适用于我国抗震设计规范的位移设计谱方法

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (8) : 266-274.

论文

适用于我国抗震设计规范的位移设计谱方法

赵国臣1，徐龙军1，朱兴吉2 ，谢礼立1, 3

作者信息 +

A displacement design spectral method adapted to the Chinese seismic design code

ZHAO Guochen1, XU Longjun1, ZHU Xingji2, XIE Lili1, 3

Author information +

文章历史 +

摘要

由于位移参数更能科学、直观地描述建筑结构的抗震水平，基于位移的抗震设计方法已成为地震工程领域研究的热点。位移设计谱是基于位移的抗震设计方法中确定地震作用的重要参考依据。然而我国现行抗震设计规范（后简称规范）中尚未有关位移设计谱的相关规定。为便于实际应用，本文基于实际地震动位移反应谱的特征提出了一种能够适用于规范的位移设计谱方法。该方法未对规范参数做任何调整，仅增加了控制点周期TD和峰值地面位移PGD两个参数，且所增参数与规范相关参数具有一一对应的关系。鉴于基于力的抗震设计在工程实践中仍占据主导地位，本文给出的位移设计谱可与加速度设计谱互相转化。为避免与规范矛盾，当周期小于5Tg（场地特征周期）时，本文加速度设计谱与规范加速度设计谱一致。在长周期段，本文位移设计谱能够反映地震动平均位移反应谱的主要特征，且本文加速度设计谱与平均加速度反应谱吻合。本文的研究工作能服务于基于位移的抗震设计方法的工程应用，能为规范中设计谱相关内容的修订提供指导意见。

Abstract

Since displacement parameters can describe the seismic performance of structures more scientifically and intuitively, the displacement-based seismic design method has become a research hotspot in the field of Earthquake Engineering. Displacement design spectrum is an essential approach for determining the seismic load in displacement-based seismic design methods. However, the current version of the Chinese seismic design code (after this referred to as the code) does not have relevant provisions on the displacement design spectrum. This paper proposes a displacement design spectrum method adapted to the code based on the characteristics of the actual displacement response spectrum of ground motions to facilitate the practical application. This method does not modify the code parameters but only adds two parameters: control period TD and peak ground displacement PGD, and the added parameters have a one-to-one correspondence with the relevant code parameters. In view of the fact that the force-based seismic design method still plays a dominant role in engineering practice, the proposed displacement design spectrum can be transformed into the acceleration design spectrum. To avoid the contradiction with the code, the proposed acceleration design spectrum is consistent with the code design spectrum when the period is less than 5Tg (site characteristic period). In the long periods, the proposed displacement design spectrum can reflect the main characteristics of the average displacement response spectrum of ground motions, and the proposed acceleration design spectrum is consistent with the average acceleration response spectrum. The research work can serve for the engineering application of the displacement-based seismic design method and guide revising the content about the design spectrum in the code.

导出引用

赵国臣1，徐龙军1，朱兴吉2,谢礼立1, 3. 适用于我国抗震设计规范的位移设计谱方法[J]. 振动与冲击, 2023, 42(8): 266-274

ZHAO Guochen1, XU Longjun1, ZHU Xingji2, XIE Lili1, 3. A displacement design spectral method adapted to the Chinese seismic design code[J]. Journal of Vibration and Shock, 2023, 42(8): 266-274

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