduct the dynamic calculations and statistical analysis, and to analyze the advantages and disadvantages of site consistency and data scatter of near-fault pulse-like seismic response spectra generated by T_g & T_p two-period normalization (TTN) approach as well as the existing non-periodic and single-period normalization approach, respectively. The design response spectra for bridges under near-fault pulse-like ground motions were obtained based on velocity magnification coefficient (β_v) spectra by means of TTN method. The results show that, compared with response spectra generated by existing methods, β_v spectra generated by TTN method present significant superiority:① The TTN β_v mean spectra show excellent consistency for different site conditions, which is conducive to efficiently utilizing limited pulse-like ground motion records. ②Data of TTN β_v spectra generated from earthquake records have little discreteness in all period ranges which allows better representativeness for the mean spectra. ③Variable coefficients for different site conditions show consistency and a unified coefficient is able to adjust assurance rate of mean spectra data on all regions. ④The proposed design response spectra for bridges under near-fault pulse-like ground motions based on TTN β_v spectra are capable of reflecting the influence of local site conditions and velocity pulse effect on the seismic responses of structures.

导出引用

杨华平, 钱永久, 黎璟, 邵长江, 龚婉婷. 近断层脉冲型地震设计谱研究[J]. 中国公路学报, 2017, 30(12): 159-168,195

YANG Hua-ping, QIAN Yong-jiu, LI Jing, SHAO Chang-jiang, GONG Wan-ting. Design Response Spectra for Near-fault Pulse-like Ground Motions[J]. China Journal of Highway and Transport, 2017, 30(12): 159-168,195

中图分类号： U442.5

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基金

中国工程院咨询研究项目（2015-05-ZD-002）

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