本文選題：等效速度譜 + 累積塑性變形能��； 參考：《西安建筑科技大學》2014年博士論文

【摘要】：基于能量抗震設計方法融合了力和位移這兩個重要的結構設計參數(shù)，能夠全面反映地震作用對結構的影響，但如何將能量概念用于具體結構的抗震設計仍是一個具有挑戰(zhàn)性的課題。 本文針對RC框架結構基于能量抗震性能評估方法進行了系統(tǒng)深入的研究。主要工作如下： 對比了四種不同類型單自由度（SDOF）體系的地震能量時程反應、地震動總輸入能及瞬時輸入能分配情況；對比了多自由度（MDOF）體系相對位移和絕對位移能量平衡方程表示的總輸入能、最大瞬時輸入能及其出現(xiàn)時間的差異。 提出了一種適用于我國場地土類型，且便于實際應用的彈塑性SDOF體系歸一化等效速度譜。將從美國PEER地震記錄數(shù)據(jù)庫選取的220條強震記錄按中國場地土類型進行分類，并以此作為地震輸入。建議了一種基于復合強度指標的彈性SDOF體系三段式歸一化等效速度譜。分析了五類場地土條件下剛度折減系數(shù)、延性系數(shù)和阻尼比對SDOF體系歸一化等效速度譜的影響，進而提出了一種適用于我國場地土類型，且便于實際使用的彈塑性SDOF體系歸一化等效速度譜，，并驗證了該方法的有效性。 推導了累積塑性變形能需求量及其沿結構各層的分配系數(shù)�；谀芰科胶庠砗投嗄B(tài)等效單自由度(ESDOF)體系的概念，推導了剪切型MDOF體系累積塑性變形能需求量及其沿結構各層的分配系數(shù)。在此基礎上，通過16種工況下的單因素敏感性分析，對累積塑性變形能分配系數(shù)公式進行簡化，以便于工程應用。同時得出以下結論：累積塑性變形能分配系數(shù)主要由質量、屈服剪力系數(shù)、剛度和累積塑性變形倍數(shù)四個因素決定；頂層參數(shù)變化對累積塑性變形能分布無明顯影響；逐層遞減和中間層薄弱情況下，各層分配的累積塑性變形能與屈服剪力系數(shù)和累積塑性變形倍數(shù)呈正相關，與剛度呈反相關；中間薄弱層釋放的累積塑性變形能按其相鄰兩層原累積塑性變形能大小之比進行重新分配。 提出了一種基于層的“半解析半數(shù)值”雙參數(shù)損傷模型。針對既有雙參數(shù)損傷模型基于構件損傷指數(shù)判定結構各層及整體損傷時，計算工作量大，容易產(chǎn)生累積誤差，且判定結果受構件損傷指數(shù)組合方式影響較大的不足。結合第四章研究成果，針對RC框架結構，提出了一種基于層的“半解析半數(shù)值”雙參數(shù)損傷模型，彌補了既有構件損傷模型對各層進行損傷評估時的不足。并將應用本文損傷模型計算得到的層間損傷模式與Park-Ang模型的計算結果進行對比，驗證了本文所提出模型的有效性。 分析了RC框架結構的耗能需求及分布規(guī)律。通過改變周期折減系數(shù)，近似考慮填充墻對RC框架結構在大震作用下耗能分布的影響，并給出定量計算方法。根據(jù)彈塑性時程分析得到的累積塑性變形能沿樓層的分布情況，對第四章推導的各層累積塑性變形能分配系數(shù)公式進行修正。 結合現(xiàn)有的基于能量抗震設計方法，提出了RC框架結構基于能量抗震性能評估方法，對RC框架結構在大震下的層間損傷模式和安全性進行評估。根據(jù)前面各章研究成果，給出基于能量抗震性能能評估方法的一般步驟，并通過算例說明了該方法的應用。
[Abstract]:The two important structural design parameters, such as force and displacement, can fully reflect the impact of seismic action on the structure, but it is still a challenging task to apply the energy concept to the seismic design of concrete structures.
In this paper, the energy based seismic performance evaluation method of RC frame structure has been systematically studied. The main work is as follows:
The seismic energy time history response of four different types of single degree of freedom (SDOF) system, the total input energy of ground motion and the distribution of instantaneous input energy are compared, and the total input energy of the relative displacement and the absolute displacement energy balance equation of the MDOF system is compared, and the difference of the maximum transient input energy and its occurrence time is compared.
A kind of elastoplastic SDOF system normalized equivalent velocity spectrum is proposed, which is suitable for the type of soil and soil in China and is convenient for practical application. 220 strong earthquakes selected from the PEER seismic record database of the United States are classified according to the type of Chinese soil and soil, and as an earthquake input, an elastic SDOF body based on the composite strength index is proposed. The three segment normalized equivalent velocity spectrum is used to analyze the influence of the stiffness reduction coefficient, the ductility coefficient and the damping ratio on the normalized equivalent velocity spectrum of the SDOF system under the condition of five types of ground soil, and then a kind of normalized equivalent velocity spectrum is proposed which is suitable for the type of soil and soil in our country and is convenient for the actual use of the elastoplastic system, and the formula is verified. The validity of the law.
The accumulative plastic deformation energy demand and the distribution coefficient along each layer are derived. Based on the energy balance principle and the concept of multimodal equivalent single freedom (ESDOF) system, the accumulative plastic deformation energy demand and the distribution coefficient along the structure of the shear type MDOF system are derived. On this basis, the single factor sensitivity under 16 operating conditions is carried out. The formula of cumulative plastic deformation energy distribution coefficient is simplified to facilitate engineering application. At the same time, the following conclusion is drawn that the cumulative plastic deformation energy distribution coefficient is mainly determined by four factors, such as mass, yield shear coefficient, stiffness and cumulative plastic deformation multiplier, and the variation of roof parameters has no explicit development on cumulative plastic deformation energy distribution. The cumulative plastic deformation of each layer is positively correlated with the yield shear coefficient and the cumulative plastic deformation multiple, and the cumulative plastic deformation can be redistributed according to the ratio of the cumulative plastic deformation energy of the two adjacent layers.
A double parameter damage model of "semi analytic semi numerical" based on layer is proposed. The calculation work is large and the cumulative error is easy to be produced when both the structure layers and the whole damage are determined based on the component damage index based on the damage index of the two parameter damage model, and the result is greatly influenced by the combination of damage index of the component. According to the RC frame structure, a double parameter damage model of "semi analytic semi numerical" based on layer is proposed, which makes up for the deficiency of damage assessment of the existing damage model of the existing component, and compares the interlayer damage model calculated with the damage model in this paper with the calculation results of the Park-Ang model. The validity of the proposed model is proposed.
The energy consumption demand and distribution law of the RC frame structure are analyzed. By changing the cycle reduction coefficient, the influence of the filling wall on the energy dissipation distribution of the RC frame structure under large earthquake action is considered, and the quantitative calculation method is given. According to the elastoplastic time history analysis, the cumulative plastic deformation can be distributed along the floor, and the fourth chapters are derived. The formula of cumulative energy distribution coefficient of plastic deformation is corrected.
Combined with the existing energy seismic design method, the RC frame structure based on the energy seismic performance evaluation method is proposed to evaluate the interlayer damage mode and safety of the RC frame structure under large earthquakes. According to the research results of the previous chapters, the general steps based on the evaluation method of energy seismic performance are given, and the example is illustrated by an example. The application of this method.
【學位授予單位】：西安建筑科技大學
【學位級別】：博士
【學位授予年份】：2014
【分類號】：TU375.4;TU352.11

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