基于简化模型的高层隔震结构地震动记录选取方法研究
发布时间：2018-11-10 14:15
【摘要】：隔震技术作为一种成熟的结构控制技术近年来受到普遍推广,并被逐步应用到高层建筑结构当中。隔震结构的分析计算通常采用动力时程分析法,而合理选取地震动记录是时程分析的首要问题。本文针对高层隔震结构,建立能反映高层隔震结构变形模式和动力特性的简化模型作为分析对象,开展时程分析过程中天然记录和人工模拟记录(时域调整谱匹配记录、人工合成记录)选取方法和适用性研究。对比研究采用不同的天然地震动记录选取方法高层隔震结构反应特征,分析不同方法用于高层隔震结构的有效性;研究时域调整谱匹配记录的选用、地震动特性及其结构反应特征;对与设计谱对应的功率谱特征及生成人工波过程中包络函数的持时参数取值开展研究,对人工合成记录的反应特征进行对比分析研究。研究工作主要得到以下结论:(1)隔震结构在强震作用下反应进入非线性,与结构反应相关的反应谱频段延长,采用反应谱双频段选波方法必须合理选取控制频段才能实现选波目的,依据地震信息选波方法与结构动力特性无关,可适用于不同类型结构的抗震性能分析,合理选取并控制地震动参数也能有效降低反应的离散性,最不利选波方法能有效筛选出对结构破坏性较大的记录,适合于对结构安全性进行校核。(2)时域调整谱匹配记录能有效获取稳定的结构位移反应,降低反应的离散性,减少获得稳定结果所需的记录数量。选用时域调整谱匹配记录时,建议采用与目标反应谱偏差较小的记录作为原始记录。以我国规范作为目标谱需要注意地震动长周期特性发生改变以及由此引起能量分析结果偏大的现象。(3)提出基于能量确定合成人工记录过程持时参数取值的方法,给出依据不同场地设计谱生成人工记录持时参数的建议取值,实现人工合成记录的能量反应结果较好地符合地震动记录的反应特征。研究成果为高层隔震结构时程分析地震动记录的选取提供了指导,对可靠进行结构基于性能的抗震设计具有重要意义。
[Abstract]:As a mature structural control technology, seismic isolation technology has been widely used in recent years, and has been gradually applied to high-rise building structures. Dynamic time-history analysis is usually used in the analysis and calculation of isolated structures, and the rational selection of ground motion records is the most important problem in time-history analysis. In this paper, a simplified model which can reflect the deformation mode and dynamic characteristics of high-rise isolated structures is established as the object of analysis. The natural records and artificial simulation records (time-domain adjusted spectrum matching records) are carried out in the process of time-history analysis. Methods of selection and applicability of synthetic records. The response characteristics of high-rise isolated structures using different natural ground motion recording methods are compared and the effectiveness of different methods used in high-rise isolated structures is analyzed. The selection of time-domain adjusted spectrum matching records, the characteristics of ground motion and its structural response characteristics are studied. The characteristics of the power spectrum corresponding to the design spectrum and the duration parameters of the envelope function in the process of generating artificial waves are studied, and the response characteristics of the synthetic records are compared and analyzed. The main conclusions are as follows: (1) the response of isolated structures under strong earthquake is nonlinear, and the frequency band of response spectrum related to structural response is prolonged. In order to achieve the purpose of wave selection, the response spectrum dual-band wave selection method must be reasonably selected in order to achieve the purpose of wave selection. According to the seismic information, the method of wave selection is independent of the dynamic characteristics of the structure and can be applied to the seismic performance analysis of different types of structures. Reasonably selecting and controlling the parameters of ground motion can also effectively reduce the dispersion of the response, and the most unfavorable wave selection method can effectively screen out the most destructive records of the structure. It is suitable for structural safety verification. (2) Time-domain adjusted spectrum matching records can effectively obtain stable structural displacement response, reduce the dispersion of response and reduce the number of records needed to obtain stable results. When the time-domain adjusted spectrum matching record is selected, it is suggested that the record with small deviation from the target response spectrum be used as the original record. Taking the target spectrum of our country as the target spectrum, we should pay attention to the change of long-period characteristic of ground motion and the phenomenon that the result of energy analysis is too large. (3) the method of determining the duration parameter of synthetic artificial record process based on energy is proposed. According to the design spectrum of different sites, the suggested values of the parameters of artificial recording duration are given, and the energy response results of artificial synthetic records are in good agreement with the response characteristics of ground motion records. The research results provide guidance for the selection of ground motion records for time-history analysis of high-rise isolated structures, and are of great significance for reliable performance-based seismic design of structures.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU973.31
本文编号：2322693
[Abstract]:As a mature structural control technology, seismic isolation technology has been widely used in recent years, and has been gradually applied to high-rise building structures. Dynamic time-history analysis is usually used in the analysis and calculation of isolated structures, and the rational selection of ground motion records is the most important problem in time-history analysis. In this paper, a simplified model which can reflect the deformation mode and dynamic characteristics of high-rise isolated structures is established as the object of analysis. The natural records and artificial simulation records (time-domain adjusted spectrum matching records) are carried out in the process of time-history analysis. Methods of selection and applicability of synthetic records. The response characteristics of high-rise isolated structures using different natural ground motion recording methods are compared and the effectiveness of different methods used in high-rise isolated structures is analyzed. The selection of time-domain adjusted spectrum matching records, the characteristics of ground motion and its structural response characteristics are studied. The characteristics of the power spectrum corresponding to the design spectrum and the duration parameters of the envelope function in the process of generating artificial waves are studied, and the response characteristics of the synthetic records are compared and analyzed. The main conclusions are as follows: (1) the response of isolated structures under strong earthquake is nonlinear, and the frequency band of response spectrum related to structural response is prolonged. In order to achieve the purpose of wave selection, the response spectrum dual-band wave selection method must be reasonably selected in order to achieve the purpose of wave selection. According to the seismic information, the method of wave selection is independent of the dynamic characteristics of the structure and can be applied to the seismic performance analysis of different types of structures. Reasonably selecting and controlling the parameters of ground motion can also effectively reduce the dispersion of the response, and the most unfavorable wave selection method can effectively screen out the most destructive records of the structure. It is suitable for structural safety verification. (2) Time-domain adjusted spectrum matching records can effectively obtain stable structural displacement response, reduce the dispersion of response and reduce the number of records needed to obtain stable results. When the time-domain adjusted spectrum matching record is selected, it is suggested that the record with small deviation from the target response spectrum be used as the original record. Taking the target spectrum of our country as the target spectrum, we should pay attention to the change of long-period characteristic of ground motion and the phenomenon that the result of energy analysis is too large. (3) the method of determining the duration parameter of synthetic artificial record process based on energy is proposed. According to the design spectrum of different sites, the suggested values of the parameters of artificial recording duration are given, and the energy response results of artificial synthetic records are in good agreement with the response characteristics of ground motion records. The research results provide guidance for the selection of ground motion records for time-history analysis of high-rise isolated structures, and are of great significance for reliable performance-based seismic design of structures.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU973.31
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