本文選題：FRP抗震加固設計 + 數(shù)值分析�。� 參考：《東北大學》2013年博士論文

【摘要】：對既有結構進行抗震加固,是減輕地震災害、減少人民生命財產損失的有效手段。隨著纖維復合材料的發(fā)展,采用纖維增強塑料(fiber-reinforced polymer, FRP)對結構構件進行抗震加固引起土木工程人員的廣泛關注。然而,針對FRP加固結構而言,目前的抗震設計理論無法對不同地震作用下、不同加固預期目標給予針對性的FRP加固設計；沒有評價FRP加固結構抗震性能的標準和準確評估其抗震性能的有效方法。因此,給出一套完整的、適合FRP加固結構的抗震設計理論是非常有必要的�；谛阅艿慕Y構抗震設計理論是一種新概念的抗震設防理論,其核心思想是依據(jù)建筑物的重要程度,使所設計的建筑結構在遭受未來不同地震作用時具有預期的抗震能力和使用功能,該理論有系統(tǒng)評估普通混凝土結構抗震性能的方法,能夠準確評估結構的整體抗震性能。本文將基于性能的結構抗震設計思想引入FRP加固設計中,針對FRP加固鋼筋混凝土框架開展了相關研究。本文主要內容及結論有以下幾個方面：(1)從適用性、經濟可修性、安全性三個方面劃分了FRP加固柱、梁構件的性能水平。選取位移角作為性能指標,將顯著影響位移角的屬性因素引入到位移角的量化當中,給出基于性能的FRP加固構件性能水平的指標限值。在節(jié)點滿足構造要求的情況下,依據(jù)FRP加固混凝土構件柱、梁的性能水平,將FRP加固鋼筋混凝土框架的性能水平劃分為五個等級：正常使用、暫時使用、修復使用、生命安全及防止倒塌。(2)給出適用于FRP混凝土加固構件的塑性鉸模型。依據(jù)塑性鉸的轉角變形能力劃分其性能水平等級并給出相關表格。通過算例驗證了FRP混凝土加固構件塑性鉸模型應用于Etabs的可行性。算例結果表明,基于本文給出的塑性鉸模型所得到基底剪力、極限變形能力(頂點位移)比采用Etabs默認塑性鉸模型均有所提高。相同地震作用下采用本文給出的塑性鉸模型所得到的頂點位移和層間位移比默認塑性鉸模型均有所減小。(3)給出FRP加固混凝土柱、梁截面屈服前、后剛度以及FRP節(jié)點剪切剛度求解公式。依據(jù)現(xiàn)有試驗結果驗證了截面剛度公式的準確性。給出層間側向剛度與梁、柱、節(jié)點剛度的關系式。將目標層間側向剛度概念引入直接基于位移結構抗震設計中,利用層間側向剛度計算FRP加固量,可以定量地解決FRP加固混凝土構件的加固量問題。(4)針對FRP加固混凝土框架結構,提出了一種基于能力譜法考慮FRP加固混凝土構件耗能增量的抗震性能評估方法。該方法以FRP構件耗能增量對結構整體等效阻尼比的影響為依據(jù),修正了FRP加固混凝土框架的等效阻尼比。基于該等效阻尼比,能夠更加真實的反映FRP加固混凝土框架結構的抗震性能。
[Abstract]:Seismic reinforcement of existing structures is an effective means to reduce earthquake disasters and reduce the loss of people's lives and property. With the development of fiber composite materials, the application of fiber reinforced plastic fiber reinforced polymer (FRPP) to the seismic strengthening of structural members has attracted widespread attention of civil engineers. However, for the FRP reinforced structures, the current seismic design theory can not be targeted to different reinforcement targets of FRP reinforcement design under different earthquake. There is no standard to evaluate the seismic performance of FRP strengthened structures and an effective method to evaluate its seismic performance accurately. Therefore, it is necessary to give a complete set of seismic design theory suitable for FRP reinforced structure. The performance-based seismic design theory of structures is a new concept of seismic fortification theory, whose core idea is based on the importance of buildings. The designed building structure has the expected seismic capacity and function when it is subjected to different earthquake in the future. The theory has a systematic method to evaluate the seismic performance of ordinary concrete structure and can accurately evaluate the overall seismic performance of the structure. In this paper, the performance-based seismic design of structures is introduced into the design of FRP reinforcement, and the relevant research on reinforced concrete frames strengthened by FRP is carried out. The main contents and conclusions of this paper are as follows: 1) the performance level of FRP strengthened columns and beam members is divided from three aspects: applicability, economic repairable and safety. The displacement angle is selected as the performance index, and the attribute factors which affect the displacement angle are introduced into the quantization of the displacement angle, and the index limit of the performance level of the FRP strengthened member based on the performance is given. Under the condition that the joints meet the construction requirements, according to the performance level of FRP reinforced concrete members and beams, the performance level of reinforced concrete frame strengthened by FRP is divided into five levels: normal use, temporary use, repair use. A plastic hinge model for FRP reinforced concrete members is presented. According to the angle deformation ability of plastic hinge, the performance level is classified and the relevant tables are given. The feasibility of applying the plastic hinge model of FRP reinforced concrete member to Etabs is verified by an example. The numerical results show that the ultimate deformation capacity (vertex displacement) based on the plastic hinge model presented in this paper is higher than that of the Etabs default plastic hinge model. Under the same earthquake action, the vertex displacement and the interstory displacement obtained by the plastic hinge model given in this paper are smaller than those of the default plastic hinge model. After stiffness and FRP joint shear stiffness formula. The accuracy of the cross-section stiffness formula is verified by the existing experimental results. The relationship between the lateral stiffness and the stiffness of beams, columns and joints is given. The concept of lateral stiffness of target floors is introduced into the seismic design of displacement-based structures directly, and the reinforcement quantity of FRP can be quantitatively solved by using interstory lateral stiffness to solve the problem of reinforcement quantity of concrete members strengthened by FRP. A method for evaluating seismic performance of concrete members strengthened with FRP based on capacity spectrum method is presented. This method is based on the effect of the energy dissipation increment of FRP members on the overall equivalent damping ratio of the structure, and modifies the equivalent damping ratio of the concrete frame strengthened by FRP. Based on the equivalent damping ratio, the seismic behavior of concrete frame structure strengthened by FRP can be more truly reflected.
【學位授予單位】：東北大學
【學位級別】：博士
【學位授予年份】：2013
【分類號】：TU375.4;TU352.11

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