本文關鍵詞：輕型消能搖擺結構體系抗震性能評估與動力可靠度分析　出處：《蘭州理工大學》2013年博士論文　論文類型：學位論文

  更多相關文章： 搖擺結構體系 基于性能的抗震設計 IDA 虛擬激勵法 動力可靠度 振動臺試驗

【摘要】：在我國現(xiàn)有及新建建筑中,鋼筋混凝土框架結構是最主要的結構體系,但是從近年來幾次實震的震害來看,鋼筋混凝土框架結構在地震中的表現(xiàn)并不盡如人意。究其原因不難發(fā)現(xiàn),現(xiàn)行的鋼筋混凝土框架結構抗震設計方法在整體的抗震設計上仍存在不均勻性,同時由于各方面條件的限制在施工過程中存在諸多不確定性的危險因素,因此鋼筋混凝土框架結構在強烈地震作用下會有很多的安全性問題。如何切實有效的提高現(xiàn)有或新建鋼筋混凝土框架結構在地震作用下的可靠性和安全性,成為工程設計人員與研究人員關注的焦點之一。本文針對這一問題,在現(xiàn)有研究成果的基礎之上提出了輕型消能搖擺結構體系的結構設計方案,利用基于性能的抗震設計理論,系統(tǒng)的研究了輕型消能搖擺結構體系在地震動作用下的變形模式、耗能機制以及動力可靠度等問題。主要內容包括以下幾個方面： (1)首先以實際工程結構為研究對象,分別構建了鋼筋混凝土框架結構、輕型搖擺剛架結構和輕型消能搖擺剛架結構的精確有限元模型。其次對鋼筋混凝土框架結構體系和輕型搖擺剛架結構體系分別進行基于位移的靜力彈塑性推覆分析。最后以所獲得分析結果為依據(jù),結合我國現(xiàn)行建筑抗震設計規(guī)范,著重探討了不同剛度比的鋼管混凝土搖擺剛架對結構體系整體抗震性能的影響。 (2)針對鋼筋混凝土框架結構、輕型搖擺剛架結構和輕型消能搖擺剛架結構三種結構體系建立了動力計算模型和運動微分方程。首先利用動力彈塑性時程分析法對其進行分析求解,獲得了各結構體系在地震動作用下的結構動力響應。其次從能量的角度出發(fā),利用能量法對三種結構體系的耗能機制進行計算和研究。最終探討了三種結構體系在強烈地震作用下的動力響應和耗能機制對各結構體系抗震性能的影響。 (3)采用增量動力分析方法,選取實際地震動記錄20條,對鋼筋混凝土框架結構、輕型搖擺剛架結構和輕型消能搖擺剛架結構三種結構體系進行從彈性到彈塑性,直至結構失效全過程的分析。依據(jù)所獲取的分析結果,繪制了各結構體系基于不同損傷指標的IDA曲線,并分別對其進行16%、50%、84%分位的IDA曲線分析,獲取了不同水平地震動作用下各結構體系的抗震性能水準。 (4)對輕型搖擺剛架結構體系的隨機響應進行了分析,在考慮了地震動作用的不確定性的同時,利用虛擬激勵法與狀態(tài)空間分析相結合的方法,計算了不同剛度比的鋼管混凝土搖擺剛架對輕型搖擺剛架結構體系在多遇及罕遇地震動作用下動力可靠度的影響。根據(jù)所獲取的各層的條件失效概率進一步計算了各結構體系的條件失效概率 (5)針對各結構體系的地震動響應,進行了模擬地震動的振動臺試驗研究。結合實際工程和理論分析,分別制作了鋼筋混凝土框架結構、輕型搖擺剛架結構和輕型消能搖擺剛架結構的的縮尺試驗模型,并最終進行了33個工況的振動臺實驗,得到了動力荷載作用下結構模型各測點的動力響應數(shù)據(jù)。通過與理論分析和數(shù)值仿真的計算結果相對比,發(fā)現(xiàn)試驗的最終結果與理論分析的規(guī)律相吻合。
[Abstract]:In our existing and new buildings, the reinforced concrete frame structure is the main structure system, but from several real earthquake disaster in recent years, performance of reinforced concrete frame structure in the earthquake is not satisfactory. The reason is not difficult to find the existing reinforced concrete frame structure seismic mix design method is not the uniformity in the seismic design of the whole, at the same time, due to various constraints there are many uncertainties in the risk factors in the construction process, so the reinforced concrete frame structure under the strong earthquake will have many security problems. How to effectively improve the existing or new reinforced concrete frame structure reliability and safety in the earthquake under the action of the engineering staff and become one of the focus of the researchers. Aiming at this problem, on the basis of the existing research results. The light energy dissipation structure design of swing structure system, using the theory of performance-based seismic design, system of structure vibration swing deformation mode under the action of light energy dissipation, energy dissipation mechanism and dynamic reliability problems. The main contents include the following aspects:
(1) first to actual engineering structure as the research object, were constructed of reinforced concrete frame structure, frame structure and light swing light energy dissipation frame rocking precise finite element model. The reinforced concrete frame structure and light swing frames are respectively analyzed static elastic plastic displacement nappe based on the analysis of the results obtained in the end. As the basis, combined with the current seismic design code for building, discusses the influence of stiffness ratio of CFST frame swing overall seismic performance of structure system.
(2) for reinforced concrete frame structure, frame structure and light swing light energy dissipation swing frame structure of three kinds of structure system to establish a dynamic calculation model and the differential equations of motion. The dynamic elastic-plastic time history analysis method to carry on the analysis, obtained the structure in the seismic structure under dynamic loads the response from the perspective of energy. Secondly, calculation and research using the energy method, energy dissipation mechanism of three kinds of structure system. Finally discusses the influence of three kinds of structure system under the strong earthquake dynamic response and energy dissipation mechanism on the seismic performance of the structure of the system.
(3) the incremental dynamic analysis method, select the actual record of 20, the reinforced concrete frame structure, frame structure and light swing light energy dissipation swing frame structure of three kinds of architecture from elastic to elastic-plastic failure analysis, the whole process of the structure. According to the analysis results to the acquisition. The contours of the structure system based on the IDA curve of different damage index, and 16% respectively, on the 50%, IDA analysis of 84% points, get a different level of ground motion under the action of the seismic performance level of the structure of the system.
(4) random response to light swing frame structures are analyzed, considering the effect of ground motion uncertainty at the same time, combined with the method of using virtual excitation method and state space analysis, calculation of the different stiffness ratio of CFST frame of lightweight swing swing frame structure system in dynamic effect the reliability under frequent earthquake and rare earthquake. According to each layer of the conditional failure probability of further calculate the conditional failure probability of structure system
(5) according to the structure of the seismic response, the shaking table test of seismic simulation. Combined with the practical engineering and theoretical analysis are made of reinforced concrete frame structure, frame structure and light swing light energy dissipation swing frame structure of the scale test model, and finally the 33 conditions. The shaking table experiment, obtained the measuring point dynamic structure model under dynamic load response data. Through theoretical analysis and numerical simulation calculation and comparison of the results, found the final results and theoretical analysis are consistent.

【學位授予單位】：蘭州理工大學
【學位級別】：博士
【學位授予年份】：2013
【分類號】：TU352.11

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