本文選題：結(jié)構(gòu)抗震性能評估 + 強(qiáng)度需求譜　； 參考：《湖南大學(xué)》2014年博士論文

【摘要】：基于性能的抗震設(shè)計(jì)是21世紀(jì)抗震設(shè)計(jì)理論的一個主要研究方向。盡管這一理論從提出到目前為止已有幾十年的時間，在理論研究以及實(shí)際應(yīng)用都有了較大的發(fā)展。但目前來講，該方法離實(shí)際應(yīng)用和納入規(guī)范還有較大的距離�；谛阅艿目拐鹪O(shè)計(jì)其實(shí)主要分為對基于性能的抗震評估以及設(shè)計(jì)方法的研究。本文也是圍繞這兩方面開展了研究工作。 1.選用一定數(shù)量的遠(yuǎn)、近場記錄對大量單自由度結(jié)構(gòu)進(jìn)行時程分析后，給出了等延性強(qiáng)度折減系數(shù)R的概率模型。該強(qiáng)度折減模型綜合考慮了位移延性、場地土類別、遠(yuǎn)、近場地震等因素的影響；并引入了場地特征周期Tg對橫坐標(biāo)進(jìn)行標(biāo)準(zhǔn)化處理，這樣可以令由遠(yuǎn)、近場地震記錄所得到結(jié)構(gòu)強(qiáng)度需求統(tǒng)一在一個數(shù)學(xué)模型里。 2.選擇多個強(qiáng)度指標(biāo)與近場地震作用下結(jié)構(gòu)能量需求之間進(jìn)行了相關(guān)性分析，并得到了最優(yōu)的強(qiáng)度指標(biāo)IA（相關(guān)程度最高）。假定結(jié)構(gòu)在往復(fù)地震作用下發(fā)生的滯回變形幅值相等，并對同一幅值作用下結(jié)構(gòu)能經(jīng)受的最大滯回環(huán)數(shù)neq進(jìn)行了估計(jì)，建立了其與兩參數(shù)（強(qiáng)度指標(biāo)IA以及強(qiáng)度折減系數(shù)R）間的關(guān)系，并由統(tǒng)計(jì)分析后得到其回歸模型。并以此為基礎(chǔ)，進(jìn)一步推導(dǎo)了滯回耗能模型以及總輸入能模型。為了對比彈性輸入能和非彈性輸入能，本文引入了能量折減系數(shù)RE來考慮這一差異。 3.闡述Pushover方法的理論背景，認(rèn)為對目標(biāo)位移估計(jì)的精度是Pushover方法能否準(zhǔn)確評估結(jié)構(gòu)抗震性能的關(guān)鍵。文中從能量的角度來估計(jì)結(jié)構(gòu)的目標(biāo)位移；引入了層間剪力放大系數(shù)來體現(xiàn)結(jié)構(gòu)地震水平力的分布；最后在自適應(yīng)Pushover分析過程的基礎(chǔ)上，提出了基于結(jié)構(gòu)滯回耗能的Pushover分析方法。另外，結(jié)合了能力譜法對比分析了在兩種位移需求譜下基于位移的抗震設(shè)計(jì)。最后，選用本文所提出的Pushover分析方法對所設(shè)計(jì)框架結(jié)構(gòu)進(jìn)行了抗震性能評估。 4.從能量平衡原則著手，本文建立了結(jié)構(gòu)外部輸入能與結(jié)構(gòu)內(nèi)部耗能之間的聯(lián)系，并由此建立了基于能量的設(shè)計(jì)流程。該設(shè)計(jì)流程中還考慮了非彈性輸入能、結(jié)構(gòu)滯回模型以及遠(yuǎn)、近場地震記錄等因素分別對設(shè)計(jì)結(jié)果的影響。最后，文中給出了單自由度結(jié)構(gòu)（橋墩）以及多自由度結(jié)構(gòu)的設(shè)計(jì)實(shí)例，驗(yàn)證了該設(shè)計(jì)方法的實(shí)用性。 5.推導(dǎo)結(jié)構(gòu)的損傷指數(shù)模型，并且根據(jù)所提出的損傷模型對結(jié)構(gòu)進(jìn)行了損傷評估（易損性曲線）。在所構(gòu)造的易損性曲線中，選用了與結(jié)構(gòu)滯回耗能相關(guān)程度較高的IA強(qiáng)度指標(biāo)作為橫坐標(biāo)。另外，，對相似框架結(jié)構(gòu)的分析結(jié)果進(jìn)行組合后，給出了組合的易損性曲線。最后，通過對一多層框架結(jié)構(gòu)進(jìn)行易損性分析，驗(yàn)證了本文方法的實(shí)用性。
[Abstract]:Performance-based seismic design is one of the main research directions of seismic design theory in the 21 st century. Although this theory has been put forward for several decades, it has made great progress in both theoretical research and practical application. But at present, the method is far from practical application and standard. In fact, performance-based seismic design is mainly divided into performance-based seismic evaluation and design methods. This paper also focuses on these two aspects of research work. 1. The probability model of equivalent ductility strength reduction coefficient R is given after a certain number of distant near field records are used to analyze a large number of single-degree-of-freedom structures. The strength reduction model takes into account the effects of displacement ductility, site soil type, distance, near-field earthquakes and so on. The structural strength requirements obtained from near field seismic records are unified in a single mathematical model. 2. The correlation analysis between several strength indexes and the energy demand of the structure under near-field earthquake is carried out, and the optimal strength index IA (correlation degree is the highest) is obtained. Assuming that the amplitude of hysteretic deformation of the structure under reciprocating earthquake is equal, the maximum number of hysteretic loops (neq) that the structure can withstand under the same amplitude is estimated. The relationship between the two parameters (the strength index IA and the strength reduction coefficient R) is established, and the regression model is obtained by statistical analysis. On this basis, the hysteretic energy dissipation model and the total input energy model are derived. In order to compare the elastic input energy with the inelastic input energy, the energy reduction coefficient RE is introduced to consider this difference. Based on the theoretical background of pushover method, it is considered that the accuracy of target displacement estimation is the key to evaluate the seismic performance of structures accurately by pushover method. In this paper, the target displacement of the structure is estimated from the point of view of energy; the interstory shear magnification factor is introduced to reflect the horizontal force distribution of the structure; finally, on the basis of adaptive pushover analysis, A pushover analysis method based on hysteretic energy dissipation is proposed. In addition, the displacement-based seismic design under two displacement-demand spectra is compared with the capacity spectrum method. Finally, the pushover analysis method proposed in this paper is used to evaluate the seismic performance of the frame structure. 4. Based on the principle of energy balance, the relationship between external input energy and internal energy consumption is established, and the design flow based on energy is established. The inelastic input energy, structural hysteretic model and far-field and near-field seismic records are also taken into account in the design process. Finally, the design examples of single degree of freedom structure (pier) and multi-degree of freedom structure are given, and the practicability of the design method is verified. The damage index model of the structure is derived, and the damage assessment (vulnerability curve) is carried out according to the proposed damage model. The IA strength index, which has a high correlation with the hysteretic energy dissipation of the structure, is selected as the transverse coordinate in the constructed vulnerability curve. In addition, after combining the results of the analysis of the similar frame structure, the vulnerability curve of the combination is given. Finally, the practicability of this method is verified by analyzing the vulnerability of a multi-layer frame structure.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TU352.11

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