非平衡人造地震动反应谱拟合技术研究
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摘要
近年来随着我国经济建设的高速发展,高层建筑、超高层建筑、大跨度桥梁、不规则建筑以及特殊结构建筑物不断增加。这就对当前的抗震设计提出了更高的要求。在对上述复杂而重要的建筑结构进行抗震设计过程中,需要对结构物在地震动作用下的整个过程进行动力分析。这就需要有足够数量的、满足一定地震环境和场地条件的地震动时程作为结构动力分析的输入,其来源主要有两个方面:实际观测的地震动记录和人造地震动时程。受到我国观测强震条件的限制,当前观测的地震记录难以满足工程抗震设计的要求,因此需要提供满足不同场地条件以及地震环境的人造地震动。
地震动的反应谱的拟合是人造地震动所要面对的基本研究课题,很多学者给出了多种研究方法。本文提出一种在传统的通过调整傅立叶幅值谱以拟合目标反映谱的基础上根据不同的场地条件和地震环境引入非平稳的相位来拟合目标反应谱。从大量的地震动实测记录中,得到其非平稳相位谱再应用于人造地震动反应谱拟合过程中,这本身就提高了人造地震动的宏观特性和准确性,能够真实的体现人造地震动受不同的场地特性和地震环境的影响。
本文主要研究进展有三个方面:
一方面,本文编制、调整人造地震动反应谱拟合的计算程序,并通过数值计算在实测的各地区地震动时程中得到傅立叶幅值谱和相位谱,作为程序输入,从而得到真正意义上的非平稳人造地震动。并提出了非平稳人造地震动反应谱拟合的工作步骤及重点解决问题。
另一方面,为满足重要工程对设计地震动的需要,本文研究了一种考虑场地附近天然地震记录数据相位非平稳特性、同时拟合PGA、PGV和SA(T)的人造地震动技术,区域强震记录提取的天然地震动非平稳相位,进行了非平稳人造地震动的合成。研究成果可为人造地震动反应谱的工程应用提供参考。
再一方面,本文采用非平稳人造地震动反应谱拟合技术,合成能够体现天津地区各类场地特性的人造地震动时程,即从天津附近场地已发生过的天然地震记录中提取非平稳相位,并将其作为控制条件,合成能够体现天津地区震源特性及各类场地相关性的人造地震动时程,进而为天津抗震减灾工程服务。
In recent years, along with the rapid development of economic construction in China, there are more and more high-rise buildings, super high-rise building, large-span bridge construction and special construction and so on. The higher request is put forward in the current seismic design. In the process of seismic design of the complex and important building, it should be considered in dynamic analysis of structures through the whole process of ground motion. So it's need enough ground motion time history which can fit certain earthquake environment and the site conditions as the inputting of dynamic structural analysis. It mainly come from two ways: seismic record with actual observation and artificial ground motion time history. with the restriction of strong earthquake observation condition, current seismic records are hard to meet the requirement of the seismic design, so it should be offered that more artificial ground motion time history which could meet different site conditions and earthquake environment.
The fitting response spectrum is a basic task of artificial ground motion time history, there are many scholars offer many kinds of way. This text offer a technique to generate totally non-stationary ground motion spectrum with non-stationary phase as the consideration of site conditions and earthquake environment and it is on the base of traditional technic which only take consideration of non-stationary amplitude to fit target response spectrum. This new way using non-stationary which is picking from the actual observation record can reveal the macroscopic property of artificial of ground motion time history and raise accuracy, so this way can truly reflect the influence of the site conditions and earthquake environment.
There are three research in this text:
The first, compiling and adjusting the response spectrum fitting computer procedure of artificial ground motion time history and get the amplitude spectrum and phase spectrum from actual ground motion record with numeric calculation, input the amplitude spectrum and phase spectrum to the computer procedure to offer the totally non-stationary ground motion time history. With that, the work step and important issue of non-stationary ground motion time history of response spectrum compatible are also offered in the text.
The second, In order to meet the requirement of important projects for design ground motion, a new artificial ground motion technology was researched to consider non-stationary phase from earthquake record near site and to fit compatible PGA, PGV, SA(T) simultaneously. This new technology is applied to generating the non-stationary artificial ground motion which obtained from the strong motion record of this region. The result of the paper can supply an example and foundation for the engineering application of artificial ground motion response-spectrum.
The third, using the new technique of non-stationary ground motion time history of response spectrum to generate the ground motion time history of Tianjin area which can reflect the site character of Tianjin.It means that pick the non-stationary phase from the ground motion record of Tianjin site to generate artificial ground motion time history which could reflect the site character and earthquake environment of Tianjin site. It can give service to seismic design of Tianjin area.
地震动的反应谱的拟合是人造地震动所要面对的基本研究课题,很多学者给出了多种研究方法。本文提出一种在传统的通过调整傅立叶幅值谱以拟合目标反映谱的基础上根据不同的场地条件和地震环境引入非平稳的相位来拟合目标反应谱。从大量的地震动实测记录中,得到其非平稳相位谱再应用于人造地震动反应谱拟合过程中,这本身就提高了人造地震动的宏观特性和准确性,能够真实的体现人造地震动受不同的场地特性和地震环境的影响。
本文主要研究进展有三个方面:
一方面,本文编制、调整人造地震动反应谱拟合的计算程序,并通过数值计算在实测的各地区地震动时程中得到傅立叶幅值谱和相位谱,作为程序输入,从而得到真正意义上的非平稳人造地震动。并提出了非平稳人造地震动反应谱拟合的工作步骤及重点解决问题。
另一方面,为满足重要工程对设计地震动的需要,本文研究了一种考虑场地附近天然地震记录数据相位非平稳特性、同时拟合PGA、PGV和SA(T)的人造地震动技术,区域强震记录提取的天然地震动非平稳相位,进行了非平稳人造地震动的合成。研究成果可为人造地震动反应谱的工程应用提供参考。
再一方面,本文采用非平稳人造地震动反应谱拟合技术,合成能够体现天津地区各类场地特性的人造地震动时程,即从天津附近场地已发生过的天然地震记录中提取非平稳相位,并将其作为控制条件,合成能够体现天津地区震源特性及各类场地相关性的人造地震动时程,进而为天津抗震减灾工程服务。
In recent years, along with the rapid development of economic construction in China, there are more and more high-rise buildings, super high-rise building, large-span bridge construction and special construction and so on. The higher request is put forward in the current seismic design. In the process of seismic design of the complex and important building, it should be considered in dynamic analysis of structures through the whole process of ground motion. So it's need enough ground motion time history which can fit certain earthquake environment and the site conditions as the inputting of dynamic structural analysis. It mainly come from two ways: seismic record with actual observation and artificial ground motion time history. with the restriction of strong earthquake observation condition, current seismic records are hard to meet the requirement of the seismic design, so it should be offered that more artificial ground motion time history which could meet different site conditions and earthquake environment.
The fitting response spectrum is a basic task of artificial ground motion time history, there are many scholars offer many kinds of way. This text offer a technique to generate totally non-stationary ground motion spectrum with non-stationary phase as the consideration of site conditions and earthquake environment and it is on the base of traditional technic which only take consideration of non-stationary amplitude to fit target response spectrum. This new way using non-stationary which is picking from the actual observation record can reveal the macroscopic property of artificial of ground motion time history and raise accuracy, so this way can truly reflect the influence of the site conditions and earthquake environment.
There are three research in this text:
The first, compiling and adjusting the response spectrum fitting computer procedure of artificial ground motion time history and get the amplitude spectrum and phase spectrum from actual ground motion record with numeric calculation, input the amplitude spectrum and phase spectrum to the computer procedure to offer the totally non-stationary ground motion time history. With that, the work step and important issue of non-stationary ground motion time history of response spectrum compatible are also offered in the text.
The second, In order to meet the requirement of important projects for design ground motion, a new artificial ground motion technology was researched to consider non-stationary phase from earthquake record near site and to fit compatible PGA, PGV, SA(T) simultaneously. This new technology is applied to generating the non-stationary artificial ground motion which obtained from the strong motion record of this region. The result of the paper can supply an example and foundation for the engineering application of artificial ground motion response-spectrum.
The third, using the new technique of non-stationary ground motion time history of response spectrum to generate the ground motion time history of Tianjin area which can reflect the site character of Tianjin.It means that pick the non-stationary phase from the ground motion record of Tianjin site to generate artificial ground motion time history which could reflect the site character and earthquake environment of Tianjin site. It can give service to seismic design of Tianjin area.
引文
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[8]赵凤新,张郁山.人造地震动反应谱拟合的窄带时程叠加法[J].工程力学,2007,24(2):87—91
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