【摘要】：隔震技術(shù)作為一種成熟的結(jié)構(gòu)控制技術(shù)近年來受到普遍推廣,并被逐步應(yīng)用到高層建筑結(jié)構(gòu)當(dāng)中。隔震結(jié)構(gòu)的分析計(jì)算通常采用動(dòng)力時(shí)程分析法,而合理選取地震動(dòng)記錄是時(shí)程分析的首要問題。本文針對高層隔震結(jié)構(gòu),建立能反映高層隔震結(jié)構(gòu)變形模式和動(dòng)力特性的簡化模型作為分析對象,開展時(shí)程分析過程中天然記錄和人工模擬記錄(時(shí)域調(diào)整譜匹配記錄、人工合成記錄)選取方法和適用性研究。對比研究采用不同的天然地震動(dòng)記錄選取方法高層隔震結(jié)構(gòu)反應(yīng)特征,分析不同方法用于高層隔震結(jié)構(gòu)的有效性;研究時(shí)域調(diào)整譜匹配記錄的選用、地震動(dòng)特性及其結(jié)構(gòu)反應(yīng)特征;對與設(shè)計(jì)譜對應(yīng)的功率譜特征及生成人工波過程中包絡(luò)函數(shù)的持時(shí)參數(shù)取值開展研究,對人工合成記錄的反應(yīng)特征進(jìn)行對比分析研究。研究工作主要得到以下結(jié)論:(1)隔震結(jié)構(gòu)在強(qiáng)震作用下反應(yīng)進(jìn)入非線性,與結(jié)構(gòu)反應(yīng)相關(guān)的反應(yīng)譜頻段延長,采用反應(yīng)譜雙頻段選波方法必須合理選取控制頻段才能實(shí)現(xiàn)選波目的,依據(jù)地震信息選波方法與結(jié)構(gòu)動(dòng)力特性無關(guān),可適用于不同類型結(jié)構(gòu)的抗震性能分析,合理選取并控制地震動(dòng)參數(shù)也能有效降低反應(yīng)的離散性,最不利選波方法能有效篩選出對結(jié)構(gòu)破壞性較大的記錄,適合于對結(jié)構(gòu)安全性進(jìn)行校核。(2)時(shí)域調(diào)整譜匹配記錄能有效獲取穩(wěn)定的結(jié)構(gòu)位移反應(yīng),降低反應(yīng)的離散性,減少獲得穩(wěn)定結(jié)果所需的記錄數(shù)量。選用時(shí)域調(diào)整譜匹配記錄時(shí),建議采用與目標(biāo)反應(yīng)譜偏差較小的記錄作為原始記錄。以我國規(guī)范作為目標(biāo)譜需要注意地震動(dòng)長周期特性發(fā)生改變以及由此引起能量分析結(jié)果偏大的現(xiàn)象。(3)提出基于能量確定合成人工記錄過程持時(shí)參數(shù)取值的方法,給出依據(jù)不同場地設(shè)計(jì)譜生成人工記錄持時(shí)參數(shù)的建議取值,實(shí)現(xiàn)人工合成記錄的能量反應(yīng)結(jié)果較好地符合地震動(dòng)記錄的反應(yīng)特征。研究成果為高層隔震結(jié)構(gòu)時(shí)程分析地震動(dòng)記錄的選取提供了指導(dǎo),對可靠進(jìn)行結(jié)構(gòu)基于性能的抗震設(shè)計(jì)具有重要意義。
[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.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU973.31

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